Computer Graphics

ORDINARY EXAMINATION FOR THE BACHELOR OF SCIENCE IN INFORMATION TECHNOLOGY/BACHELOR OF BUSINESS INFORMATION TECHNOLOGY

BIT2104/BBIT226: COMPUTER GRAPHICS

DATE: APRIL 2017                                                                               TIME: 2 HOURS

INSTRUCTIONS: Answer QUESTION ONE and any other TWO Questions.

QUESTION ONE (30 MARKS)

1. Define Computer Graphics.                                                                    (2 marks)
2. Describe how the Cathode Ray Tube works.                                                (4 marks)
3. Explain any five application areas of Computer Graphics.                     (5 marks)
4. Distinguish between Transformation and Translation in two dimensional graphics.                                                                                       (4 marks)
5. List the steps involved in 3D transformation. (2 marks)
6. Differentiate between intensity of light, brightness and hue.                  (3 marks)
7. Point out the difference between Additive color and Subtractive color system.                                                                                                                                           (2 marks)
8. Outline the two representation schemes used in three dimensional objects.

(4 marks)

QUESTION TWO (20 MARKS)

1. Write the different tricks used in computer graphics animation. (5 marks)
2. Explain the three types of text clipping methods available in graphics package.                                                                                                               (6 marks)
3. State five examples of computer graphics standards.                              (5 marks)

1. Point out two advantages and two disadvantages of the Digital Differential Analyzer (DDA) Algorithm.                                                                          (4 marks)

QUESTION THREE (20 MARKS)

1. Describe the curve clipping Algorithm.                                     (4 marks)
2. Explain the difference between a raster scan system from a random scan system.                                                                                           (6 marks)
3. Compare and contrast between the RGB and the CMY color models. (10 marks)

QUESTION FOUR (20 MARKS)

1. Digitize a line from (10,12) to (15,15) on a raster screen using Bresenham’s straight line algorithm.                                                                                 (10 marks)
2. Discuss the properties of B-spline Curves.                                                 (10 marks)