Mercurial > gemma
annotate pkg/octree/vertex.go @ 768:3219e7e34953
Join neighbored linestring segments in octree cross sections and sort them along the input line.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
---|---|
date | Tue, 25 Sep 2018 17:45:44 +0200 |
parents | d05bc3e34338 |
children | ba2007b746ef |
rev | line source |
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727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
1 package octree |
674
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
2 |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
3 import ( |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
4 "bytes" |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
5 "encoding/binary" |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
6 "io" |
763
d05bc3e34338
More infrastructure for the octree driven cross section endpoint.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
730
diff
changeset
|
7 "log" |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
8 "math" |
768
3219e7e34953
Join neighbored linestring segments in octree cross sections and sort them along the input line.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
763
diff
changeset
|
9 "sort" |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
10 ) |
674
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
11 |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
12 type ( |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
13 Vertex struct { |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
14 X float64 |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
15 Y float64 |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
16 Z float64 |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
17 } |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
18 |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
19 Triangle [3]Vertex |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
20 |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
21 Line [2]Vertex |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
22 |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
23 LineStringZ []Vertex |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
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24 MultiLineStringZ []LineStringZ |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
25 ) |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
26 |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
27 const ( |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
28 wkbNDR byte = 1 |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
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29 wkbPointZ uint32 = 1000 + 1 |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
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30 wkbLineStringZ uint32 = 1000 + 2 |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
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31 wkbMultiLineStringZ uint32 = 1000 + 5 |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
32 ) |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
33 |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
34 func (v *Vertex) Minimize(w Vertex) { |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
35 if w.X < v.X { |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
36 v.X = w.X |
674
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
37 } |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
38 if w.Y < v.Y { |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
39 v.Y = w.Y |
674
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
40 } |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
41 if w.Z < v.Z { |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
42 v.Z = w.Z |
674
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
43 } |
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
44 } |
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
45 |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
46 func (v *Vertex) Maximize(w Vertex) { |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
47 if w.X > v.X { |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
48 v.X = w.X |
674
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
49 } |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
50 if w.Y > v.Y { |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
51 v.Y = w.Y |
674
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
52 } |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
53 if w.Z > v.Z { |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
54 v.Z = w.Z |
674
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
55 } |
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
56 } |
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
57 |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
58 func (v Vertex) Sub(w Vertex) Vertex { |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
59 return Vertex{ |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
60 v.X - w.X, |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
61 v.Y - w.Y, |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
62 v.Z - w.Z, |
674
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
63 } |
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
64 } |
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
65 |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
66 func (v Vertex) Add(w Vertex) Vertex { |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
67 return Vertex{ |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
68 v.X + w.X, |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
69 v.Y + w.Y, |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
70 v.Z + w.Z, |
687
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
71 } |
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
72 } |
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
73 |
730
4c05bdbf8e4b
Renamed scale in Vertex to uppercase to make it public.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
729
diff
changeset
|
74 func (v Vertex) Scale(s float64) Vertex { |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
75 return Vertex{ |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
76 s * v.X, |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
77 s * v.Y, |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
78 s * v.Z, |
687
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
79 } |
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
80 } |
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
81 |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
82 func Interpolate(v1, v2 Vertex) func(Vertex) Vertex { |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
83 v2 = v2.Sub(v1) |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
84 return func(s Vertex) Vertex { |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
85 return Vertex{ |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
86 v2.X*s.X + v1.X, |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
87 v2.Y*s.Y + v1.Y, |
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
88 v2.Z*s.Z + v1.Z, |
674
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
89 } |
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
90 } |
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
91 } |
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
92 |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
93 func (a Vertex) Less(b Vertex) bool { |
727
41c8dc61f38f
Moved octree loading stuff to octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
726
diff
changeset
|
94 return a.X < b.X || a.Y < b.Y || a.Z < b.Z |
674
120a82bd9953
octree: Added loading frame for contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
|
95 } |
687
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
96 |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
97 func NewLine(p1, p2 Vertex) Line { |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
98 return Line{ |
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
99 p2.Sub(p1), |
687
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
100 p1, |
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
101 } |
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
102 } |
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
103 |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
104 func (l Line) Eval(t float64) Vertex { |
730
4c05bdbf8e4b
Renamed scale in Vertex to uppercase to make it public.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
729
diff
changeset
|
105 return l[0].Scale(t).Add(l[1]) |
687
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
106 } |
be90ab542aa7
octree: contouring: Do the math to calculate the intersection points of the triangles and the planes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
674
diff
changeset
|
107 |
726
5af9ab39e715
Renamed a few types to uppercase names to prepare the move to the octree package.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
718
diff
changeset
|
108 func (l Line) IntersectHorizontal(h float64) Vertex { |
727
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109 t := (h - l[1].Z) / l[0].Z |
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110 return l.Eval(t) |
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111 } |
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112 |
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113 func side(z, h float64) int { |
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114 switch { |
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115 case z < h: |
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116 return -1 |
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117 case z > h: |
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118 return +1 |
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119 } |
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120 return 0 |
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121 } |
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122 |
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123 func (t *Triangle) IntersectHorizontal(h float64) LineStringZ { |
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124 sides := [3]int{ |
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125 side(t[0].Z, h), |
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126 side(t[1].Z, h), |
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127 side(t[2].Z, h), |
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128 } |
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129 |
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130 var points LineStringZ |
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131 |
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132 for i := 0; i < 3; i++ { |
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133 j := (i + 1) % 3 |
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134 si := sides[i] |
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135 sj := sides[j] |
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136 |
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137 switch { |
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138 case si == 0 && sj == 0: |
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139 // both on plane |
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140 points = append(points, t[i], t[j]) |
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141 case si == 0 && sj != 0: |
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142 // first on plane |
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143 points = append(points, t[i]) |
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144 case si != 0 && sj == 0: |
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145 // second on plane |
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146 points = append(points, t[j]) |
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147 case si == sj: |
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148 // both on same side |
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149 default: |
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150 // real intersection |
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151 v := NewLine(t[i], t[j]).IntersectHorizontal(h) |
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152 points = append(points, v) |
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153 } |
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154 } |
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155 |
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156 return points |
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157 } |
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158 |
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159 func (t *Triangle) IntersectVertical(x1, y1, x2, y2 float64) LineStringZ { |
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160 // TODO: Implement me! |
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161 log.Println("Triangle.IntersectVertical is not implemented, yet!") |
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162 return nil |
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163 } |
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164 |
768
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165 func linearScale(x1, y1, x2, y2 float64) func(Vertex) float64 { |
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166 dx := x2 - x1 |
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167 dy := y2 - y1 |
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168 |
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169 switch { |
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170 case dx != 0: |
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171 return func(v Vertex) float64 { |
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172 return (v.X - x1) / dx |
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173 } |
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174 case dy != 0: |
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175 return func(v Vertex) float64 { |
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176 return (v.Y - y1) / dy |
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177 } |
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178 default: |
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179 return func(Vertex) float64 { |
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180 return 0 |
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181 } |
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182 } |
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183 } |
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184 |
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185 func (ls LineStringZ) order(position func(Vertex) float64) { |
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186 type posVertex struct { |
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187 pos float64 |
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188 v Vertex |
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189 } |
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190 positions := make([]posVertex, len(ls)) |
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191 for i, v := range ls { |
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192 positions[i] = posVertex{position(v), v} |
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193 } |
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194 sort.Slice(positions, func(i, j int) bool { |
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195 return positions[i].pos < positions[j].pos |
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196 }) |
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197 for i := range positions { |
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198 ls[i] = positions[i].v |
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199 } |
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200 } |
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201 |
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202 func (v Vertex) EpsEquals(w Vertex) bool { |
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203 const eqs = 1e-5 |
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204 return math.Abs(v.X-w.X) < eps && |
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205 math.Abs(v.Y-w.Y) < eps && math.Abs(v.Z-w.Z) < eps |
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206 } |
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207 |
763
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208 func (mls MultiLineStringZ) JoinOnLine(x1, y1, x2, y2 float64) MultiLineStringZ { |
768
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209 |
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210 position := linearScale(x1, y1, x2, y2) |
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211 |
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212 type posLineString struct { |
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213 pos float64 |
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214 line LineStringZ |
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215 } |
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216 |
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217 positions := make([]posLineString, 0, len(mls)) |
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218 |
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219 for _, ls := range mls { |
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220 if len(ls) == 0 { |
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221 continue |
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222 } |
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223 // order the atoms first |
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224 ls.order(position) |
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225 positions = append(positions, posLineString{position(ls[0]), ls}) |
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226 } |
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227 |
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228 sort.Slice(positions, func(i, j int) bool { |
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229 return positions[i].pos < positions[j].pos |
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230 }) |
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231 |
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232 out := make(MultiLineStringZ, 0, len(positions)) |
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233 |
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234 for i := range positions { |
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235 curr := positions[i].line |
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236 if l := len(out); l > 0 { |
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237 if last := out[l-1]; last[len(last)-1].EpsEquals(curr[0]) { |
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238 out[l-1] = append(last[:len(last)-1], curr...) |
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239 continue |
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240 } |
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241 } |
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242 out = append(out, curr) |
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243 } |
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244 |
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245 return out |
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246 } |
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247 |
729
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248 func (v *Vertex) Write(w io.Writer) error { |
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249 if err := binary.Write( |
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250 w, binary.LittleEndian, math.Float64bits(v.X)); err != nil { |
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251 return err |
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252 } |
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253 if err := binary.Write( |
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254 w, binary.LittleEndian, math.Float64bits(v.Y)); err != nil { |
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255 return err |
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256 } |
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257 return binary.Write( |
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258 w, binary.LittleEndian, math.Float64bits(v.Z)) |
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259 } |
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260 |
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261 func (v *Vertex) Read(r io.Reader) error { |
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262 var buf [8]byte |
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263 b := buf[:] |
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264 if _, err := io.ReadFull(r, b); err != nil { |
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265 return nil |
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266 } |
727
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267 v.X = math.Float64frombits(binary.LittleEndian.Uint64(b)) |
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268 if _, err := io.ReadFull(r, b); err != nil { |
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269 return nil |
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270 } |
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271 v.Y = math.Float64frombits(binary.LittleEndian.Uint64(b)) |
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272 if _, err := io.ReadFull(r, b); err != nil { |
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273 return nil |
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274 } |
727
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275 v.Z = math.Float64frombits(binary.LittleEndian.Uint64(b)) |
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276 return nil |
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277 } |
727
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278 |
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279 func (mls MultiLineStringZ) AsWKB() []byte { |
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280 |
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281 var buf bytes.Buffer |
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282 |
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283 binary.Write(&buf, binary.LittleEndian, wkbNDR) |
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284 binary.Write(&buf, binary.LittleEndian, wkbMultiLineStringZ) |
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285 binary.Write(&buf, binary.LittleEndian, uint32(len(mls))) |
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286 |
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287 for _, ml := range mls { |
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288 binary.Write(&buf, binary.LittleEndian, wkbNDR) |
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289 binary.Write(&buf, binary.LittleEndian, wkbLineStringZ) |
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290 binary.Write(&buf, binary.LittleEndian, uint32(len(ml))) |
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291 for _, p := range ml { |
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292 binary.Write(&buf, binary.LittleEndian, math.Float64bits(p.X)) |
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293 binary.Write(&buf, binary.LittleEndian, math.Float64bits(p.Y)) |
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294 binary.Write(&buf, binary.LittleEndian, math.Float64bits(p.Z)) |
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295 } |
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296 } |
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297 |
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298 return buf.Bytes() |
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299 } |