Mercurial > gemma

annotate pkg/imports/wkb.go @ 5008:0b97f5301a17

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Add a multiLineSlice type to be serialized as WKB in importers.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 11 Mar 2020 15:54:37 +0100
parents 799e8248de8d
children cf25b23e3eec
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 )
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33
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34 func newPointFeature(newProperties func() interface{}) func() (string, interface{}) {
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35 return func() (string, interface{}) { return "Point", newProperties() }
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36 }
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37
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38 func (ls lineSlice) toWKB(buf *bytes.Buffer) {
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39 binary.Write(buf, binary.LittleEndian, wkb.NDR)
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40 binary.Write(buf, binary.LittleEndian, wkb.LineString)
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41 binary.Write(buf, binary.LittleEndian, uint32(len(ls)))
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42
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43 for _, c := range ls {
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44 var lat, lon float64
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45 if len(c) > 0 {
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46 lat = c[0]
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47 }
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48 if len(c) > 1 {
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49 lon = c[1]
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50 }
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51 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
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52 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
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53 }
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54 }
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55
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56 func (ls lineSlice) asWKB() []byte {
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57
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58 size := 1 + 4 + 4 + len(ls)*(2*8)
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59
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60 buf := bytes.NewBuffer(make([]byte, 0, size))
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61 ls.toWKB(buf)
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62
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63 return buf.Bytes()
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64 }
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65
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66 func (ls lineSlice) LinearRingGeom() wkb.LinearRingGeom {
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67 lr := make(wkb.LinearRingGeom, len(ls))
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68 for i, v := range ls {
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69 lr[i].X = v[0]
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70 lr[i].Y = v[1]
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71 }
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72 return lr
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73 }
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74
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75 func (mls multiLineSlice) asWKB() []byte {
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76
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77 size := 1 + 4 + 4
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78
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79 for _, ls := range mls {
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80 size += 1 + 4 + 4 + len(ls)*(2*8)
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81 }
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82
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83 buf := bytes.NewBuffer(make([]byte, 0, size))
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84
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85 binary.Write(buf, binary.LittleEndian, wkb.NDR)
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86 binary.Write(buf, binary.LittleEndian, wkb.MultiLineString)
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87 binary.Write(buf, binary.LittleEndian, uint32(len(mls)))
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88
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89 for _, ls := range mls {
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90 ls.toWKB(buf)
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91 }
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92
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93 return buf.Bytes()
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94 }
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95
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96 func (p pointSlice) asWKB() []byte {
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97
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98 size := 1 + 4 + 2*8
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99
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100 buf := bytes.NewBuffer(make([]byte, 0, size))
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101
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102 binary.Write(buf, binary.LittleEndian, wkb.NDR)
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103 binary.Write(buf, binary.LittleEndian, wkb.Point)
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104
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105 var lat, lon float64
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106 if len(p) > 0 {
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107 lat = p[0]
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108 }
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109 if len(p) > 1 {
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110 lon = p[1]
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111 }
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112 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
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113 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
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114
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115 return buf.Bytes()
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116 }
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117
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118 func (ps polygonSlice) asWKB() []byte {
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119 if ps == nil {
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120 return nil
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121 }
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122 // pre-calculate size to avoid reallocations.
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123 size := 1 + 4 + 4
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124 for _, ring := range ps {
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125 size += 4 + len(ring)*2*8
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126 }
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127
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128 buf := bytes.NewBuffer(make([]byte, 0, size))
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129
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130 binary.Write(buf, binary.LittleEndian, wkb.NDR)
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131 binary.Write(buf, binary.LittleEndian, wkb.Polygon)
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132 binary.Write(buf, binary.LittleEndian, uint32(len(ps)))
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133
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134 for _, ring := range ps {
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135 binary.Write(buf, binary.LittleEndian, uint32(len(ring)))
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136 for _, v := range ring {
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137 var lat, lon float64
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138 if len(v) > 0 {
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139 lat = v[0]
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140 }
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141 if len(v) > 1 {
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142 lon = v[1]
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143 }
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144 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
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145 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
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146 }
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147 }
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148
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149 return buf.Bytes()
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150 }
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151
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152 func shapeToPolygon(s shp.Shape) (polygonSlice, error) {
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153 switch p := s.(type) {
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154 case *shp.Polygon:
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155 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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156 case *shp.PolygonZ:
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157 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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158 case *shp.PolygonM:
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159 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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160 }
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161 return nil, fmt.Errorf("unsupported shape type %T", s)
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162 }
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163
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164 func toPolygon(numParts int32, parts []int32, points []shp.Point) polygonSlice {
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165 out := make(polygonSlice, numParts)
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166 var pos int32
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167
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168 for i := range out {
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169 var howMany int32
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170 if i+1 >= len(parts) {
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171 howMany = int32(len(points)) - pos
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172 } else {
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173 howMany = parts[i+1] - parts[i]
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174 }
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175
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176 line := make([][]float64, howMany)
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177 vertices := make([]float64, 2*howMany)
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178 for j := int32(0); j < howMany; j, pos = j+1, pos+1 {
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179 p := &points[pos]
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180 vertex := vertices[j*2 : j*2+2]
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181 vertex[0], vertex[1] = p.X, p.Y
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182 line[j] = vertex
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183 }
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184 out[i] = line
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185 }
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186 return out
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187 }
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188
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189 func (ps polygonSlice) MultiPolygonGeom() wkb.MultiPolygonGeom {
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190
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191 var mp wkb.MultiPolygonGeom
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192 var curr wkb.PolygonGeom
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193
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194 for _, r := range ps {
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195 lr := lineSlice(r).LinearRingGeom()
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196 // A counter clockwise ring starts a new polygon.
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197 if lr.CCW() {
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198 if len(curr) > 0 {
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199 mp = append(mp, curr)
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200 curr = wkb.PolygonGeom{}
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201 }
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202 }
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203 curr = append(curr, lr)
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204 }
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205
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diff changeset
206 if len(curr) > 0 {
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diff changeset
207 mp = append(mp, curr)
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208 }
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209
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210 return mp
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diff changeset
211 }