reverting get angle to counterclockwise, x/y swapped version

pgfw/Vector.py

@@ -128,8 +128,8 @@ class EVector(Vector):
             else:
                 from .extension import get_angle, get_distance
                 end = self.x + dx, self.y + dy
+                self.angle = get_angle(self, end, True)
                 self.magnitude = get_distance(self, end)
-                self.angle = -get_angle(self, end) - pi
 
     def __repr__(self):
         return "<dx=%.2f, dy=%.2f, m=%.2f, ang=%.2f>" % \

pgfw/extension.py

@@ -35,7 +35,8 @@ def get_points_on_line(start, end, count):
     return points
 
 def get_angle(start, end, transpose=False):
-    angle = atan2(end[1] - start[1], end[0] - start[0])
+    """counterclockwise, 0 is down"""
+    angle = atan2(end[0] - start[0], end[1] - start[1])
     if transpose:
         angle = -angle - pi
     return angle