Mercurial > gemma
annotate pkg/imports/wkb.go @ 3963:feb53713bc2f diagram-cleanup
client: moved duplicated code to mixins and unified code patterns in diagram components [WIP]
author | Markus Kottlaender <markus@intevation.de> |
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date | Fri, 12 Jul 2019 15:14:16 +0200 |
parents | 63475c8e710e |
children | 8b75ac5e243e |
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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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135 howMany = parts[i+1] - parts[i] |
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136 } |
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137 |
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138 line := make([][]float64, howMany) |
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139 vertices := make([]float64, 2*howMany) |
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140 for j := int32(0); j < howMany; j, pos = j+1, pos+1 { |
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141 p := &points[pos] |
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142 vertex := vertices[j*2 : j*2+2] |
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143 vertex[0], vertex[1] = p.X, p.Y |
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144 line[j] = vertex |
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145 } |
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146 out[i] = line |
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147 } |
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148 return out |
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149 } |