Can not get the proper angle value

Hello,
I have drawed a circle on the canvas control, and want to capture an arbitrary point in the circle, where the point's coordinate is determined by the "GetRelativeMouseState()" function. The whole idea is this: once click in the circle, I can get the coordinate of the clicking point by using "GetRelativeMouseState()", then drawing a line from the circle's midpoint to the point, expecting to calculate the angle between the line and the X axis. I post the sketch to explain how the process is treated :
the coordinate of the midpoint is (width/2, height/2), so if want to calculate the theta angle, I can get the formular: theta = atan((height/2 - yCoor) / (width/2 - xCoor)), there is a strange condition: if the line is near to the X axis (in fact, the line turn to angle exceed 135 degree (as to the counterclockwise) but there is a distinct angle between the X axis, the theta), I always get a zero angle value(the theta).
Please help whether the "GetRelativeMouseState()" can provide an exact position?
David

How are you calculating the angles? With some basic trigonometry and atan2 () function I always get the correct angles: take a look at the attached canvas.prj sample which I modified adding the necessary functions (click Draw Circle and check Angle drawing: when clicking on the canvas the program will draw the line and calculate the corresponding angle)
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?
Attachments:
canvas.zip ‏10 KB

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