Data update

Task/Find-the-intersection-of-two-lines/Python/find-the-intersection-of-two-lines-4.py

@@ -0,0 +1,19 @@
+import pygame as pg
+
+def segment_intersection(a, b, c, d):
+    """ returns a pygame.Vector2 or None if there is no intersection """
+    ab, cd, ac = a - b, c - d, a - c
+    if not (denom:= ab.x * cd.y - ab.y * cd.x):
+        return
+
+    t = (ac.x * cd.y - ac.y * cd.x) / denom
+    u = -(ab.x * ac.y - ab.y * ac.x) / denom
+    if 0 <= t <= 1 and 0 <= u <= 1:
+        return a.lerp(b, t)
+
+
+if __name__ == '__main__':
+    a,b = pg.Vector2(4,0), pg.Vector2(6,10)  # try (4, 0), (6, 4)
+    c,d = pg.Vector2(0,3), pg.Vector2(10,7)  # for non intersecting test
+    pt = segment_intersection(a, b, c, d)
+    print(pt)