Page 58 - DCAP313_LAB_ON_COMPUTER_GRAPHICS

Lab on Computer Graphics

Notes 3.5 Keywords

Magnitude: Magnitude is the “size” of a mathematical object, a property by which the object
can be compared as larger as or smaller than other objects of the same kind.
Pen-plotter: The plotter is a computer printer for printing vector graphics. In the past, plotters
were used in applications such as computer-aided design, though they have generally been
replaced with wide-format conventional printers.

Pixels: A pixel (picture element) is a physical point in a raster image, or the smallest, addressable
element in display; so it is the smallest, controllable element of a picture represented on the screen.
Pseudo: A pseudo-event is an event or activity that exists for the sole purpose of the media
publicity and serves little to no other function in real life.
Quantization: Quantization is the procedure of constraining something from a relatively large
or continuous set of values (such as the real numbers) to a relatively small discrete set.
Translation: A translation moves all points of an object a fixed distance in a specified direction.
It can also be expressed in terms of two frames by expressing the coordinate system of object
in terms of translated frames.
3.6 Review Questions

1. What is the concept of implementing line algorithm?
2. Explain the types of implementing line algorithm.
3. Discuses the Bresenham’s Algorithm.

4. What is the DDA Line Algorithm?
5. Write a program in C code the DDA line algorithm.

6. Write a C program Bresenham’s Algorithm.
7. Explain the integer Bresenham’s algorithm.
8. Explain the all steps of line DDA algorithm.
9. Write advantages and disadvantages of DDA algorithm.

10. Explain the integer Bresenham’s algorithm for lines with arbitrary endpoints.
Answers for Self Assessment Questions

1. (a) 2. (b) 3. (c) 4. (d) 5. (b)
6. (a) 7. (a) 8. (a) 9. (c) 10. (c)
11. (a) 12. (a) 13. (b) 14. (a) 15. (b)

3.7 Further Readings

Introduction to computer graphics, by Krishnamurthy

Comprehensive Computer Graphics, by V.K. Pachghare

http://www.cglabprograms.com/2008/10/dda-line-drawing-algorithm.html

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