ColorService.php
| 1 | <?php |
| 2 | |
| 3 | namespace SureCart\Support; |
| 4 | |
| 5 | /** |
| 6 | * Color service. |
| 7 | */ |
| 8 | class ColorService { |
| 9 | /** |
| 10 | * Calculate the foreground color based on the background color. |
| 11 | * |
| 12 | * @param string $color The background color. |
| 13 | * @return string The foreground color. |
| 14 | */ |
| 15 | public function calculateForegroundColor( $color ) { |
| 16 | list($red, $green, $blue) = $this->destructureColorToRgb( $color ); |
| 17 | $brightness = $this->calculateBrightness( $red, $green, $blue ); |
| 18 | return $this->allocateWhiteOrBlack( $brightness ); |
| 19 | } |
| 20 | |
| 21 | /** |
| 22 | * Destructure the color to RGB. |
| 23 | * |
| 24 | * @param string $color The color. |
| 25 | */ |
| 26 | private function destructureColorToRgb( $color ) { |
| 27 | return str_split( $color, 2 ); |
| 28 | } |
| 29 | |
| 30 | /** |
| 31 | * Calculate the brightness. |
| 32 | * |
| 33 | * @param string $red The red. |
| 34 | * @param string $green The green. |
| 35 | * @param string $blue The blue. |
| 36 | * @return string |
| 37 | */ |
| 38 | private function calculateBrightness( $red, $green, $blue ) { |
| 39 | return ( hexdec( $red ) * 0.299 ) + ( hexdec( $green ) * 0.587 ) + ( hexdec( $blue ) * 0.114 ); |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * Allocate white or black. |
| 44 | * |
| 45 | * @param string $brightness The brightness. |
| 46 | * @return string |
| 47 | */ |
| 48 | private function allocateWhiteOrBlack( $brightness ) { |
| 49 | return ( $brightness > 180 ) ? '000000' : 'ffffff'; |
| 50 | } |
| 51 | } |
| 52 |