Question 6847 – Computer-Graphics

The Liang-Barsky line clipping algorithm uses the parametric equation of a line from (x₁, y₁) to (x₂, y₂) along with its infinite extension which is given as :
x = x₁ + ∆x.u
y = y₁ + ∆y.u
Where ∆x = x₂– x₁, ∆y = y₂– y₁, and u is the parameter with 0 ≤ u ≤ 1. A line AB with endpoints A(–1, 7) and B(11, 1) is to be clipped against a rectangular window with x_min = 1, x_max = 9, y_min = 2, and y_max = 8.
The lower and upper bound values of the parameter u for the clipped line using Liang-Barsky algorithm is given as :

Correct Answer: B