Resize to fit within rectangle

[tibberous]

I want to resize an image to fit within a rectangle.

 

Lets say my rectangle is 400 wide and 200 tall.

 

My image is 300x300.

 

It should take, and make the rectangle 200 tall, then scale the width accordingly.

 

I wrote a function a while back that resizes inside a square, but that was a little easier, since you know to constrain by height if height is greater than width, and to constrain by width if width is greater than height.

 

	$w = $stats[0];
	$h = $stats[1];

	if($dim){ // constrain image
		if($w > $h){
			$h = ($h / $w) * $dim;
			$w = $dim;
		} else {
			$w = ($w / $h) * $dim;
			$h = $dim;
		}
	}

 

Thats my code to constrain inside a box. It gets the starting h and w from $stats, which is loaded from getimagesize. Then it sets a new h and w based on dim, which is the size of the box.

 

The new version will need dimW and dimH, instead of just dim.

 

Can anyone help me out?

[tibberous]

Got it:

 

$dimW = $dim[0];

$dimH = $dim[1];

 

if( ($w*$dimW) <= ($h*$dimH) ){

$h = ($h / $w) * $dimW;

$w = $dimW;

} else {

$w = ($w / $h) * $dimH;

$h = $dimH;

}

 

Trick with shit like this is to draw out the problem and know what your final values are going to be.