gemma: pkg/octree/polygon.go annotate

annotate pkg/octree/polygon.go @ 2549:9bf6b767a56a

client: refactored and improved splitscreen for diagrams To make different diagrams possible, the splitscreen view needed to be decoupled from the cross profiles. Also the style has changed to make it more consistent with the rest of the app. The standard box header is now used and there are collapse and expand animations.

author	Markus Kottlaender <markus@intevation.de>
date	Fri, 08 Mar 2019 08:50:47 +0100
parents	843f39b9327e
children	2833ff156cb2

rev	line source
2488 cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	1 // This is Free Software under GNU Affero General Public License v >= 3.0
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	2 // without warranty, see README.md and license for details.
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	3 //
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	4 // SPDX-License-Identifier: AGPL-3.0-or-later
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	5 // License-Filename: LICENSES/AGPL-3.0.txt
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	6 //
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	7 // Copyright (C) 2018 by via donau
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	8 // – Österreichische Wasserstraßen-Gesellschaft mbH
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	9 // Software engineering by Intevation GmbH
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	10 //
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	11 // Author(s):
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	13
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	14 package octree
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	15
2489 4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	16 import (
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	17 "bytes"
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	18 "encoding/binary"
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	19 "fmt"
2498 843f39b9327e Handle hole more precisely. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2495 diff changeset	20 "log"
2489 4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	21 "math"
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	22
2492 10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	23 "github.com/tidwall/rtree"
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	24
2489 4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	25 "gemma.intevation.de/gemma/pkg/wkb"
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	26 )
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	27
2492 10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	28 type (
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	29 ring []float64
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	30
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	31 Polygon struct {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	32 // TODO: Implement me!
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	33 rings []ring
2490 c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	34
2492 10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	35 indices []*rtree.RTree
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	36 }
2488 cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	37
2492 10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	38 IntersectionType byte
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	39
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	40 lineSegment []float64
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	41 )
2488 cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	42
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	43 const (
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	44 IntersectionInside IntersectionType = iota
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	45 IntersectionOutSide
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	46 IntersectionOverlaps
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	47 )
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	48
2492 10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	49 func (ls lineSegment) Rect(interface{}) ([]float64, []float64) {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	50
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	51 var min, max [2]float64
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	52
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	53 if ls[0] < ls[2] {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	54 min[0] = ls[0]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	55 max[0] = ls[2]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	56 } else {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	57 min[0] = ls[2]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	58 max[0] = ls[0]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	59 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	60
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	61 if ls[1] < ls[3] {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	62 min[1] = ls[1]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	63 max[1] = ls[3]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	64 } else {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	65 min[1] = ls[3]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	66 max[1] = ls[1]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	67 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	68
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	69 return min[:], max[:]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	70 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	71
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	72 func (p *Polygon) Indexify() {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	73 indices := make([]*rtree.RTree, len(p.rings))
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	74
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	75 for i := range indices {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	76 index := rtree.New(nil)
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	77 indices[i] = index
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	78
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	79 rng := p.rings[i]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	80
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	81 for i := 0; i < len(rng); i += 2 {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	82 var ls lineSegment
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	83 if i+4 <= len(rng) {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	84 ls = lineSegment(rng[i : i+4])
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	85 } else {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	86 ls = []float64{rng[i], rng[i+1], rng[0], rng[1]}
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	87 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	88 index.Insert(ls)
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	89 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	90 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	91
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	92 p.indices = indices
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	93 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	94
2494 a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	95 func (ls lineSegment) intersects(a Box2D) bool {
2492 10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	96 p1x := ls[0]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	97 p1y := ls[1]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	98 p2x := ls[2]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	99 p2y := ls[3]
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	100
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	101 left := a.X1
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	102 right := a.X2
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	103 top := a.Y1
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	104 bottom := a.Y2
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	105
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	106 // The direction of the ray
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	107 dx := p2x - p1x
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	108 dy := p2y - p1y
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	109
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	110 min, max := 0.0, 1.0
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	111
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	112 var t0, t1 float64
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	113
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	114 // Left and right sides.
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	115 // - If the line is parallel to the y axis.
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	116 if dx == 0 {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	117 if p1x < left \|\| p1x > right {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	118 return false
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	119 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	120 } else {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	121 // - Make sure t0 holds the smaller value by checking the direction of the line.
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	122 if dx > 0 {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	123 t0 = (left - p1x) / dx
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	124 t1 = (right - p1x) / dx
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	125 } else {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	126 t1 = (left - p1x) / dx
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	127 t0 = (right - p1x) / dx
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	128 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	129
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	130 if t0 > min {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	131 min = t0
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	132 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	133 if t1 < max {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	134 max = t1
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	135 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	136 if min > max \|\| max < 0 {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	137 return false
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	138 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	139 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	140
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	141 // The top and bottom side.
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	142 // - If the line is parallel to the x axis.
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	143 if dy == 0 {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	144 if p1y < top \|\| p1y > bottom {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	145 return false
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	146 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	147 } else {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	148 // - Make sure t0 holds the smaller value by checking the direction of the line.
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	149 if dy > 0 {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	150 t0 = (top - p1y) / dy
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	151 t1 = (bottom - p1y) / dy
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	152 } else {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	153 t1 = (top - p1y) / dy
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	154 t0 = (bottom - p1y) / dy
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	155 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	156
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	157 if t0 > min {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	158 min = t0
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	159 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	160 if t1 < max {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	161 max = t1
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	162 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	163 if min > max \|\| max < 0 {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	164 return false
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	165 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	166 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	167
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	168 // The point of intersection
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	169 // ix = p1x + dx*min
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	170 // iy = p1y + dy*min
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	171 return true
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	172 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	173
2494 a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	174 func (ls lineSegment) intersectsLineSegment(o lineSegment) bool {
2495 98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	175
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	176 p0 := ls[:2]
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	177 p1 := ls[2:4]
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	178 p2 := o[:2]
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	179 p3 := o[2:4]
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	180
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	181 s10x := p1[0] - p0[0]
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	182 s10y := p1[1] - p0[1]
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	183 s32x := p3[0] - p2[0]
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	184 s32y := p3[1] - p2[1]
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	185
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	186 den := s10xs32y - s32xs10y
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	187
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	188 if den == 0 {
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	189 return false
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	190 }
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	191
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	192 denPos := den > 0
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	193
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	194 s02x := p0[0] - p2[0]
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	195 s02y := p0[1] - p2[1]
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	196
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	197 sNum := s10xs02y - s10ys02x
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	198 if sNum < 0 == denPos {
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	199 return false
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	200 }
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	201
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	202 tNum := s32xs02y - s32ys02x
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	203 if tNum < 0 == denPos {
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	204 return false
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	205 }
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	206
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	207 if sNum > den == denPos \|\| tNum > den == denPos {
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	208 return false
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	209 }
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	210
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	211 // t := tNum / den
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	212 // intersection at( p0[0] + (t * s10x), p0[1] + (t * s10y) )
98bc023750cf Impelemented line segment / line segment intersection test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2494 diff changeset	213 return true
2494 a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	214 }
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	215
2488 cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	216 func (p *Polygon) IntersectionBox2D(box Box2D) IntersectionType {
2492 10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	217
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	218 if len(p.rings) == 0 {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	219 return IntersectionOutSide
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	220 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	221
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	222 for _, index := range p.indices {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	223 var intersects bool
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	224 index.Search(box, func(item rtree.Item) bool {
2494 a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	225 if item.(lineSegment).intersects(box) {
2492 10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	226 intersects = true
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	227 return false
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	228 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	229 return true
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	230 })
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	231 if intersects {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	232 return IntersectionOverlaps
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	233 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	234 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	235
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	236 // No intersection -> check inside or outside
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	237 // if an abritrary point is inside or not.
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	238 point := []float64{box.X1, box.Y1}
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	239
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	240 // Check holes first: inside a hole means outside.
2498 843f39b9327e Handle hole more precisely. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2495 diff changeset	241 if len(p.rings) > 1 {
2492 10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	242 for _, hole := range p.rings[1:] {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	243 if hole.contains(point) {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	244 return IntersectionOutSide
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	245 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	246 }
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	247 }
2494 a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	248
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	249 // Check shell
2492 10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	250 if p.rings[0].contains(point) {
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	251 return IntersectionInside
10681749371d Implemented the BBox/clipping polygon test. TODO: triangle/clipping polygon test. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2490 diff changeset	252 }
2488 cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	253 return IntersectionOutSide
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	254 }
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	255
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	256 func (p Polygon) IntersectionWithTriangle(t Triangle) IntersectionType {
2494 a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	257 box := t.BBox()
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	258 for _, index := range p.indices {
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	259 var intersects bool
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	260 index.Search(box, func(item rtree.Item) bool {
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	261 ls := item.(lineSegment)
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	262 other := make(lineSegment, 4)
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	263 for i := range t {
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	264 other[0] = t[i].X
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	265 other[1] = t[i].Y
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	266 other[2] = t[(i+1)%len(t)].X
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	267 other[3] = t[(i+1)%len(t)].Y
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	268 if ls.intersectsLineSegment(other) {
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	269 intersects = true
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	270 return false
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	271 }
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	272 }
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	273 return true
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	274 })
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	275 if intersects {
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	276 return IntersectionOverlaps
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	277 }
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	278 }
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	279 // No intersection -> check inside or outside
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	280 // if an abritrary point is inside or not.
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	281 point := []float64{t[0].X, t[0].Y}
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	282
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	283 // Check holes first: inside a hole means outside.
2498 843f39b9327e Handle hole more precisely. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2495 diff changeset	284 if len(p.rings) > 1 {
2494 a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	285 for _, hole := range p.rings[1:] {
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	286 if hole.contains(point) {
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	287 return IntersectionOutSide
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	288 }
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	289 }
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	290 }
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	291
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	292 // Check shell
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	293 if p.rings[0].contains(point) {
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	294 return IntersectionInside
a727e0426240 More on triangle/clipping polygon intersection. TODO: line segment / line segment intersection. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2492 diff changeset	295 }
2488 cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	296 return IntersectionOutSide
cb55d7eaaa36 Started with the idea to clip an octree by an bounding polygon. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: diff changeset	297 }
2489 4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	298
2490 c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	299 func (rng ring) isClosed() bool { return (len(rng) / 2) >= 3 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	300
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	301 func (rng ring) contains(point []float64) bool {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	302 if !rng.isClosed() {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	303 return false
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	304 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	305
2498 843f39b9327e Handle hole more precisely. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2495 diff changeset	306 end := len(rng)/2 - 1
843f39b9327e Handle hole more precisely. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2495 diff changeset	307
843f39b9327e Handle hole more precisely. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2495 diff changeset	308 contains := intersectsWithRaycast(point, rng[:2], rng[end2:end2+2])
2490 c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	309
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	310 for i := 2; i < len(rng); i += 2 {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	311 if intersectsWithRaycast(point, rng[i-2:i], rng[i:i+2]) {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	312 contains = !contains
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	313 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	314 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	315
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	316 return contains
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	317 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	318
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	319 // Using the raycast algorithm, this returns whether or not the passed in point
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	320 // Intersects with the edge drawn by the passed in start and end points.
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	321 // Original implementation: http://rosettacode.org/wiki/Ray-casting_algorithm#Go
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	322 func intersectsWithRaycast(point, start, end []float64) bool {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	323
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	324 // Always ensure that the the first point
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	325 // has a y coordinate that is less than the second point
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	326 if start[1] > end[1] {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	327 // Switch the points if otherwise.
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	328 start, end = end, start
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	329 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	330
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	331 // Move the point's y coordinate
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	332 // outside of the bounds of the testing region
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	333 // so we can start drawing a ray
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	334 for point[1] == start[1] \|\| point[1] == end[1] {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	335 y := math.Nextafter(point[1], math.Inf(1))
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	336 point = []float64{point[0], y}
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	337 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	338
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	339 // If we are outside of the polygon, indicate so.
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	340 if point[1] < start[1] \|\| point[1] > end[1] {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	341 return false
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	342 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	343
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	344 if start[0] > end[0] {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	345 if point[0] > start[0] {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	346 return false
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	347 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	348 if point[0] < end[0] {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	349 return true
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	350 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	351 } else {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	352 if point[0] > end[0] {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	353 return false
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	354 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	355 if point[0] < start[0] {
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	356 return true
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	357 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	358 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	359
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	360 raySlope := (point[1] - start[1]) / (point[0] - start[0])
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	361 diagSlope := (end[1] - start[1]) / (end[0] - start[0])
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	362
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	363 return raySlope >= diagSlope
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	364 }
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	365
2489 4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	366 func (p *Polygon) FromWKB(data []byte) error {
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	367
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	368 r := bytes.NewReader(data)
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	369
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	370 endian, err := r.ReadByte()
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	371
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	372 var order binary.ByteOrder
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	373
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	374 switch {
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	375 case err != nil:
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	376 return err
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	377 case endian == wkb.NDR:
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	378 order = binary.LittleEndian
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	379 case endian == wkb.XDR:
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	380 order = binary.BigEndian
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	381 default:
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	382 return fmt.Errorf("unknown byte order %x", endian)
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	383 }
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	384
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	385 var geomType uint32
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	386 err = binary.Read(r, order, &geomType)
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	387
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	388 switch {
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	389 case err != nil:
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	390 return err
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	391 case geomType != wkb.Polygon:
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	392 return fmt.Errorf("unknown geometry type %x", geomType)
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	393 }
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	394
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	395 var numRings uint32
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	396 if err = binary.Read(r, order, &numRings); err != nil {
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	397 return err
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	398 }
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	399
2490 c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	400 rngs := make([]ring, numRings)
2489 4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	401
2498 843f39b9327e Handle hole more precisely. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2495 diff changeset	402 log.Printf("info: Number of rings: %d\n", len(rngs))
843f39b9327e Handle hole more precisely. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2495 diff changeset	403
2490 c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	404 for rng := uint32(0); rng < numRings; rng++ {
2489 4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	405 var numVertices uint32
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	406 if err = binary.Read(r, order, &numVertices); err != nil {
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	407 return err
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	408 }
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	409
2498 843f39b9327e Handle hole more precisely. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2495 diff changeset	410 log.Printf("info: Number of vertices in ring %d: %d\n", rng, numVertices)
843f39b9327e Handle hole more precisely. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2495 diff changeset	411
2490 c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	412 numVertices *= 2
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	413 vertices := make([]float64, numVertices)
2489 4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	414
2490 c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	415 for v := uint32(0); v < numVertices; v += 2 {
2489 4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	416 var lat, lon uint64
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	417 if err = binary.Read(r, order, &lat); err != nil {
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	418 return err
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	419 }
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	420 if err = binary.Read(r, order, &lon); err != nil {
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	421 return err
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	422 }
2490 c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	423 vertices[v] = math.Float64frombits(lat)
c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	424 vertices[v+1] = math.Float64frombits(lon)
2489 4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	425 }
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	426
2490 c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	427 rngs[rng] = vertices
2489 4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	428 }
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	429
2490 c9164ff98871 Started with point in polygon check. Sascha L. Teichmann <sascha.teichmann@intevation.de> parents: 2489 diff changeset	430 p.rings = rngs
2489 4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	431
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	432 return nil
4f292ff74d9e Added a WKB reader for clipping polygon. Sascha L. Teichmann <teichmann@intevation.de> parents: 2488 diff changeset	433 }

Mercurial > gemma

annotate pkg/octree/polygon.go @ 2549:9bf6b767a56a