Re: Check Parallel lines if intersect
Get the vector of the line (marron/yellow) for this example the line has coords of ((1,2) (4,4))
v = (x2-x1), (y2-y1) = (3, 2))
v(perp) = (-2, 3) or (2, -3)
To create a line that starts an one of the points, say (1, 2) to get the end point add the v(perp) to the start point (1-2, 2+3) or (-1, 5). If you want a longer or shorter line ...