"""
Geometric utilities

Medical Images 2021- MUEI/MNUR ETSEIB
"""


def window_viewport_transform(window, width, height):
    """
    Returns a tuple (sx, sy, tx, ty) that represents the geometric transformation of rasterization
    """
    sx = width / window.width
    sy = -height / window.height
    tx = -sx * window.xmin
    ty = height - sy * window.ymin
    return (sx, sy, tx, ty)