Mercurial > gemma
annotate pkg/models/colors.go @ 5413:99f32f0dc70c marking-single-beam
Added tools to classify vertices by their heights with class breaks.
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Wed, 07 Jul 2021 11:42:25 +0200 |
parents | 18d5461bec5d |
children |
rev | line source |
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3854
3fcc4e11fc00
Validate the config values of the morpho classes when saving. Also don't trigger the expensive re-calculation of the contour lines if only the colors changed.
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parents:
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1 // This is Free Software under GNU Affero General Public License v >= 3.0 |
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Validate the config values of the morpho classes when saving. Also don't trigger the expensive re-calculation of the contour lines if only the colors changed.
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2 // without warranty, see README.md and license for details. |
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Validate the config values of the morpho classes when saving. Also don't trigger the expensive re-calculation of the contour lines if only the colors changed.
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3 // |
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Validate the config values of the morpho classes when saving. Also don't trigger the expensive re-calculation of the contour lines if only the colors changed.
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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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Validate the config values of the morpho classes when saving. Also don't trigger the expensive re-calculation of the contour lines if only the colors changed.
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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 // * Markus Kottländer <markus.kottlaender@intevation.de> |
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14 |
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15 package models |
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16 |
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17 import ( |
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18 "fmt" |
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19 "image/color" |
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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 type ( |
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27 // ColorValue models a tuple of a floating point value and a color. |
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28 ColorValue struct { |
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29 Value float64 |
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30 Color color.RGBA |
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31 } |
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Validate the config values of the morpho classes when saving. Also don't trigger the expensive re-calculation of the contour lines if only the colors changed.
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32 |
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33 // ColorValues are a list of color values. |
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34 // Colors between the given ones are linear interpolated. |
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35 ColorValues []ColorValue |
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36 |
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37 // ClassBreak is a potential open interval of values associated |
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38 // with a color. |
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39 ClassBreak struct { |
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40 High float64 |
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41 HasHigh bool |
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42 Low float64 |
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43 HasLow bool |
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44 Col color.RGBA |
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45 } |
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46 ) |
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47 |
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48 // Color gives a HTML compatible string representation of the color |
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49 // of the class break. |
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50 func (cb *ClassBreak) Color() string { |
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51 return fmt.Sprintf("#%02x%02x%02x", |
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52 cb.Col.R, |
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53 cb.Col.G, |
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54 cb.Col.B, |
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55 ) |
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56 } |
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57 |
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58 // ClassBreaks converts a list of colors to a list of class breaks. |
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59 // The first an the last class break are open on the respective end. |
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60 func (cc ColorValues) ClassBreaks() []ClassBreak { |
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61 |
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62 cbs := make([]ClassBreak, len(cc), len(cc)+1) |
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63 for i := range cc { |
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64 if i > 0 { |
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65 cbs[i].Low = cc[i-1].Value |
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66 cbs[i].HasLow = true |
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67 } |
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68 cbs[i].High = cc[i].Value |
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69 cbs[i].HasHigh = true |
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70 cbs[i].Col = cc[i].Color |
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71 } |
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72 if len(cc) > 0 { |
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73 cbs = append(cbs, ClassBreak{ |
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74 Col: cc[len(cc)-1].Color, |
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75 Low: cc[len(cc)-1].Value, |
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76 HasLow: true, |
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77 }) |
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78 } |
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79 |
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80 return cbs |
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81 } |
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82 |
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83 // Heights extracts the values friom the color value pairs. |
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84 func (cc ColorValues) Heights() []float64 { |
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85 heights := make([]float64, len(cc)) |
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86 for i := range cc { |
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87 heights[i] = cc[i].Value |
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88 } |
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89 return heights |
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90 } |
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91 |
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92 // Clip does the same as Interpolate |
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93 // but if the value is out of bounds the value of the nearest border |
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94 // is returned. |
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95 func (cc ColorValues) Clip(v float64) color.RGBA { |
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96 if len(cc) == 0 { |
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97 return color.RGBA{} |
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98 } |
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99 if v < cc[0].Value { |
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100 return cc[0].Color |
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101 } |
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102 if v > cc[len(cc)-1].Value { |
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103 return cc[len(cc)-1].Color |
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104 } |
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105 c, _ := cc.Interpolate(v) |
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106 return c |
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107 } |
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108 |
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109 // Interpolate interpolates the color linearly between the |
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110 // given values of the color values. |
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111 // If the value is out of bounds false is returned. |
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112 func (cc ColorValues) Interpolate(v float64) (color.RGBA, bool) { |
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113 if len(cc) == 0 || v < cc[0].Value || v > cc[len(cc)-1].Value { |
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114 return color.RGBA{}, false |
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115 } |
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116 |
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117 if len(cc) == 1 { |
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118 return cc[0].Color, cc[0].Value == v |
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119 } |
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120 |
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121 for i := 0; i < len(cc)-1; i++ { |
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122 v1 := cc[i].Value |
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123 v2 := cc[i+1].Value |
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124 if v1 <= v && v <= v2 { |
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125 // f(v1) = 0 |
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126 // f(v2) = 1 |
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127 // 0 = m*v1 + c <=> c = -m*v1 |
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128 // 1 = m*v2 + c |
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129 // (1 - 0) = m*(v2 - v1) |
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130 // m = 1/(v2 - v1) for v2 != v1 |
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131 |
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132 if v1 == v2 { |
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133 return color.RGBA{ |
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134 R: uint8((uint16(cc[i].Color.R) + uint16(cc[i+1].Color.R)) / 2), |
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135 G: uint8((uint16(cc[i].Color.G) + uint16(cc[i+1].Color.G)) / 2), |
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136 B: uint8((uint16(cc[i].Color.B) + uint16(cc[i+1].Color.B)) / 2), |
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137 A: 0xff, |
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138 }, true |
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139 } |
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140 m := 1 / (v2 - v1) |
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141 c := -m * v1 |
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142 s := v*m + c |
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143 |
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144 interpolate := func(a, b uint8) uint8 { |
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145 v := math.Round(float64(a) + (float64(b)-float64(a))*s) |
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146 if v < 0 { |
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147 return 0 |
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148 } |
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149 if v > 255 { |
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150 return 255 |
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151 } |
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152 return uint8(v) |
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153 } |
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154 |
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155 return color.RGBA{ |
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156 R: interpolate(cc[i].Color.R, cc[i+1].Color.R), |
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157 G: interpolate(cc[i].Color.G, cc[i+1].Color.G), |
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158 B: interpolate(cc[i].Color.B, cc[i+1].Color.B), |
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159 A: 0xff, |
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160 }, true |
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161 } |
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162 } |
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163 |
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164 return color.RGBA{}, false |
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165 } |
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166 |
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167 // ParseColorValues parses a string to a list of color values. |
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168 // The value/color pairs are separated by ','. |
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169 // A color/value pair is separated with ':'. |
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170 // f ':' is missing it is assumed that only the value is given. |
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171 // The missing color is interpolated from fore and aftermost |
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172 // value/colors pairs. |
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173 func ParseColorValues(s string) (ColorValues, error) { |
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174 |
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175 var err error |
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176 |
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177 parseFloat := func(s string) float64 { |
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178 var v float64 |
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179 if err == nil { |
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180 v, err = strconv.ParseFloat(s, 64) |
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181 } |
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182 return v |
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183 } |
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184 |
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185 parseColor := func(s string) color.RGBA { |
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186 if err != nil { |
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187 return color.RGBA{} |
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188 } |
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189 s = strings.Map(func(r rune) rune { |
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190 if ('0' <= r && r <= '9') || |
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191 ('a' <= r && r <= 'f') || |
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192 ('A' <= r && r <= 'F') { |
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193 return r |
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194 } |
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195 return -1 |
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196 }, s) |
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197 |
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198 var v int64 |
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199 v, err = strconv.ParseInt(s, 16, 64) |
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200 return color.RGBA{ |
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201 R: uint8(v >> 16), |
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202 G: uint8(v >> 8), |
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203 B: uint8(v >> 0), |
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204 A: 0xff, |
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205 } |
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206 } |
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207 |
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208 lines := strings.Split(s, ",") |
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209 |
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210 // first pass: find defined colors |
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211 var defined ColorValues |
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212 |
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213 for _, line := range lines { |
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214 // ignore the lines w/o a color. |
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215 if !strings.ContainsRune(line, ':') { |
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216 continue |
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217 } |
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218 parts := strings.SplitN(line, ":", 2) |
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219 if len(parts) < 2 { |
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220 continue |
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221 } |
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222 value := parseFloat(parts[0]) |
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223 color := parseColor(parts[1]) |
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224 |
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225 defined = append(defined, ColorValue{ |
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226 Value: value, |
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227 Color: color, |
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228 }) |
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229 } |
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230 |
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231 if err != nil { |
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232 return nil, err |
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233 } |
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234 |
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235 sort.Slice(defined, func(i, j int) bool { |
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236 return defined[i].Value < defined[j].Value |
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237 }) |
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238 |
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239 // second pass: interpolate the rest |
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240 var final ColorValues |
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241 for _, line := range lines { |
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242 if idx := strings.IndexRune(line, ':'); idx >= 0 { |
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243 line = line[:idx] |
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244 } |
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245 value := parseFloat(line) |
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246 if color, ok := defined.Interpolate(value); ok { |
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247 final = append(final, ColorValue{ |
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248 Value: value, |
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249 Color: color, |
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250 }) |
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251 } |
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252 } |
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253 |
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254 return final, err |
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255 } |