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annotate pkg/wkb/data.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 3d6941046858
children c3b5cf2f200a
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) 2019 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 wkb
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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
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23 type (
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24 PointGeom struct {
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25 X float64
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26 Y float64
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27 }
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28 LinearRingGeom []PointGeom
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29 PolygonGeom []LinearRingGeom
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30 MultiPolygonGeom []PolygonGeom
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31 )
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32
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33 func (mpg *MultiPolygonGeom) FromWKB(data []byte) error {
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34 r := bytes.NewReader(data)
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35
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36 var order binary.ByteOrder
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37
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38 switch endian, err := r.ReadByte(); {
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39 case err != nil:
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40 return err
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41 case endian == NDR:
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42 order = binary.LittleEndian
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43 case endian == XDR:
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44 order = binary.BigEndian
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45 default:
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46 return fmt.Errorf("unknown byte order %x", endian)
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47 }
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48
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49 var geomType uint32
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50
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51 switch err := binary.Read(r, order, &geomType); {
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52 case err != nil:
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53 return err
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54 case geomType != MultiPolygon:
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55 return fmt.Errorf("unknown geometry type %x", geomType)
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56 }
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57
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58 var numPolygons int32
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59 if err := binary.Read(r, order, &numPolygons); err != nil {
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60 return err
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61 }
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62
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63 polygons := make([]PolygonGeom, numPolygons)
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64
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65 for i := range polygons {
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66 switch endian, err := r.ReadByte(); {
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67 case err != nil:
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68 return err
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69 case endian == NDR:
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70 order = binary.LittleEndian
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71 case endian == XDR:
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72 order = binary.BigEndian
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73 default:
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74 return fmt.Errorf("unknown byte order %x", endian)
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75 }
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76
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77 switch err := binary.Read(r, order, &geomType); {
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78 case err != nil:
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79 return err
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80 case geomType != Polygon:
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81 return fmt.Errorf("unknown geometry type %x", geomType)
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82 }
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83
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84 var numRings uint32
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85 if err := binary.Read(r, order, &numRings); err != nil {
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86 return err
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87 }
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88
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89 rings := make([]LinearRingGeom, numRings)
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90
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91 for j := range rings {
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92 var numPoints uint32
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93 if err := binary.Read(r, order, &numPoints); err != nil {
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94 return err
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95 }
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96 points := make([]PointGeom, numPoints)
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97
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98 for k := range points {
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99 var x, y uint64
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100 if err := binary.Read(r, order, &x); err != nil {
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101 return err
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102 }
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103 if err := binary.Read(r, order, &y); err != nil {
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104 return err
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105 }
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106 points[k] = PointGeom{
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107 X: math.Float64frombits(x),
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108 Y: math.Float64frombits(y),
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109 }
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110 }
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111 rings[j] = points
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112 }
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113 polygons[i] = rings
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114 }
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115
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116 *mpg = polygons
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117 return nil
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118 }
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119
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120 func (lr LinearRingGeom) CCW() bool {
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121 var sum float64
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122 for i, v1 := range lr {
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123 v2 := lr[(i+1)%len(lr)]
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124 sum += (v2.X - v1.X) * (v2.Y + v1.Y)
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4310
diff changeset
125 }
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4310
diff changeset
126 return sum > 0
5da02dcc51f6 shape upload stretch import: Started to decode geometries and attributes from uploaded shape file.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4310
diff changeset
127 }