(x,y) - (y,x)
across the line y=x
(x,y) - (-y,-x)
across the line y=-x
1/4
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(x,y) - (y,x)
across the line y=x
(x,y) - (-y,-x)
across the line y=-x
(x,y) - (y,-x)
90° clockwise
(x,y) - (-y,x)
90° counterclockwise
(x,y) - (-x,-y)
180°