Missing pvector.dist

src/pycreative/app.py

@@ -277,6 +277,13 @@ def dot(a, b):
                     bx, by = (b.x, b.y) if isinstance(b, PVector) else (float(b[0]), float(b[1]))
                     return ax * bx + ay * by
 
+                @staticmethod
+                def dist(a, b):
+                    """Euclidean distance between two PVectors or 2-length iterables."""
+                    ax, ay = (a.x, a.y) if isinstance(a, PVector) else (float(a[0]), float(a[1]))
+                    bx, by = (b.x, b.y) if isinstance(b, PVector) else (float(b[0]), float(b[1]))
+                    return math.hypot(ax - bx, ay - by)
+
                 @staticmethod
                 def angle_between(a, b):
                     ax, ay = (a.x, a.y) if isinstance(a, PVector) else (float(a[0]), float(a[1]))

tests/test_pvector_dist.py

@@ -0,0 +1,21 @@
+def test_pvector_dist_instance_and_classstyle():
+    from pycreative.vector import PVector
+    import math
+
+    v1 = PVector(10, 20)
+    v2 = PVector(60, 80)
+
+    # expected distance between (10,20) and (60,80)
+    expected = math.hypot(50, 60)
+
+    # instance method
+    d1 = v1.dist(v2)
+    assert abs(d1 - expected) < 1e-9
+
+    # class-style/unbound call (PVector.dist(v1, v2)) should work too
+    d2 = PVector.dist(v1, v2)
+    assert abs(d2 - expected) < 1e-9
+
+    # iterable input
+    d3 = v1.dist((60, 80))
+    assert abs(d3 - expected) < 1e-9