Question

i have a image manipulation class, i want to create images that always fill the entire new width and height so there are no borders/solid color background, i just cant understand how i can make it always fill the height and width (mantaining the aspect ratio of the uploaded image) if the image width AND height are smaller than the new image size..

just like the zoomcrop (zc=1) from phpthumb class (i looked the code from it but i couldnt mimic the behavior)

    public function resizeCrop($newwidth, $newheight) {

                        ...

            $x = $this->getX();
            $y = $this->getY();

            ...

            else if ($x < $newwidth && $y < $newheight)
            {

            // logic ??

            }

    }

Answer 1

You need to make sure that the smaller (relative to the aspect ratio of the original image and that of container) side is zoomed to maximum. Have a look at this code:

public function resizeCrop($newwidth, $newheight) {
                ...
    $x = $this->getX();
    $y = $this->getY();

    // old images width will fit
    if(($x / $y) < ($newwidth/$newheight)){
        $scale = $newwidth/$x;
        $newX = 0;
        $newY = - ($scale * $y - $newheight) / 2;

    // else old image's height will fit
    }else{
        $scale = $newheight/$y;
        $newX = - ($scale * $x - $newwidth) / 2;
        $newY = 0;
    }

    // new image
    $dest = imagecreatetruecolor($newwidth, $newheight);

    // now use imagecopyresampled
    imagecopyresampled($dest, $src, $newX, $newY, 0, 0, $scale * $x, $scale * $y, $x, $y);
    return $dest;
}

Update: Corrected the function. It is now working perfectly, I have tested it on my dev machine.