/**
* "Умное" создание миниатюр.
*
* @param int ширина
* @param int высота
* @param float коэффициент превышения.
* @throws IllegalArgumentException
* @return AcImage
*/
public function thumbnail($width, $height, $c = 2)
{
if ($c <= 1 || !is_finite($c) || $width <= 0 || $height <= 0) {
throw new IllegalArgumentException();
}
$size = new Size($width, $height);
if ($this->getSize()->lessThen($size)) {
$size = $this->getSize();
}
$imageSize = $this->getSize();
$isRotate = false;
if ($size->getWidth() / $imageSize->getWidth() <= $size->getHeight() / $imageSize->getHeight()) {
$size->flip();
$imageSize->flip();
$isRotate = true;
}
$width = $size->getWidth();
$height = $size->getHeight();
$imageWidth = $imageSize->getWidth();
$imageHeight = $imageSize->getHeight();
$lim = (int) ($c * $height);
$newHeight = (int) ($imageHeight * $width / $imageWidth);
if ($imageWidth > $width) {
if ($newHeight <= $lim) {
$size = new Size($width, $newHeight);
} else {
if ($newHeight <= 2 * $lim) {
$size = new Size((int) ($imageWidth * $lim / $imageHeight), $lim);
} else {
$size = new Size((int) ($width / 2), (int) ($imageHeight * $width / $imageWidth));
}
}
} else {
if ($imageHeight <= $lim) {
$size = $this->getSize();
} else {
if ($imageHeight <= 2 * $lim) {
if ($imageWidth * $lim / $imageHeight >= $width / 2) {
$size = new Size((int) ($imageWidth * $lim / $imageHeight), $lim);
} else {
$size = new Size((int) ($width / 2), (int) ($imageHeight * $width / ($imageWidth * 2)));
}
} else {
$size = new Size((int) ($width / 2), (int) ($imageHeight * $width / ($imageWidth * 2)));
}
}
}
if ($isRotate) {
$size->flip();
$imageSize->flip();
}
return $this->resize($size);
}