[RESOLVED] Calculate point on cirlce

[madsun]

Well..everything outside sounds nice But if that doesnt work, lets say the radius is 500 . The lines starts at circle.height / 2..Height of the circle equals the diameter (1000)

The angle of the lines..well..now its just 1/4 and 3/4 from the top..dunno the angle

[opus]

sounds like you only know the end point of the red lines (Y-Value is 1/4 or 3/4 of the circles diameter and I guess the end value for the X-value is in both cases 0.)
If the red lines shall end at the circle, the X-value can't be 0.


Try it with some trigonometry.
for the top line you have: Start point at (Diameter, Diameter/2) end point at (0, Diameter/4). The difference in Y-Value is Diameter/4, this value is 2*tan (Angle between Line and horizontal diameter of circle).

Having got this angle, you can calculate the sinus and cosinus to compute the corrrect values for the end points.