Naive bresenham

gistfile1.pde

// simple line algorithm to draw / read along a line.
//
 
// assumes x1 < x2 and y1 < y2
int x1=10,x2=100;
int y1=20,y2=40;
 
// assumes xdiff > ydiff
float xdiff = x2-x1;
float ydiff = y2-y1;
float ystep = ydiff / xdiff;
 
for ( int i = 0; i < xdiff; i++ )
{
    float x = i + x1;
    float y = y1 + i * ystep;
    point( x, y );
}