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line function help plz!

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ok lets say i have a region 256x256, and in this region i place two points, lemme define ''em..
L1.x = 15;
L1.y = 20;

L2.x = 190;
L2.y = 165;
i wanna make a function that will draw a line made of points from L1 to L2. yes i could use just a line drawing function, but i need to do it made of individual points. meaning, i want to make a function that runs from L1 to L2 and places a pixel every step of the way, creating the entire line. how do i do it? what equation would i use inside the loop to figure out what the next X,Y is each step? thx for help!

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