337411(37)
B.E (Fourth Semester) Examination,
Apr.-May., 2008
(Mechanical Branch)
COMPUTER GRAPHICS
Time allowed : THREE Hours
Maximum Marks : 80
Minimum Pass Marks : 28
Note :- Part (a) from each question is compulsary. Solve any two parts from (b), (c) &(d) of each question.
1. (a) Enumerate any 4 application of Computer Graphics. 2
(b) Explain the contrucyion and working of a CKT. 7
(c) Write short notes on :
(i) Mouse
(ii) Light Pen
(iii) Touch sensitive screen
(d) State & explain in short various types of printers. 7
2. (a) Define Aspect ratio. 2
(b) Scan convert an octant of a circle using midpiont circular algorithm. Take origin as centre & radius of the circle as 10 units. 7
(c) Scan convert one ovarter of an ellipse passing through (0,6) & (8,0) with centre as origin using ellipse midpiont algorithm. 7
(d) Scan convert a straight line whose ends pionts are (5,10) and (15,35) using symmetric DDA for an aspect ratio of 1:1 . 7
3. (a) State any four types of image manipulations. 2
(b) Find the reflection of the piont (3,11) about a line : y = 3x + 4. 7
(c) Perform the following transformations on a triangle with vertices A (0,0), B (2,2), C(5,3) :
(i) move with mx = -10 & my = -2, then
(ii) twist with tx = -0.05, ty = 0.1 & then
(iii) scale with sx = 0.75 & sy =1
(d) Magnify the triangle with vertices A(0,0), B(2,2), C(5,3) to 1.5 times its size keeping B fixed in position.
4. (a) Define Clipping. 2
(b) Explain :
(i) world co-ordinate system
(ii) normalised screen co-ordinates
(iii) screen co-ordinates
(iv) device co-ordinates
(c) Clip the triangle ABC with co-ordinates (15, 7) , (30 , 7) , (30, 27) against the window with parameters W (10,25,5,15) using a midpoint clipping method. 7
(d) clip the polygon with vertices A (12 ,0) , B (22,0) , C (22,7) D (28,7) E (34,25) F (25,16), G (22,15) against a window W (10,30,5,20) by using when Sutheriand clipping algorithm.
5. (a) Write the general equation of Bezier curve. 2
(b) Draw a Bezier curve of the following control pionts :
(0,0) ,(4,3),(8,4) ,(12,0)
(c) Explain parellel and perspective projections & write 3D transformation matrix for translation & rotation. 7
(d) Determine the equation for a cubic spline segment passing through two end pionts A (0,5) & B (10,20) having a slope of 2 & curvature of -0.5 at A. Also find 5 pionts for this curve. 7
