Ho messo appunto un sistema di calcolo Width e Height dinamico... ma è performante?

[n0t]

Originariamente inviato da filippo.toso
Mah, non vedo il motivo di utilizzare dei cicli per eseguire delle semplici operazioni matematiche:

<?php 

function constrain(&$width, &$height, $maxwidth = false, $maxheight = false, $round = true) {

    $maxwidth  = $maxwidth  === false ? $width  : $maxwidth;
    $maxheight = $maxheight === false ? $height : $maxheight;

    $wscale = $width  / $maxwidth;
    $hscale = $height / $maxheight;
    
    if ($wscale > $hscale) {
        $height = $height * $maxwidth / $width; 
        $width  = $maxwidth;    
    } else {
        $width  = $width * $maxheight / $height; 
        $height = $maxheight;    
    }
    
    $width  = $round ? round($width)  : $width;
    $height = $round ? round($height) : $height;

}

function offset($width, $height, $maxwidth, $maxheight) {
    
    $left  = round(($maxwidth - $width) / 2);
    $right = $maxwidth - $width - $left;
    
    $top  = round(($maxheight - $height) / 2);
    $bottom = $maxheight - $height - $top;
    
    return array('left' => $left, 'right'  => $right, 
                 'top'  => $top,  'bottom' => $bottom);
                 
}

$width  = 300;
$height = 200;

$maxwidth  = 100;
$maxheight = 100;

constrain($width, $height, $maxwidth, $maxheight);

print($width . ' ' . $height);

$offset = offset($width, $height, $maxwidth, $maxheight);

print('<pre>');
print_r($offset);
print('</pre>');

?>

Mh Mh Mh.. bella O_o