Rotating a Line w.r.t Origin and an Endpoint

Assignment 10
Rotating a given point in a anticlockwise direction about the origin in 2D.

(You can specify a point by the left mouse button, and click the right mouse button to rotate it).
Write a program to rotate any line through an angle (say 30^o) with respect to

the origin [Answer]
one of its end points [Answer]

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