Mercurial > gemma

annotate pkg/wkb/data.go @ 5361:ce1fe22bda5a extented-report

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Backed out changeset f845c3b7b68e
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 22 Jun 2021 17:12:17 +0200
parents 0ddb308fed37
children 1222b777f51f
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) AsWKB() []byte {
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34
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35 size := 1 + 4 + 4
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36 for _, pg := range mpg {
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37 size += 1 + 4 + 4
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38 for _, r := range pg {
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39 size += 4 + 2*8*len(r)
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40 }
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41 }
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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, NDR)
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46 binary.Write(buf, binary.LittleEndian, MultiPolygon)
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47 binary.Write(buf, binary.LittleEndian, uint32(len(mpg)))
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48
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49 for _, pg := range mpg {
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50 binary.Write(buf, binary.LittleEndian, NDR)
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51 binary.Write(buf, binary.LittleEndian, Polygon)
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52 binary.Write(buf, binary.LittleEndian, uint32(len(pg)))
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53
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54 for _, r := range pg {
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55 binary.Write(buf, binary.LittleEndian, uint32(len(r)))
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56 for _, p := range r {
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57 x := math.Float64bits(p.X)
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58 y := math.Float64bits(p.Y)
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59 binary.Write(buf, binary.LittleEndian, x)
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60 binary.Write(buf, binary.LittleEndian, y)
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61 }
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62 }
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63 }
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64
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65 return buf.Bytes()
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66 }
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67
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68 func (mpg *MultiPolygonGeom) FromWKB(data []byte) error {
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69 r := bytes.NewReader(data)
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70
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71 var order binary.ByteOrder
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72
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73 switch endian, err := r.ReadByte(); {
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74 case err != nil:
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75 return err
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76 case endian == NDR:
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77 order = binary.LittleEndian
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78 case endian == XDR:
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79 order = binary.BigEndian
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80 default:
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81 return fmt.Errorf("unknown byte order %x", endian)
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82 }
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83
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84 var geomType uint32
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85
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86 switch err := binary.Read(r, order, &geomType); {
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87 case err != nil:
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88 return err
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89 case geomType != MultiPolygon:
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90 return fmt.Errorf("unknown geometry type %x", geomType)
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91 }
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92
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93 var numPolygons uint32
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94 if err := binary.Read(r, order, &numPolygons); err != nil {
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95 return err
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96 }
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97
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98 polygons := make([]PolygonGeom, numPolygons)
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99
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100 for i := range polygons {
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101 switch endian, err := r.ReadByte(); {
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102 case err != nil:
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103 return err
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104 case endian == NDR:
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105 order = binary.LittleEndian
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106 case endian == XDR:
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107 order = binary.BigEndian
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108 default:
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109 return fmt.Errorf("unknown byte order %x", endian)
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110 }
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111
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112 switch err := binary.Read(r, order, &geomType); {
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113 case err != nil:
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114 return err
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115 case geomType != Polygon:
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116 return fmt.Errorf("unknown geometry type %x", geomType)
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117 }
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118
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119 var numRings uint32
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120 if err := binary.Read(r, order, &numRings); err != nil {
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121 return err
8b730ee6f17b Completed parsing multi polygons from WKB.
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parents: 4296
diff changeset
122 }
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
123
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
124 rings := make([]LinearRingGeom, numRings)
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
125
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
126 for j := range rings {
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
127 var numPoints uint32
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
128 if err := binary.Read(r, order, &numPoints); err != nil {
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
129 return err
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
130 }
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
131 points := make([]PointGeom, numPoints)
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
132
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
133 for k := range points {
4301
b333d48ae555 Tightend the parsing of x/y data of WKB multi polyons a bit.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4300
diff changeset
134 var x, y uint64
4300
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
135 if err := binary.Read(r, order, &x); err != nil {
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
136 return err
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
137 }
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
138 if err := binary.Read(r, order, &y); err != nil {
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
139 return err
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
140 }
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
141 points[k] = PointGeom{
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
142 X: math.Float64frombits(x),
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
143 Y: math.Float64frombits(y),
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
144 }
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
145 }
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
146 rings[j] = points
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
147 }
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
148 polygons[i] = rings
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
149 }
8b730ee6f17b Completed parsing multi polygons from WKB.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4296
diff changeset
150
4296
95786a675d70 WIP: Started with downloading stretches as ESRI shapes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
151 *mpg = polygons
95786a675d70 WIP: Started with downloading stretches as ESRI shapes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
152 return nil
95786a675d70 WIP: Started with downloading stretches as ESRI shapes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
153 }
4313
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
154
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
155 func (lr LinearRingGeom) CCW() bool {
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
156 var sum float64
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
157 for i, v1 := range lr {
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
158 v2 := lr[(i+1)%len(lr)]
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
159 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
160 }
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
161 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
162 }
4667
0ddb308fed37 Reintroduced the ST_MakeValid calls when inserting the iso geometries into the database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4331
diff changeset
163
0ddb308fed37 Reintroduced the ST_MakeValid calls when inserting the iso geometries into the database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4331
diff changeset
164 func (lr LinearRingGeom) Reverse() {
0ddb308fed37 Reintroduced the ST_MakeValid calls when inserting the iso geometries into the database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4331
diff changeset
165 for i, j := 0, len(lr)-1; i < j; i, j = i+1, j-1 {
0ddb308fed37 Reintroduced the ST_MakeValid calls when inserting the iso geometries into the database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4331
diff changeset
166 lr[i], lr[j] = lr[j], lr[i]
0ddb308fed37 Reintroduced the ST_MakeValid calls when inserting the iso geometries into the database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4331
diff changeset
167 }
0ddb308fed37 Reintroduced the ST_MakeValid calls when inserting the iso geometries into the database.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 4331
diff changeset
168 }