get point on circle returns vector

pgfw/Vector.py

@@ -1,7 +1,5 @@
 from math import pi, degrees
 
-from .extension import get_delta, get_distance, get_angle
-
 class Vector(list):
 
     def __init__(self, x=0, y=0):
@@ -111,6 +109,7 @@ class EVector(Vector):
     def set_step(self, dx=0, dy=0, magnitude=None, angle=0):
         """specify angle in radians, counter-clockwise, 0 is up"""
         if magnitude is not None:
+            from .extension import get_delta
             self.magnitude = magnitude
             self.angle = angle
             self.dx, self.dy = get_delta(angle, magnitude, False)
@@ -121,6 +120,7 @@ class EVector(Vector):
                 self.magnitude = 0
                 self.angle = 0
             else:
+                from .extension import get_angle, get_distance
                 end = self.x + dx, self.y + dy
                 self.magnitude = get_distance(self, end)
                 self.angle = -get_angle(self, end) - pi
@@ -135,6 +135,7 @@ class EVector(Vector):
     def __setattr__(self, name, value):
         list.__setattr__(self, name, value)
         if name == "magnitude" and self.angle is not None:
+            from .extension import get_delta
             self.dx, self.dy = get_delta(self.angle, value, False)
 
     def move(self):

pgfw/extension.py

@@ -5,6 +5,8 @@ from pygame import Surface, PixelArray, Color, Rect
 from pygame.mixer import get_num_channels, Channel
 from pygame.locals import *
 
+from .Vector import Vector
+
 def get_step(start, end, speed):
     x0, y0 = start
     x1, y1 = end
@@ -73,7 +75,8 @@ def get_points_on_circle(center, radius, count, offset=0):
 def get_point_on_circle(center, radius, angle, translate_angle=True):
     if translate_angle:
         angle = radians(angle)
-    return center[0] + sin(angle) * radius, center[1] - cos(angle) * radius
+    return Vector(center[0] + sin(angle) * radius,
+                  center[1] - cos(angle) * radius)
 
 def get_range_steps(start, end, count):
     for ii in range(count):