Mercurial > gemma
annotate pkg/mesh/triangulation.go @ 5418:e89ff1894bb4 marking-single-beam
Don't clip the points against the border polygon. The implemented way was wrong.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Wed, 07 Jul 2021 18:27:40 +0200 |
parents | 3f0382e9f302 |
children | 5f47eeea988d |
rev | line source |
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620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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1 // Copyright (C) 2018 Michael Fogleman |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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2 // |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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parents:
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3 // Permission is hereby granted, free of charge, to any person obtaining |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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4 // a copy of this software and associated documentation files (the "Software"), |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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parents:
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5 // to deal in the Software without restriction, including without limitation |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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parents:
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6 // the rights to use, copy, modify, merge, publish, distribute, sublicense, |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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7 // and/or sell copies of the Software, and to permit persons to whom the |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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parents:
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8 // Software is furnished to do so, subject to the following conditions: |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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9 // |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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parents:
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10 // The above copyright notice and this permission notice shall be included |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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11 // in all copies or substantial portions of the Software. |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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parents:
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12 // |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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14 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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16 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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17 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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18 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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19 |
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Renamed octree package to mesh as there is no octree any more.
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20 package mesh |
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Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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21 |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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parents:
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22 import ( |
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23 "log" |
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24 "math" |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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25 |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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26 "gonum.org/v1/gonum/stat" |
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Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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27 ) |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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28 |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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parents:
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29 type Triangulation struct { |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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30 Points []Vertex |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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31 ConvexHull []Vertex |
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Use fogleman's triangulation.
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32 Triangles []int32 |
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Use fogleman's triangulation.
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33 Halfedges []int32 |
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620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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34 } |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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35 |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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36 // Triangulate returns a Delaunay triangulation of the provided points. |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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37 func Triangulate(points []Vertex) (*Triangulation, error) { |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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38 t := newTriangulator(points) |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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39 err := t.triangulate() |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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40 return &Triangulation{points, t.convexHull(), t.triangles, t.halfedges}, err |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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41 } |
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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parents:
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42 |
3733
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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43 func (t *Triangulation) EstimateTooLong() float64 { |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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44 |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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45 num := len(t.Triangles) / 3 |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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46 |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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47 lengths := make([]float64, 0, num) |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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48 |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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49 points := t.Points |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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50 |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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51 tris: |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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52 for i := 0; i < num; i++ { |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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53 idx := i * 3 |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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54 var max float64 |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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55 vs := t.Triangles[idx : idx+3] |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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56 for j, vj := range vs { |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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57 if t.Halfedges[idx+j] < 0 { |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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58 continue tris |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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59 } |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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60 k := (j + 1) % 3 |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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61 if l := points[vj].Distance2D(points[vs[k]]); l > max { |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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62 max = l |
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parents:
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63 } |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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64 } |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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65 lengths = append(lengths, max) |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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66 } |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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67 |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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68 std := stat.StdDev(lengths, nil) |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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69 return 3.5 * std |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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70 } |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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71 |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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72 func (t *Triangulation) ConcaveHull(tooLong float64) (LineStringZ, map[int32]struct{}) { |
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parents:
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73 |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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74 if tooLong <= 0 { |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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75 tooLong = t.EstimateTooLong() |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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76 } |
ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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77 |
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Removed statistics from elimination of triangles.
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78 tooLong *= tooLong |
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79 |
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concave hulls for single beam scans ... WIP.
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80 var candidates []int32 |
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81 |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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82 points := t.Points |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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83 |
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Removed statistics from elimination of triangles.
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84 for i, num := 0, len(t.Triangles)/3; i < num; i++ { |
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Moved triangle elimination to triangulation code.
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parents:
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85 idx := i * 3 |
6248a4bc10c7
Moved triangle elimination to triangulation code.
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parents:
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86 var max float64 |
6248a4bc10c7
Moved triangle elimination to triangulation code.
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parents:
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87 vs := t.Triangles[idx : idx+3] |
6248a4bc10c7
Moved triangle elimination to triangulation code.
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parents:
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88 for j, vj := range vs { |
6248a4bc10c7
Moved triangle elimination to triangulation code.
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parents:
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89 k := (j + 1) % 3 |
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ec86a7155377
Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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parents:
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90 if l := points[vj].SquaredDistance2D(points[vs[k]]); l > max { |
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Moved triangle elimination to triangulation code.
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parents:
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91 max = l |
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Moved triangle elimination to triangulation code.
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parents:
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92 } |
6248a4bc10c7
Moved triangle elimination to triangulation code.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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|
93 } |
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|
94 if max > tooLong { |
3621
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95 candidates = append(candidates, int32(i)) |
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|
96 } |
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97 } |
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98 |
3639
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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diff
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|
99 removed := map[int32]struct{}{} |
3604
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|
100 |
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|
101 isBorder := func(n int32) bool { |
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102 n *= 3 |
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103 for i := int32(0); i < 3; i++ { |
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104 e := n + i |
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105 o := t.Halfedges[e] |
2a4216c81e7b
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|
106 if o < 0 { |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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|
107 return true |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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|
108 } |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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|
109 if _, found := removed[o/3]; found { |
3604
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110 return true |
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111 } |
6248a4bc10c7
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112 } |
6248a4bc10c7
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113 return false |
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114 } |
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115 |
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116 var newCandidates []int32 |
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117 |
3623
1973fa69b2bb
More SVG debug output.
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118 log.Printf("info: candidates: %d\n", len(candidates)) |
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119 for len(candidates) > 0 { |
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120 |
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121 oldRemoved := len(removed) |
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122 |
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123 for _, i := range candidates { |
3604
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124 |
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|
125 if isBorder(i) { |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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126 removed[i] = struct{}{} |
3604
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127 } else { |
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128 newCandidates = append(newCandidates, i) |
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|
129 } |
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|
130 } |
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|
131 |
6248a4bc10c7
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132 if oldRemoved == len(removed) { |
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|
133 break |
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|
134 } |
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Moved triangle elimination to triangulation code.
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135 |
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136 candidates = newCandidates |
3604
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137 newCandidates = newCandidates[:0] |
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|
138 } |
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|
139 |
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140 log.Printf("info: candidates left: %d\n", len(candidates)) |
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141 log.Printf("info: triangles: %d\n", len(t.Triangles)/3) |
3604
6248a4bc10c7
Moved triangle elimination to triangulation code.
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|
142 log.Printf("info: triangles to remove: %d\n", len(removed)) |
6248a4bc10c7
Moved triangle elimination to triangulation code.
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diff
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|
143 |
3634
db7136854a51
Hash the vertices of the concave hull together.
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diff
changeset
|
144 type edge struct { |
db7136854a51
Hash the vertices of the concave hull together.
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diff
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|
145 a, b int32 |
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Hash the vertices of the concave hull together.
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diff
changeset
|
146 prev, next *edge |
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Hash the vertices of the concave hull together.
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diff
changeset
|
147 } |
db7136854a51
Hash the vertices of the concave hull together.
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diff
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|
148 |
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Hash the vertices of the concave hull together.
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diff
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|
149 isClosed := func(e *edge) bool { |
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Hash the vertices of the concave hull together.
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diff
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150 for curr := e.next; curr != nil; curr = curr.next { |
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Hash the vertices of the concave hull together.
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diff
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|
151 if curr == e { |
db7136854a51
Hash the vertices of the concave hull together.
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diff
changeset
|
152 return true |
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Hash the vertices of the concave hull together.
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diff
changeset
|
153 } |
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Hash the vertices of the concave hull together.
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parents:
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diff
changeset
|
154 } |
db7136854a51
Hash the vertices of the concave hull together.
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diff
changeset
|
155 return false |
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Hash the vertices of the concave hull together.
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diff
changeset
|
156 } |
db7136854a51
Hash the vertices of the concave hull together.
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parents:
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diff
changeset
|
157 |
db7136854a51
Hash the vertices of the concave hull together.
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diff
changeset
|
158 open := map[int32]*edge{} |
db7136854a51
Hash the vertices of the concave hull together.
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diff
changeset
|
159 var rings []*edge |
3621
2893ee8ce06f
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diff
changeset
|
160 |
2893ee8ce06f
concave hulls for single beam scans ... WIP.
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diff
changeset
|
161 for i, num := int32(0), int32(len(t.Triangles)/3); i < num; i++ { |
3639
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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parents:
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diff
changeset
|
162 if _, found := removed[i]; found { |
3621
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concave hulls for single beam scans ... WIP.
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diff
changeset
|
163 continue |
2893ee8ce06f
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diff
changeset
|
164 } |
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diff
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|
165 n := i * 3 |
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changeset
|
166 for j := int32(0); j < 3; j++ { |
2893ee8ce06f
concave hulls for single beam scans ... WIP.
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diff
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|
167 e := n + j |
3639
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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parents:
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diff
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|
168 f := t.Halfedges[e] |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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parents:
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diff
changeset
|
169 if f >= 0 { |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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parents:
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changeset
|
170 if _, found := removed[f/3]; !found { |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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parents:
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diff
changeset
|
171 continue |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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diff
changeset
|
172 } |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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parents:
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diff
changeset
|
173 } |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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parents:
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diff
changeset
|
174 a := t.Triangles[e] |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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diff
changeset
|
175 b := t.Triangles[n+(j+1)%3] |
3634
db7136854a51
Hash the vertices of the concave hull together.
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diff
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|
176 |
3639
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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diff
changeset
|
177 curr := &edge{a: a, b: b} |
3634
db7136854a51
Hash the vertices of the concave hull together.
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|
178 |
3639
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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diff
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|
179 if old := open[a]; old != nil { |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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changeset
|
180 delete(open, a) |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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|
181 if old.a == a { |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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parents:
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diff
changeset
|
182 old.prev = curr |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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diff
changeset
|
183 curr.next = old |
3634
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Hash the vertices of the concave hull together.
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diff
changeset
|
184 } else { |
3639
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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parents:
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diff
changeset
|
185 old.next = curr |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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parents:
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diff
changeset
|
186 curr.prev = old |
3634
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Hash the vertices of the concave hull together.
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changeset
|
187 } |
db7136854a51
Hash the vertices of the concave hull together.
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diff
changeset
|
188 |
3639
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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changeset
|
189 if isClosed(old) { |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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changeset
|
190 rings = append(rings, old) |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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parents:
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diff
changeset
|
191 } |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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changeset
|
192 } else { |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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changeset
|
193 open[a] = curr |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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changeset
|
194 } |
3634
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Hash the vertices of the concave hull together.
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|
195 |
3639
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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changeset
|
196 if old := open[b]; old != nil { |
2a4216c81e7b
Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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197 delete(open, b) |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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198 if old.b == b { |
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199 old.next = curr |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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200 curr.prev = old |
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201 } else { |
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202 old.prev = curr |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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203 curr.next = old |
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204 } |
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205 |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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206 if isClosed(old) { |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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207 rings = append(rings, old) |
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208 } |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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209 } else { |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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210 open[b] = curr |
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211 } |
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212 } |
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213 } |
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214 |
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215 if len(open) > 0 { |
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216 log.Printf("warn: open vertices left: %d\n", len(open)) |
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217 } |
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218 |
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219 if len(rings) == 0 { |
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220 log.Println("warn: no ring found") |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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221 return nil, removed |
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222 } |
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223 |
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224 curr := rings[0] |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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225 |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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226 polygon := LineStringZ{ |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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227 points[curr.a], |
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228 points[curr.b], |
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229 } |
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230 |
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231 for curr = curr.next; curr != rings[0]; curr = curr.next { |
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Estimated too large triangles as triangles which have an edge which is at least 3.5 times as long as the standard dev of the longest egde per inner triangle.
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232 polygon = append(polygon, points[curr.b]) |
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233 } |
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234 |
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235 polygon = append(polygon, t.Points[rings[0].a]) |
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236 |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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237 log.Printf("length of boundary: %d\n", len(polygon)) |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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238 |
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Extract the removed triangles from first triangulation, too. Useful to build a artifical DEM for second pass.
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239 return polygon, removed |
3604
6248a4bc10c7
Moved triangle elimination to triangulation code.
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240 } |
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Moved triangle elimination to triangulation code.
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241 |
2484
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Use fogleman's triangulation.
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242 func (t *Triangulation) TriangleSlices() [][]int32 { |
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243 sl := make([][]int32, len(t.Triangles)/3) |
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244 var j int |
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245 for i := range sl { |
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246 sl[i] = t.Triangles[j : j+3] |
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247 j += 3 |
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248 } |
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249 return sl |
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250 } |
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Use fogleman's triangulation.
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251 |
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252 func (t *Triangulation) Tin() *Tin { |
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253 |
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254 min := Vertex{math.MaxFloat64, math.MaxFloat64, math.MaxFloat64} |
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255 max := Vertex{-math.MaxFloat64, -math.MaxFloat64, -math.MaxFloat64} |
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256 |
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Use fogleman's triangulation.
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257 vertices := t.Points |
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258 |
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Use fogleman's triangulation.
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259 for _, v := range vertices { |
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260 min.Minimize(v) |
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261 max.Maximize(v) |
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Use fogleman's triangulation.
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262 } |
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263 |
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264 return &Tin{ |
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265 Vertices: vertices, |
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Use fogleman's triangulation.
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266 Triangles: t.TriangleSlices(), |
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Use fogleman's triangulation.
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267 Min: min, |
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Use fogleman's triangulation.
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268 Max: max, |
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Use fogleman's triangulation.
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269 } |
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Use fogleman's triangulation.
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270 } |