Let P1 (1, 2), P2 (2, 4) XL = 0, XR = 1, YB = 0, YT = 1 dx = 2  (1) = 3 dy = 4  (2) = 6 P1 = dx = 3 q1 = x1  XL = 1  0 = 1 q1 / P1 = 1/3 P2 = dx = 3 q2 = XR  x1 = 1  (1) = 2 q2 / P2 = 2/3 P3 = dy = 6 q3 = y1  YR = 2 q3 / P3 = 1/3 P4 = dy = 6 q4 = YT  y1 = 3 q4 / P4 = 1/2 for (Pi < 0) t1="MAX" ( 1 / 3, 1 / 3, 0 )="1" / 3 for (Pi > 0) t2 = MIN ( 2 / 3, 1 / 2, 1 ) = 1 / 2 Since t1 < t2 there is a visible section 

compute new endpoints t1 = 1 / 3 x1' = x1 + dx . t1 = 1 + (3 . 1 / 3) = 0 y1' = y1 + dy . t1 = 2 + (6 . 1 / 3) = 0 t2 = 1 / 2 x2' = x1 + dx . t2 = 1 + (3 . 1 / 2) = 1 / 2 y2' = y1 + dy . t2 = 1 + (6 . 1 / 2) = 1 
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