Processing 1.0 - Processing Discourse - finding right edge of an angled image

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Index › Programming Questions & Help › Syntax Questions › finding right edge of an angled image

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finding right edge of an angled image (Read 476 times)

Linda

finding right edge of an angled image
Sep 30^th, 2007, 3:33am

Hi
I am having trouble tracking the right hand edge of an image.
I am making many pictures of arrows fly across the screen and want to find when they hit the right hand edge so I can make them stop. Each image is given a random rotation.

http://www.dement.org/moving_forest/problem/arrows10.html

I am using the calculation
cos(angleInRadians) x widthOfImage
to find the actual width now that the image is rotated. I add that to the current x position to find the current right edge.

I am not getting the right numbers at all and can't work out why not. If you run this you'll see that the arrows angled down fall short of the edge and the arrows angled up go too far.

Any help would be much appreciated.

thanks
trigonometrically challenged
Linda

antiplastik

Re: finding right edge of an angled image
Reply #1 - Oct 1^st, 2007, 3:48pm

Hi Linda,

When you draw a picture using image(PImage, x, y), the upper-right corner of your picture is at (x, 0).

Your right-edge formula is correct but according to this statement, it gives you the x-position of the upper-right corner of your picture.

Maybe you should try to draw your arrows vertically-centered to solve your problem.

Nicolas.

Linda YaBB Newbies Offline Posts: 3	Re: finding right edge of an angled image Reply #2 - Oct 2^nd, 2007, 3:09am Thanks Nicholas I'll give that a try. Linda

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