Mercurial > gemma
annotate pkg/imports/wkb.go @ 1785:614c6c766691
Waterway area import: Implemented.
author | Sascha L. Teichmann <teichmann@intevation.de> |
---|---|
date | Sat, 12 Jan 2019 19:53:31 +0100 |
parents | |
children | 09349ca27dd7 |
rev | line source |
---|---|
1785
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
1 // This is Free Software under GNU Affero General Public License v >= 3.0 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
2 // without warranty, see README.md and license for details. |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
3 // |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
4 // SPDX-License-Identifier: AGPL-3.0-or-later |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
5 // License-Filename: LICENSES/AGPL-3.0.txt |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
6 // |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
7 // Copyright (C) 2018 by via donau |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
8 // – Österreichische Wasserstraßen-Gesellschaft mbH |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
9 // Software engineering by Intevation GmbH |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
10 // |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
11 // Author(s): |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de> |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
13 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
14 package imports |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
15 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
16 import ( |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
17 "bytes" |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
18 "encoding/binary" |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
19 "fmt" |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
20 "math" |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
21 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
22 shp "github.com/jonas-p/go-shp" |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
23 ) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
24 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
25 type ( |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
26 lineSlice [][]float64 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
27 polygonSlice [][][]float64 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
28 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
29 point struct { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
30 X float64 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
31 Y float64 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
32 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
33 lineString []point |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
34 polygon []lineString |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
35 ) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
36 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
37 const ( |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
38 wkbNDR byte = 1 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
39 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
40 wkbLineString uint32 = 2 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
41 wkbPolygon uint32 = 3 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
42 ) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
43 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
44 func (l lineSlice) asWKB() []byte { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
45 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
46 size := 1 + 4 + 4 + len(l)*(2*8) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
47 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
48 buf := bytes.NewBuffer(make([]byte, 0, size)) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
49 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
50 binary.Write(buf, binary.LittleEndian, wkbNDR) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
51 binary.Write(buf, binary.LittleEndian, wkbLineString) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
52 binary.Write(buf, binary.LittleEndian, uint32(len(l))) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
53 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
54 for _, c := range l { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
55 var lat, lon float64 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
56 if len(c) > 0 { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
57 lat = c[0] |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
58 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
59 if len(c) > 1 { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
60 lon = c[1] |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
61 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
62 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat)) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
63 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon)) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
64 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
65 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
66 return buf.Bytes() |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
67 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
68 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
69 func (p polygonSlice) asWKB() []byte { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
70 if p == nil { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
71 return nil |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
72 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
73 // pre-calculate size to avoid reallocations. |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
74 size := 1 + 4 + 4 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
75 for _, ring := range p { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
76 size += 4 + len(ring)*2*8 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
77 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
78 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
79 buf := bytes.NewBuffer(make([]byte, 0, size)) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
80 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
81 binary.Write(buf, binary.LittleEndian, wkbNDR) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
82 binary.Write(buf, binary.LittleEndian, wkbPolygon) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
83 binary.Write(buf, binary.LittleEndian, uint32(len(p))) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
84 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
85 for _, ring := range p { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
86 binary.Write(buf, binary.LittleEndian, uint32(len(ring))) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
87 for _, v := range ring { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
88 var lat, lon float64 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
89 if len(v) > 0 { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
90 lat = v[0] |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
91 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
92 if len(v) > 1 { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
93 lon = v[1] |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
94 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
95 binary.Write(buf, binary.LittleEndian, math.Float64bits(lat)) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
96 binary.Write(buf, binary.LittleEndian, math.Float64bits(lon)) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
97 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
98 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
99 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
100 return buf.Bytes() |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
101 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
102 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
103 func shapeToPolygon(s shp.Shape) (polygon, error) { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
104 switch p := s.(type) { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
105 case *shp.Polygon: |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
106 return toPolygon(p.NumParts, p.Parts, p.Points), nil |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
107 case *shp.PolygonZ: |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
108 return toPolygon(p.NumParts, p.Parts, p.Points), nil |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
109 case *shp.PolygonM: |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
110 return toPolygon(p.NumParts, p.Parts, p.Points), nil |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
111 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
112 return nil, fmt.Errorf("Unsupported shape type %T", s) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
113 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
114 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
115 func toPolygon(numParts int32, parts []int32, points []shp.Point) polygon { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
116 out := make(polygon, numParts) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
117 var pos int32 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
118 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
119 for i := range out { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
120 var howMany int32 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
121 if i+1 >= len(parts) { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
122 howMany = int32(len(points)) - pos |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
123 } else { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
124 howMany = parts[i+1] - parts[i] |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
125 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
126 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
127 line := make(lineString, howMany) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
128 for j := int32(0); j < howMany; j, pos = j+1, pos+1 { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
129 p := &points[pos] |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
130 line[j] = point{p.X, p.Y} |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
131 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
132 out[i] = line |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
133 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
134 return out |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
135 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
136 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
137 func (p polygon) asWKB() []byte { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
138 if p == nil { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
139 return nil |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
140 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
141 // pre-calculate size to avoid reallocations. |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
142 size := 1 + 4 + 4 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
143 for _, ring := range p { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
144 size += 4 + len(ring)*2*8 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
145 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
146 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
147 buf := bytes.NewBuffer(make([]byte, 0, size)) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
148 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
149 binary.Write(buf, binary.LittleEndian, wkbNDR) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
150 binary.Write(buf, binary.LittleEndian, wkbPolygon) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
151 binary.Write(buf, binary.LittleEndian, uint32(len(p))) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
152 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
153 for _, ring := range p { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
154 binary.Write(buf, binary.LittleEndian, uint32(len(ring))) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
155 for _, v := range ring { |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
156 binary.Write(buf, binary.LittleEndian, math.Float64bits(v.X)) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
157 binary.Write(buf, binary.LittleEndian, math.Float64bits(v.Y)) |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
158 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
159 } |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
160 |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
161 return buf.Bytes() |
614c6c766691
Waterway area import: Implemented.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
162 } |