tanqiu.c

计算机图形学

#include "graphics.h"
#include "math.h"
void circlepoints(int x,int y,int a,int b)
 {    putpixel(x+a,y+b,6);
      putpixel(-x+a,y+b,6);
      putpixel(x+a,-y+b,6);
      putpixel(-x+a,-y+b,6);
 }

void circlepoints1(int x,int y,float f)
 {
     putpixel((x+200-250)*cos(f)-(y+150-200)*sin(f)+250,(x+200-250)*sin(f)+(y+150-200)*cos(f)+200,2);
      putpixel((-x+200-250)*cos(f)-(y+150-200)*sin(f)+250,(-x+200-250)*sin(f)+(y+150-200)*cos(f)+200,2);
      putpixel((x+200-250)*cos(f)-(-y+150-200)*sin(f)+250,(x+200-250)*sin(f)+(-y+150-200)*cos(f)+200,2);
      putpixel((-x+200-250)*cos(f)-(-y+150-200)*sin(f)+250,(-x+200-250)*sin(f)+(-y+150-200)*cos(f)+200,2);
 }


void dda(int a,int b,float k,float l)
{

  float dy,dx,y,m,j,x;
  dx=100;
  dy=0;
  m=dy/dx;
  y=50;
  for(x=50;x<=150;x++)
  {
    x=(x-a)*k-(y-b)*l+a;
    j=(x-a)*l+(y-b)*k+b;

   putpixel((int)x,(int)j,2);
   y+=m;
   }
}
/*void circle1(int x,int y,int r)

{
   int a,b;
   float d;
   a=0;b=r;
   d=5.0/4-r;
   putpixel(a+x,b+y,2);
while(b>a)
{  if(d<=0)
     d+=2.0*a+3;
     else
     { d+=2.0*(a-b)+50;
       b--;
     }
       a++;
       putpixel(a+x,b+y,2);
     }

} */

/*void ar(int a,int b)
{

   int x,y,d;


    x=0;
    y=50;

 circlepoints(x,y,a,b);
 x=1;
  circlepoints(x,y,a,b);
  while (y>=0)
  { if(d>=0)
    { d=d-2*y+1;
     y--;}
     else
     {d=d+2*x+1;
     x++;
     }
     circlepoints(x,y,a,b);
 }
 }*/

void main()
{  int driver=DETECT,mode; int x,y,d,a=100,b=50,t=5;
   float k,l,f;
registerbgidriver(EGAVGA_driver);
 initgraph(&driver,&mode,"\\tc");                                             /* 对于svga256必需执行该函数以安装BGI驱动 */
initgraph(&driver,&mode,"\\tc");             /* 执行TC默认的BGI初始化函数 */


 while(!kbhit())
 { if((b==430)&&(t==5))t=-5;
   if((b==50)&&(t==-5))t=5;
   b+=t;
   x=0;
   y=50;

   circlepoints(x,y,a,b);
   x=1;
   circlepoints(x,y,a,b);
   while (y>=0)
   { if(d>=0)
    { d=d-2*y+1;
     y--;}
     else
     {d=d+2*x+1;
     x++;
     }
     circlepoints(x,y,a,b);
  }

   if(f=3.14159) f=0;
      f+=0.00001;
   x=0;
   y=30;

   circlepoints1(x,y,f);
   x=1;
   circlepoints1(x,y,f);
   while (y>=0)
   { if(d>=0)
    { d=d-2*y+1;
     y--;}
     else
     {d=d+2*x+1;
     x++;
     }
     circlepoints1(x,y,f);
}
   delay(5000);
   if(f=3.14159) f=0;
      f+=0.00001;
  circle((200-250)*cos(f)-(150-200)*sin(f)+250,(200-250)*sin(f)+(150-200)*cos(f)+200,20);
  cleardevice();
 }

  getch();

 closegraph();

}