Mercurial > gemma

annotate pkg/imports/wkb.go @ 5016:cf25b23e3eec

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Keep historic data of waterway axis ... and accordingly configure the respective layer as WMS-T.
author Tom Gottfried <tom@intevation.de>
date Fri, 13 Mar 2020 17:34:59 +0100
parents 0b97f5301a17
children 41a67619c170
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 newMultiLineFeature(
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39 newProperties func() interface{},
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40 ) func() (string, interface{}) {
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41 return func() (string, interface{}) {
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42 return "MultiLineString", newProperties()
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43 }
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44 }
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45
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46 func (ls lineSlice) toWKB(buf *bytes.Buffer) {
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47 binary.Write(buf, binary.LittleEndian, wkb.NDR)
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48 binary.Write(buf, binary.LittleEndian, wkb.LineString)
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49 binary.Write(buf, binary.LittleEndian, uint32(len(ls)))
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50
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51 for _, c := range ls {
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52 var lat, lon float64
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53 if len(c) > 0 {
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54 lat = c[0]
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55 }
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56 if len(c) > 1 {
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57 lon = c[1]
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58 }
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59 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
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60 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
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61 }
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62 }
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63
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64 func (ls lineSlice) asWKB() []byte {
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65
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66 size := 1 + 4 + 4 + len(ls)*(2*8)
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67
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68 buf := bytes.NewBuffer(make([]byte, 0, size))
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69 ls.toWKB(buf)
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70
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71 return buf.Bytes()
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72 }
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73
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74 func (ls lineSlice) LinearRingGeom() wkb.LinearRingGeom {
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75 lr := make(wkb.LinearRingGeom, len(ls))
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76 for i, v := range ls {
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77 lr[i].X = v[0]
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78 lr[i].Y = v[1]
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79 }
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80 return lr
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81 }
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82
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83 func (mls multiLineSlice) asWKB() []byte {
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84
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85 size := 1 + 4 + 4
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86
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87 for _, ls := range mls {
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88 size += 1 + 4 + 4 + len(ls)*(2*8)
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89 }
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90
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91 buf := bytes.NewBuffer(make([]byte, 0, size))
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92
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93 binary.Write(buf, binary.LittleEndian, wkb.NDR)
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94 binary.Write(buf, binary.LittleEndian, wkb.MultiLineString)
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95 binary.Write(buf, binary.LittleEndian, uint32(len(mls)))
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96
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97 for _, ls := range mls {
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98 ls.toWKB(buf)
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99 }
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100
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101 return buf.Bytes()
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102 }
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103
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104 func (p pointSlice) asWKB() []byte {
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105
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106 size := 1 + 4 + 2*8
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107
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108 buf := bytes.NewBuffer(make([]byte, 0, size))
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109
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110 binary.Write(buf, binary.LittleEndian, wkb.NDR)
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111 binary.Write(buf, binary.LittleEndian, wkb.Point)
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112
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113 var lat, lon float64
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114 if len(p) > 0 {
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115 lat = p[0]
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116 }
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117 if len(p) > 1 {
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118 lon = p[1]
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119 }
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120 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
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121 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
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122
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123 return buf.Bytes()
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124 }
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125
4852
046a07a33b19 Fixed the golint issues of the imports package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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126 func (ps polygonSlice) asWKB() []byte {
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127 if ps == nil {
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128 return nil
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129 }
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130 // pre-calculate size to avoid reallocations.
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131 size := 1 + 4 + 4
4852
046a07a33b19 Fixed the golint issues of the imports package.
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132 for _, ring := range ps {
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133 size += 4 + len(ring)*2*8
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134 }
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135
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136 buf := bytes.NewBuffer(make([]byte, 0, size))
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137
2471
63475c8e710e Moved WKB constants to own package.
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138 binary.Write(buf, binary.LittleEndian, wkb.NDR)
63475c8e710e Moved WKB constants to own package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1860
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139 binary.Write(buf, binary.LittleEndian, wkb.Polygon)
4852
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140 binary.Write(buf, binary.LittleEndian, uint32(len(ps)))
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141
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142 for _, ring := range ps {
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143 binary.Write(buf, binary.LittleEndian, uint32(len(ring)))
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144 for _, v := range ring {
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Sascha L. Teichmann <teichmann@intevation.de>
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145 var lat, lon float64
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Sascha L. Teichmann <teichmann@intevation.de>
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146 if len(v) > 0 {
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Sascha L. Teichmann <teichmann@intevation.de>
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147 lat = v[0]
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148 }
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149 if len(v) > 1 {
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150 lon = v[1]
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151 }
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152 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
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153 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
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154 }
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155 }
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parents:
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156
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parents:
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157 return buf.Bytes()
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158 }
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159
1786
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1785
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160 func shapeToPolygon(s shp.Shape) (polygonSlice, error) {
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161 switch p := s.(type) {
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162 case *shp.Polygon:
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163 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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164 case *shp.PolygonZ:
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165 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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parents:
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166 case *shp.PolygonM:
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167 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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168 }
4177
8b75ac5e243e Made 'staticcheck' happy with pgxutils package.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2471
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169 return nil, fmt.Errorf("unsupported shape type %T", s)
1785
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170 }
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171
1786
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1785
diff changeset
172 func toPolygon(numParts int32, parts []int32, points []shp.Point) polygonSlice {
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diff changeset
173 out := make(polygonSlice, numParts)
1785
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174 var pos int32
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175
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parents:
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176 for i := range out {
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177 var howMany int32
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178 if i+1 >= len(parts) {
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179 howMany = int32(len(points)) - pos
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180 } else {
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181 howMany = parts[i+1] - parts[i]
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182 }
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183
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184 line := make([][]float64, howMany)
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185 vertices := make([]float64, 2*howMany)
1785
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parents:
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186 for j := int32(0); j < howMany; j, pos = j+1, pos+1 {
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diff changeset
187 p := &points[pos]
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188 vertex := vertices[j*2 : j*2+2]
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diff changeset
189 vertex[0], vertex[1] = p.X, p.Y
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diff changeset
190 line[j] = vertex
1785
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parents:
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191 }
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parents:
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192 out[i] = line
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parents:
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193 }
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parents:
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194 return out
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195 }
4313
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
196
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
197 func (ps polygonSlice) MultiPolygonGeom() wkb.MultiPolygonGeom {
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198
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199 var mp wkb.MultiPolygonGeom
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diff changeset
200 var curr wkb.PolygonGeom
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diff changeset
201
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parents: 4177
diff changeset
202 for _, r := range ps {
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
203 lr := lineSlice(r).LinearRingGeom()
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
204 // A counter clockwise ring starts a new polygon.
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
205 if lr.CCW() {
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
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parents: 4177
diff changeset
206 if len(curr) > 0 {
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
207 mp = append(mp, curr)
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
208 curr = wkb.PolygonGeom{}
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
209 }
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
210 }
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
211 curr = append(curr, lr)
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
212 }
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
213
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
214 if len(curr) > 0 {
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
215 mp = append(mp, curr)
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
216 }
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
217
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
218 return mp
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4177
diff changeset
219 }