Mercurial > gemma
annotate pkg/octree/hull.go @ 4488:bff6c5c1db4f
client: pdf-gen: improve adding bottleneck info to pdf
* Check if the bottleneck is in the current view to add its info to the exported pdf and the pdf filename, this avoid wrong filename and wrong info in pdf in case view has been changed to another location.
* Set the bottleneck to print after moving to it in map.
author | Fadi Abbud <fadi.abbud@intevation.de> |
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date | Fri, 27 Sep 2019 11:15:02 +0200 |
parents | 620038ade708 |
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rev | line source |
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2483
620038ade708
Incorporated fogleman's fast Delaunay triangulation adjuted to our vertex model.
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1 // Copyright (C) 2018 Michael Fogleman |
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2 // |
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3 // Permission is hereby granted, free of charge, to any person obtaining |
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4 // a copy of this software and associated documentation files (the "Software"), |
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5 // to deal in the Software without restriction, including without limitation |
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6 // the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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7 // and/or sell copies of the Software, and to permit persons to whom the |
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8 // Software is furnished to do so, subject to the following conditions: |
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9 // |
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10 // The above copyright notice and this permission notice shall be included |
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11 // in all copies or substantial portions of the Software. |
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12 // |
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13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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14 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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16 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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17 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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18 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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19 |
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20 package octree |
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21 |
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22 import "sort" |
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23 |
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24 func cross2D(p, a, b Vertex) float64 { |
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25 return (a.X-p.X)*(b.Y-p.Y) - (a.Y-p.Y)*(b.X-p.X) |
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26 } |
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27 |
620038ade708
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28 // ConvexHull returns the convex hull of the provided points. |
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29 func ConvexHull(points []Vertex) []Vertex { |
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30 // copy points |
620038ade708
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31 pointsCopy := make([]Vertex, len(points)) |
620038ade708
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32 copy(pointsCopy, points) |
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33 points = pointsCopy |
620038ade708
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34 |
620038ade708
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parents:
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35 // sort points |
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36 sort.Slice(points, func(i, j int) bool { |
620038ade708
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37 a := points[i] |
620038ade708
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parents:
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38 b := points[j] |
620038ade708
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39 if a.X != b.X { |
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40 return a.X < b.X |
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41 } |
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42 return a.Y < b.Y |
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43 }) |
620038ade708
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44 |
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parents:
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45 // filter nearly-duplicate points |
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46 distinctPoints := points[:0] |
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47 for i, p := range points { |
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48 if i > 0 && p.SquaredDistance2D(points[i-1]) < eps { |
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49 continue |
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50 } |
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51 distinctPoints = append(distinctPoints, p) |
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52 } |
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53 points = distinctPoints |
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54 |
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55 // find upper and lower portions |
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56 var U, L []Vertex |
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57 for _, p := range points { |
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58 for len(U) > 1 && cross2D(U[len(U)-2], U[len(U)-1], p) > 0 { |
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59 U = U[:len(U)-1] |
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60 } |
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61 for len(L) > 1 && cross2D(L[len(L)-2], L[len(L)-1], p) < 0 { |
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62 L = L[:len(L)-1] |
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63 } |
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64 U = append(U, p) |
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65 L = append(L, p) |
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66 } |
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67 |
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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68 // reverse upper portion |
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69 for i, j := 0, len(U)-1; i < j; i, j = i+1, j-1 { |
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70 U[i], U[j] = U[j], U[i] |
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71 } |
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parents:
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72 |
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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73 // construct complete hull |
620038ade708
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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74 if len(U) > 0 { |
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parents:
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75 U = U[:len(U)-1] |
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parents:
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76 } |
620038ade708
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parents:
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77 if len(L) > 0 { |
620038ade708
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parents:
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78 L = L[:len(L)-1] |
620038ade708
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parents:
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79 } |
620038ade708
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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80 return append(L, U...) |
620038ade708
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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81 } |