Ok, i asked something like this a little while ago in the graphics theory forum, but didn''t really got an answer i could use. I have the start and end cordiantes of a line. ( xa, ya, xb, yb ) I need to clip it inside some limits without the line appears differently inside the limits. I hope you understand. (like clipping the line inside the screen and remove the outside because it isn''t going t be viewed.) If i also got the limit numbers ( from 0,0 to 640,480 ) can i then with a mathematical formula clip it into theese limits? In my case i can''t do it while drawing the actual line... Here is an overview of my problem: xa = X ya = Y xb = Z yb = W limitXa = 0 limitYa = 0 limitXb = 640 limitYb = 480 clippedlineXa = ? clippedlineYa = ? clippedlineXb = ? clippedlineYb = ? Please help...

Request the code at my email , basically its shuterland-cohen algo, it is very long to explain here, but it is based on integer math , no float and it is pretty fast , it is based also on bytecode testing for proper side clipping.

This forum''s FAQ links to an excellent explanation of the Cohen-Sutherland algorithm, which is indeed what you want:

http://www.cs.brown.edu/courses/cs123/lectures/Clipping.pdf

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