Mercurial > gemma

annotate pkg/imports/wkb.go @ 1860:f54ac71db1ac

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Importer: Added point geoemtry to wkb datatypes.
author Raimund Renkert <raimund.renkert@intevation.de>
date Thu, 17 Jan 2019 13:14:32 +0100
parents 09349ca27dd7
children 63475c8e710e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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
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25 type (
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26 pointSlice []float64
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27 lineSlice [][]float64
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28 polygonSlice [][][]float64
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29 )
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30
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31 const (
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32 wkbNDR byte = 1
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33
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34 wkbPoint uint32 = 1
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35 wkbLineString uint32 = 2
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36 wkbPolygon uint32 = 3
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37 )
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38
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39 func (l lineSlice) asWKB() []byte {
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40
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41 size := 1 + 4 + 4 + len(l)*(2*8)
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42
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43 buf := bytes.NewBuffer(make([]byte, 0, size))
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44
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45 binary.Write(buf, binary.LittleEndian, wkbNDR)
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46 binary.Write(buf, binary.LittleEndian, wkbLineString)
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47 binary.Write(buf, binary.LittleEndian, uint32(len(l)))
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48
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49 for _, c := range l {
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50 var lat, lon float64
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51 if len(c) > 0 {
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52 lat = c[0]
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53 }
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54 if len(c) > 1 {
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55 lon = c[1]
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56 }
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57 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
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58 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
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59 }
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60
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61 return buf.Bytes()
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62 }
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63
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64 func (p pointSlice) asWKB() []byte {
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65
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66 size := 1 + 4 + 2*8
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67
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68 buf := bytes.NewBuffer(make([]byte, 0, size))
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69
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70 binary.Write(buf, binary.LittleEndian, wkbNDR)
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71 binary.Write(buf, binary.LittleEndian, wkbPoint)
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72
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73 var lat, lon float64
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74 if len(p) > 0 {
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75 lat = p[0]
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76 }
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77 if len(p) > 1 {
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78 lon = p[1]
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79 }
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80 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
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81 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
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82
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83 return buf.Bytes()
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84 }
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85
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86 func (p polygonSlice) asWKB() []byte {
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87 if p == nil {
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88 return nil
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89 }
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90 // pre-calculate size to avoid reallocations.
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91 size := 1 + 4 + 4
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92 for _, ring := range p {
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93 size += 4 + len(ring)*2*8
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94 }
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95
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96 buf := bytes.NewBuffer(make([]byte, 0, size))
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97
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98 binary.Write(buf, binary.LittleEndian, wkbNDR)
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99 binary.Write(buf, binary.LittleEndian, wkbPolygon)
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100 binary.Write(buf, binary.LittleEndian, uint32(len(p)))
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101
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102 for _, ring := range p {
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103 binary.Write(buf, binary.LittleEndian, uint32(len(ring)))
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104 for _, v := range ring {
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105 var lat, lon float64
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106 if len(v) > 0 {
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107 lat = v[0]
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108 }
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109 if len(v) > 1 {
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110 lon = v[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 }
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116
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117 return buf.Bytes()
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118 }
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119
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120 func shapeToPolygon(s shp.Shape) (polygonSlice, error) {
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121 switch p := s.(type) {
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122 case *shp.Polygon:
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123 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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124 case *shp.PolygonZ:
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125 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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126 case *shp.PolygonM:
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127 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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128 }
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129 return nil, fmt.Errorf("Unsupported shape type %T", s)
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130 }
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131
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132 func toPolygon(numParts int32, parts []int32, points []shp.Point) polygonSlice {
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133 out := make(polygonSlice, numParts)
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134 var pos int32
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135
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136 for i := range out {
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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137 var howMany int32
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Sascha L. Teichmann <teichmann@intevation.de>
parents:
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138 if i+1 >= len(parts) {
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
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139 howMany = int32(len(points)) - pos
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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140 } else {
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
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141 howMany = parts[i+1] - parts[i]
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
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142 }
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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143
1786
09349ca27dd7 Imports: Removed duplicated code path to store WKB polygons into database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1785
diff changeset
144 line := make([][]float64, howMany)
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1785
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145 vertices := make([]float64, 2*howMany)
1785
614c6c766691 Waterway area import: Implemented.
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parents:
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146 for j := int32(0); j < howMany; j, pos = j+1, pos+1 {
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
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147 p := &points[pos]
1786
09349ca27dd7 Imports: Removed duplicated code path to store WKB polygons into database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1785
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148 vertex := vertices[j*2 : j*2+2]
09349ca27dd7 Imports: Removed duplicated code path to store WKB polygons into database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1785
diff changeset
149 vertex[0], vertex[1] = p.X, p.Y
09349ca27dd7 Imports: Removed duplicated code path to store WKB polygons into database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1785
diff changeset
150 line[j] = vertex
1785
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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151 }
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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152 out[i] = line
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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153 }
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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154 return out
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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155 }