Midpoint Circle Algorithm in C and C++

Here you will get the program for midpoint hover calculation in C and C++. It is a calculation utilized in PC illustrations for drawing circle.

This program will work in Turbo C or Turbo C++ compiler as it utilizes graphics.h header record.

Change the way of BGI record inside initgraph() work as indicated by your framework to make this program run.

Program for Midpoint Circle Algorithm in C

#include<stdio.h>
#include<graphics.h>
 
void drawcircle(int x0, int y0, int radius)
{
    int x = radius;
    int y = 0;
    int err = 0;
 
    while (x >= y)
    {
	putpixel(x0 + x, y0 + y, 7);
	putpixel(x0 + y, y0 + x, 7);
	putpixel(x0 - y, y0 + x, 7);
	putpixel(x0 - x, y0 + y, 7);
	putpixel(x0 - x, y0 - y, 7);
	putpixel(x0 - y, y0 - x, 7);
	putpixel(x0 + y, y0 - x, 7);
	putpixel(x0 + x, y0 - y, 7);
 
	if (err <= 0)
	{
	    y += 1;
	    err += 2*y + 1;
	}
 
	if (err > 0)
	{
	    x -= 1;
	    err -= 2*x + 1;
	}
    }
}
 
int main()
{
	int gdriver=DETECT, gmode, error, x, y, r;
	initgraph(&gdriver, &gmode, "c:\\turboc3\\bgi");
 
	printf("Enter radius of circle: ");
	scanf("%d", &r);
 
	printf("Enter co-ordinates of center(x and y): ");
	scanf("%d%d", &x, &y);
	drawcircle(x, y, r);
 
	return 0;
}

Program for Midpoint Circle Algorithm in C++

#include<iostream.h>
#include<graphics.h>
 
void drawcircle(int x0, int y0, int radius)
{
    int x = radius;
    int y = 0;
    int err = 0;
 
    while (x >= y)
    {
	putpixel(x0 + x, y0 + y, 7);
	putpixel(x0 + y, y0 + x, 7);
	putpixel(x0 - y, y0 + x, 7);
	putpixel(x0 - x, y0 + y, 7);
	putpixel(x0 - x, y0 - y, 7);
	putpixel(x0 - y, y0 - x, 7);
	putpixel(x0 + y, y0 - x, 7);
	putpixel(x0 + x, y0 - y, 7);
 
	if (err <= 0)
	{
	    y += 1;
	    err += 2*y + 1;
	}
 
	if (err > 0)
	{
	    x -= 1;
	    err -= 2*x + 1;
	}
    }
}
 
int main()
{
	int gdriver=DETECT, gmode, error, x, y, r;
	initgraph(&gdriver, &gmode, "c:\\turboc3\\bgi");
 
	cout<<"Enter radius of circle: ";
	cin>>r;
 
	cout<<"Enter co-ordinates of center(x and y): ";
	cin>>x>>y;
	drawcircle(x, y, r);
 
	return 0;
}

Output