Mercurial > gemma
annotate pkg/octree/tin.go @ 4488:bff6c5c1db4f
client: pdf-gen: improve adding bottleneck info to pdf
* Check if the bottleneck is in the current view to add its info to the exported pdf and the pdf filename, this avoid wrong filename and wrong info in pdf in case view has been changed to another location.
* Set the bottleneck to print after moving to it in map.
author | Fadi Abbud <fadi.abbud@intevation.de> |
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date | Fri, 27 Sep 2019 11:15:02 +0200 |
parents | 59e7a011d347 |
children | f5492fda097c |
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) 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 octree |
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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 for _, v := range t.Vertices { |
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228 if err := v.Write(w); err != nil { |
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229 return err |
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230 } |
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231 } |
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232 log.Printf("info: vertices %d (%d)\n", len(t.Vertices), len(t.Vertices)*3*8) |
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233 |
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234 if err := binary.Write( |
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235 w, binary.LittleEndian, uint32(len(t.Triangles))); err != nil { |
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236 return err |
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237 } |
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238 |
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239 var buf [binary.MaxVarintLen32]byte |
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240 var written int |
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241 var last int32 |
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242 for _, triangle := range t.Triangles { |
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243 for _, idx := range triangle { |
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244 value := idx - last |
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245 n := binary.PutVarint(buf[:], int64(value)) |
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246 for p := buf[:n]; len(p) > 0; p = p[n:] { |
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247 var err error |
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248 if n, err = w.Write(p); err != nil { |
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249 return err |
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250 } |
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251 written += n |
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252 } |
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253 last = idx |
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254 } |
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255 } |
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256 log.Printf("info: compressed tin indices in bytes: %d (%d)\n", |
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257 written, 3*4*len(t.Triangles)) |
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258 |
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259 return nil |
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260 } |