Question

The polygons are scaled by applying the following transformation.

(a) X’=x * Sx + Xf(1-Sx) and Y’=y * Sy + Yf(1-Sy)

(b) X’=x * Sx + Xf(1+Sx) and Y’=y * Sy + Yf(1+Sy)

(c) X’=x * Sx + Xf(1-Sx) and Y’=y * Sy – Yf(1-Sy)

(d) X’=x * Sx * Xf(1-Sx) and Y’=y * Sy * Yf(1-Sy)

The question was asked in exam.

My question is from 2D Scaling topic in chapter 2D Transformation and Viewing of Computer Graphics

Answer 1

Correct choice is (a) X’=x * Sx + Xf(1-Sx) and Y’=y * Sy + Yf(1-Sy)

The explanation is: The polygons are scaled by applying the transformation X’=x * Sx + Xf(1-Sx) and Y’=y * Sy + Yf(1-Sy).