rotation & reflection rules

• rx-axis - (x,-y)
• ry-axis - (-x,y)
• r origin - (-x,-y)
• ry=x - (y,x)
• ry=-x - (-y,-x)
• R90/R-270 - (-y,x)
• R180 - (-x,-y)
• R270/R-90 - (y, -x)