ProjectCleverWeb /
PHP-Color
| @@ 175-184 (lines=10) @@ | ||
| 172 | * @param float $hue The hue to convert |
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| 173 | * @return float The resulting Y |
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| 174 | */ |
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| 175 | public static function hue_to_yiq(float $hue) :float { |
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| 176 | if ($hue < 60) { |
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| 177 | return $hue * 2.5254237288136; |
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| 178 | } elseif ($hue < 180) { |
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| 179 | return 150 + ($hue - 60) * 4.9243697478992; |
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| 180 | } elseif ($hue < 300) { |
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| 181 | return 737 + ($hue - 180) * 0.94957983193277; |
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| 182 | } |
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| 183 | return 851 + ($hue - 300) * 2.5254237288136; |
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| 184 | } |
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| 185 | ||
| 186 | /** |
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| 187 | * Converts a "Y" to the hue spectrum |
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| @@ 192-201 (lines=10) @@ | ||
| 189 | * @param float $yiq The "Y" to convert |
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| 190 | * @return float The resulting hue |
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| 191 | */ |
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| 192 | public static function yiq_to_hue(float $yiq) :float { |
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| 193 | if ($yiq < 150) { |
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| 194 | return $yiq * 0.39597315436242; |
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| 195 | } elseif ($yiq < 737) { |
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| 196 | return 60 + ($yiq - 150) * 0.20307167235495; |
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| 197 | } elseif ($yiq < 851) { |
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| 198 | return 180 + ($yiq - 737) * 1.0530973451327; |
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| 199 | } |
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| 200 | return 300 + ($yiq - 851) * 0.39597315436242; |
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| 201 | } |
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| 202 | } |
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| 203 | ||
