h = Sqrt( (start.x - end.x)^2 + (start.y - end.y)^2)
or
h = Math.Hypot(start.x - end.x, start.y - end.y)
R = Abs(h / (2*Sin(Angle/2)))
if angle <= Pi/2
top = end.y
left = end.x
bottom = start.y
right = start.x
else if angle <= Pi
top = start.y - R
left = end.x
bottom = start.y
right = start.x
else if angle <= 3*Pi/2
top = start.y - R
left = start.x - 2*R
bottom = end.y
right = start.x
else
top = start.y - R
left = start.x - 2*R
bottom = start.y + R
right = start.x
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