Mercurial > gemma
annotate pkg/octree/tree.go @ 3624:3012d0b3badc
Allow same values for depth_reference in SR as in gauges
The depth_reference in a sounding result references a depth_reference
of the bottlenecks reference gauge. Therefor the same values must be
accepted, which means the restriction to four chars is no good.
In the real world this might be something as "LDC2010", which is
obviously longer.
author | Sascha Wilde <wilde@intevation.de> |
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date | Wed, 05 Jun 2019 18:50:54 +0200 |
parents | 7686c7c23506 |
children | a6c671abbc35 |
rev | line source |
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1017
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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 ) |
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19 |
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20 // Tree is an Octree holding triangles. |
727
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21 type Tree struct { |
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22 // EPSG is the projection. |
726
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23 EPSG uint32 |
707
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24 |
726
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25 vertices []Vertex |
707
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26 triangles [][]int32 |
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27 index []int32 |
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28 |
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29 // Min is the lower left corner of the bbox. |
726
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30 Min Vertex |
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31 // Max is the upper right corner of the bbox. |
726
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32 Max Vertex |
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33 } |
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34 |
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35 type boxFrame struct { |
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36 pos int32 |
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37 Box2D |
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38 } |
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39 |
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40 func (ot *Tree) Vertices() []Vertex { |
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41 return ot.vertices |
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42 } |
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43 |
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44 var scale = [4][4]float64{ |
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45 {0.0, 0.0, 0.5, 0.5}, |
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46 {0.5, 0.0, 1.0, 0.5}, |
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47 {0.0, 0.5, 0.5, 1.0}, |
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48 {0.5, 0.5, 1.0, 1.0}, |
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49 } |
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50 |
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51 func (ot *Tree) Value(x, y float64) (float64, bool) { |
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52 |
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53 // out of bounding box |
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54 if x < ot.Min.X || ot.Max.X < x || |
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55 y < ot.Min.Y || ot.Max.Y < y { |
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56 return 0, false |
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57 } |
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58 |
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59 all := Box2D{ot.Min.X, ot.Min.Y, ot.Max.X, ot.Max.Y} |
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60 |
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61 stack := []boxFrame{{1, all}} |
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62 |
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63 for len(stack) > 0 { |
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64 top := stack[len(stack)-1] |
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65 stack = stack[:len(stack)-1] |
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66 |
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67 if top.pos > 0 { // node |
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68 if index := ot.index[top.pos:]; len(index) > 7 { |
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69 for i := 0; i < 4; i++ { |
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70 a := index[i] |
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71 b := index[i+4] |
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72 if a == 0 && b == 0 { |
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73 continue |
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74 } |
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75 dx := top.X2 - top.X1 |
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76 dy := top.Y2 - top.Y1 |
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77 nbox := Box2D{ |
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78 dx*scale[i][0] + top.X1, |
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79 dy*scale[i][1] + top.Y1, |
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80 dx*scale[i][2] + top.X1, |
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81 dy*scale[i][3] + top.Y1, |
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82 } |
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83 if nbox.Contains(x, y) { |
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84 if a != 0 { |
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85 stack = append(stack, boxFrame{a, nbox}) |
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86 } |
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87 if b != 0 { |
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88 stack = append(stack, boxFrame{b, nbox}) |
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89 } |
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90 break |
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91 } |
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92 } |
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93 } |
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94 } else { // leaf |
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95 pos := -top.pos - 1 |
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96 n := ot.index[pos] |
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97 indices := ot.index[pos+1 : pos+1+n] |
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98 |
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99 for _, idx := range indices { |
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100 tri := ot.triangles[idx] |
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101 t := Triangle{ |
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102 ot.vertices[tri[0]], |
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103 ot.vertices[tri[1]], |
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104 ot.vertices[tri[2]], |
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105 } |
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106 if t.Contains(x, y) { |
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107 return t.Plane3D().Z(x, y), true |
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108 } |
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109 } |
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110 } |
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111 } |
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112 |
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113 return 0, false |
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114 } |
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115 |
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116 // Vertical does a vertical cross cut from (x1, y1) to (x2, y2). |
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117 func (ot *Tree) Vertical(x1, y1, x2, y2 float64, fn func(*Triangle)) { |
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118 |
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119 box := Box2D{ |
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120 X1: math.Min(x1, x2), |
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121 Y1: math.Min(y1, y2), |
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122 X2: math.Max(x1, x2), |
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123 Y2: math.Max(y1, y2), |
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124 } |
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125 |
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126 // out of bounding box |
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127 if box.X2 < ot.Min.X || ot.Max.X < box.X1 || |
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128 box.Y2 < ot.Min.Y || ot.Max.Y < box.Y1 { |
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129 return |
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130 } |
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131 |
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132 line := NewPlane2D(x1, y1, x2, y2) |
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133 |
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134 dupes := map[int32]struct{}{} |
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135 |
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136 all := Box2D{ot.Min.X, ot.Min.Y, ot.Max.X, ot.Max.Y} |
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137 //log.Printf("area: %f\n", (box.x2-box.x1)*(box.y2-box.y1)) |
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138 //log.Printf("all: %f\n", (all.x2-all.x1)*(all.y2-all.y1)) |
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139 |
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140 stack := []boxFrame{{1, all}} |
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141 |
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142 for len(stack) > 0 { |
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143 top := stack[len(stack)-1] |
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144 stack = stack[:len(stack)-1] |
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145 |
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146 if top.pos > 0 { // node |
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147 if index := ot.index[top.pos:]; len(index) > 7 { |
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148 for i := 0; i < 4; i++ { |
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149 a := index[i] |
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150 b := index[i+4] |
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151 if a == 0 && b == 0 { |
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152 continue |
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153 } |
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154 dx := top.X2 - top.X1 |
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155 dy := top.Y2 - top.Y1 |
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156 nbox := Box2D{ |
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157 dx*scale[i][0] + top.X1, |
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158 dy*scale[i][1] + top.Y1, |
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159 dx*scale[i][2] + top.X1, |
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160 dy*scale[i][3] + top.Y1, |
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161 } |
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162 if nbox.Intersects(box) && nbox.IntersectsPlane(line) { |
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163 if a != 0 { |
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164 stack = append(stack, boxFrame{a, nbox}) |
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165 } |
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166 if b != 0 { |
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167 stack = append(stack, boxFrame{b, nbox}) |
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168 } |
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169 } |
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170 } |
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171 } |
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172 } else { // leaf |
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173 pos := -top.pos - 1 |
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174 n := ot.index[pos] |
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175 indices := ot.index[pos+1 : pos+1+n] |
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176 |
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177 for _, idx := range indices { |
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178 if _, found := dupes[idx]; found { |
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179 continue |
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180 } |
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181 tri := ot.triangles[idx] |
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182 t := Triangle{ |
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183 ot.vertices[tri[0]], |
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184 ot.vertices[tri[1]], |
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185 ot.vertices[tri[2]], |
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186 } |
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187 |
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188 v0 := line.Eval(t[0].X, t[0].Y) |
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189 v1 := line.Eval(t[1].X, t[1].Y) |
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190 v2 := line.Eval(t[2].X, t[2].Y) |
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191 |
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192 if onPlane(v0) || onPlane(v1) || onPlane(v2) || |
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193 sides(sides(sides(0, v0), v1), v2) == 3 { |
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194 fn(&t) |
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195 } |
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196 dupes[idx] = struct{}{} |
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197 } |
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198 } |
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199 } |
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200 } |
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201 |
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202 // Horizontal does a horizontal cross cut. |
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203 func (ot *Tree) Horizontal(h float64, fn func(*Triangle)) { |
707
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204 |
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205 if h < ot.Min.Z || ot.Max.Z < h { |
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206 return |
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207 } |
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208 |
707
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209 type frame struct { |
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210 pos int32 |
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211 min float64 |
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212 max float64 |
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213 } |
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214 |
756
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215 dupes := map[int32]struct{}{} |
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216 |
756
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217 stack := []frame{{1, ot.Min.Z, ot.Max.Z}} |
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218 |
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219 for len(stack) > 0 { |
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220 top := stack[len(stack)-1] |
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221 stack = stack[:len(stack)-1] |
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222 |
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223 pos := top.pos |
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224 if pos == 0 { |
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225 continue |
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226 } |
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227 min, max := top.min, top.max |
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228 |
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229 if pos > 0 { // node |
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230 if mid := (max-min)*0.5 + min; h >= mid { |
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231 pos += 4 // nodes with z-bit set |
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232 min = mid |
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233 } else { |
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234 max = mid |
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235 } |
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236 if pos < int32(len(ot.index)) { |
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237 if index := ot.index[pos:]; len(index) > 3 { |
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238 stack = append(stack, |
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239 frame{index[0], min, max}, |
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240 frame{index[1], min, max}, |
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241 frame{index[2], min, max}, |
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242 frame{index[3], min, max}) |
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243 } |
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244 } |
707
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245 } else { // leaf |
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246 pos = -pos - 1 |
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247 n := ot.index[pos] |
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248 //log.Printf("%d %d %d\n", pos, n, len(ot.index)) |
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249 indices := ot.index[pos+1 : pos+1+n] |
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250 |
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251 for _, idx := range indices { |
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252 if _, found := dupes[idx]; found { |
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253 continue |
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254 } |
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255 tri := ot.triangles[idx] |
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256 t := Triangle{ |
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257 ot.vertices[tri[0]], |
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258 ot.vertices[tri[1]], |
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259 ot.vertices[tri[2]], |
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260 } |
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261 |
727
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262 if !(math.Min(t[0].Z, math.Min(t[1].Z, t[2].Z)) > h || |
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263 math.Max(t[0].Z, math.Max(t[1].Z, t[2].Z)) < h) { |
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264 dupes[idx] = struct{}{} |
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265 fn(&t) |
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266 } |
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267 } |
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268 } |
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269 } |
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270 } |
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271 |
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272 func (ot *Tree) Diff(other *Tree) PointMap { |
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273 |
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274 firstVs, secondVs := ot.Vertices(), other.Vertices() |
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275 |
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276 result := make(PointMap, len(firstVs)+len(secondVs)) |
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277 |
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278 sliceWork( |
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279 firstVs, |
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280 result, |
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281 func(slice []Vertex, turn func([]Vertex) []Vertex) { |
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282 p := turn(nil) |
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283 for i := range slice { |
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284 v := &slice[i] |
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285 if z, found := other.Value(v.X, v.Y); found { |
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286 p = append(p, Vertex{v.X, v.Y, v.Z - z}) |
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287 if len(p) == cap(p) { |
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288 p = turn(p) |
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289 } |
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290 } |
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291 } |
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292 if len(p) > 0 { |
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293 turn(p) |
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294 } |
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295 }) |
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296 |
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297 sliceWork( |
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298 secondVs, |
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299 result, |
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300 func( |
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301 slice []Vertex, turn func([]Vertex) []Vertex) { |
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302 p := turn(nil) |
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303 for i := range slice { |
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304 v := &slice[i] |
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305 if z, found := ot.Value(v.X, v.Y); found { |
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306 p = append(p, Vertex{v.X, v.Y, z - v.Z}) |
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307 if len(p) == cap(p) { |
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308 p = turn(p) |
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309 } |
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310 } |
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311 } |
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312 if len(p) > 0 { |
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313 turn(p) |
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314 } |
7686c7c23506
Morphological differences: Moved some code into octree package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
2516
diff
changeset
|
315 }) |
7686c7c23506
Morphological differences: Moved some code into octree package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
2516
diff
changeset
|
316 |
7686c7c23506
Morphological differences: Moved some code into octree package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
2516
diff
changeset
|
317 return result |
7686c7c23506
Morphological differences: Moved some code into octree package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
2516
diff
changeset
|
318 } |