Lets say I have a rectangle (height > width). I need to know the bottom middle point. That would be point(clipWidth / 2, clipHeight).
So we'll say: var x = clipWidth / 2; var y = clipHeight;
Closest I've gotten is using: x=ClipWidth / 2 + Math.cos(angle) y=ClipWidth / 2 - Math.sin(angle)
That's pretty close already -- it's what you would use to draw a circle (by iterating the angle and connecting the resulting dots). What you need is those two values: var cos = Math.cos( angle ); var sin = Math.sin( angle ); Then do the following with x and y from above (your "vector" for the "rotation matrix"): var rotX = cos * x - sin * y; var rotY = sin * x + cos * y; rotX and rotY are your coordinates (relative to the rectangle clip's position on its parent clip). One more thing: _rotation is stored as one byte, so it's rounded to 360 / 255. That's something you will have to take in account for the angle if you want to be exact, easiest would be to read the angle from the _rotation property after you've changed that. HTH, Mark On 10/4/06, Jason C Reynolds <[EMAIL PROTECTED]> wrote:
Hi, having some math problems... hoping someone can help.... Lets say I have a rectangle (height > width). I need to know the bottom middle point. That would be point(clipWidth / 2, clipHeight). But I am having a hard time keeping track of this point after I rotate that clip. If I rotate the clip 40 degrees (clip._rotation = -40), where on the stage is that bottom middle point now? I have searched the forums, and came up with alot of finding the angles, but all seem to assume I know 2 points. Closest I've gotten is using: x=ClipWidth / 2 + Math.cos(angle) y=ClipWidth / 2 - Math.sin(angle) Sorry, I'm soooo rusty with math and hoping someone can push me in the right direction. Right now I'm trying to figure out the radius of the 'circle' that is formed while rotating, but that isn't going anywhere (fast anway). Thanks for any tips, Jason _______________________________________________ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
_______________________________________________ Flashcoders@chattyfig.figleaf.com To change your subscription options or search the archive: http://chattyfig.figleaf.com/mailman/listinfo/flashcoders Brought to you by Fig Leaf Software Premier Authorized Adobe Consulting and Training http://www.figleaf.com http://training.figleaf.com
