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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SEVENTH SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2018
Course Code: CS401
Course Name: COMPUTER GRAPHICS

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries 4 marks. Marks
1 What do you understand by the aspect ratio and resolution of a display (4)
screen in a raster scan display?
2 Write the flood fill algorithm for filling a polygon. (4)
3 Write the methods used to plot a dashed line segment. (4)
+ Given a triangle A(20,10) B(80,20) C(50,70). Find the co-ordinates of (4)

vertices after each of the following transformation.
(a) Reflection about the line x=y.
(b) Rotation of the triangle ABC about vertex A in clockwise direction
for an angle 90 degree.

© Write the different tables used for representing polygon surfaces. Illustrate (4)
with an example.

6 Describe the techniques that can be used to provide text clipping in a (4)
graphics package.
Explain about different types of parallel projections. (4)

8 What do you understand by correlation and convolution operations in case of (4)
image processing?

9 Write the Z-buffer algorithm for hidden surface removal. (4)

10 What do you understand by the following terms with respet to pixels. (4)

Neighbours, Adjacency, Connectivity.

PART B
Answer any two full questions, each carries 9 marks.
11 ௨ Explain the working of a random scan display system with suitable diagram. (6)
b) Explain the working of a beam penetration CRT. (3)
12 a) Write the midpoint circle drawing algorithm. (4)

b) Use midpoint circle drawing algorithm to plot a circle whose radius =20 (5)
units and center is (50, 30).
13 a) Amouse is picked up and placed in another position. Whether the position of (2)
the mouse pointer change. Justify your answer.
b) Explain the working of a light pen. (3)
c) Write the scan line algorithm for filling a polygon. (4)

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