Liang Barsky Line Clipping - Computer Graphics Questions and Answers

This set of Computer Graphics Multiple Choice Questions & Answers (MCQs) focuses on “Liang-Barsky Line Clipping”.

1. Liang–Barsky algorithm is a __________ clipping algorithm.
a) circle
b) text
c) line
d) pixel
View Answer

Answer: c
Explanation: Liang–Barsky algorithm is a line clipping algorithm. The Liang–Barsky algorithm uses the parametric equation of a line for clipping operations.

2. The ideas of the Liang-Barsky algorithm are the same with which algorithm?
a) Cyrus Beck algorithm
b) Liam-Chopsky algorithm
c) Cohen Sutherland algorithm
d) All have the same
View Answer

Answer: a
Explanation: The ideas for clipping line of Liang-Barsky and Cyrus-Beck are the same. The only difference is Liang-Barsky algorithm has been optimized for an upright rectangular clip window.

3. Liang Barsky algorithm can be used to clip 3-D lines.
a) True
b) False
View Answer

Answer: a
Explanation: Liang Barsky algorithm can be used for 1-D lines, 2-D lines, and 3-D line clipping. This algorithm can be used for line clipping of 4-D lines too.

4. This algorithm uses the ____________ equations for a line and solves four inequalities.
a) linear
b) quadratic
c) cubic
d) parametric
View Answer

Answer: d
Explanation: This algorithm uses the parametric equations for a line and solves four inequalities to find the range of the parameter for which the line is in the viewport.

5. The Liang-Barsky algorithm is more efficient than the Cohen Sutherland algorithm.
a) True
b) False
View Answer

Answer: a
Explanation: Liang–Barsky clipping algorithm does as much testing as possible before computing line intersections, hence it is much more efficient than others.

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6. When the line is parallel to the boundaries then what is the value of p_k?
a) p_k < 0
b) p_k > 0
c) p_k = 0
d) p_k = 1
View Answer

Answer: c
Explanation: When pk < 0 line starts exceeding the boundary while if p_k > 0 line is bounded inside the boundary. When the line is parallel then p_k = 0.

7. Which type of arithmetic is used in Liang Barsky algorithm?
a) simple arithmetic operations
b) floating point arithmetic
c) fixed point arithmetic
d) logarithmic operations
View Answer

Answer:b
Explanation: Liang and Barsky have created an algorithm that uses floating-point arithmetic but finds the appropriate endpoints with at most four computations with use of parametric equations.

8. When pk < 0, then the line is ___________
a) parallel to the boundaries
b) exceeding the boundaries
c) bounded inside the boundaries
d) can’t say
View Answer

Answer: b
Explanation: When p_k < 0 line starts exceeding the boundary while if p_k > 0 line is bounded inside the boundary. When the line is parallel then p_k = 0.

9. How many inequalities are solved in this algorithm?
a) 3
b) 2
c) 1
d) 4
View Answer

Answer: d
Explanation: Liang-Barsky line clipping algorithm solves 4 inequalities to find the range of the parameter for which the line is in the intersection with the rectangle.

10. What is the relative speed improvement over Cohen-Sutherland algorithm for 2-D lines?
a) 40%
b) 50%
c) 70%
d) 36%
View Answer

Answer: d
Explanation: The relative speed improvement over Sutherland-Cohen algorithm are: – 36% for 2D lines, 40% for 3D lines, 70% for 4D lines.

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