คุณสมบัติของโปรแกรม · กรอบพิกเซลแบบรักษาสัดส่วน

def fit_box(image_width, image_height, box_width, box_height):
    values = (image_width,image_height,box_width,box_height)
    if any(type(v) is not int or not 1 <= v <= 1000000 for v in values):
        raise ValueError("dimensions 1 through 1000000")
    if image_width*box_height > image_height*box_width:
        width, height = box_width, image_height*box_width//image_width
    else:
        width, height = image_width*box_height//image_height, box_height
    if not width or not height: raise ValueError("subpixel result")
    return (box_width-width)//2, (box_height-height)//2, width, height