Image Resize

function calcResize(op){
    var ratio = Math[(op.fill)?'max':'min'](op.to.width/op.from.width,op.to.height/op.from.height);
    var r = {
        width: Math.round(op.from.width * ratio),
        height: Math.round(op.from.height * ratio)
    }
    r.x = Math.round((op.to.width - r.width) / 2);
    r.y = Math.round((op.to.height - r.height) / 2);
    return r;
}

console.log(calcResize({
    from: {
        width: 240,
        height: 320
    },
    to: {
        width: 320,
        height: 240
    },
    fill: true
}));