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Program to Draw a Circle using Mid - Point Algorithm CG


#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);
}

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