Program to Draw a Circle using Mid - Point Algorithm -- Computer Graphics Lab

Program to Draw a Circle using Mid - Point Algorithm

/*** Program to Draw a Circle using Mid - Point Algorithm ***/

#include <stdio.h>

#include <dos.h>

#include <graphics.h>

void circleMidpoint(int, int, int);

void drawCircle(int, int, int, int);

void main()

{

int xc, yc, r;

int gd = DETECT, gm;

initgraph(&gd, &gm, "");

printf("Enter center coordinates of circle: ");

scanf("%d %d", &xc, &yc);

printf("Enter radius of circle: ");

scanf("%d", &r);

circleMidpoint(xc, yc, r);

getch();

}

void circleMidpoint(int xc, int yc, int r)

{

int x = 0, y = r;

int p = 1 - r;

while (x < y)

{

drawCircle(xc, yc, x, y);

x++;

if (p < 0)

p = p + 2 * x + 1;

else

{

y--;

p = p + 2 * (x - y) + 1;

}

drawCircle(xc, yc, x, y);

delay(50);

}

}

void drawCircle(int xc, int yc, int x, int y)

{

putpixel(xc+x, yc+y, RED);

putpixel(xc-x, yc+y, RED);

putpixel(xc+x, yc-y, RED);

putpixel(xc-x, yc-y, RED);

putpixel(xc+y, yc+x, RED);

putpixel(xc-y, yc+x, RED);

putpixel(xc+y, yc-x, RED);

putpixel(xc-y, yc-x, RED);

}

--

Don't ever give up.

Even when it seems impossible,

Something will always

pull you through.

The hardest times get even

worse when you lose hope.

As long as you believe you can do it, You can.

But When you give up,

You lose !

I DONT GIVE UP.....!!!

with regards

prem sasi kumar arivukalanjiam