Mercurial > gemma

annotate cmd/isoareas/main.go @ 4540:e01b6e7cbe7d iso-areas

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Detect isolated triangles as standalone areas.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 26 Sep 2019 13:08:56 +0200
parents 99928231b679
children 53b55f811666
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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) 2019 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 main
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15
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16 import (
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17 "bufio"
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18 "io"
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19 "log"
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20 "math"
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21 "math/bits"
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22 "os"
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23 "strconv"
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24 "strings"
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25 "time"
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26
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27 "gemma.intevation.de/gemma/pkg/octree"
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28 )
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29
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30 const classBreaks = `1:#ff00dd,1.5,1.7,1.9,2.1,2.3,2.5:#f25f20,2.7,2.9,3.1:#f7e40e,3.3,3.5,4:#8ad51a,4.5,5,5.5,6,6.5,7:#1414ff`
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31
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32 func loadXYZ(r io.Reader) (octree.MultiPointZ, error) {
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33
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34 scanner := bufio.NewScanner(r)
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35
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36 points := make(octree.MultiPointZ, 0, 2000000)
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37
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38 var x, y, z float64
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39 var err error
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40
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41 for scanner.Scan() {
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42 line := strings.TrimSpace(scanner.Text())
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43 if len(line) == 0 || strings.HasPrefix(line, "#") {
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44 continue
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45 }
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46 parts := strings.SplitN(line, " ", 3)
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47 if len(parts) != 3 {
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48 continue
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49 }
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50
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51 if x, err = strconv.ParseFloat(parts[0], 64); err != nil {
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52 return nil, err
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53 }
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54 if y, err = strconv.ParseFloat(parts[1], 64); err != nil {
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55 return nil, err
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56 }
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57 if z, err = strconv.ParseFloat(parts[2], 64); err != nil {
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58 return nil, err
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59 }
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60 points = append(points, octree.Vertex{X: x, Y: y, Z: z})
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61 }
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62
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63 return points, nil
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64 }
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65
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66 func minMax(points []octree.Vertex) (octree.Vertex, octree.Vertex) {
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67 if len(points) == 0 {
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68 return octree.Vertex{}, octree.Vertex{}
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69 }
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70
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71 min, max := points[0], points[0]
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72
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73 for _, v := range points {
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74 min.Minimize(v)
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75 max.Maximize(v)
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76 }
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77
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78 return min, max
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79 }
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80
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81 func check(err error) {
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82 if err != nil {
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83 log.Fatalf("error: %v\n", err)
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84 }
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85 }
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86
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87 func intersectTriangles(tri *octree.Triangulation, heights []float64) [][]octree.LineStringZ {
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88
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89 type indexedCut struct {
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90 cut octree.LineStringZ
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91 index int32
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92 }
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93
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94 cuts := make([][]indexedCut, len(heights))
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95
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96 classes := make([][]int32, len(heights)+1)
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97
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98 all:
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99 for i := int32(0); i < int32(len(tri.Triangles)); i += 3 {
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100 ti := tri.Triangles[i : i+3]
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101 v0 := tri.Points[ti[0]]
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102 v1 := tri.Points[ti[1]]
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103 v2 := tri.Points[ti[2]]
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104 min := math.Min(v0.Z, math.Min(v1.Z, v2.Z))
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105
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106 if min > heights[len(heights)-1] {
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107 classes[len(classes)-1] = append(classes[len(classes)-1], i/3)
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108 continue
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109 }
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110 max := math.Max(v0.Z, math.Max(v1.Z, v2.Z))
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111
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112 for j, h := range heights {
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113
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114 var l float64
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115 if j > 0 {
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116 l = heights[j-1]
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diff changeset
117 } else {
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diff changeset
118 l = -math.MaxFloat64
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parents: 4532
diff changeset
119 }
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parents: 4532
diff changeset
120
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diff changeset
121 if l < min && max < h {
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parents: 4532
diff changeset
122 classes[j] = append(classes[j], i/3)
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diff changeset
123 continue all
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parents: 4532
diff changeset
124 }
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parents: 4532
diff changeset
125 if min > h || max < h {
4532
769f723c2581 Cut triangles against class breaks.
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parents: 4531
diff changeset
126 continue
769f723c2581 Cut triangles against class breaks.
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parents: 4531
diff changeset
127 }
4540
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diff changeset
128 t := octree.Triangle{v0, v1, v2}
4533
3998a9ab69c6 Find out which triangles are fully inside classes.
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diff changeset
129 cut := t.IntersectHorizontal(h)
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diff changeset
130 if len(cut) >= 2 {
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parents: 4532
diff changeset
131 cuts[j] = append(cuts[j], indexedCut{cut, i / 3})
4532
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diff changeset
132 }
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parents: 4531
diff changeset
133 }
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parents: 4531
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134 }
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135
4540
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diff changeset
136 result := make([][]octree.LineStringZ, len(classes))
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137
4533
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diff changeset
138 log.Println("inside classes:")
4535
508075a5694e Only keep the indices of the triangles of the border of the iso patches.
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diff changeset
139 for i, c := range classes {
4540
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140
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diff changeset
141 var pb polygonBuilder
4535
508075a5694e Only keep the indices of the triangles of the border of the iso patches.
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142
4540
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diff changeset
143 var isolated, inside int
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diff changeset
144 allInClass:
4534
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diff changeset
145 for _, idx := range c {
4540
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diff changeset
146 ns := neighbors(tri, idx)
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diff changeset
147 w := where(ns, c)
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diff changeset
148 switch bits.OnesCount8(w) {
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diff changeset
149 case 0:
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diff changeset
150 // Totally insides do not contribute to the geometries.
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diff changeset
151 inside++
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
152 continue allInClass
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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diff changeset
153 case 3:
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diff changeset
154 // Isolated are areas w/o connections to the rest.
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diff changeset
155 isolated++
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
156 ti := tri.Triangles[idx*3 : idx*3+3]
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parents: 4539
diff changeset
157 pb.addTriangle(
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
158 tri.Points[ti[0]],
e01b6e7cbe7d Detect isolated triangles as standalone areas.
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parents: 4539
diff changeset
159 tri.Points[ti[1]],
e01b6e7cbe7d Detect isolated triangles as standalone areas.
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parents: 4539
diff changeset
160 tri.Points[ti[2]])
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
161 continue allInClass
4534
b7d31a449dd2 Find out how many inner triangles can be skipped because they are totally inside a class polygon.
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parents: 4533
diff changeset
162 }
b7d31a449dd2 Find out how many inner triangles can be skipped because they are totally inside a class polygon.
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parents: 4533
diff changeset
163 }
4540
e01b6e7cbe7d Detect isolated triangles as standalone areas.
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parents: 4539
diff changeset
164
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
165 log.Printf("\t%d: inside: %d / isolated: %d\n",
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
166 i, inside, isolated)
e01b6e7cbe7d Detect isolated triangles as standalone areas.
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parents: 4539
diff changeset
167
e01b6e7cbe7d Detect isolated triangles as standalone areas.
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diff changeset
168 result[i] = pb.polygons
4533
3998a9ab69c6 Find out which triangles are fully inside classes.
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parents: 4532
diff changeset
169 }
3998a9ab69c6 Find out which triangles are fully inside classes.
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parents: 4532
diff changeset
170
3998a9ab69c6 Find out which triangles are fully inside classes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4532
diff changeset
171 log.Println("cuts:")
3998a9ab69c6 Find out which triangles are fully inside classes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4532
diff changeset
172 for i, c := range cuts {
3998a9ab69c6 Find out which triangles are fully inside classes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4532
diff changeset
173 log.Printf("\t%.3f: %d\n", heights[i], len(c))
4532
769f723c2581 Cut triangles against class breaks.
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parents: 4531
diff changeset
174 }
769f723c2581 Cut triangles against class breaks.
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parents: 4531
diff changeset
175
4540
e01b6e7cbe7d Detect isolated triangles as standalone areas.
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parents: 4539
diff changeset
176 return result
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parents: 4539
diff changeset
177
4532
769f723c2581 Cut triangles against class breaks.
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parents: 4531
diff changeset
178 // TODO: sew segments together.
769f723c2581 Cut triangles against class breaks.
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parents: 4531
diff changeset
179
769f723c2581 Cut triangles against class breaks.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4531
diff changeset
180 }
769f723c2581 Cut triangles against class breaks.
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parents: 4531
diff changeset
181
4540
e01b6e7cbe7d Detect isolated triangles as standalone areas.
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diff changeset
182 type polygonBuilder struct {
e01b6e7cbe7d Detect isolated triangles as standalone areas.
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parents: 4539
diff changeset
183 polygons []octree.LineStringZ
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parents: 4539
diff changeset
184 }
e01b6e7cbe7d Detect isolated triangles as standalone areas.
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parents: 4539
diff changeset
185
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
186 func (pb *polygonBuilder) addTriangle(v0, v1, v2 octree.Vertex) {
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
187 polygon := octree.LineStringZ{v0, v1, v2, v0}
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
188 pb.polygons = append(pb.polygons, polygon)
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parents: 4539
diff changeset
189 }
e01b6e7cbe7d Detect isolated triangles as standalone areas.
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parents: 4539
diff changeset
190
4534
b7d31a449dd2 Find out how many inner triangles can be skipped because they are totally inside a class polygon.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4533
diff changeset
191 func neighbors(t *octree.Triangulation, idx int32) []int32 {
b7d31a449dd2 Find out how many inner triangles can be skipped because they are totally inside a class polygon.
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parents: 4533
diff changeset
192 idx *= 3
b7d31a449dd2 Find out how many inner triangles can be skipped because they are totally inside a class polygon.
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parents: 4533
diff changeset
193 return t.Halfedges[idx : idx+3]
b7d31a449dd2 Find out how many inner triangles can be skipped because they are totally inside a class polygon.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4533
diff changeset
194 }
b7d31a449dd2 Find out how many inner triangles can be skipped because they are totally inside a class polygon.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4533
diff changeset
195
4538
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
196 func contains(needle int32, haystack []int32) bool {
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
197 lo, hi := 0, len(haystack)-1
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
198 for lo <= hi {
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
199 mid := (hi-lo)/2 + lo
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
200 switch v := haystack[mid]; {
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
201 case v < needle:
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
202 lo = mid + 1
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
203 case v > needle:
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
204 hi = mid - 1
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
205 default:
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
206 return true
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
207 }
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
208 }
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
209 return false
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
210 }
46c9a731a686 Use custom binary search in triangle indices.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4536
diff changeset
211
4540
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
212 func where(neighbors, indices []int32) byte {
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
213 var mask byte
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
214 for i, n := range neighbors {
4539
99928231b679 Code simplification.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4538
diff changeset
215 if n < 0 || !contains(n/3, indices) {
4540
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
216 mask |= 1 << i
4534
b7d31a449dd2 Find out how many inner triangles can be skipped because they are totally inside a class polygon.
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parents: 4533
diff changeset
217 }
b7d31a449dd2 Find out how many inner triangles can be skipped because they are totally inside a class polygon.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4533
diff changeset
218 }
4540
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
219 return mask
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
220 }
4534
b7d31a449dd2 Find out how many inner triangles can be skipped because they are totally inside a class polygon.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4533
diff changeset
221
4540
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
222 func dumpPolygonsSVG(
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
223 w io.Writer,
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
224 min, max octree.Vertex,
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
225 polygons [][]octree.LineStringZ,
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
226 ) error {
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
227
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
228 ratio := (max.X - min.X) / (max.Y - min.Y)
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
229
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
230 log.Printf("ratio: %.2f\n", ratio)
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
231
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
232 // TODO: Implement me!
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
233
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
234 return nil
4534
b7d31a449dd2 Find out how many inner triangles can be skipped because they are totally inside a class polygon.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4533
diff changeset
235 }
b7d31a449dd2 Find out how many inner triangles can be skipped because they are totally inside a class polygon.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4533
diff changeset
236
4531
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
237 func main() {
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
238
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
239 heights, err := octree.ParseClassBreaks(classBreaks)
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
240 check(err)
4533
3998a9ab69c6 Find out which triangles are fully inside classes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4532
diff changeset
241 log.Printf("num classes: %d\n", len(heights))
4531
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
242
4533
3998a9ab69c6 Find out which triangles are fully inside classes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4532
diff changeset
243 start := time.Now()
4531
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
244 xyz, err := loadXYZ(os.Stdin)
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
245 check(err)
4533
3998a9ab69c6 Find out which triangles are fully inside classes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4532
diff changeset
246 log.Printf("loading took %v\n", time.Since(start))
4531
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
247
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
248 log.Printf("num vertices: %d\n", len(xyz))
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
249
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
250 min, max := minMax(xyz)
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
251
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
252 log.Printf("(%.2f, %.2f, %.2f) - (%.2f, %.2f, %.2f)\n",
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
253 min.X, min.Y, min.Z,
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
254 max.X, max.Y, max.Z)
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
255
4533
3998a9ab69c6 Find out which triangles are fully inside classes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4532
diff changeset
256 start = time.Now()
4531
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
257 tri, err := octree.Triangulate(xyz)
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
258 check(err)
4536
3130c005abef Measure time of triangulation correctly.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4535
diff changeset
259 log.Printf("triangulation took %v\n", time.Since(start))
4531
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
260
4533
3998a9ab69c6 Find out which triangles are fully inside classes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4532
diff changeset
261 log.Printf("number of triangles: %d\n", len(tri.Triangles)/3)
3998a9ab69c6 Find out which triangles are fully inside classes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4532
diff changeset
262
3998a9ab69c6 Find out which triangles are fully inside classes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4532
diff changeset
263 start = time.Now()
4540
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
264 polygons := intersectTriangles(tri, heights)
4532
769f723c2581 Cut triangles against class breaks.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4531
diff changeset
265 log.Printf("intersecting triangles took %v.\n", time.Since(start))
4540
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
266
e01b6e7cbe7d Detect isolated triangles as standalone areas.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4539
diff changeset
267 check(dumpPolygonsSVG(os.Stdout, min, max, polygons))
4531
c9b6be8d81c8 Started a branch to calculate the iso areas for a given triangulation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
268 }