/**
* Rotate the image clockwise
*
* @param Asido_TMP &$tmp
* @param float $angle
* @param Asido_Color &$color
* @return boolean
* @access protected
*/
function __rotate(&$tmp, $angle, &$color)
{
// skip full loops
//
if ($angle % 360 == 0) {
return true;
}
$a = $tmp->image_height;
$b = $tmp->image_width;
// do the virtual `border`
//
$c = $a * cos(deg2rad($angle)) * sin(deg2rad($angle));
$d = $b * cos(deg2rad($angle)) * sin(deg2rad($angle));
// do the rest of the math
//
$a2 = $b * sin(deg2rad($angle)) + $a * cos(deg2rad($angle));
$b2 = $a * sin(deg2rad($angle)) + $b * cos(deg2rad($angle));
$a3 = 2 * $d + $a;
$b3 = 2 * $c + $b;
$a4 = $b3 * sin(deg2rad($angle)) + $a3 * cos(deg2rad($angle));
$b4 = $a3 * sin(deg2rad($angle)) + $b3 * cos(deg2rad($angle));
// create the `border` canvas
//
$t = $this->__canvas($b + 2 * $c, $a + 2 * $d, $color);
// copy the image
//
imagick_composite($t->target, IMAGICK_COMPOSITE_OP_OVER, $tmp->target, $c, $d);
// rotate the whole thing
//
imagick_rotate($t->target, $angle);
// `final` result
//
$f = $this->__canvas($b2, $a2, $color);
imagick_composite($f->target, IMAGICK_COMPOSITE_OP_OVER, $t->target, -(floor($b4) - $b2) / 2, -(floor($a4) - $a2) / 2);
$this->__destroy_target($t);
$this->__destroy_target($tmp);
$tmp->target = $f->target;
$tmp->image_width = $b2;
$tmp->image_height = $a2;
return true;
}
/**
* Copy one image to another
*
* @param Asido_TMP &$tmp_target
* @param Asido_TMP &$tmp_source
* @param integer $destination_x
* @param integer $destination_y
* @return boolean
* @access protected
*/
function __copy(&$tmp_target, &$tmp_source, $destination_x, $destination_y)
{
return imagick_composite($tmp_target->target, IMAGICK_COMPOSITE_OP_OVER, $tmp_source->source, $destination_x, $destination_y);
}
