Mercurial > gemma

annotate pkg/imports/wkb.go @ 4177:8b75ac5e243e

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Made 'staticcheck' happy with pgxutils package.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 05 Aug 2019 17:16:46 +0200
parents 63475c8e710e
children 5da02dcc51f6
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 (p pointSlice) asWKB() []byte {
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59
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60 size := 1 + 4 + 2*8
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61
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62 buf := bytes.NewBuffer(make([]byte, 0, size))
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63
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64 binary.Write(buf, binary.LittleEndian, wkb.NDR)
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65 binary.Write(buf, binary.LittleEndian, wkb.Point)
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66
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67 var lat, lon float64
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68 if len(p) > 0 {
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69 lat = p[0]
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70 }
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71 if len(p) > 1 {
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72 lon = p[1]
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73 }
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74 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
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75 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
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76
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77 return buf.Bytes()
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78 }
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79
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80 func (p polygonSlice) asWKB() []byte {
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81 if p == nil {
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82 return nil
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83 }
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84 // pre-calculate size to avoid reallocations.
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85 size := 1 + 4 + 4
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86 for _, ring := range p {
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87 size += 4 + len(ring)*2*8
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88 }
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89
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90 buf := bytes.NewBuffer(make([]byte, 0, size))
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91
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92 binary.Write(buf, binary.LittleEndian, wkb.NDR)
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93 binary.Write(buf, binary.LittleEndian, wkb.Polygon)
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94 binary.Write(buf, binary.LittleEndian, uint32(len(p)))
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95
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96 for _, ring := range p {
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97 binary.Write(buf, binary.LittleEndian, uint32(len(ring)))
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98 for _, v := range ring {
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99 var lat, lon float64
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100 if len(v) > 0 {
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101 lat = v[0]
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102 }
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103 if len(v) > 1 {
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104 lon = v[1]
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105 }
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106 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat))
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107 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon))
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108 }
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109 }
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110
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111 return buf.Bytes()
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112 }
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113
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114 func shapeToPolygon(s shp.Shape) (polygonSlice, error) {
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115 switch p := s.(type) {
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116 case *shp.Polygon:
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117 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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118 case *shp.PolygonZ:
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119 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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120 case *shp.PolygonM:
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121 return toPolygon(p.NumParts, p.Parts, p.Points), nil
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122 }
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123 return nil, fmt.Errorf("unsupported shape type %T", s)
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124 }
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125
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126 func toPolygon(numParts int32, parts []int32, points []shp.Point) polygonSlice {
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127 out := make(polygonSlice, numParts)
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128 var pos int32
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129
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130 for i := range out {
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131 var howMany int32
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132 if i+1 >= len(parts) {
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133 howMany = int32(len(points)) - pos
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134 } else {
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Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff changeset
135 howMany = parts[i+1] - parts[i]
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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136 }
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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137
1786
09349ca27dd7 Imports: Removed duplicated code path to store WKB polygons into database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1785
diff changeset
138 line := make([][]float64, howMany)
09349ca27dd7 Imports: Removed duplicated code path to store WKB polygons into database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 1785
diff changeset
139 vertices := make([]float64, 2*howMany)
1785
614c6c766691 Waterway area import: Implemented.
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parents:
diff changeset
140 for j := int32(0); j < howMany; j, pos = j+1, pos+1 {
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff changeset
141 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
diff changeset
142 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
143 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
144 line[j] = vertex
1785
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff changeset
145 }
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff changeset
146 out[i] = line
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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147 }
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff changeset
148 return out
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff changeset
149 }