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#include
{ putpixel(200+x,200+y,RED) ; putpixel(200+y,200+x, RED) ; putpixel(200-y,200+x, RED);putpixel(200-x,200+y, RED); putpixel(200-x,200-y, RED);putpixel(200-y,200-x, RED); putpixel(200+y,200-x, RED);putpixel(200+x,200-y, RED); }
void MidBresenhamcircle(int r) { int x,y,d;
x=0;y=r;d=1-r; while(x { circlePoint(x,y); if(d<0) d+=2*x+3; else{ d+=2*(x-y)+5;y--;} x++; } } void main() 2008-12-24 µÚ Ò³¹² 7 Ò³ ¹þ¶û±õÀí¹¤´óѧ 2008£2009ѧÄêµÚ Ò» ѧÆÚ¿¼ÊÔÊÔÌâ A¾í´ð°¸ { int gdriver,gmode; detectgraph(&gdriver,&gmode); initgraph(&gdriver,&gmode,\ MidBresenhamcircle(100); getch(); closegraph(); } Èý¡¢¼ò´ðÌ⣨¹²3СÌ⣬ÿСÌâ5·Ö£¬×ܼÆ15·Ö£¬ÇëÖ±½ÓÔÚÔÌâÉÏ×÷´ð£© 1¡¢×ßÑùÓë·´×ßÑùµÄ¶¨ÒåÊÇ£¿·´×ßÑù¼¼Êõ°üÀ¨ÄÇЩ£¿ ´ð£º×ßÑùÖ¸µÄÊÇÓÃÀëÉ¢Á¿±íʾÁ¬ÐøÁ¿ÒýÆðµÄÊ§Õæ¡£ ΪÁËÌá¸ßͼÐεÄÏÔʾÖÊÁ¿¡£ÐèÒª¼õÉÙ»òÏû³ýÒò×ßÑù´øÀ´µÄ½×ÌÝÐλòÉÁ˸Ч¹û£¬ÓÃÓÚ¼õÉÙ»òÏû³ýÕâÖÖЧ¹ûµÄ·½·¨³ÆÎª·´×ßÑù¡£ Æä·½·¨ÊÇ¢ÙǰÂ˲¨£¬ÒԽϸߵķֱæÂÊÏÔʾ¶ÔÏ󣻢ںóÂ˲¨£¬¼´¼ÓÈ¨ÇøÓòÈ¡Ñù£¬ÔÚ¸ßÓÚÏÔʾ·Ö±æÂʵĽϸ߷ֱæÂÊÏÂÓõãÈ¡Ñù·½·¨¼ÆË㣬Ȼºó¶Ô¼¸¸öÏñËØµÄÊôÐÔ½øÐÐÆ½¾ùµÃµ½½ÏµÍ·Ö±æÂÊϵÄÏñËØÊôÐÔ¡£ 2¡¢ÊÔÃèÊöÆë´Î×ø±êµÄ¶¨Òå¡¢ÓŵãÒÔ¼°ÈçºÎ½øÐйéÒ»»¯¡£ ´ð£ºËùνÆë´Î×ø±ê¾ÍÊÇÓÃn+1άÏòÁ¿±íʾnάÏòÁ¿£¬È磺µãp[x,y]µÄÆë´Î×ø±ê¿É±íʾ[hx,hy,h]£»Æë´Î×ø±êµÄÓŵãÊÇnά¿Õ¼äÖнÏÄѽâ¾öµÄÎÊÌ⣬±ä»»µ½n+1ά¿Õ¼äÖоͱȽÏÈÝÒ׵õ½½â¾ö£»±£Ö¤ÆäΩһÐԵİ취ÊǶ¨Ò广·¶»¯Æë´Î×ø±ê±íʾ£¬¹æ·¶»¯Æë´Î×ø±ê±íʾ¾ÍÊÇh=1µÄÆë´Î×ø±ê±íʾ¡£ 3¡¢BezierÇúÏßÔڶ˵㴦µÄÒ»½×µ¼ÊýΪ£ºp¡¯(0)=n(P1-P0)£¬p¡¯(1)=n(Pn-Pn-1)£¬¶þ½×µ¼ÊýΪ£ºp¡±(0)=n(n-1)((P2-P1)-(P1-P0))£¬p¡±(1)=n(n-1)((Pn-2-Pn-1)-(Pn-1-Pn))¡£Ð´³öÈçͼ2ËùʾµÄÁ½¶ÎÈý´ÎBezierÇúÏßÔÚÁ¬½Óµã´¦µÄG1£¬G2Á¬ÐøÐÔÌõ¼þ¡£ ͼ2 ´ð£ºÒòΪÊÇÈý´ÎBezierÇúÏߣ¬ËùÒÔÓÐn=3¡£ ¸ù¾ÝG1Á¬ÐøÐÔÌõ¼þÓУºp¡¯(1)=a* p¡¯(0)¼´£ºQ1-Q0= a*(P3-P2) ÓÖ¸ù¾ÝG2Á¬ÐøÐÔÌõ¼þÓУº p¡±(1)£½b*p¡±(0)¼´£ºQ0-2Q1+Q2=b*(P1-2P2£«P3) µç×ÓÐÅÏ¢¹¤³Ìϵ ³öÌâ½Ìʦ ÕÅ¿ªÓñ ϵ£¨²¿¡¢ÖÐÐÄ¡¢½ÌÑÐÊÒ£©Ö÷ÈΣº µÚ Ò³¹² 7 Ò³