Mercurial > gemma
annotate pkg/mesh/tin.go @ 4931:e41d42be0e13 fairway-marks-import
One more callback to avoid code duplication more consequently
author | Tom Gottfried <tom@intevation.de> |
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date | Fri, 14 Feb 2020 19:34:08 +0100 |
parents | 4847ac70103a |
children | 5f47eeea988d |
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 |
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14 package mesh |
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15 |
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16 import ( |
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17 "bytes" |
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18 "encoding/binary" |
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19 "errors" |
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20 "fmt" |
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21 "io" |
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22 "log" |
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23 "math" |
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24 |
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25 "gemma.intevation.de/gemma/pkg/models" |
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26 "gemma.intevation.de/gemma/pkg/wkb" |
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27 ) |
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28 |
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29 var ( |
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30 errNoByteSlice = errors.New("not a byte slice") |
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31 errTooLessPoints = errors.New("too less points") |
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32 ) |
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33 |
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34 // Tin stores a mesh of triangles with common vertices. |
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35 type Tin struct { |
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36 // EPSG holds the projection. |
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37 EPSG uint32 |
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38 // Vertices are the shared vertices. |
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39 Vertices []Vertex |
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40 // Triangles are the triangles. |
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41 Triangles [][]int32 |
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42 |
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43 // Min is the lower left corner of the bbox. |
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44 Min Vertex |
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45 // Max is the upper right corner of the bbox. |
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46 Max Vertex |
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47 } |
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48 |
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49 func (t *Tin) Clip(polygon *Polygon) map[int32]struct{} { |
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50 var tree STRTree |
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51 tree.Build(t) |
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52 return tree.Clip(polygon) |
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53 } |
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54 |
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55 // FromWKB constructs the TIN from a WKB representation. |
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56 // Shared vertices are identified and referenced by the |
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57 // same index. |
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58 func (t *Tin) FromWKB(data []byte) error { |
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59 log.Printf("info: data length %d\n", len(data)) |
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60 |
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61 r := bytes.NewReader(data) |
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62 |
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63 endian, err := r.ReadByte() |
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64 |
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65 var order binary.ByteOrder |
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66 |
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67 switch { |
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68 case err != nil: |
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69 return err |
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70 case endian == wkb.NDR: |
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71 order = binary.LittleEndian |
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72 case endian == wkb.XDR: |
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73 order = binary.BigEndian |
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74 default: |
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75 return fmt.Errorf("unknown byte order %x", endian) |
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76 } |
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77 |
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78 var geomType uint32 |
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79 err = binary.Read(r, order, &geomType) |
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80 |
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81 switch { |
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82 case err != nil: |
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83 return err |
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84 case geomType != wkb.TinZ: |
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85 return fmt.Errorf("unknown geometry type %x", geomType) |
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86 } |
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87 |
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88 var num uint32 |
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89 if err = binary.Read(r, order, &num); err != nil { |
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90 return err |
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91 } |
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92 |
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93 vertices := make([]Vertex, 0, 100000) |
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94 |
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95 var v Vertex |
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96 |
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97 v2i := make(map[Vertex]int32, 100000) |
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98 |
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99 var indexPool []int32 |
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100 |
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101 allocIndices := func() []int32 { |
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102 if len(indexPool) == 0 { |
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103 indexPool = make([]int32, 3*8*1024) |
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104 } |
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105 ids := indexPool[:3] |
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106 indexPool = indexPool[3:] |
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107 return ids |
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108 } |
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109 |
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110 var triangles [][]int32 |
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111 |
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112 min := Vertex{math.MaxFloat64, math.MaxFloat64, math.MaxFloat64} |
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113 max := Vertex{-math.MaxFloat64, -math.MaxFloat64, -math.MaxFloat64} |
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114 |
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115 for i := uint32(0); i < num; i++ { |
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116 |
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117 endian, err = r.ReadByte() |
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118 switch { |
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119 case err != nil: |
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120 return err |
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121 case endian == wkb.NDR: |
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122 order = binary.LittleEndian |
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123 case endian == wkb.XDR: |
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124 order = binary.BigEndian |
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125 default: |
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126 return fmt.Errorf("unknown byte order %x", endian) |
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127 } |
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128 |
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129 err = binary.Read(r, order, &geomType) |
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130 switch { |
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131 case err != nil: |
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132 return err |
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133 case geomType != wkb.TriangleZ: |
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134 return fmt.Errorf("unknown geometry type %d", geomType) |
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135 } |
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136 |
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137 var rings uint32 |
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138 if err = binary.Read(r, order, &rings); err != nil { |
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139 return err |
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140 } |
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141 triangle := allocIndices() |
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142 |
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143 for ring := uint32(0); ring < rings; ring++ { |
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144 var npoints uint32 |
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145 if err = binary.Read(r, order, &npoints); err != nil { |
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146 return err |
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147 } |
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148 |
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149 if npoints < 3 { |
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150 return errTooLessPoints |
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151 } |
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152 |
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153 for p := uint32(0); p < npoints; p++ { |
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154 var x, y, z uint64 |
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155 for _, addr := range []*uint64{&x, &y, &z} { |
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156 if err = binary.Read(r, order, addr); err != nil { |
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157 return err |
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158 } |
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159 } |
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160 if p >= 3 || ring >= 1 { |
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161 // Don't store the forth point. |
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162 continue |
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163 } |
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164 // Do this conversion later to spare reflect calls |
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165 // and allocs in binary.Read. |
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166 v.X = math.Float64frombits(x) |
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167 v.Y = math.Float64frombits(y) |
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168 v.Z = math.Float64frombits(z) |
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169 idx, found := v2i[v] |
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170 if !found { |
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171 idx = int32(len(vertices)) |
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172 v2i[v] = idx |
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173 vertices = append(vertices, v) |
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174 min.Minimize(v) |
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175 max.Maximize(v) |
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176 } |
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177 triangle[p] = idx |
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178 } |
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179 } |
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180 triangles = append(triangles, triangle) |
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181 } |
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182 |
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183 log.Printf("info: bbox: [[%f, %f], [%f, %f]]\n", |
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184 min.X, min.Y, max.X, max.Y) |
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185 |
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186 *t = Tin{ |
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187 EPSG: models.WGS84, |
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188 Vertices: vertices, |
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189 Triangles: triangles, |
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190 Min: min, |
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191 Max: max, |
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192 } |
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193 |
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194 return nil |
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195 } |
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196 |
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197 // Scan implements the sql.Scanner interface. |
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198 func (t *Tin) Scan(raw interface{}) error { |
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199 if raw == nil { |
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200 return nil |
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201 } |
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202 data, ok := raw.([]byte) |
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203 if !ok { |
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204 return errNoByteSlice |
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205 } |
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206 return t.FromWKB(data) |
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207 } |
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208 |
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209 func (t *Tin) serialize(w io.Writer) error { |
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210 |
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211 if err := binary.Write(w, binary.LittleEndian, t.EPSG); err != nil { |
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212 return err |
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213 } |
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214 |
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215 if err := t.Min.Write(w); err != nil { |
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216 return err |
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217 } |
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218 if err := t.Max.Write(w); err != nil { |
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219 return err |
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220 } |
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221 |
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222 if err := binary.Write( |
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223 w, binary.LittleEndian, uint32(len(t.Vertices))); err != nil { |
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224 return err |
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225 } |
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226 |
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227 var err error |
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228 vwrite := func(v float64) { |
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229 if err == nil { |
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230 err = binary.Write(w, binary.LittleEndian, math.Float64bits(v)) |
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231 } |
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232 } |
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233 |
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234 for _, v := range t.Vertices { |
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235 vwrite(v.X) |
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236 vwrite(v.Y) |
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237 vwrite(v.Z) |
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238 } |
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239 |
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240 if err != nil { |
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241 return err |
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242 } |
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243 log.Printf("info: vertices %d (%d)\n", len(t.Vertices), len(t.Vertices)*3*8) |
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244 |
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245 if err := binary.Write( |
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246 w, binary.LittleEndian, uint32(len(t.Triangles))); err != nil { |
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247 return err |
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248 } |
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249 |
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250 var buf [binary.MaxVarintLen32]byte |
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251 var written int |
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252 var last int32 |
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253 for _, triangle := range t.Triangles { |
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254 for _, idx := range triangle { |
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255 value := idx - last |
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256 n := binary.PutVarint(buf[:], int64(value)) |
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257 for p := buf[:n]; len(p) > 0; p = p[n:] { |
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258 var err error |
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259 if n, err = w.Write(p); err != nil { |
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260 return err |
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261 } |
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262 written += n |
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263 } |
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264 last = idx |
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265 } |
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266 } |
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267 log.Printf("info: compressed tin indices in bytes: %d (%d)\n", |
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268 written, 3*4*len(t.Triangles)) |
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269 |
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270 return nil |
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271 } |