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<?php |
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/** |
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* The 'check' class |
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*/ |
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namespace projectcleverweb\color; |
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/** |
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* The 'check' class |
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*/ |
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class check { |
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/** |
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* Checks if a RGB color appears as a darker or lighter color using YIQ |
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* color weights |
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* |
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* @param int $r The red value |
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* @param int $g The green value |
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* @param int $b The blue value |
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* @param int $check_score The minimum score to check, a number in the range of 0 - 255 |
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* @return boolean If the YIQ score is >= $check_score returns FALSE, otherwise TRUE |
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*/ |
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public static function is_dark(int $r = 0, int $g = 0, int $b = 0, int $check_score = 128) :bool { |
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if (generate::yiq_score($r, $g, $b) >= $check_score) { |
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return FALSE; |
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} |
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return TRUE; |
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} |
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/** |
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* Measures the visual contrast of 2 RGB colors. |
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* |
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* NOTE: most colors do not have a 100% contrasting opposite, but all colors |
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* do have a contrasting opposite that is at least 50%. |
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* |
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* @param array $rgb1 The first color, array where offsets 'r', 'g', & 'b' contain their respective values. |
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* @param array $rgb2 The second color, array where offsets 'r', 'g', & 'b' contain their respective values. |
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* @return float The visual contrast as a percentage (e.g. 12.345) |
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*/ |
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public static function rgb_contrast($rgb1, $rgb2) { |
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$r = (max($rgb1['r'], $rgb2['r']) - min($rgb1['r'], $rgb2['r'])) * 299; |
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$g = (max($rgb1['g'], $rgb2['g']) - min($rgb1['g'], $rgb2['g'])) * 587; |
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$b = (max($rgb1['b'], $rgb2['b']) - min($rgb1['b'], $rgb2['b'])) * 114; |
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// Sum => Average => Convert to percentage |
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return ($r + $g + $b) / 1000 / 2.55; |
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} |
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} |
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ProjectCleverWeb /
PHP-Color
