Mercurial > gemma
view pkg/octree/util.go @ 4316:3d6a2c6b436c
shape upload stretch import: Store features in database. Still broken [WIP].
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Tue, 03 Sep 2019 19:01:51 +0200 |
parents | 620038ade708 |
children |
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// Copyright (C) 2018 Michael Fogleman // // Permission is hereby granted, free of charge, to any person obtaining // a copy of this software and associated documentation files (the "Software"), // to deal in the Software without restriction, including without limitation // the rights to use, copy, modify, merge, publish, distribute, sublicense, // and/or sell copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be included // in all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. package octree import "math" var ( eps = math.Nextafter(1, 2) - 1 infinity = math.Inf(1) ) func pseudoAngle(dx, dy float64) float64 { p := dx / (math.Abs(dx) + math.Abs(dy)) if dy > 0 { p = (3 - p) / 4 } else { p = (1 + p) / 4 } return math.Max(0, math.Min(1-eps, p)) }