Double Elbow
Control point C is the middle point of P2
and P3. Point M is the middle point of P1
and P2.
Since Start point P1, end point P2, and coordinates
X of control C are free points,
formulas are not necessary.
Coordinate Y of point C is apparently the
value that is subtracted
length of NC from coordinate Y of point
M,
as above figure shows.
For coordinates of points P2 and P3, please click here.
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