X y 点 逆时针旋转b角到c d 如下
c= xcos(β)-ysin(β)
d= ycos(β)+xsin(β)
顺时针也即坐标轴逆时针
s = os = oa + as = x cos(theta) + y sin(theta)
t = ot = ay – ab = y cos(theta) – x sin(theta)
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X y 点 逆时针旋转b角到c d 如下
c= xcos(β)-ysin(β)
d= ycos(β)+xsin(β)
顺时针也即坐标轴逆时针
s = os = oa + as = x cos(theta) + y sin(theta)
t = ot = ay – ab = y cos(theta) – x sin(theta)
相关文章：