UGC NET CSE | June 2016 | Part 3 | Question: 15

Question

Let R be the rectangular window against which the lines are to be clipped using 2D Sutherland-Cohen line clipping algorithm. The rectangular window has lower rectangular corner at (-5, 1) and upper right-hand corner at (3, 7). Consider the following three lines for clipping with the given end-point coordinates?

Line AB:A(-6,2) and B(-1,8)

Line CD: C(-1,5) and D(4,8)

Line EF: E(-2,3) and F(1,2)

Which of the following lines is/are candidate for clipping?

• A. AB
• B. DC
• C. EF
• D. AB and CD

Answer 1

ans is D  (geometrical method simple and efficient)

 

since EF is completely inside window hence it is trivialy visible and dont need clipping

for  cohen sutherland algo (which is lengthy but  accurate  method ) refer https://www.cs.helsinki.fi/group/goa/viewing/leikkaus/lineClip.html