Mercurial > gemma

annotate pkg/imports/wkb.go @ 4313:5da02dcc51f6

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shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 03 Sep 2019 16:54:33 +0200
parents 8b75ac5e243e
children 046a07a33b19
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 polygonSlice [][][]float64
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31 )
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32
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33 func (l lineSlice) asWKB() []byte {
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34
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35 size := 1 + 4 + 4 + len(l)*(2*8)
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36
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37 buf := bytes.NewBuffer(make([]byte, 0, size))
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38
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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(l)))
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42
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43 for _, c := range l {
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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 return buf.Bytes()
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56 }
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57
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58 func (ls lineSlice) LinearRingGeom() wkb.LinearRingGeom {
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59 lr := make(wkb.LinearRingGeom, len(ls))
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60 for i, v := range ls {
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61 lr[i].X = v[0]
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62 lr[i].Y = v[1]
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63 }
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64 return lr
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65 }
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66
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67 func (p pointSlice) asWKB() []byte {
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68
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69 size := 1 + 4 + 2*8
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70
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71 buf := bytes.NewBuffer(make([]byte, 0, size))
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72
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73 binary.Write(buf, binary.LittleEndian, wkb.NDR)
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74 binary.Write(buf, binary.LittleEndian, wkb.Point)
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75
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76 var lat, lon float64
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77 if len(p) > 0 {
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78 lat = p[0]
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79 }
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80 if len(p) > 1 {
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81 lon = p[1]
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82 }
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83 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
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84 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
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85
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86 return buf.Bytes()
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87 }
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88
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89 func (p polygonSlice) asWKB() []byte {
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90 if p == nil {
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91 return nil
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92 }
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93 // pre-calculate size to avoid reallocations.
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94 size := 1 + 4 + 4
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95 for _, ring := range p {
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96 size += 4 + len(ring)*2*8
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97 }
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98
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99 buf := bytes.NewBuffer(make([]byte, 0, size))
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100
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101 binary.Write(buf, binary.LittleEndian, wkb.NDR)
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102 binary.Write(buf, binary.LittleEndian, wkb.Polygon)
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103 binary.Write(buf, binary.LittleEndian, uint32(len(p)))
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104
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105 for _, ring := range p {
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106 binary.Write(buf, binary.LittleEndian, uint32(len(ring)))
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107 for _, v := range ring {
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108 var lat, lon float64
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109 if len(v) > 0 {
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110 lat = v[0]
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111 }
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112 if len(v) > 1 {
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113 lon = v[1]
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114 }
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115 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
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116 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
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117 }
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118 }
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119
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120 return buf.Bytes()
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121 }
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122
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123 func shapeToPolygon(s shp.Shape) (polygonSlice, error) {
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124 switch p := s.(type) {
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125 case *shp.Polygon:
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126 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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127 case *shp.PolygonZ:
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128 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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129 case *shp.PolygonM:
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130 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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131 }
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132 return nil, fmt.Errorf("unsupported shape type %T", s)
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133 }
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134
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135 func toPolygon(numParts int32, parts []int32, points []shp.Point) polygonSlice {
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136 out := make(polygonSlice, numParts)
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137 var pos int32
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138
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139 for i := range out {
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140 var howMany int32
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141 if i+1 >= len(parts) {
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142 howMany = int32(len(points)) - pos
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143 } else {
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144 howMany = parts[i+1] - parts[i]
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145 }
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146
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147 line := make([][]float64, howMany)
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148 vertices := make([]float64, 2*howMany)
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149 for j := int32(0); j < howMany; j, pos = j+1, pos+1 {
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150 p := &points[pos]
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151 vertex := vertices[j*2 : j*2+2]
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152 vertex[0], vertex[1] = p.X, p.Y
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153 line[j] = vertex
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154 }
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155 out[i] = line
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156 }
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157 return out
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158 }
4313
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
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159
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160 func (ps polygonSlice) MultiPolygonGeom() wkb.MultiPolygonGeom {
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161
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162 var mp wkb.MultiPolygonGeom
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163 var curr wkb.PolygonGeom
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164
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165 for _, r := range ps {
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166 lr := lineSlice(r).LinearRingGeom()
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167 // A counter clockwise ring starts a new polygon.
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168 if lr.CCW() {
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169 if len(curr) > 0 {
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170 mp = append(mp, curr)
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171 curr = wkb.PolygonGeom{}
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172 }
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173 }
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174 curr = append(curr, lr)
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175 }
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176
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177 if len(curr) > 0 {
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178 mp = append(mp, curr)
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179 }
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180
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181 return mp
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182 }