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x=Xr+(x1-Xr)cosa-(y1-Yr)sina
y=Yr+(x1-Xr)sina+(y1-Yr)cosa
(顺æ¶éæ转ï¼æaåæ-aå³å¯)
å³ä¸ºï¼
x=Xr+(x1-Xr)cosa+(y1-Yr)sina
y=Yr-(x1-Xr)sina+(y1-Yr)cosa
ã解æãå©ç¨å¤æ°
设A(x1ï¼y1)ï¼P(Xrï¼Yr)ï¼
æ转åçç¹ä¸ºM(xï¼y)
åéPA=(x1-Xr)+i(y1-Yr)
åéPM=åéPA·(cosa+isina)
=[(x1-Xr)+i(y1-Yr)]·(cosa+isina)
=[(x1-Xr)cosa-(y1-Yr)sina]+i[(x1-Xr)sina
+(y1-Yr)cosa]
âµåéPM=(x-Xr)+i(y-Yr)
â´Mçåæ 为
x=Xr+(x1-Xr)cosa-(y1-Yr)sina
y=Yr+(x1-Xr)sina+(y1-Yr)cosa
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