Mercurial > gemma
annotate pkg/imports/wkb.go @ 4319:0d516bac1aae
bottleneck fairway availability: minor layout adjustments
author | Thomas Junk <thomas.junk@intevation.de> |
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date | Wed, 04 Sep 2019 12:21:36 +0200 |
parents | 5da02dcc51f6 |
children | 046a07a33b19 |
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) 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 (ls lineSlice) LinearRingGeom() wkb.LinearRingGeom { |
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59 lr := make(wkb.LinearRingGeom, len(ls)) |
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60 for i, v := range ls { |
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61 lr[i].X = v[0] |
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62 lr[i].Y = v[1] |
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63 } |
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64 return lr |
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65 } |
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66 |
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67 func (p pointSlice) asWKB() []byte { |
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68 |
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69 size := 1 + 4 + 2*8 |
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70 |
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71 buf := bytes.NewBuffer(make([]byte, 0, size)) |
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72 |
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73 binary.Write(buf, binary.LittleEndian, wkb.NDR) |
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74 binary.Write(buf, binary.LittleEndian, wkb.Point) |
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75 |
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76 var lat, lon float64 |
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77 if len(p) > 0 { |
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78 lat = p[0] |
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79 } |
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80 if len(p) > 1 { |
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81 lon = p[1] |
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82 } |
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83 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat)) |
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84 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon)) |
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85 |
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86 return buf.Bytes() |
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87 } |
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88 |
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89 func (p polygonSlice) asWKB() []byte { |
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90 if p == nil { |
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91 return nil |
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92 } |
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93 // pre-calculate size to avoid reallocations. |
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94 size := 1 + 4 + 4 |
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95 for _, ring := range p { |
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96 size += 4 + len(ring)*2*8 |
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97 } |
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98 |
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99 buf := bytes.NewBuffer(make([]byte, 0, size)) |
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100 |
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101 binary.Write(buf, binary.LittleEndian, wkb.NDR) |
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102 binary.Write(buf, binary.LittleEndian, wkb.Polygon) |
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103 binary.Write(buf, binary.LittleEndian, uint32(len(p))) |
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104 |
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105 for _, ring := range p { |
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106 binary.Write(buf, binary.LittleEndian, uint32(len(ring))) |
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107 for _, v := range ring { |
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108 var lat, lon float64 |
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109 if len(v) > 0 { |
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110 lat = v[0] |
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111 } |
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112 if len(v) > 1 { |
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113 lon = v[1] |
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114 } |
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115 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat)) |
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116 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon)) |
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117 } |
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118 } |
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119 |
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120 return buf.Bytes() |
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121 } |
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122 |
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123 func shapeToPolygon(s shp.Shape) (polygonSlice, error) { |
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124 switch p := s.(type) { |
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125 case *shp.Polygon: |
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126 return toPolygon(p.NumParts, p.Parts, p.Points), nil |
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127 case *shp.PolygonZ: |
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128 return toPolygon(p.NumParts, p.Parts, p.Points), nil |
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129 case *shp.PolygonM: |
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130 return toPolygon(p.NumParts, p.Parts, p.Points), nil |
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131 } |
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132 return nil, fmt.Errorf("unsupported shape type %T", s) |
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133 } |
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134 |
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135 func toPolygon(numParts int32, parts []int32, points []shp.Point) polygonSlice { |
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136 out := make(polygonSlice, numParts) |
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137 var pos int32 |
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138 |
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139 for i := range out { |
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140 var howMany int32 |
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141 if i+1 >= len(parts) { |
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142 howMany = int32(len(points)) - pos |
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143 } else { |
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144 howMany = parts[i+1] - parts[i] |
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145 } |
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146 |
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147 line := make([][]float64, howMany) |
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148 vertices := make([]float64, 2*howMany) |
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149 for j := int32(0); j < howMany; j, pos = j+1, pos+1 { |
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150 p := &points[pos] |
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151 vertex := vertices[j*2 : j*2+2] |
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152 vertex[0], vertex[1] = p.X, p.Y |
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153 line[j] = vertex |
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154 } |
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155 out[i] = line |
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156 } |
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157 return out |
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158 } |
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159 |
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160 func (ps polygonSlice) MultiPolygonGeom() wkb.MultiPolygonGeom { |
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161 |
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162 var mp wkb.MultiPolygonGeom |
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163 var curr wkb.PolygonGeom |
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164 |
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165 for _, r := range ps { |
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166 lr := lineSlice(r).LinearRingGeom() |
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167 // A counter clockwise ring starts a new polygon. |
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168 if lr.CCW() { |
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169 if len(curr) > 0 { |
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170 mp = append(mp, curr) |
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171 curr = wkb.PolygonGeom{} |
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172 } |
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173 } |
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174 curr = append(curr, lr) |
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175 } |
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176 |
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177 if len(curr) > 0 { |
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178 mp = append(mp, curr) |
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179 } |
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180 |
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181 return mp |
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182 } |