a rotation is a turn around around a point
90 counterclockwise or 270 clockwise
(x, y) --> (-y, x)
180 degrees
(x, y) --> (-x, -y)
90 clockwise or 270 counterclockwise
(x, y) --> (y, -x)
360 degrees --> nothing changes!
(one complete turn)
90 counterclockwise or 270 clockwise
(x, y) --> (-y, x)
180 degrees
(x, y) --> (-x, -y)
90 clockwise or 270 counterclockwise
(x, y) --> (y, -x)
360 degrees --> nothing changes!
(one complete turn)