Mercurial > gemma
view pkg/wkb/data.go @ 4488:bff6c5c1db4f
client: pdf-gen: improve adding bottleneck info to pdf
* Check if the bottleneck is in the current view to add its info to the exported pdf and the pdf filename, this avoid wrong filename and wrong info in pdf in case view has been changed to another location.
* Set the bottleneck to print after moving to it in map.
author | Fadi Abbud <fadi.abbud@intevation.de> |
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date | Fri, 27 Sep 2019 11:15:02 +0200 |
parents | 98497ac4af3c |
children | 0ddb308fed37 |
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// This is Free Software under GNU Affero General Public License v >= 3.0 // without warranty, see README.md and license for details. // // SPDX-License-Identifier: AGPL-3.0-or-later // License-Filename: LICENSES/AGPL-3.0.txt // // Copyright (C) 2019 by via donau // – Österreichische Wasserstraßen-Gesellschaft mbH // Software engineering by Intevation GmbH // // Author(s): // * Sascha L. Teichmann <sascha.teichmann@intevation.de> package wkb import ( "bytes" "encoding/binary" "fmt" "math" ) type ( PointGeom struct { X float64 Y float64 } LinearRingGeom []PointGeom PolygonGeom []LinearRingGeom MultiPolygonGeom []PolygonGeom ) func (mpg MultiPolygonGeom) AsWKB() []byte { size := 1 + 4 + 4 for _, pg := range mpg { size += 1 + 4 + 4 for _, r := range pg { size += 4 + 2*8*len(r) } } buf := bytes.NewBuffer(make([]byte, 0, size)) binary.Write(buf, binary.LittleEndian, NDR) binary.Write(buf, binary.LittleEndian, MultiPolygon) binary.Write(buf, binary.LittleEndian, uint32(len(mpg))) for _, pg := range mpg { binary.Write(buf, binary.LittleEndian, NDR) binary.Write(buf, binary.LittleEndian, Polygon) binary.Write(buf, binary.LittleEndian, uint32(len(pg))) for _, r := range pg { binary.Write(buf, binary.LittleEndian, uint32(len(r))) for _, p := range r { x := math.Float64bits(p.X) y := math.Float64bits(p.Y) binary.Write(buf, binary.LittleEndian, x) binary.Write(buf, binary.LittleEndian, y) } } } return buf.Bytes() } func (mpg *MultiPolygonGeom) FromWKB(data []byte) error { r := bytes.NewReader(data) var order binary.ByteOrder switch endian, err := r.ReadByte(); { case err != nil: return err case endian == NDR: order = binary.LittleEndian case endian == XDR: order = binary.BigEndian default: return fmt.Errorf("unknown byte order %x", endian) } var geomType uint32 switch err := binary.Read(r, order, &geomType); { case err != nil: return err case geomType != MultiPolygon: return fmt.Errorf("unknown geometry type %x", geomType) } var numPolygons uint32 if err := binary.Read(r, order, &numPolygons); err != nil { return err } polygons := make([]PolygonGeom, numPolygons) for i := range polygons { switch endian, err := r.ReadByte(); { case err != nil: return err case endian == NDR: order = binary.LittleEndian case endian == XDR: order = binary.BigEndian default: return fmt.Errorf("unknown byte order %x", endian) } switch err := binary.Read(r, order, &geomType); { case err != nil: return err case geomType != Polygon: return fmt.Errorf("unknown geometry type %x", geomType) } var numRings uint32 if err := binary.Read(r, order, &numRings); err != nil { return err } rings := make([]LinearRingGeom, numRings) for j := range rings { var numPoints uint32 if err := binary.Read(r, order, &numPoints); err != nil { return err } points := make([]PointGeom, numPoints) for k := range points { var x, y uint64 if err := binary.Read(r, order, &x); err != nil { return err } if err := binary.Read(r, order, &y); err != nil { return err } points[k] = PointGeom{ X: math.Float64frombits(x), Y: math.Float64frombits(y), } } rings[j] = points } polygons[i] = rings } *mpg = polygons return nil } func (lr LinearRingGeom) CCW() bool { var sum float64 for i, v1 := range lr { v2 := lr[(i+1)%len(lr)] sum += (v2.X - v1.X) * (v2.Y + v1.Y) } return sum > 0 }