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contributions/lib.imagetools/lib/components/imagetoolscalculator.cls.php

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<?php
Load::components('imagetoolsrect');

/**
 * Offers some often used calculations for image resizing et al.
 *
 * @ingroup ImageTools
 */
class ImageToolsCalculator {
        /**
         * Fit source into destination widthout changing ratio
         * 
         * Example: Fit 200x100 into 100x100 will result in 100x50
         * 
         * @param int $src_width Source width
         * @param int $src_height Source height
         * @param int $dst_width Destination width
         * @param int $dst_height Destiantion height
         * 
         * @return ImageToolsRect
         */
        public static function fit($src_width, $src_height, $dst_width, $dst_height) {
                if (($src_width / $src_height) == ($dst_width / $dst_height)) {
                        return new ImageToolsRect($dst_width, $dst_height);
                }
                
                $w_target = min($src_width, $dst_width);
                $h_target = min($src_height, $dst_height);
                
                $x_ratio = $w_target / $src_width;
                $y_ratio = $h_target / $src_height;
                $ratio = min($x_ratio, $y_ratio);
                
                $w_target = ceil($src_width * $ratio);
                $h_target = ceil($src_height * $ratio);
                
                return new ImageToolsRect($w_target, $h_target);                
        }
        
        /**
         * Center an image 
         *
         * @param int $src_width Source width
         * @param int $src_height Source height
         * @param int $dst_width Destination width
         * @param int $dst_height Destiantion height
         * 
         * @return ImageToolsRect
         */
        public static function center($src_width, $src_height, $dst_width, $dst_height) {
                $x_target = ($dst_width - $src_width) / 2;
                $y_target = ($dst_height - $src_height) / 2; 

                return new ImageToolsRect($src_width, $src_height, $x_target, $y_target);
        }
}

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