二维旋转矩阵

坐标系旋转顶点不变 x’=x·cos(θ)+y·sin(θ) y’=y·cos(θ)-x·sin(θ) 顶点旋转坐标系不变 [x,y]R = (xcos(θ) - ysin(θ),xsin(θ) + ycos(θ)) 由于旋转坐标系相当于反向旋转物体。 xcos(θ) = -cos(θ) = xcos(θ) -ysin(θ) = ysin(θ) xsin(θ) = -xsin(θ) ycos(θ)

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