Draw a Circle : Mid-Point Algorithm


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C Program

#include<graphics.h>
#include<conio.h>
#include<stdio.h>
void plotpoints(int x, int y, int cx, int cy) {
	putpixel(cx + x, cy + y, 4);
	putpixel(cx - x, cy + y, 4);
	putpixel(cx + x, cy - y, 4);
	putpixel(cx - x, cy - y, 4);
	putpixel(cx + y, cy + x, 4);
	putpixel(cx - y, cy + x, 4);
	putpixel(cx + y, cy - x, 4);
	putpixel(cx - y, cy - x, 4);
}
void main() {
	int cx, cy, x = 0, y, r, p;
	int gd = DETECT, gm = DETECT;
	clrscr();
	printf("Enter the center \n");
	scanf("%d%d", &cx, &cy);
	printf("Enter the radius : ");
	scanf("%d", &r);
	y = r;
	p = 1 - r;
	initgraph(&gd, &gm, "");
	cleardevice();
	while (x < y) {
		plotpoints(x, y, cx, cy);
		x++;
		if (p < 0)
			    p += 2 * x + 1; else {
			y--;
			p += 2 * (x - y) + 1;
		}
	}
	getch();
}





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