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def cross_point(x11, y11, x12, y12, x21, y21, x22, y22):  # находим точку
    if x12 != x11 and y11 != y12 and x22 != x21 and  y21 != y22:
        a1 = 1 / (x12 - x11)
        b1 = 1 / (y11 - y12)
        a2 = 1 / (x22 - x21)
        b2 = 1 / (y21 - y22)
        c1 = x11 / (x12 - x11) - y11 / (y12 - y11)
        c2 = x21 / (x22 - x21) - y21 / (y22 - y21)
        delta = a1 * b2 - a2 * b1
        delta_x = c1 * b2 - c2 * b1
        delta_y = a1 * c2 - a2 * c1
        x = delta_x / delta
        y = delta_y / delta
    else:
        if x12 == x11:
            x=x12
	if y12 == y11:
            y=y12
	if x22 == x21:
            x=x12
	if y21 == y22:
            y=y12
    return [x,y]