Mercurial > gemma
annotate pkg/octree/slice.go @ 3811:37e896990c99 yworks-svg2pdf
client: improve pdf generation towards vector diagrams
* Moving AvailableFairwayDepth.vue addDiagram to svg2pdf.
* Mark the scaling and aspect ration as todos for both vector diagrams
in pdf generation AvailableFairwayDepth.vue and Waterlevel.vue.
author | Bernhard Reiter <bernhard@intevation.de> |
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date | Fri, 05 Jul 2019 10:50:55 +0200 |
parents | 7686c7c23506 |
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rev | line source |
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2572
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1 // This is Free Software under GNU Affero General Public License v >= 3.0 |
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2 // without warranty, see README.md and license for details. |
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3 // |
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4 // SPDX-License-Identifier: AGPL-3.0-or-later |
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5 // License-Filename: LICENSES/AGPL-3.0.txt |
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6 // |
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7 // Copyright (C) 2018, 2019 by via donau |
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH |
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9 // Software engineering by Intevation GmbH |
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10 // |
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11 // Author(s): |
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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13 |
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14 package octree |
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15 |
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16 import ( |
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17 "runtime" |
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18 "sync" |
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19 ) |
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20 |
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21 type PointMap map[Point]float64 |
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22 |
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23 func (pm PointMap) Triangulate() (*Triangulation, error) { |
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24 vertices := make([]Vertex, len(pm)) |
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25 var i int |
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26 for p, z := range pm { |
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27 vertices[i] = Vertex{X: p.X, Y: p.Y, Z: z} |
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28 i++ |
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29 } |
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30 return Triangulate(vertices) |
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31 } |
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32 |
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33 func sliceWork( |
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34 vs []Vertex, |
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35 dst PointMap, |
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36 fn func([]Vertex, func([]Vertex) []Vertex), |
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37 ) { |
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38 n := runtime.NumCPU() |
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39 |
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40 wg := new(sync.WaitGroup) |
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41 |
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42 slices := make(chan []Vertex) |
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43 out := make(chan []Vertex) |
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44 |
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45 pool := make(chan []Vertex, n) |
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46 |
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47 const pageSize = 2048 |
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48 |
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49 turn := func(p []Vertex) []Vertex { |
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50 if p != nil { |
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51 out <- p |
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52 } |
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53 select { |
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54 case p = <-pool: |
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55 default: |
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56 p = make([]Vertex, 0, pageSize) |
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57 } |
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58 return p |
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59 } |
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60 |
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61 for i := 0; i < n; i++ { |
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62 wg.Add(1) |
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63 go func() { |
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64 defer wg.Done() |
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65 for slice := range slices { |
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66 fn(slice, turn) |
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67 } |
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68 }() |
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69 } |
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70 done := make(chan struct{}) |
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71 go func() { |
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72 defer close(done) |
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73 for s := range out { |
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74 for i := range s { |
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75 v := &s[i] |
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76 key := Point{X: v.X, Y: v.Y} |
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77 if z, found := dst[key]; found { |
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78 dst[key] = (z + v.Z) * 0.5 |
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79 } else { |
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80 dst[key] = v.Z |
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81 } |
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82 } |
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83 select { |
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84 case pool <- s[:0:pageSize]: |
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85 default: |
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86 } |
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87 } |
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88 }() |
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89 |
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90 size := len(vs)/n + 1 |
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91 for len(vs) > 0 { |
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92 var l int |
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93 if len(vs) < size { |
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94 l = len(vs) |
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95 } else { |
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96 l = size |
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97 } |
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98 slices <- vs[:l] |
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99 vs = vs[l:] |
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100 } |
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101 close(slices) |
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102 wg.Wait() |
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103 close(out) |
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104 <-done |
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105 } |