中点Bresenham算法画圆的程序

文章类别：C语言程序设计 | 发表日期:2008-9-24 14:45:29

#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 */
     if(d<0)  d+=2*x+3;         /* 根据误差项d的判定,决定非最大位移方向上是走还是不走 */
       else
            { d+=2*(x-y)+5;
              y--;
             }
              x++;
     delay(900000);
     }  /* while */
}
main()
{
  int i,j,r,graphmode,graphdriver;
  detectgraph(&graphdriver,&graphmode);
  initgraph(&graphdriver,&graphmode," ");
    printf("中点Bresenhamcircle算法画圆的程序\n");     /*提示信息*/
    printf("注重 |r|<=11");
    printf("\n输入半径值 r:");
    scanf("%d",&r);
  printf("按任意键显示图形...");
  getch();
  cleardevice();
  setbkcolor(BLACK);
  for(i=20;i<=620;i+=20)           /*使用双循环画点函数画出表格中的纵坐标*/
    for(j=20;j<=460;j++)
 putpixel(i,j,2);
  for(j=20;j<=460;j+=20)           /*使用双循环画点函数画出表格中的横坐标*/
    for(i=20;i<=620;i++)
 putpixel(i,j,2);
  outtextxy(320,245,"0");                                     /*原点坐标*/
  outtextxy(320-5*20,245,"-5");circle(320-5*20,240,2);        /*横坐标值*/
  outtextxy(320+5*20,245,"5");circle(320+5*20,240,2);
  outtextxy(320-10*20,245,"-10");circle(320-10*20,240,2);
  outtextxy(320+10*20,245,"10");circle(320+10*20,240,2);
  outtextxy(320-15*20,245,"-15");circle(320-15*20,240,2);
  outtextxy(320+15*20,245,"15");circle(320+15*20,240,2);
  outtextxy(320,240-5*20,"-5");circle(320,240-5*20,2);        /*纵坐标值*/
  outtextxy(320,240+5*20,"5");circle(320,240+5*20,2);
  outtextxy(320,240-10*20,"-10");circle(320,240-10*20,2);
  outtextxy(320,240+10*20,"10");circle(320,240+10*20,2);
    outtextxy(20,10,"The center of the circle is (0,0) ");    /*坐标轴左上角显示提示信息*/
    setcolor(RED);                 /*标记坐标轴*/
    line(20,240,620,240);   outtextxy(320+15*20,230,"X");
    line(320,20,320,460);   outtextxy(330,20,"Y");
  setcolor(YELLOW);
  MidBresenhamcircle(r);
  setcolor(BLUE);         /*绘制圆*/
  circle(320,240,r*20);
    setcolor(2);
  getch();
  closegraph();
}

上一篇：{应用}几种算法 人气:5061
下一篇：{应用}输入矩阵的非邻元素建立十字链表并按行方式打印该十字链表的完整程序 人气:5502

C语言程序设计视频教程