Mercurial > gemma
annotate pkg/octree/tree.go @ 4305:0f467a839fe2
Moved stretches as shape file download to separate file.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 02 Sep 2019 18:01:45 +0200 |
parents | d12c2f4d3483 |
children | 8f745c353784 |
rev | line source |
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1017
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Added GNU Affero General Public License.
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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 |
727
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14 package octree |
707
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15 |
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16 import ( |
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17 "math" |
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18 "runtime" |
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19 "sync" |
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20 |
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21 "gemma.intevation.de/gemma/pkg/common" |
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22 ) |
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23 |
1692
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24 // Tree is an Octree holding triangles. |
727
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25 type Tree struct { |
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26 // EPSG is the projection. |
726
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27 EPSG uint32 |
707
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28 |
726
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29 vertices []Vertex |
707
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30 triangles [][]int32 |
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31 index []int32 |
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32 |
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33 // Min is the lower left corner of the bbox. |
726
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34 Min Vertex |
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35 // Max is the upper right corner of the bbox. |
726
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36 Max Vertex |
707
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37 } |
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38 |
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39 type boxFrame struct { |
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40 pos int32 |
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41 Box2D |
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42 } |
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43 |
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44 func (ot *Tree) Vertices() []Vertex { |
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45 return ot.vertices |
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46 } |
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47 |
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48 var scale = [4][4]float64{ |
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49 {0.0, 0.0, 0.5, 0.5}, |
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50 {0.5, 0.0, 1.0, 0.5}, |
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51 {0.0, 0.5, 0.5, 1.0}, |
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52 {0.5, 0.5, 1.0, 1.0}, |
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53 } |
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54 |
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55 func (ot *Tree) Value(x, y float64) (float64, bool) { |
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56 |
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57 // out of bounding box |
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58 if x < ot.Min.X || ot.Max.X < x || |
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59 y < ot.Min.Y || ot.Max.Y < y { |
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60 return 0, false |
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61 } |
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62 |
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63 all := Box2D{ot.Min.X, ot.Min.Y, ot.Max.X, ot.Max.Y} |
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64 |
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65 stack := []boxFrame{{1, all}} |
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66 |
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67 for len(stack) > 0 { |
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68 top := stack[len(stack)-1] |
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69 stack = stack[:len(stack)-1] |
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70 |
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71 if top.pos > 0 { // node |
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72 if index := ot.index[top.pos:]; len(index) > 7 { |
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73 for i := 0; i < 4; i++ { |
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74 a := index[i] |
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75 b := index[i+4] |
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76 if a == 0 && b == 0 { |
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77 continue |
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78 } |
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79 dx := top.X2 - top.X1 |
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80 dy := top.Y2 - top.Y1 |
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81 nbox := Box2D{ |
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82 dx*scale[i][0] + top.X1, |
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83 dy*scale[i][1] + top.Y1, |
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84 dx*scale[i][2] + top.X1, |
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85 dy*scale[i][3] + top.Y1, |
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86 } |
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87 if nbox.Contains(x, y) { |
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88 if a != 0 { |
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89 stack = append(stack, boxFrame{a, nbox}) |
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90 } |
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91 if b != 0 { |
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92 stack = append(stack, boxFrame{b, nbox}) |
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93 } |
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94 break |
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95 } |
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96 } |
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97 } |
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98 } else { // leaf |
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99 pos := -top.pos - 1 |
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100 n := ot.index[pos] |
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101 indices := ot.index[pos+1 : pos+1+n] |
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102 |
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103 for _, idx := range indices { |
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104 tri := ot.triangles[idx] |
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105 t := Triangle{ |
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106 ot.vertices[tri[0]], |
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107 ot.vertices[tri[1]], |
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108 ot.vertices[tri[2]], |
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109 } |
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110 if t.Contains(x, y) { |
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111 return t.Plane3D().Z(x, y), true |
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112 } |
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113 } |
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114 } |
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115 } |
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116 |
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117 return 0, false |
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118 } |
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119 |
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120 // Vertical does a vertical cross cut from (x1, y1) to (x2, y2). |
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121 func (ot *Tree) Vertical(x1, y1, x2, y2 float64, fn func(*Triangle)) { |
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122 |
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123 box := Box2D{ |
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124 X1: math.Min(x1, x2), |
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125 Y1: math.Min(y1, y2), |
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126 X2: math.Max(x1, x2), |
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127 Y2: math.Max(y1, y2), |
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128 } |
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129 |
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130 // out of bounding box |
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131 if box.X2 < ot.Min.X || ot.Max.X < box.X1 || |
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132 box.Y2 < ot.Min.Y || ot.Max.Y < box.Y1 { |
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133 return |
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134 } |
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135 |
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136 line := NewPlane2D(x1, y1, x2, y2) |
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137 |
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138 dupes := map[int32]struct{}{} |
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139 |
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140 all := Box2D{ot.Min.X, ot.Min.Y, ot.Max.X, ot.Max.Y} |
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141 //log.Printf("area: %f\n", (box.x2-box.x1)*(box.y2-box.y1)) |
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142 //log.Printf("all: %f\n", (all.x2-all.x1)*(all.y2-all.y1)) |
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143 |
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144 stack := []boxFrame{{1, all}} |
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145 |
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146 for len(stack) > 0 { |
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147 top := stack[len(stack)-1] |
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148 stack = stack[:len(stack)-1] |
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149 |
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150 if top.pos > 0 { // node |
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151 if index := ot.index[top.pos:]; len(index) > 7 { |
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152 for i := 0; i < 4; i++ { |
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153 a := index[i] |
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154 b := index[i+4] |
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155 if a == 0 && b == 0 { |
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156 continue |
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157 } |
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158 dx := top.X2 - top.X1 |
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159 dy := top.Y2 - top.Y1 |
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160 nbox := Box2D{ |
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161 dx*scale[i][0] + top.X1, |
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162 dy*scale[i][1] + top.Y1, |
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163 dx*scale[i][2] + top.X1, |
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164 dy*scale[i][3] + top.Y1, |
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165 } |
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166 if nbox.Intersects(box) && nbox.IntersectsPlane(line) { |
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167 if a != 0 { |
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168 stack = append(stack, boxFrame{a, nbox}) |
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169 } |
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170 if b != 0 { |
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171 stack = append(stack, boxFrame{b, nbox}) |
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172 } |
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173 } |
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174 } |
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175 } |
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176 } else { // leaf |
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177 pos := -top.pos - 1 |
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178 n := ot.index[pos] |
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179 indices := ot.index[pos+1 : pos+1+n] |
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180 |
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181 for _, idx := range indices { |
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182 if _, found := dupes[idx]; found { |
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183 continue |
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184 } |
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185 tri := ot.triangles[idx] |
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186 t := Triangle{ |
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187 ot.vertices[tri[0]], |
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188 ot.vertices[tri[1]], |
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189 ot.vertices[tri[2]], |
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190 } |
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191 |
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192 v0 := line.Eval(t[0].X, t[0].Y) |
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193 v1 := line.Eval(t[1].X, t[1].Y) |
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194 v2 := line.Eval(t[2].X, t[2].Y) |
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195 |
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196 if onPlane(v0) || onPlane(v1) || onPlane(v2) || |
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197 sides(sides(sides(0, v0), v1), v2) == 3 { |
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198 fn(&t) |
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199 } |
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200 dupes[idx] = struct{}{} |
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201 } |
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202 } |
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203 } |
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204 } |
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205 |
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206 // Horizontal does a horizontal cross cut. |
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207 func (ot *Tree) Horizontal(h float64, fn func(*Triangle)) { |
707
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octree: Moved octree traveral code to own file.
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208 |
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209 if h < ot.Min.Z || ot.Max.Z < h { |
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210 return |
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211 } |
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212 |
707
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213 type frame struct { |
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214 pos int32 |
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215 min float64 |
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216 max float64 |
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217 } |
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218 |
756
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219 dupes := map[int32]struct{}{} |
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220 |
756
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221 stack := []frame{{1, ot.Min.Z, ot.Max.Z}} |
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222 |
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223 for len(stack) > 0 { |
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224 top := stack[len(stack)-1] |
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225 stack = stack[:len(stack)-1] |
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226 |
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227 pos := top.pos |
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228 if pos == 0 { |
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229 continue |
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230 } |
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231 min, max := top.min, top.max |
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232 |
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233 if pos > 0 { // node |
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234 if mid := (max-min)*0.5 + min; h >= mid { |
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235 pos += 4 // nodes with z-bit set |
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236 min = mid |
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237 } else { |
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238 max = mid |
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239 } |
2479
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240 if pos < int32(len(ot.index)) { |
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241 if index := ot.index[pos:]; len(index) > 3 { |
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242 stack = append(stack, |
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243 frame{index[0], min, max}, |
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244 frame{index[1], min, max}, |
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245 frame{index[2], min, max}, |
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246 frame{index[3], min, max}) |
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247 } |
1788
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248 } |
707
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249 } else { // leaf |
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250 pos = -pos - 1 |
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251 n := ot.index[pos] |
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252 //log.Printf("%d %d %d\n", pos, n, len(ot.index)) |
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253 indices := ot.index[pos+1 : pos+1+n] |
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254 |
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255 for _, idx := range indices { |
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256 if _, found := dupes[idx]; found { |
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257 continue |
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258 } |
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259 tri := ot.triangles[idx] |
726
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Renamed a few types to uppercase names to prepare the move to the octree package.
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260 t := Triangle{ |
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261 ot.vertices[tri[0]], |
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262 ot.vertices[tri[1]], |
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263 ot.vertices[tri[2]], |
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264 } |
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265 |
727
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266 if !(math.Min(t[0].Z, math.Min(t[1].Z, t[2].Z)) > h || |
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267 math.Max(t[0].Z, math.Max(t[1].Z, t[2].Z)) < h) { |
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268 dupes[idx] = struct{}{} |
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269 fn(&t) |
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270 } |
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271 } |
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272 } |
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273 } |
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274 } |
2572
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275 |
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276 func (ot *Tree) Diff(other *Tree) PointMap { |
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277 |
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278 firstVs, secondVs := ot.Vertices(), other.Vertices() |
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279 |
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280 result := make(PointMap, len(firstVs)+len(secondVs)) |
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281 |
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282 sliceWork( |
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283 firstVs, |
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284 result, |
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285 func(slice []Vertex, turn func([]Vertex) []Vertex) { |
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286 p := turn(nil) |
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287 for i := range slice { |
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288 v := &slice[i] |
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289 if z, found := other.Value(v.X, v.Y); found { |
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290 p = append(p, Vertex{v.X, v.Y, v.Z - z}) |
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291 if len(p) == cap(p) { |
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292 p = turn(p) |
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293 } |
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294 } |
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295 } |
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296 if len(p) > 0 { |
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297 turn(p) |
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298 } |
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299 }) |
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300 |
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301 sliceWork( |
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302 secondVs, |
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303 result, |
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304 func( |
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305 slice []Vertex, turn func([]Vertex) []Vertex) { |
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306 p := turn(nil) |
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307 for i := range slice { |
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308 v := &slice[i] |
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309 if z, found := ot.Value(v.X, v.Y); found { |
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310 p = append(p, Vertex{v.X, v.Y, z - v.Z}) |
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311 if len(p) == cap(p) { |
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312 p = turn(p) |
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313 } |
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314 } |
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315 } |
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316 if len(p) > 0 { |
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317 turn(p) |
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318 } |
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319 }) |
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320 |
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321 return result |
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322 } |
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323 |
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324 func (ot *Tree) GenerateRandomVertices(n int, callback func([]Vertex)) { |
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325 var wg sync.WaitGroup |
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326 |
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327 jobs := make(chan int) |
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328 out := make(chan []Vertex) |
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329 done := make(chan struct{}) |
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330 |
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331 cpus := runtime.NumCPU() |
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332 |
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333 free := make(chan []Vertex, cpus) |
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334 |
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335 for i := 0; i < cpus; i++ { |
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336 wg.Add(1) |
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337 go func() { |
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338 defer wg.Done() |
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339 xRange := common.Random(ot.Min.X, ot.Max.X) |
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340 yRange := common.Random(ot.Min.Y, ot.Max.Y) |
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341 |
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342 for size := range jobs { |
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343 var vertices []Vertex |
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344 select { |
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345 case vertices = <-free: |
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346 default: |
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347 vertices = make([]Vertex, 0, 1000) |
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348 } |
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349 for len(vertices) < size { |
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350 x, y := xRange(), yRange() |
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351 if z, ok := ot.Value(x, y); ok { |
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352 vertices = append(vertices, Vertex{X: x, Y: y, Z: z}) |
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353 } |
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354 } |
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355 out <- vertices |
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356 } |
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357 }() |
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358 } |
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359 |
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360 go func() { |
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361 defer close(done) |
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362 for vertices := range out { |
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363 callback(vertices) |
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364 select { |
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365 case free <- vertices[:0]: |
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366 default: |
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367 } |
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368 } |
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369 }() |
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370 |
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371 for remain := n; remain > 0; { |
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372 if remain > 1000 { |
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373 jobs <- 1000 |
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374 remain -= 1000 |
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375 } else { |
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376 jobs <- remain |
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377 remain = 0 |
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378 } |
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379 } |
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380 close(jobs) |
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381 wg.Wait() |
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382 close(out) |
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383 <-done |
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384 } |