Mercurial > gemma
annotate pkg/imports/polygon.go @ 1321:8d9754007089
Used keyed initializer to make 'go vet' happy.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Sat, 24 Nov 2018 16:40:34 +0100 |
parents | a244b18cb916 |
children | 3bf1f0de0763 |
rev | line source |
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1017
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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 |
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25 type ( |
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26 Point struct { |
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27 X float64 |
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28 Y float64 |
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29 } |
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30 LineString []Point |
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31 Polygon []LineString |
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32 ) |
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33 |
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34 const ( |
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35 wkbNDR byte = 1 |
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36 wkbPolygon uint32 = 3 |
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37 ) |
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38 |
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39 func shapeToPolygon(s shp.Shape) (Polygon, error) { |
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40 switch p := s.(type) { |
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41 case *shp.Polygon: |
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42 return toPolygon(p.NumParts, p.Parts, p.Points), nil |
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43 case *shp.PolygonZ: |
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44 return toPolygon(p.NumParts, p.Parts, p.Points), nil |
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45 case *shp.PolygonM: |
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46 return toPolygon(p.NumParts, p.Parts, p.Points), nil |
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47 } |
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48 return nil, fmt.Errorf("Unsupported shape type %T", s) |
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49 } |
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50 |
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51 func toPolygon(numParts int32, parts []int32, points []shp.Point) Polygon { |
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52 out := make(Polygon, numParts) |
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53 pos := 0 |
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54 for i := range out { |
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55 ps := parts[i] |
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56 line := make(LineString, ps) |
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57 for j := int32(0); j < ps; j, pos = j+1, pos+1 { |
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58 p := &points[pos] |
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59 line[j] = Point{p.X, p.Y} |
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60 } |
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61 out[i] = line |
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62 } |
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63 return out |
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64 } |
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65 |
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66 func (p Polygon) AsWBK() []byte { |
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67 if p == nil { |
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68 return nil |
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69 } |
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70 // pre-calculate size to avoid reallocations. |
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71 size := 1 + 4 + 4 |
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72 for _, ring := range p { |
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73 size += 4 + len(ring)*2*8 |
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74 } |
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75 |
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76 buf := bytes.NewBuffer(make([]byte, 0, size)) |
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77 |
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78 binary.Write(buf, binary.LittleEndian, wkbNDR) |
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79 binary.Write(buf, binary.LittleEndian, wkbPolygon) |
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80 binary.Write(buf, binary.LittleEndian, uint32(len(p))) |
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81 |
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82 for _, ring := range p { |
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83 binary.Write(buf, binary.LittleEndian, uint32(len(ring))) |
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84 for _, v := range ring { |
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85 binary.Write(buf, binary.LittleEndian, math.Float64bits(v.X)) |
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86 binary.Write(buf, binary.LittleEndian, math.Float64bits(v.Y)) |
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87 } |
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88 } |
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89 |
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90 return buf.Bytes() |
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91 } |