Appraise the development of input devices and modes used in computer graphics system. You should conduct some simple research and discuss each of these developments including purpose, advantages and disadvantages.

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

Question 1

 

Appraise the development of input devices and modes used in computer graphics system. You should conduct some simple research and discuss each of these developments including purpose, advantages and disadvantages.

 

• Physical and Logical input devices

(10 marks)

 

• Input modes: request mode, sample mode and event mode.

(10 marks)

 

Note: Marks will be awarded for originality and quality of research. Lifting of text from books and websites will not gain good marks.

 

 

Question 2

 

Employ the elements of computer graphics in 2D applications.

 

Consider the “branching rule” that is applied to a tree fractal. A single line segment branches into two sub-line segments resulting in Y-shaped tree. Each of these sub-line segments branches further to form smaller Y-shaped trees.

 

Note: The course textbook introduces us to a sample OpenGL program that draws the 2D Sierpinski gasket. You may use the same technique to create your tree fractal.

 

• Write an OpenGL program that draws three lines as shown in Figure Q2(a).

 

Figure Q2(a): Initial Three lines

(5 marks)

 

• Modify your program to apply the branching rule once on each of the three lines as shown in Figure Q2(b).

 

Figure Q2(b): Apply the branching rule once

(20 marks)

 

• Using recursion or otherwise, modify your program to iteratively apply the branching rule. The final object is three threes each with sub branches. Figure Q2(c) shows the output when the branching rule is applied 2, 3 and 4 times

Figure Q2(c): Apply the branching rule 2, 3 and 4 times respectively

(15 marks)

 

Question 3

 

Assemble an OpenGL/GLUT application that does the following:

 

• Using OpenGL, create a resizeable window that allows resizing using a

(6 marks)

 

• Implement display function to draw the following 3D objects. Illustrate the objects in white on a black background. The object should be drawn in a size relative to the window. For example, if the window is made smaller, the objects should be drawn smaller and vice

 

• Pyramid

(12 marks)

 

• Cube

(12 marks)

 

 

• Develop the following keyboard control:
• Press Escape key to exit the application
• Press ‘c’ key to display the Cube and not the Pyramid
• Press ‘p’ key to display the Pyramid and not the Cube
• Press ‘s’ key to display both the Cube and the Pyramid

(10 marks)

 

Further Notes for Question 3

1. Please make sure your code must compile and run, on the suggested platform in
2. Zip your project files including .cpp and .h if
3. Remember to provide comments to your
4. Embed your zip file in your TMA Answer

 

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