DRAW A CIRCLE USING MIDPOINT ALGORITHM
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
#include<dos.h>
void main()
{
/*
request auto detection */
int gdriver = DETECT, gmode, errorcode;
int x1,x2,x3,x4,xc,yc,r,y1,y2;
char msg[15];
/*
initialize graphics and local variables */
initgraph(&gdriver, &gmode, "");
/*
read result of initialization */
errorcode = graphresult();
/*
an error occurred */
if
(errorcode != grOk)
{
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1);
}
printf("Enter the value for xc,yc,r:");
scanf("%d%d%d",&xc,&yc,&r);
circlemidpoint(xc,yc,r);
getch();
closegraph();
}
void circlemidpoint(int xc,int yc,int r)
{
int
x=0,y=r,p=1-r;
void
circleplotpoints(int,int,int,int);
circleplotpoints(xc,yc,x,y);
while(x<y)
{
x++;
if(p<0)
p+=2*x+1;
else
{
y--;
p+=2*(x-y)+1;
}
circleplotpoints(xc,yc,x,y);
}
}
void
circleplotpoints(int xc,int yc,int x,int y)
{
putpixel(xc+x,yc+y,YELLOW);
putpixel(xc-x,yc+y,YELLOW);
putpixel(xc+x,yc-y,GREEN);
putpixel(xc-x,yc-y,GREEN);
putpixel(xc+y,yc+x,GREEN);
putpixel(xc-y,yc+x,RED);
putpixel(xc+y,yc-x,RED);
putpixel(xc-y,yc-x,RED);
}
OUTPUT:-
Enter the value for xc, yc, r:
250
150
125
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