Finding points on rectangle

Question

I am trying to find the coordinate of Z1 where the curve line intersect the rectangle. Given that I have the coordinate of center rectangle, center of the circle and circle circumference.

I have find this website but I don't have the angle Finding points on a rectangle at a given angle

That depends entirely on what kind of "curve line" this is. It it some sort of Bezier spline? You will have to know more parameters then (and even if you know them, doing this analytically may be *really* hard...) — Marco13, Aug 02 '16 at 01:44
It is a Quadratic Bezier curve. That mean I also have the control point that I also know. — Zheng Xian, Aug 02 '16 at 01:50
Set the equations of the lines equal to each other and see if they intersect within their bounds. — Ignacio Vazquez-Abrams, Aug 02 '16 at 02:02

score 0 · Answer 1 · edited May 23 '17 at 11:44

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Just look at the code on this site, for the intersection of a Q-bezier and a line segment: calculating intersection point of quadratic bezier curve. Then just apply this check to all 4 sides of the rectangle.

edited May 23 '17 at 11:44

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answered Aug 02 '16 at 08:47

Finding points on rectangle

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