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<?php |
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/* |
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Plugin Name: Tonesque |
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Plugin URI: http://automattic.com/ |
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Description: Grab an average color representation from an image. |
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Version: 1.0 |
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Author: Automattic, Matias Ventura |
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Author URI: http://automattic.com/ |
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License: GNU General Public License v2 or later |
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License URI: http://www.gnu.org/licenses/gpl-2.0.html |
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*/ |
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|
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class Tonesque { |
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|
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private $image_url = ''; |
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private $image_obj = NULL; |
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private $color = ''; |
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|
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function __construct( $image_url ) { |
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if ( ! class_exists( 'Jetpack_Color' ) ) |
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jetpack_require_lib( 'class.color' ); |
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|
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$this->image_url = esc_url_raw( $image_url ); |
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$this->image_url = trim( $this->image_url ); |
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$this->image_url = apply_filters( 'tonesque_image_url', $this->image_url ); |
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|
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$this->image_obj = self::imagecreatefromurl( $this->image_url ); |
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} |
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|
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public static function imagecreatefromurl( $image_url ) { |
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// Grab the extension |
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$file = strtolower( pathinfo( $image_url, PATHINFO_EXTENSION ) ); |
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$file = explode( '?', $file ); |
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$file = $file[ 0 ]; |
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|
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switch ( $file ) { |
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case 'gif' : |
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$image_obj = imagecreatefromgif( $image_url ); |
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break; |
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case 'png' : |
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$image_obj = imagecreatefrompng( $image_url ); |
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break; |
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case 'jpg' : |
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case 'jpeg' : |
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$image_obj = imagecreatefromjpeg( $image_url ); |
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break; |
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default: |
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return false; |
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} |
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|
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return $image_obj; |
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} |
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|
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/** |
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* |
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* Construct object from image. |
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* |
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* @param optional $type (hex, rgb, hsl) |
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* @return color as a string formatted as $type |
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* |
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*/ |
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function color( $type = 'hex' ) { |
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// Bail if there is no image to work with |
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if ( ! $this->image_obj ) |
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return false; |
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|
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// Finds dominant color |
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$color = self::grab_color(); |
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// Passes value to Color class |
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$color = self::get_color( $color, $type ); |
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return $color; |
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} |
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|
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/** |
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* |
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* Grabs the color index for each of five sample points of the image |
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* |
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* @param $image |
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* @param $type can be 'index' or 'hex' |
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* @return array() with color indices |
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* |
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*/ |
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function grab_points( $type = 'index' ) { |
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$img = $this->image_obj; |
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if ( ! $img ) |
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return false; |
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|
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$height = imagesy( $img ); |
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$width = imagesx( $img ); |
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|
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// Sample five points in the image |
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// Based on rule of thirds and center |
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$topy = round( $height / 3 ); |
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$bottomy = round( ( $height / 3 ) * 2 ); |
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$leftx = round( $width / 3 ); |
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$rightx = round( ( $width / 3 ) * 2 ); |
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$centery = round( $height / 2 ); |
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$centerx = round( $width / 2 ); |
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|
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// Cast those colors into an array |
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$points = array( |
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imagecolorat( $img, $leftx, $topy ), |
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imagecolorat( $img, $rightx, $topy ), |
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imagecolorat( $img, $leftx, $bottomy ), |
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imagecolorat( $img, $rightx, $bottomy ), |
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imagecolorat( $img, $centerx, $centery ), |
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); |
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|
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if ( 'hex' == $type ) { |
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foreach ( $points as $i => $p ) { |
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$c = imagecolorsforindex( $img, $p ); |
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$points[ $i ] = self::get_color( array( |
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'r' => $c['red'], |
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'g' => $c['green'], |
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'b' => $c['blue'], |
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), 'hex' ); |
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} |
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} |
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|
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return $points; |
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} |
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|
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/** |
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* |
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* Finds the average color of the image based on five sample points |
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* |
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* @param $image |
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* @return array() with rgb color |
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* |
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*/ |
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function grab_color() { |
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$img = $this->image_obj; |
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if ( ! $img ) |
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return false; |
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|
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$rgb = self::grab_points(); |
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|
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// Process the color points |
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// Find the average representation |
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foreach ( $rgb as $color ) { |
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$index = imagecolorsforindex( $img, $color ); |
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$r[] = $index['red']; |
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$g[] = $index['green']; |
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$b[] = $index['blue']; |
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|
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$red = round( array_sum( $r ) / 5 ); |
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$green = round( array_sum( $g ) / 5 ); |
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$blue = round( array_sum( $b ) / 5 ); |
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} |
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|
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// The average color of the image as rgb array |
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$color = array( |
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'r' => $red, |
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'g' => $green, |
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'b' => $blue, |
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); |
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|
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return $color; |
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} |
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|
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/** |
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* |
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* Get a Color object using /lib class.color |
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* Convert to appropriate type |
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* |
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* @return string |
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* |
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*/ |
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function get_color( $color, $type ) { |
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$c = new Jetpack_Color( $color, 'rgb' ); |
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$this->color = $c; |
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|
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switch ( $type ) { |
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case 'rgb' : |
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$color = implode( $c->toRgbInt(), ',' ); |
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break; |
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case 'hex' : |
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$color = $c->toHex(); |
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break; |
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case 'hsv' : |
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$color = implode( $c->toHsvInt(), ',' ); |
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break; |
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default: |
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return $color = $c->toHex(); |
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} |
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|
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return $color; |
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} |
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|
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/** |
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* |
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* Checks contrast against main color |
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* Gives either black or white for using with opacity |
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* |
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* @return string |
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* |
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*/ |
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function contrast() { |
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if ( ! $this->color ) |
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return false; |
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|
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$c = $this->color->getMaxContrastColor(); |
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return implode( $c->toRgbInt(), ',' ); |
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} |
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|
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}; |
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|
