def getSquareSegmentDistance(p, p1, p2):
    """
    Square distance between point and a segment
    """
    x = p1['x']
    y = p1['y']
    dx = p2['x'] - x
    dy = p2['y'] - y
    if dx != 0 or dy != 0:
        t = ((p['x'] - x) * dx + (p['y'] - y) * dy) / (dx * dx + dy * dy)
        if t > 1:
            x = p2['x']
            y = p2['y']
        elif t > 0:
            x += dx * t
            y += dy * t
    dx = p['x'] - x
    dy = p['y'] - y
    return dx * dx + dy * dy
