C语言编程 “画圆” 源程序

initgraph(&driver,&mode,&uot;&uot;);

setcolor(15);

line(66,66,88,88);

lineto(100,100);

linerel(36,64);

getch();

restorecrtmode();

}

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#include <math.h>

#include <graphics.h> /*预定义库函数*/

void circlePoint(int x,int y) /*八分法画圆程序*/

{

circle(320 x*20,240 y*20,3);

circle(320 y*20,240 x*20,3);

circle(320-y*20,240 x*20,3);

circle(320-x*20,240 y*20,3);

circle(320-x*20,240 y*20,3);

circle(320-x*20,240-y*20,3);

circle(320-y*20,240-x*20,3);

circle(320 y*20,240-x*20,3);

circle(320 x*20,240-y*20,3);

}

void MidBresenhamcircle(int r) /* 中点Bresenham算法画圆的程序 */

{

int x,y,d;

x=0;y=r;d=1-r; /* 计算初始值 */

while(x<y)

{ circlePoint(x,y); /* 绘制点(x,y)及其在八分圆中的另外7个对称点 */