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Computer Graphics

3. Select the suitable choice for every question:
(a) A 9 sided polygon is known as:
(i) Dodecagon (ii) Nonagon
(iii) Undecagon (iv) Decagon

(b) Parity scan conversion algorithm is used to scan convert which among the following?
(i) Arc (ii)Ellipse
(iii) Polygon (iv) Line
(c) A glyph with a certain number of points displayed within an imaginary circle is known as:
(i) One-Dimensional Glyph (ii) Two-Dimensional Glyph
(iii) Star Glyph (iv) Polygonal Glyph
5.8 Review Questions

1. “Two important properties are required to scan convert polygons.” List and briefly explain the
properties.
2. “A glyph can be a numeric, alphabetic font or some other symbol that pictures an encoded
character.” Briefly discuss the difference between a glyph and a character.
3. “Anti-aliasing is a method of deceiving the eye where a jagged edge is shown as a smooth end.”
Explain.
4. “Two algorithms are defined for filling an object.” List and discuss the two algorithms.
5. Briefly discuss the four major types of glyphs.
6. “Polygons are named based on the number of sides it has.” Discuss with examples.
7. Explain the process of aliasing.
Answers: Self Assessment

1. (a) False (b) False (c) True
2. (a ) Aliasing (b) Flood-Fill Algorithm (c) Glyph (d) Anti-Aliasing
3. (a) Nonagon (b) Polygon (c) Star Glyph
5.9 Further Readings

K. Malay, Pakhira , Computer Graphics, 2 Ed.
nd
N.S.Amarendra, D.U.Arun, Computer Graphics, The McGraw-Hill Companies

http://whatis.techtarget.com/definition/0,,sid9_gci212200,00.html
http://www.tutornext.com/perimeter-polygons/909

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