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¤½¦¡¨S¿ù¡AC ÂI®y¼Ð¬° (1+¡Ô2,1+¡Ô2)¡C
»¡©ú¦p¤U¡G
³] A(x1,y1), B(x2,y2) ¬°¥±¤W¨âÂI¡A
«h½u¬q AB ªº°Ñ¼Æ¦¡¬°¡G
ùú x = x1 + (x2-x1)t
¢x
ùü y = y1 + (y2-y1)t¡A0¡Øt¡Ø1¡C
ª`·N¤W¦¡¦b t = 0 »P t = 1 ®É¤À§Oªí¥Ü A ÂI»P B ÂI¡C
½u¬q AB ¤W¤@ÂI C¡AY A, C ¶ZÂ÷¬°¤wª¾¡A
¥i¥Ñ½u©Ê¤ñ¨Ò |AC| : |AB| = t : 1
¨D¥X C ¬Û¹ïÀ³ªº°Ñ¼ÆÈ t = |AC|/|AB|¡A
©Ò¥H C ÂI®y¼Ð (X,Y) ¬°
X = x1 + |AC|(x2-x1)/|AB| = x1 + |AC|cos(£c)¡A
Y = y1 + |AC|(y2-y1)/|AB| = y1 + |AC|sin(£c)¡A
¨ä¤¤£c¬°ª½½u AB »P X ¶bªº§¨¨¤¡C