Mercurial > gemma

annotate pkg/mesh/strtree.go @ 5680:a87900c0fd11 sr-v2

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Remove triangles that are not registered in the spatial index.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sun, 11 Feb 2024 18:40:37 +0100
parents d56e043bbbca
children 33499bd1b829
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2512
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2018 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
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14 package mesh
2512
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15
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16 import (
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17 "math"
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18 "sort"
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19 )
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20
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21 // STRTreeDefaultEntries is the default number of children per node and leaf.
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22 const STRTreeDefaultEntries = 8
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23
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24 // STRTree is a Sort Tile Recurse tree.
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25 type STRTree struct {
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26 // Entries is the total number of entries.
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27 Entries int
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28 // tin is a reference to the TIN this tree is build from.
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29 tin *Tin
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30 // index is the internal tree representation.
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31 index []int32
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32 // bboxes are the bounding boxes used in nodes and leaves.
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33 bboxes []Box2D
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34 }
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35
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36 // Vertical does a vertical cross cut from (x1, y1) to (x2, y2).
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37 func (s *STRTree) Vertical(x1, y1, x2, y2 float64, fn func(*Triangle)) {
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38 box := Box2D{
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39 X1: math.Min(x1, x2),
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40 Y1: math.Min(y1, y2),
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41 X2: math.Max(x1, x2),
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42 Y2: math.Max(y1, y2),
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43 }
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44
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45 // out of bounding box
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46 if box.X2 < s.tin.Min.X || s.tin.Max.X < box.X1 ||
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47 box.Y2 < s.tin.Min.Y || s.tin.Max.Y < box.Y1 {
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48 return
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49 }
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50
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51 line := NewPlane2D(x1, y1, x2, y2)
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52
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53 vertices := s.tin.Vertices
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54
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55 stack := []int32{s.index[0]}
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56
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57 for len(stack) > 0 {
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58 top := stack[len(stack)-1]
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59 stack = stack[:len(stack)-1]
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60
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61 if top > 0 { // node
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62 if b := s.bbox(top); b.Intersects(box) && b.IntersectsPlane(line) {
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63 n := s.index[top+1]
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64 stack = append(stack, s.index[top+2:top+2+n]...)
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65 }
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66 } else { // leaf
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67 top = -top - 1
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68 if b := s.bbox(top); !b.Intersects(box) || !b.IntersectsPlane(line) {
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69 continue
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70 }
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71 n := s.index[top+1]
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72 for _, idx := range s.index[top+2 : top+2+n] {
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73 ti := s.tin.Triangles[idx]
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74 t := Triangle{
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75 vertices[ti[0]],
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76 vertices[ti[1]],
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77 vertices[ti[2]],
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78 }
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79 v0 := line.Eval(t[0].X, t[0].Y)
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80 v1 := line.Eval(t[1].X, t[1].Y)
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81 v2 := line.Eval(t[2].X, t[2].Y)
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82
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83 if onPlane(v0) || onPlane(v1) || onPlane(v2) ||
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84 sides(sides(sides(0, v0), v1), v2) == 3 {
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85 fn(&t)
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86 }
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87 }
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88 }
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89 }
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90 }
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91
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92 // Min return the minimum vertex of the TIN this tree is build from.
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93 func (s *STRTree) Min() Vertex { return s.tin.Min }
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94
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95 // Max return the maximum vertex of the TIN this tree is build from.
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96 func (s *STRTree) Max() Vertex { return s.tin.Max }
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97
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98 // EPSG return the EPSF code of the TIN this tree is build from.
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99 func (s *STRTree) EPSG() uint32 { return s.tin.EPSG }
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100
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101 // Value returns the Z Value for a given X/Y point.
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102 // Second return value is false if the point is out of bound.
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103 func (s *STRTree) Value(x, y float64) (float64, bool) {
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104
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105 if len(s.index) == 0 {
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106 return 0, false
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107 }
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108
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109 stack := []int32{s.index[0]}
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110
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111 vertices := s.tin.Vertices
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112
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113 for len(stack) > 0 {
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114 top := stack[len(stack)-1]
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115 stack = stack[:len(stack)-1]
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116
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117 if top > 0 { // node
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118 if s.bbox(top).Contains(x, y) {
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119 n := s.index[top+1]
5ef04ae34872 Used STRTree for caluculating the diff.
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parents: 4592
diff changeset
120 stack = append(stack, s.index[top+2:top+2+n]...)
5ef04ae34872 Used STRTree for caluculating the diff.
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parents: 4592
diff changeset
121 }
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
122 } else { // leaf
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
123 top = -top - 1
4645
946689a56fc2 Forgot a bbox check when evaluating STRTree speeding it significantly.
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parents: 4643
diff changeset
124 if !s.bbox(top).Contains(x, y) {
946689a56fc2 Forgot a bbox check when evaluating STRTree speeding it significantly.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4643
diff changeset
125 continue
946689a56fc2 Forgot a bbox check when evaluating STRTree speeding it significantly.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4643
diff changeset
126 }
4658
4bbfe3dd2ab5 Completed usage of STRTrees.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4654
diff changeset
127 n := s.index[top+1]
4bbfe3dd2ab5 Completed usage of STRTrees.
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parents: 4654
diff changeset
128 for _, idx := range s.index[top+2 : top+2+n] {
4641
5ef04ae34872 Used STRTree for caluculating the diff.
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diff changeset
129 ti := s.tin.Triangles[idx]
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
130 t := Triangle{
5ef04ae34872 Used STRTree for caluculating the diff.
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parents: 4592
diff changeset
131 vertices[ti[0]],
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
132 vertices[ti[1]],
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
133 vertices[ti[2]],
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
134 }
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
135 if t.Contains(x, y) {
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
136 return t.Plane3D().Z(x, y), true
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
137 }
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
138 }
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
139 }
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
140 }
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
141 return 0, false
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
142 }
5ef04ae34872 Used STRTree for caluculating the diff.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4592
diff changeset
143
4855
01b593ea2311 Added missing doc strings for the STR tree in the mesh package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4827
diff changeset
144 // Build builds a tree for a given TIN.
2516
1ec4c5633eb6 Clip STR tree and not Octree.
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parents: 2515
diff changeset
145 func (s *STRTree) Build(t *Tin) {
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
146
4591
f456ce0a6a0e STRTree: Made number of entries per node a parameter.
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parents: 2565
diff changeset
147 if s.Entries == 0 {
f456ce0a6a0e STRTree: Made number of entries per node a parameter.
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parents: 2565
diff changeset
148 s.Entries = STRTreeDefaultEntries
f456ce0a6a0e STRTree: Made number of entries per node a parameter.
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parents: 2565
diff changeset
149 }
f456ce0a6a0e STRTree: Made number of entries per node a parameter.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2565
diff changeset
150
2516
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
151 s.tin = t
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
152
2516
1ec4c5633eb6 Clip STR tree and not Octree.
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parents: 2515
diff changeset
153 all := make([]int32, len(t.Triangles))
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
154
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
155 for i := range all {
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
156 all[i] = int32(i)
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
157 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
158
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
159 s.index = append(s.index, 0)
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
160
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
161 root := s.build(all)
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
162
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
163 s.index[0] = root
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
164 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
165
4855
01b593ea2311 Added missing doc strings for the STR tree in the mesh package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4827
diff changeset
166 // BuildWithout builds a tree for a given TIN ignoring the triangles
01b593ea2311 Added missing doc strings for the STR tree in the mesh package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4827
diff changeset
167 // with the indices given in the remove map.
4592
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
168 func (s *STRTree) BuildWithout(t *Tin, remove map[int32]struct{}) {
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
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parents: 4591
diff changeset
169
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
170 if s.Entries == 0 {
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
171 s.Entries = STRTreeDefaultEntries
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
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parents: 4591
diff changeset
172 }
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
173
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
174 s.tin = t
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
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parents: 4591
diff changeset
175
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
176 all := make([]int32, 0, len(t.Triangles)-len(remove))
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
177
4642
b5d9647c5bc1 Fixed construction of clipped STRTree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4641
diff changeset
178 for i := 0; i < len(t.Triangles); i++ {
4592
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
179 idx := int32(i)
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
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parents: 4591
diff changeset
180 if _, found := remove[idx]; !found {
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
181 all = append(all, idx)
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
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parents: 4591
diff changeset
182 }
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
183 }
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
184
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
185 s.index = append(s.index, 0)
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
186
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
187 root := s.build(all)
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
188
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
189 s.index[0] = root
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
190 }
680f1d8802f0 STRTree: Add a builder that ignores triangles which are filtered out before.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4591
diff changeset
191
4855
01b593ea2311 Added missing doc strings for the STR tree in the mesh package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4827
diff changeset
192 // Clip returns the indices of the triangles of the TIN
01b593ea2311 Added missing doc strings for the STR tree in the mesh package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4827
diff changeset
193 // which are not fully covered by the given polygon.
2516
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
194 func (s *STRTree) Clip(p *Polygon) map[int32]struct{} {
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
195
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
196 removed := make(map[int32]struct{})
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
197
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
198 stack := []int32{s.index[0]}
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
199
2521
e26000628764 Clip triangle in STR tree leaves correctly.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2516
diff changeset
200 vertices := s.tin.Vertices
e26000628764 Clip triangle in STR tree leaves correctly.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2516
diff changeset
201
2516
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
202 for len(stack) > 0 {
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
203 top := stack[len(stack)-1]
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
204 stack = stack[:len(stack)-1]
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
205
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
206 if top > 0 { // node
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
207 switch p.IntersectionBox2D(s.bbox(top)) {
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
208 case IntersectionInside:
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
209 // all triangles are inside polygon
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
210 case IntersectionOutSide:
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
211 // all triangles are outside polygon
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
212 s.allTriangles(top, removed)
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
213 default:
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
214 // mixed bag
4643
a1a9b1eab57c Use append/slicing trick to simplify tree traversals.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4642
diff changeset
215 n := s.index[top+1]
a1a9b1eab57c Use append/slicing trick to simplify tree traversals.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4642
diff changeset
216 stack = append(stack, s.index[top+2:top+2+n]...)
2516
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
217 }
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
218 } else { // leaf
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
219 top = -top - 1
4703
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
220 switch p.IntersectionBox2D(s.bbox(top)) {
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
221 case IntersectionInside:
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
222 // all triangles are inside polygon
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
223 case IntersectionOutSide:
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
224 // all triangles are outside polygon
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
225 n := s.index[top+1]
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
226 for _, idx := range s.index[top+2 : top+2+n] {
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
227 removed[idx] = struct{}{}
2521
e26000628764 Clip triangle in STR tree leaves correctly.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2516
diff changeset
228 }
4703
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
229 default:
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
230 n := s.index[top+1]
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
231 for _, idx := range s.index[top+2 : top+2+n] {
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
232 ti := s.tin.Triangles[idx]
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
233 t := Triangle{
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
234 vertices[ti[0]],
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
235 vertices[ti[1]],
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
236 vertices[ti[2]],
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
237 }
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
238 if p.IntersectionWithTriangle(&t) != IntersectionInside {
6e179b338f1a STRTree: Improve usage of bounding boxes in leaves of the tree. Speeds stuff 10x up.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4658
diff changeset
239 removed[idx] = struct{}{}
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parents: 4658
diff changeset
240 }
2521
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parents: 2516
diff changeset
241 }
2516
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242 }
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parents: 2515
diff changeset
243 }
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parents: 2515
diff changeset
244 }
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parents: 2515
diff changeset
245
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diff changeset
246 return removed
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247 }
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248
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diff changeset
249 func (s *STRTree) allTriangles(pos int32, tris map[int32]struct{}) {
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diff changeset
250 stack := []int32{pos}
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parents: 2515
diff changeset
251 for len(stack) > 0 {
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parents: 2515
diff changeset
252 top := stack[len(stack)-1]
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253 stack = stack[:len(stack)-1]
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parents: 2515
diff changeset
254 if top > 0 { // node
4643
a1a9b1eab57c Use append/slicing trick to simplify tree traversals.
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parents: 4642
diff changeset
255 n := s.index[top+1]
a1a9b1eab57c Use append/slicing trick to simplify tree traversals.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4642
diff changeset
256 stack = append(stack, s.index[top+2:top+2+n]...)
2516
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parents: 2515
diff changeset
257 } else { // leaf
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parents: 2515
diff changeset
258 top = -top - 1
4704
9eb708176b43 STRTree: more efficent usage of slicing in collecting triangles during clipping.
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parents: 4703
diff changeset
259 n := s.index[top+1]
9eb708176b43 STRTree: more efficent usage of slicing in collecting triangles during clipping.
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parents: 4703
diff changeset
260 for _, idx := range s.index[top+2 : top+2+n] {
9eb708176b43 STRTree: more efficent usage of slicing in collecting triangles during clipping.
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parents: 4703
diff changeset
261 tris[idx] = struct{}{}
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262 }
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parents: 2515
diff changeset
263 }
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parents: 2515
diff changeset
264 }
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parents: 2515
diff changeset
265 }
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266
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parents:
diff changeset
267 func (s *STRTree) build(items []int32) int32 {
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
268 sort.Slice(items, func(i, j int) bool {
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diff changeset
269 ti := s.tin.Triangles[items[i]]
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diff changeset
270 tj := s.tin.Triangles[items[j]]
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271 return s.tin.Vertices[ti[0]].X < s.tin.Vertices[tj[0]].X
2512
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parents:
diff changeset
272 })
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
273
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diff changeset
274 P := int(math.Ceil(float64(len(items)) / float64(s.Entries)))
2512
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parents:
diff changeset
275 S := int(math.Ceil(math.Sqrt(float64(P))))
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parents:
diff changeset
276
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diff changeset
277 slices := s.strSplit(items, S)
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2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
278
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f456ce0a6a0e STRTree: Made number of entries per node a parameter.
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diff changeset
279 leaves := s.strJoin(
2565
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parents: 2564
diff changeset
280 slices, S,
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parents: 2564
diff changeset
281 func(i, j int32) bool {
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diff changeset
282 ti := s.tin.Triangles[i]
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diff changeset
283 tj := s.tin.Triangles[j]
2516
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diff changeset
284 return s.tin.Vertices[ti[0]].Y < s.tin.Vertices[tj[0]].Y
2565
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diff changeset
285 },
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parents: 2564
diff changeset
286 s.allocLeaf,
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parents: 2564
diff changeset
287 )
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
288
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
289 return s.buildNodes(leaves)
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parents:
diff changeset
290 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
291
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
292 func (s *STRTree) buildNodes(items []int32) int32 {
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
293
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diff changeset
294 if len(items) <= s.Entries {
2512
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parents:
diff changeset
295 return s.allocNode(items)
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
296 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
297
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
298 sort.Slice(items, func(i, j int) bool {
2515
6bcaa8bf2603 STR tree: Fixed sorting. Stored num items per nodes. Simpified code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2513
diff changeset
299 return s.bbox(items[i]).X1 < s.bbox(items[j]).X1
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
300 })
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
301
4591
f456ce0a6a0e STRTree: Made number of entries per node a parameter.
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parents: 2565
diff changeset
302 P := int(math.Ceil(float64(len(items)) / float64(s.Entries)))
2512
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parents:
diff changeset
303 S := int(math.Ceil(math.Sqrt(float64(P))))
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
304
4591
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diff changeset
305 slices := s.strSplit(items, S)
2512
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parents:
diff changeset
306
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parents: 2565
diff changeset
307 nodes := s.strJoin(
2565
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diff changeset
308 slices, S,
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parents: 2564
diff changeset
309 func(i, j int32) bool { return s.bbox(i).Y1 < s.bbox(j).Y1 },
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parents: 2564
diff changeset
310 s.allocNode,
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
311 )
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parents: 2564
diff changeset
312
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
313 return s.buildNodes(nodes)
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
314 }
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
315
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
316 func (s *STRTree) bbox(idx int32) Box2D {
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
317 if idx < 0 { // Don't care if leaf or node.
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
318 idx = -idx - 1
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2564
diff changeset
319 }
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
320 return s.bboxes[s.index[idx]]
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parents: 2564
diff changeset
321 }
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parents: 2564
diff changeset
322
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f456ce0a6a0e STRTree: Made number of entries per node a parameter.
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parents: 2565
diff changeset
323 func (s *STRTree) strSplit(items []int32, S int) [][]int32 {
f456ce0a6a0e STRTree: Made number of entries per node a parameter.
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parents: 2565
diff changeset
324 sm := S * s.Entries
2565
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parents: 2564
diff changeset
325 slices := make([][]int32, S)
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
326 for i := range slices {
114979e97a6c STR tree: More code simplification.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2564
diff changeset
327 var n int
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
328 if l := len(items); l < sm {
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
329 n = l
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parents: 2564
diff changeset
330 } else {
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
331 n = sm
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
332 }
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
333 slices[i] = items[:n]
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parents: 2564
diff changeset
334 items = items[n:]
114979e97a6c STR tree: More code simplification.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2564
diff changeset
335 }
114979e97a6c STR tree: More code simplification.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2564
diff changeset
336 return slices
114979e97a6c STR tree: More code simplification.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2564
diff changeset
337 }
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
338
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parents: 2565
diff changeset
339 func (s *STRTree) strJoin(
2565
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parents: 2564
diff changeset
340 slices [][]int32, S int,
114979e97a6c STR tree: More code simplification.
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parents: 2564
diff changeset
341 less func(int32, int32) bool,
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parents: 2564
diff changeset
342 alloc func([]int32) int32,
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parents: 2564
diff changeset
343 ) []int32 {
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
344 nodes := make([]int32, 0, S*S)
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
345
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
346 for _, slice := range slices {
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
347 sort.Slice(slice, func(i, j int) bool {
2565
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parents: 2564
diff changeset
348 return less(slice[i], slice[j])
2512
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
349 })
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
350
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
351 for len(slice) > 0 {
2565
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parents: 2564
diff changeset
352 var n int
4591
f456ce0a6a0e STRTree: Made number of entries per node a parameter.
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parents: 2565
diff changeset
353 if l := len(slice); l >= s.Entries {
f456ce0a6a0e STRTree: Made number of entries per node a parameter.
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parents: 2565
diff changeset
354 n = s.Entries
2565
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parents: 2564
diff changeset
355 } else {
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
356 n = l
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
357 }
2565
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parents: 2564
diff changeset
358 nodes = append(nodes, alloc(slice[:n]))
2512
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parents:
diff changeset
359 slice = slice[n:]
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
360 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
361 }
2565
114979e97a6c STR tree: More code simplification.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2564
diff changeset
362 return nodes
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
363 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
364
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
365 func (s *STRTree) allocNode(items []int32) int32 {
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
366 pos := len(s.index)
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6bcaa8bf2603 STR tree: Fixed sorting. Stored num items per nodes. Simpified code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2513
diff changeset
367 s.index = append(s.index, 0, int32(len(items)))
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
368 s.index = append(s.index, items...)
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
369 if len(items) > 0 {
2515
6bcaa8bf2603 STR tree: Fixed sorting. Stored num items per nodes. Simpified code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2513
diff changeset
370 box := s.bbox(items[0])
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
371 for i := 1; i < len(items); i++ {
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6bcaa8bf2603 STR tree: Fixed sorting. Stored num items per nodes. Simpified code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2513
diff changeset
372 box = box.Union(s.bbox(items[i]))
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
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parents:
diff changeset
373 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
374 s.index[pos] = int32(s.allocBBox(box))
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
375 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
376 return int32(pos)
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
377 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
378
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
379 func (s *STRTree) allocBBox(box Box2D) int {
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
380 pos := len(s.bboxes)
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
381 s.bboxes = append(s.bboxes, box)
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
382 return pos
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
383 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
384
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
385 func (s *STRTree) allocLeaf(items []int32) int32 {
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
386 pos := len(s.index)
2515
6bcaa8bf2603 STR tree: Fixed sorting. Stored num items per nodes. Simpified code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2513
diff changeset
387 s.index = append(s.index, 0, int32(len(items)))
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
388 s.index = append(s.index, items...)
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
389 if len(items) > 0 {
2516
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
390 vertices := s.tin.Vertices
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
391 ti := s.tin.Triangles[items[0]]
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
392 t := Triangle{
2515
6bcaa8bf2603 STR tree: Fixed sorting. Stored num items per nodes. Simpified code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2513
diff changeset
393 vertices[ti[0]],
6bcaa8bf2603 STR tree: Fixed sorting. Stored num items per nodes. Simpified code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2513
diff changeset
394 vertices[ti[1]],
6bcaa8bf2603 STR tree: Fixed sorting. Stored num items per nodes. Simpified code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2513
diff changeset
395 vertices[ti[2]],
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
396 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
397 box := t.BBox()
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
398 for i := 1; i < len(items); i++ {
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
399 it := items[i]
2516
1ec4c5633eb6 Clip STR tree and not Octree.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2515
diff changeset
400 ti := s.tin.Triangles[it]
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
401 t := Triangle{
2515
6bcaa8bf2603 STR tree: Fixed sorting. Stored num items per nodes. Simpified code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2513
diff changeset
402 vertices[ti[0]],
6bcaa8bf2603 STR tree: Fixed sorting. Stored num items per nodes. Simpified code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2513
diff changeset
403 vertices[ti[1]],
6bcaa8bf2603 STR tree: Fixed sorting. Stored num items per nodes. Simpified code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2513
diff changeset
404 vertices[ti[2]],
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
405 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
406 box = box.Union(t.BBox())
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
407 }
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
408 s.index[pos] = int32(s.allocBBox(box))
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
409 }
2515
6bcaa8bf2603 STR tree: Fixed sorting. Stored num items per nodes. Simpified code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2513
diff changeset
410 return int32(-(pos + 1))
2512
2768f74d54ab Added an STRTree for the triangulation. Should be better suited for filtering out the clipped triangles.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
411 }
5680
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
412
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
413 // allTriangleIndices passes all triangle indices to callback fn.
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
414 func (s *STRTree) allTriangleIndices(fn func([]int32)) {
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
415 stack := []int32{s.index[0]}
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
416 for len(stack) > 0 {
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
417 top := stack[len(stack)-1]
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
418 stack = stack[:len(stack)-1]
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
419 if top > 0 { // node
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
420 n := s.index[top+1]
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
421 stack = append(stack, s.index[top+2:top+2+n]...)
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
422 } else { // leaf
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
423 top = -top - 1
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
424 n := s.index[top+1]
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
425 fn(s.index[top+2 : top+2+n])
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
426 }
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
427 }
a87900c0fd11 Remove triangles that are not registered in the spatial index.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 5676
diff changeset
428 }