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annotate pkg/mesh/tin.go @ 5601:1222b777f51f

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Made golint finally happy.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Sat, 06 Aug 2022 02:09:57 +0200
parents 5f47eeea988d
children b8da63027b48
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rev   line source
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 "math"
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23
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24 "gemma.intevation.de/gemma/pkg/log"
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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 // Clip returns a map of ids of triangles which are not inside the
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50 // given polygon.
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51 func (t *Tin) Clip(polygon *Polygon) map[int32]struct{} {
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52 var tree STRTree
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53 tree.Build(t)
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54 return tree.Clip(polygon)
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55 }
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56
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57 // FromWKB constructs the TIN from a WKB representation.
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58 // Shared vertices are identified and referenced by the
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59 // same index.
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60 func (t *Tin) FromWKB(data []byte) error {
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61 log.Infof("data length %d\n", len(data))
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62
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63 r := bytes.NewReader(data)
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64
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65 endian, err := r.ReadByte()
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66
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67 var order binary.ByteOrder
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68
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69 switch {
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70 case err != nil:
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71 return err
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72 case endian == wkb.NDR:
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73 order = binary.LittleEndian
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74 case endian == wkb.XDR:
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75 order = binary.BigEndian
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76 default:
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77 return fmt.Errorf("unknown byte order %x", endian)
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78 }
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79
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80 var geomType uint32
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81 err = binary.Read(r, order, &geomType)
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82
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83 switch {
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84 case err != nil:
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85 return err
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86 case geomType != wkb.TinZ:
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87 return fmt.Errorf("unknown geometry type %x", geomType)
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88 }
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89
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90 var num uint32
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91 if err = binary.Read(r, order, &num); err != nil {
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92 return err
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93 }
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94
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95 vertices := make([]Vertex, 0, 100000)
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96
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97 var v Vertex
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98
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99 v2i := make(map[Vertex]int32, 100000)
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100
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101 var indexPool []int32
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102
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103 allocIndices := func() []int32 {
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104 if len(indexPool) == 0 {
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105 indexPool = make([]int32, 3*8*1024)
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106 }
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107 ids := indexPool[:3]
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108 indexPool = indexPool[3:]
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109 return ids
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110 }
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111
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112 var triangles [][]int32
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113
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114 min := Vertex{math.MaxFloat64, math.MaxFloat64, math.MaxFloat64}
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115 max := Vertex{-math.MaxFloat64, -math.MaxFloat64, -math.MaxFloat64}
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116
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117 for i := uint32(0); i < num; i++ {
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118
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119 endian, err = r.ReadByte()
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120 switch {
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121 case err != nil:
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122 return err
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123 case endian == wkb.NDR:
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124 order = binary.LittleEndian
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125 case endian == wkb.XDR:
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126 order = binary.BigEndian
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127 default:
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128 return fmt.Errorf("unknown byte order %x", endian)
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129 }
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130
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131 err = binary.Read(r, order, &geomType)
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132 switch {
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133 case err != nil:
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134 return err
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135 case geomType != wkb.TriangleZ:
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136 return fmt.Errorf("unknown geometry type %d", geomType)
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137 }
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138
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139 var rings uint32
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140 if err = binary.Read(r, order, &rings); err != nil {
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141 return err
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142 }
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143 triangle := allocIndices()
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144
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145 for ring := uint32(0); ring < rings; ring++ {
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146 var npoints uint32
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147 if err = binary.Read(r, order, &npoints); err != nil {
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148 return err
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149 }
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150
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151 if npoints < 3 {
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152 return errTooLessPoints
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153 }
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154
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155 for p := uint32(0); p < npoints; p++ {
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parents:
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156 var x, y, z uint64
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157 for _, addr := range []*uint64{&x, &y, &z} {
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158 if err = binary.Read(r, order, addr); err != nil {
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parents:
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159 return err
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parents:
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160 }
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parents:
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161 }
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162 if p >= 3 || ring >= 1 {
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parents:
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163 // Don't store the forth point.
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parents:
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164 continue
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165 }
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parents:
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166 // Do this conversion later to spare reflect calls
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parents:
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167 // and allocs in binary.Read.
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parents:
diff changeset
168 v.X = math.Float64frombits(x)
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parents:
diff changeset
169 v.Y = math.Float64frombits(y)
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parents:
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170 v.Z = math.Float64frombits(z)
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parents:
diff changeset
171 idx, found := v2i[v]
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parents:
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172 if !found {
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173 idx = int32(len(vertices))
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174 v2i[v] = idx
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diff changeset
175 vertices = append(vertices, v)
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parents:
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176 min.Minimize(v)
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parents:
diff changeset
177 max.Maximize(v)
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diff changeset
178 }
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179 triangle[p] = idx
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parents:
diff changeset
180 }
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parents:
diff changeset
181 }
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diff changeset
182 triangles = append(triangles, triangle)
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parents:
diff changeset
183 }
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diff changeset
184
5490
5f47eeea988d Use own logging package.
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parents: 4847
diff changeset
185 log.Infof("bbox: [[%f, %f], [%f, %f]]\n",
968
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diff changeset
186 min.X, min.Y, max.X, max.Y)
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187
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diff changeset
188 *t = Tin{
1373
84e78d2e2d95 Backend: Centralized the definition of WGS84 constant in the models package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1328
diff changeset
189 EPSG: models.WGS84,
968
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190 Vertices: vertices,
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191 Triangles: triangles,
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diff changeset
192 Min: min,
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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diff changeset
193 Max: max,
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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diff changeset
194 }
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195
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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diff changeset
196 return nil
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diff changeset
197 }
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198
1692
f4dcbe8941a1 Octree: Resolved the remaing golint issues with this package.
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parents: 1691
diff changeset
199 // Scan implements the sql.Scanner interface.
968
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diff changeset
200 func (t *Tin) Scan(raw interface{}) error {
971
f9fb6c399f3f Moved generating of tins to octree package.
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parents: 968
diff changeset
201 if raw == nil {
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parents: 968
diff changeset
202 return nil
f9fb6c399f3f Moved generating of tins to octree package.
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parents: 968
diff changeset
203 }
968
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diff changeset
204 data, ok := raw.([]byte)
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diff changeset
205 if !ok {
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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diff changeset
206 return errNoByteSlice
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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diff changeset
207 }
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diff changeset
208 return t.FromWKB(data)
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diff changeset
209 }
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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parents:
diff changeset
210
1691
de09bd3b5c05 Octree: Fixed a few golint quirks and normalized logging a bit.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 1373
diff changeset
211 func (t *Tin) serialize(w io.Writer) error {
968
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diff changeset
212
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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parents:
diff changeset
213 if err := binary.Write(w, binary.LittleEndian, t.EPSG); err != nil {
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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parents:
diff changeset
214 return err
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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parents:
diff changeset
215 }
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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parents:
diff changeset
216
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
217 if err := t.Min.Write(w); err != nil {
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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parents:
diff changeset
218 return err
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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parents:
diff changeset
219 }
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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parents:
diff changeset
220 if err := t.Max.Write(w); err != nil {
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
221 return err
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
222 }
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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parents:
diff changeset
223
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
224 if err := binary.Write(
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
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parents:
diff changeset
225 w, binary.LittleEndian, uint32(len(t.Vertices))); err != nil {
a4fe07a21ba7 Moved octree builder into octree package to be reusable by the sounding result import job.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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226 return err
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227 }
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228
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229 var err error
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230 vwrite := func(v float64) {
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231 if err == nil {
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232 err = binary.Write(w, binary.LittleEndian, math.Float64bits(v))
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233 }
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234 }
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235
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236 for _, v := range t.Vertices {
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237 vwrite(v.X)
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238 vwrite(v.Y)
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239 vwrite(v.Z)
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240 }
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241
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242 if err != nil {
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243 return err
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244 }
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245 log.Infof("vertices %d (%d)\n", len(t.Vertices), len(t.Vertices)*3*8)
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246
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247 if err := binary.Write(
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248 w, binary.LittleEndian, uint32(len(t.Triangles))); err != nil {
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249 return err
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250 }
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251
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252 var buf [binary.MaxVarintLen32]byte
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253 var written int
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254 var last int32
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255 for _, triangle := range t.Triangles {
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256 for _, idx := range triangle {
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257 value := idx - last
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258 n := binary.PutVarint(buf[:], int64(value))
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259 for p := buf[:n]; len(p) > 0; p = p[n:] {
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260 var err error
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261 if n, err = w.Write(p); err != nil {
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262 return err
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263 }
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264 written += n
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265 }
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266 last = idx
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267 }
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268 }
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269 log.Infof("compressed tin indices in bytes: %d (%d)\n",
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270 written, 3*4*len(t.Triangles))
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271
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272 return nil
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273 }