New feature: writing at an angle!

After Dr. Proctor's comment in the chat I realized my code wouldn't work
if you were trying to write at an angle so I added a rotation to the
transform. Surprisingly easy fix.

typeface.py

@@ -9,7 +9,8 @@
 # move the turtle along the diagonal of a square with side length x, 
 # the turtle should move a distance of sqrt(x)
 
-from turtle import (pos, teleport, goto)
+from turtle import (pos, teleport, goto, heading, setheading)
+from math import sin, cos, radians
 
 class Point(tuple):
     "Class for doing element-wise arithmetic on tuples"
@@ -25,6 +26,11 @@ class Point(tuple):
     def __truediv__(self, other):
         return Point((x / other for x in self))
     
+def rotate_2d_degrees(point, angle):
+    x, y = point
+    angle = radians(angle)
+    return Point((x * cos(angle) - y * sin(angle), x * sin(angle) + y * cos(angle)))
+    
 def bezier(t, *points: tuple[float, ...]) -> Point:
     "Recursive definition of a Bezier curve"
     assert(len(points) > 0)
@@ -36,7 +42,8 @@ def draw_bezier(unit, segments, *points: tuple[float, ...]):
     "Draws bezier and returns turtle to initial position"
     segments = int(unit * (segments / 40)) 
     origin = pos()
-    points = tuple(origin + unit * Point(x) for x in points)
+    angle = heading()
+    points = tuple(origin + rotate_2d_degrees(unit * Point(x), angle) for x in points)
     
     teleport(*points[0])
     for i in range(0, segments + 1):