bresenham's algorithm line drawing
how bresenham's algorithm for line drawing working?

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Posted on: 20/05/2012
Bresenham's algorithm works with the use of a decision parameter. In the case of positive slope, X value will increase at unit interval of time. And if decision parameter is less than zero then Y value will take previous Y value, otherwise Y value is Y+1.

If P is the decision parameter then initial decision parameter Po is calculated by 2dy-dx, where dx = x2-x1 and  dy=y2- y1,
where the end points of required line is (x1,y1) and (x2,y2).

If P<0 then next P+1 value is calculated by P +2dy

If p>=0 then next P+1 value is calculated by P+2dy-2dx
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