Mercurial > gemma

annotate pkg/imports/wkb.go @ 2549:9bf6b767a56a

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client: refactored and improved splitscreen for diagrams To make different diagrams possible, the splitscreen view needed to be decoupled from the cross profiles. Also the style has changed to make it more consistent with the rest of the app. The standard box header is now used and there are collapse and expand animations.
author Markus Kottlaender <markus@intevation.de>
date Fri, 08 Mar 2019 08:50:47 +0100
parents 63475c8e710e
children 8b75ac5e243e
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 {
614c6c766691 Waterway area import: Implemented.
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parents:
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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
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139 vertices := make([]float64, 2*howMany)
1785
614c6c766691 Waterway area import: Implemented.
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parents:
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140 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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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
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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:
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145 }
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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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:
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148 return out
614c6c766691 Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
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149 }