Mercurial > gemma

annotate pkg/octree/contours.go @ 3540:b268cae2df39

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merge with branch password
author Thomas Junk <thomas.junk@intevation.de>
date Fri, 31 May 2019 09:34:31 +0200
parents 647a58ee9ae9
children 631f5eaf29de
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rev   line source
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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 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 // * Tom Gottfried <tom.gottfried@intevation.de>
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14
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15 package octree
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16
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17 import (
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18 "runtime"
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19 "sync"
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20 )
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21
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22 func SampleDiffHeights(min, max, step float64) []float64 {
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23 var heights []float64
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24 switch {
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25 case min >= 0: // All values positive.
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26 for v := 0.0; v <= max; v += step {
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27 if v >= min {
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28 heights = append(heights, v)
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29 }
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30 }
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31 case max <= 0: // All values negative.
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32 for v := 0.0; v >= min; v -= step {
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33 if v <= max {
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34 heights = append(heights, v)
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35 }
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36 }
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37 default: // Positive and negative.
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38 for v := step; v <= max; v += step {
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39 heights = append(heights, v)
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40 }
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41 for i, j := 0, len(heights)-1; i < j; i, j = i+1, j-1 {
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42 heights[i], heights[j] = heights[j], heights[i]
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43 }
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44 for v := 0.0; v >= min; v -= step {
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45 heights = append(heights, v)
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46 }
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47 }
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48 return heights
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49 }
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50
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51 // ContourResult stores an calculated iso line for a given height.
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52 // Is used as a future variable in the concurrent iso line calculation.
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53 type ContourResult struct {
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54 Height float64
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55 Lines MultiLineStringZ
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56
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57 done bool
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58 mu sync.Mutex
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59 cond *sync.Cond
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60 }
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61
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62 // NewContourResult prepares a future variable to later hold
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63 // the result of the iso line calculation.
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64 func NewContourResult(height float64) *ContourResult {
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65 cr := ContourResult{Height: height}
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66 cr.cond = sync.NewCond(&cr.mu)
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67 return &cr
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68 }
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69
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70 func (cr *ContourResult) wait() {
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71 cr.cond.L.Lock()
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72 for !cr.done {
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73 cr.cond.Wait()
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74 }
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75 cr.cond.L.Unlock()
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76 }
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77
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78 func (cr *ContourResult) get() float64 {
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79 cr.cond.L.Lock()
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80 defer cr.cond.L.Unlock()
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81 return cr.Height
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82 }
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83
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84 func (cr *ContourResult) set(lines MultiLineStringZ) {
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85 cr.cond.L.Lock()
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86 defer cr.cond.L.Unlock()
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87 cr.Lines = lines
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88 cr.done = true
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89 cr.cond.Signal()
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90 }
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91
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92 // DoContours calculates the iso line for the given heights.
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93 // This is done concurrently.
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94 // It is guaranteed that the results are given to the store
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95 // function in order of the original heights values.
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96 func DoContours(tree *Tree, heights []float64, store func(*ContourResult)) {
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97
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98 if len(heights) == 0 {
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99 return
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100 }
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101
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102 contours := make([]*ContourResult, len(heights))
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103
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104 for i, h := range heights {
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105 contours[i] = NewContourResult(h)
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106 }
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107
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108 jobs := make(chan *ContourResult)
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109
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110 var wg sync.WaitGroup
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111 for i, n := 0, runtime.NumCPU(); i < n; i++ {
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112 wg.Add(1)
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113 go processLevels(tree, jobs, &wg)
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114 }
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115
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116 done := make(chan struct{})
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117 go func() {
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118 defer close(done)
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119 for _, cr := range contours {
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120 cr.wait()
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121 store(cr)
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122 }
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123 }()
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124
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125 for _, cr := range contours {
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126 jobs <- cr
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127 }
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128 close(jobs)
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129
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130 wg.Wait()
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131 <-done
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132 }
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133
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134 func processLevels(
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135 tree *Tree,
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136 jobs <-chan *ContourResult,
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137 wg *sync.WaitGroup,
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138 ) {
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139 defer wg.Done()
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140 for cr := range jobs {
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141 var lines MultiLineStringZ
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142 h := cr.get()
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143 tree.Horizontal(h, func(t *Triangle) {
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144 line := t.IntersectHorizontal(h)
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145 if len(line) > 1 {
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146 lines = append(lines, line)
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147 }
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148 })
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149 cr.set(lines.Merge())
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150 }
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151 }