bezierBy
Draw a bezier curve using relative values. A bezier curve is defined by the start and end points A and B, as well as control points B and C (which the line does NOT pass through).
A = previous point
B = previousPoint + heading1
C = D - heading2
D = A + delta
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Parameters
heading1
The heading of the first control point from the previous point
heading2
The heading of the second control point from the end point
delta
The position of the end point relative to the previous point