Mercurial > gemma
comparison pkg/mesh/util.go @ 4827:f4abfd0ee8ad remove-octree-debris
Renamed octree package to mesh as there is no octree any more.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Tue, 05 Nov 2019 14:30:22 +0100 |
parents | pkg/octree/util.go@620038ade708 |
children |
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4826:ec5afada70ec | 4827:f4abfd0ee8ad |
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1 // Copyright (C) 2018 Michael Fogleman | |
2 // | |
3 // Permission is hereby granted, free of charge, to any person obtaining | |
4 // a copy of this software and associated documentation files (the "Software"), | |
5 // to deal in the Software without restriction, including without limitation | |
6 // the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
7 // and/or sell copies of the Software, and to permit persons to whom the | |
8 // Software is furnished to do so, subject to the following conditions: | |
9 // | |
10 // The above copyright notice and this permission notice shall be included | |
11 // in all copies or substantial portions of the Software. | |
12 // | |
13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
14 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
16 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
17 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
18 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
19 | |
20 package mesh | |
21 | |
22 import "math" | |
23 | |
24 var ( | |
25 eps = math.Nextafter(1, 2) - 1 | |
26 infinity = math.Inf(1) | |
27 ) | |
28 | |
29 func pseudoAngle(dx, dy float64) float64 { | |
30 p := dx / (math.Abs(dx) + math.Abs(dy)) | |
31 if dy > 0 { | |
32 p = (3 - p) / 4 | |
33 } else { | |
34 p = (1 + p) / 4 | |
35 } | |
36 return math.Max(0, math.Min(1-eps, p)) | |
37 } |