Mercurial > gemma

annotate pkg/models/colors.go @ 5415:4ad68ab239b7 marking-single-beam

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Factored creation of default class breaks in SR import to be reused with markings, too.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 07 Jul 2021 12:01:28 +0200
parents 18d5461bec5d
children
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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) 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 // * 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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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 }