Mercurial > gemma
annotate pkg/octree/classbreaks.go @ 3837:92e9794ab62a sld-colors
Merged default into sld-color branch.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Fri, 05 Jul 2019 12:26:49 +0200 |
parents | 631f5eaf29de |
children | 37d5c4441c70 |
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) 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 "context" |
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18 "database/sql" |
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19 "errors" |
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20 "math" |
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21 "sort" |
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22 "strconv" |
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23 "strings" |
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24 ) |
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25 |
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26 const ( |
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27 selectClassBreaksSQL = ` |
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28 SELECT config_val FROM sys_admin.system_config |
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29 WHERE config_key = $1` |
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30 ) |
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31 |
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32 func SampleDiffHeights(min, max, step float64) []float64 { |
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33 var heights []float64 |
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34 switch { |
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35 case min >= 0: // All values positive. |
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36 for v := 0.0; v <= max; v += step { |
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37 if v >= min { |
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38 heights = append(heights, v) |
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39 } |
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40 } |
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41 case max <= 0: // All values negative. |
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42 for v := 0.0; v >= min; v -= step { |
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43 if v <= max { |
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44 heights = append(heights, v) |
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45 } |
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46 } |
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47 default: // Positive and negative. |
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48 for v := step; v <= max; v += step { |
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49 heights = append(heights, v) |
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50 } |
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51 for i, j := 0, len(heights)-1; i < j; i, j = i+1, j-1 { |
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52 heights[i], heights[j] = heights[j], heights[i] |
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53 } |
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54 for v := 0.0; v >= min; v -= step { |
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55 heights = append(heights, v) |
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56 } |
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57 } |
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58 return heights |
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59 } |
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60 |
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61 func LoadClassBreaks(ctx context.Context, tx *sql.Tx, key string) ([]float64, error) { |
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62 |
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63 var config sql.NullString |
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64 |
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65 err := tx.QueryRowContext(ctx, selectClassBreaksSQL, key).Scan(&config) |
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66 |
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67 switch { |
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68 case err == sql.ErrNoRows: |
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69 return nil, nil |
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70 case err != nil: |
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71 return nil, err |
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72 case !config.Valid: |
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73 return nil, errors.New("Invalid config string") |
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74 } |
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75 |
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76 parts := strings.Split(config.String, ",") |
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77 classes := make([]float64, 0, len(parts)) |
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78 for _, part := range parts { |
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79 if idx := strings.IndexRune(part, ':'); idx >= 0 { |
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80 part = part[idx+1:] |
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81 } |
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82 if part = strings.TrimSpace(part); part == "" { |
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83 continue |
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84 } |
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85 v, err := strconv.ParseFloat(part, 64) |
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86 if err != nil { |
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87 return nil, err |
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88 } |
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89 classes = append(classes, v) |
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90 } |
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91 |
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92 sort.Float64s(classes) |
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93 return classes, nil |
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94 } |
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95 |
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96 func InBetweenClassBreaks(cbs []float64, min float64, steps int) []float64 { |
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97 if len(cbs) < 2 || steps < 2 { |
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98 return cbs |
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99 } |
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100 |
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101 out := make([]float64, 1, len(cbs)*steps) |
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102 |
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103 out[0] = cbs[0] |
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104 |
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105 _1steps := 1 / float64(steps) |
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106 |
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107 for i := 1; i < len(cbs); i++ { |
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108 last, curr := cbs[i-1], cbs[i] |
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109 |
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110 // Gap already too small -> proceed with next gap. |
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111 diff := curr - last |
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First preparation to use custom classbreaks in contour generation.
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112 if math.Abs(diff) < min { |
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First preparation to use custom classbreaks in contour generation.
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113 out = append(out, curr) |
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First preparation to use custom classbreaks in contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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114 continue |
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First preparation to use custom classbreaks in contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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115 } |
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First preparation to use custom classbreaks in contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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116 |
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First preparation to use custom classbreaks in contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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117 delta := diff * _1steps |
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First preparation to use custom classbreaks in contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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118 for p := last + delta; p < curr; p += delta { |
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First preparation to use custom classbreaks in contour generation.
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119 out = append(out, p) |
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First preparation to use custom classbreaks in contour generation.
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120 } |
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First preparation to use custom classbreaks in contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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121 |
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First preparation to use custom classbreaks in contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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122 out = append(out, curr) |
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First preparation to use custom classbreaks in contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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123 } |
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First preparation to use custom classbreaks in contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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124 |
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First preparation to use custom classbreaks in contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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125 return out |
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First preparation to use custom classbreaks in contour generation.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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126 } |