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Updated function arc() to be simpler #89

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Updated function arc() to be simpler #89

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18 changes: 7 additions & 11 deletions code/polygon.py
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Original file line number Diff line number Diff line change
Expand Up @@ -56,17 +56,13 @@ def arc(t, r, angle):
r: radius
angle: angle subtended by the arc, in degrees
"""
arc_length = 2 * math.pi * r * abs(angle) / 360
n = int(arc_length / 4) + 3
step_length = arc_length / n
step_angle = float(angle) / n

# making a slight left turn before starting reduces
# the error caused by the linear approximation of the arc
t.lt(step_angle/2)
polyline(t, n, step_length, step_angle)
t.rt(step_angle/2)

resolution = 69
total_circumference = 2 * math.pi * r #circumference of a circle with same radius as the arc
segment_length = total_circumference/ resolution
LT_angle = 360/resolution
ratio = angle/360 #ratio that the arc is of a circle with the same radius as the arc
resolution = int(resolution * ratio)
polyline(t, resolution, segment_length, LT_angle)

def circle(t, r):
"""Draws a circle with the given radius.
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