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Index › Programming Questions & Help › Programs › Local to World Coordinate Translating
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Local to World Coordinate Translating (Read 358 times)
dmly
Local to World Coordinate Translating
Aug 11th, 2008, 5:53pm  
Hi all,
I'm coding a wandering behavior as described in Matt Buckland AI Game Programming.
I got stuck at this part: translating the local coordinate of the wandering circle to the world (screen/global) coordinate.
For example: if I create a point in my circle by

// Theta is a random radian value
float x = random(-1,1) * Math.cos(theta);
float y = random(1-,1) * math.sin(theta);

My vehicle position has a coordinate of vX and vY.
How do I translate the x and y from relative to vX and vY to the world coordinate? I hope I phrase the question clear enough.

Thank you experts.
regards,
Doug
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RickiG
Re: Local to World Coordinate Translating
Reply #1 - Aug 14th, 2008, 12:50am  
I don't know the book or example, but I think I understand the question Smiley

In many other languages you would take the size of you map(width and height)  and divide this by the size of the world to get some a scaling factor to multiply with all your x, y, coordinates.

In processing the map function takes care of that for you:

http://processing.org/reference/map_.html

Hope that helps out in your case.

Ricki
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Regards Ricki
 
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