BRESENHAM’S ELLIPSE DRAWING ALGORITHM
#include "stdio.h"
#include "conio.h"
#include "math.h"
#include "graphics.h"
main()
{
int gd=DETECT,gm;
int xcenter,ycenter,rx,ry;
int p,x,y,px,py,rx1,ry1,rx2,ry2;
initgraph(&gd,&gm,"c:\\tc\\bgi");
printf("Enter The Radius Value:\n");
scanf("%d%d",&rx,&ry);
printf("Enter The xcenter and ycenter Values:\n");
scanf("%d%d",&xcenter,&ycenter);
ry1=ry*ry;
rx1=rx*rx;
ry2=2*ry1;
rx2=2*rx1;
/* REGION 1 */
x=0;
y=ry;
plotpoints(xcenter,ycenter,x,y);
p=(ry1-rx1*ry+(0.25*rx1));
px=0;
py=rx2*y;
while(px<py)
{
x=x+1;
px=px+ry2;
if(p>=0)
y=y-1;
py=py-rx2;
if(p<0)
p=p+ry1+px;
else
p=p+ry1+px-py;
plotpoints(xcenter,ycenter,x,y);
/* REGION 2*/
p=(ry1*(x+0.5)*(x+0.5)+rx1*(y-1)*(y-1)-rx1*ry1);
while(y>0)
{
y=y-1;
py=py-rx2;
if(p<=0)
{
x=x+1;
px=px+ry2;
}
if(p>0)
p=p+rx1-py;
else
p=p+rx1-py+px;
plotpoints(xcenter,ycenter,x,y);
}
}
getch();
return(0);
}
int plotpoints(int xcenter,int ycenter,int x,int y)
{
putpixel(xcenter+x,ycenter+y,6);
putpixel(xcenter-x,ycenter+y,6);
putpixel(xcenter+x,ycenter-y,6);
putpixel(xcenter-x,ycenter-y,6);
}
OUTPUT
Enter The Radius Value(Rx,Ry) : 10 30
Enter The xcenter and ycenter Values : 300 150
RESULT:
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