Implement midpoint circle drawing algorithm

Write a C Program to implement midpoint circle drawing algorithm in Graphics. Here’s simple C Program to implement midpoint circle drawing algorithm in Graphics in C Programming Language.

Below is the source code for C Program to implement midpoint circle drawing algorithm in Graphics which is successfully compiled and run on Windows System to produce desired output as shown below :

SOURCE CODE : :

/*  C Program to implement midpoint circle drawing algorithm in Graphics  */

#include <graphics.h>
#include <conio.h>
#include <math.h>
#include <stdio.h>
 
#define PI 3.14
 
float startangle,endangle;
int x,y;
 
int Can_draw( float theta )
{
        if( theta >= startangle && theta<= endangle )
                return 1;
        return 0;
}
 
void Circlepoints(int x,int y,int xc,int yc)
{
        float theta;
        theta = atan( (float)y/x );
        theta = theta * (180/M_PI);
 
if( Can_draw(theta))
                putpixel(xc+x,yc-y,WHITE);
        if( Can_draw(360-theta))
                putpixel(xc+x,yc+y,WHITE);
 
if( Can_draw(90-theta))
                putpixel(xc+y,yc-x,WHITE);
        if( Can_draw(270+theta))
                putpixel(xc+y,yc+x,WHITE);
 
if( Can_draw(180-theta))
                putpixel(xc-x,yc-y,WHITE);
        if( Can_draw(180+theta))
                putpixel(xc-x,yc+y,WHITE);
 
if( Can_draw(90+theta))
                putpixel(xc-y,yc-x,WHITE);
        if( Can_draw(270-theta))
                putpixel(xc-y,yc+x,WHITE);
}
 
void MidPointcircle(int xc,int yc,int rad)
{
        float d = (5/4.0) - rad;
        x=0,y=rad;
 
        while(y>x)
        {
                if(d<0) 
                        d += 2*x+3;
                else    
                        d+=(2*x)-(2*y)+5,y--;
                x++;
                Circlepoints(x,y,xc,yc);
                delay(90);
        }
}
void main()
{
        int gd=DETECT,gm;
        int radius,xc,yc,choice,temp;
        float xstart,ystart,xend,yend;
        initgraph(&gd,&gm,"..\\bgi");
        do
        {
                clrscr();
                cleardevice();
                printf("\n Enter your choice\n");
                printf("\n 1.Draw a Circle\n 2.Draw a Sector\n 3.Draw an Arc\n 4.Exit\n");
                scanf("%d",&choice);
                switch(choice)
                {
                        case 1: printf("\n Enter the center:");
                                scanf("%d %d",&xc,&yc);
                                printf("\n Enter the radius:");
                                scanf("%d",&radius);
                                cleardevice();
                                startangle=0,endangle=360;
                                MidPointcircle(xc,yc,radius);
                                getch();
                                break;
 
                        case 2: printf("\n Enter the center:");
                                scanf("%d %d",&xc,&yc);
                                printf("\n Enter the radius:");
                                scanf("%d",&radius);
                                printf("\n Enter the startangle:");
                                scanf("%f",&startangle);
                                printf("\n Enter the endangle:");
                                scanf("%f",&endangle);
                                cleardevice();
                                if(startangle>endangle)
                                {
                                        temp=startangle;
                                        startangle=endangle;
                                        endangle=temp;
                                }
                                MidPointcircle(xc,yc,radius);
                                xstart=xc+radius*cos(PI/180*startangle);
                                ystart=yc-radius*sin(PI/180*startangle);
                                xend=xc+radius*cos(PI/180*endangle);
                                yend=yc-radius*sin(PI/180*endangle);
                                line(xc,yc,xstart,ystart);
                                line(xc,yc,xend,yend);
                                getch();
                                break;
 
                        case 3: printf("\n Enter the center:");
                                scanf("%d %d",&xc,&yc);
                                printf("\n Enter the radius:");
                                scanf("%d",&radius);
                                printf("\n Enter the startangle:");
                                scanf("%f",&startangle);
                                printf("\n Enter the endangle:");
                                scanf("%f",&endangle);
                                cleardevice();
                                if(startangle>endangle)
                                {
                                        temp=startangle;
                                        startangle=endangle;
                                        endangle=temp;
                                }
                                MidPointcircle(xc,yc,radius);
                                getch();
                                break;
 
                       case 4:  closegraph();
                }
        }while(choice!=4);
}

Above is the source code for C Program to implement midpoint circle drawing algorithm in Graphics which is successfully compiled and run on Windows System.The Output of the program is shown above .

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