Mercurial > gemma
annotate pkg/imports/wkb.go @ 5624:29d729607ac1
Added tag v5.7 for changeset ff0af91a7f62
author | Sascha Wilde <wilde@sha-bang.de> |
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date | Thu, 22 Dec 2022 18:42:14 +0100 |
parents | 41a67619c170 |
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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 imports |
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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 "fmt" |
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20 "math" |
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21 |
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22 shp "github.com/jonas-p/go-shp" |
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23 |
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24 "gemma.intevation.de/gemma/pkg/wkb" |
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25 ) |
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26 |
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27 type ( |
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28 pointSlice []float64 |
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29 lineSlice [][]float64 |
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30 multiLineSlice []lineSlice |
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31 polygonSlice [][][]float64 |
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32 multiPolygonSlice []polygonSlice |
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33 ) |
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34 |
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35 func newPointFeature(newProperties func() interface{}) func() (string, interface{}) { |
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36 return func() (string, interface{}) { return "Point", newProperties() } |
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37 } |
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38 |
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39 func newMultiLineFeature( |
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40 newProperties func() interface{}, |
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41 ) func() (string, interface{}) { |
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42 return func() (string, interface{}) { |
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43 return "MultiLineString", newProperties() |
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44 } |
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45 } |
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46 |
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47 func (ls lineSlice) toWKB(buf *bytes.Buffer) { |
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48 binary.Write(buf, binary.LittleEndian, wkb.NDR) |
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49 binary.Write(buf, binary.LittleEndian, wkb.LineString) |
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50 binary.Write(buf, binary.LittleEndian, uint32(len(ls))) |
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51 |
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52 for _, c := range ls { |
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53 var lat, lon float64 |
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54 if len(c) > 0 { |
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55 lat = c[0] |
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56 } |
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57 if len(c) > 1 { |
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58 lon = c[1] |
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59 } |
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60 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat)) |
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61 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon)) |
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62 } |
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63 } |
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64 |
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65 func (ls lineSlice) asWKB() []byte { |
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66 |
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67 size := 1 + 4 + 4 + len(ls)*(2*8) |
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68 |
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69 buf := bytes.NewBuffer(make([]byte, 0, size)) |
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70 ls.toWKB(buf) |
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71 |
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72 return buf.Bytes() |
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73 } |
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74 |
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75 func (ls lineSlice) LinearRingGeom() wkb.LinearRingGeom { |
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76 lr := make(wkb.LinearRingGeom, len(ls)) |
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77 for i, v := range ls { |
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78 lr[i].X = v[0] |
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79 lr[i].Y = v[1] |
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80 } |
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81 return lr |
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82 } |
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83 |
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84 func (mls multiLineSlice) asWKB() []byte { |
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85 |
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86 size := 1 + 4 + 4 |
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87 |
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88 for _, ls := range mls { |
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89 size += 1 + 4 + 4 + len(ls)*(2*8) |
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90 } |
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91 |
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92 buf := bytes.NewBuffer(make([]byte, 0, size)) |
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93 |
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94 binary.Write(buf, binary.LittleEndian, wkb.NDR) |
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95 binary.Write(buf, binary.LittleEndian, wkb.MultiLineString) |
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96 binary.Write(buf, binary.LittleEndian, uint32(len(mls))) |
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97 |
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98 for _, ls := range mls { |
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99 ls.toWKB(buf) |
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100 } |
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101 |
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102 return buf.Bytes() |
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103 } |
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104 |
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105 func (p pointSlice) asWKB() []byte { |
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106 |
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107 size := 1 + 4 + 2*8 |
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108 |
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109 buf := bytes.NewBuffer(make([]byte, 0, size)) |
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110 |
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111 binary.Write(buf, binary.LittleEndian, wkb.NDR) |
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112 binary.Write(buf, binary.LittleEndian, wkb.Point) |
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113 |
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114 var lat, lon float64 |
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115 if len(p) > 0 { |
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116 lat = p[0] |
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117 } |
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118 if len(p) > 1 { |
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119 lon = p[1] |
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120 } |
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121 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat)) |
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122 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon)) |
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123 |
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124 return buf.Bytes() |
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125 } |
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126 |
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127 func (ps polygonSlice) asWKB() []byte { |
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128 if ps == nil { |
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129 return nil |
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130 } |
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131 // pre-calculate size to avoid reallocations. |
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132 size := 1 + 4 + 4 |
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133 for _, ring := range ps { |
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134 size += 4 + len(ring)*2*8 |
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135 } |
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136 |
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137 buf := bytes.NewBuffer(make([]byte, 0, size)) |
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138 |
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139 binary.Write(buf, binary.LittleEndian, wkb.NDR) |
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140 binary.Write(buf, binary.LittleEndian, wkb.Polygon) |
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141 binary.Write(buf, binary.LittleEndian, uint32(len(ps))) |
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142 |
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143 for _, ring := range ps { |
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144 binary.Write(buf, binary.LittleEndian, uint32(len(ring))) |
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145 for _, v := range ring { |
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146 var lat, lon float64 |
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147 if len(v) > 0 { |
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148 lat = v[0] |
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149 } |
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150 if len(v) > 1 { |
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151 lon = v[1] |
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152 } |
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153 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat)) |
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154 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon)) |
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155 } |
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156 } |
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157 |
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158 return buf.Bytes() |
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159 } |
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160 |
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161 func shapeToPolygon(s shp.Shape) (polygonSlice, error) { |
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162 switch p := s.(type) { |
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163 case *shp.Polygon: |
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164 return toPolygon(p.NumParts, p.Parts, p.Points), nil |
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165 case *shp.PolygonZ: |
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166 return toPolygon(p.NumParts, p.Parts, p.Points), nil |
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167 case *shp.PolygonM: |
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168 return toPolygon(p.NumParts, p.Parts, p.Points), nil |
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169 } |
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170 return nil, fmt.Errorf("unsupported shape type %T", s) |
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171 } |
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172 |
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173 func toPolygon(numParts int32, parts []int32, points []shp.Point) polygonSlice { |
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174 out := make(polygonSlice, numParts) |
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175 var pos int32 |
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176 |
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177 for i := range out { |
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178 var howMany int32 |
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179 if i+1 >= len(parts) { |
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180 howMany = int32(len(points)) - pos |
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181 } else { |
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182 howMany = parts[i+1] - parts[i] |
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183 } |
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184 |
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185 line := make([][]float64, howMany) |
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186 vertices := make([]float64, 2*howMany) |
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187 for j := int32(0); j < howMany; j, pos = j+1, pos+1 { |
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188 p := &points[pos] |
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189 vertex := vertices[j*2 : j*2+2] |
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190 vertex[0], vertex[1] = p.X, p.Y |
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191 line[j] = vertex |
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192 } |
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193 out[i] = line |
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194 } |
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195 return out |
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196 } |
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197 |
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198 func (ps polygonSlice) MultiPolygonGeom() wkb.MultiPolygonGeom { |
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199 |
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200 var mp wkb.MultiPolygonGeom |
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201 var curr wkb.PolygonGeom |
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202 |
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203 for _, r := range ps { |
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204 lr := lineSlice(r).LinearRingGeom() |
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205 // A counter clockwise ring starts a new polygon. |
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206 if lr.CCW() { |
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207 if len(curr) > 0 { |
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208 mp = append(mp, curr) |
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209 curr = wkb.PolygonGeom{} |
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210 } |
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211 } |
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212 curr = append(curr, lr) |
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213 } |
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214 |
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215 if len(curr) > 0 { |
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216 mp = append(mp, curr) |
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217 } |
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218 |
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219 return mp |
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220 } |