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Midpoint_Circle_Drawing.cpp

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Midpoint_Circle_Drawing.cpp

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// Write a Program to implement a Midpoint Circle Drawing Algorithm.

#include <graphics.h>

#include <stdlib.h>

#include <math.h>

#include <stdio.h>

#include <conio.h>

#include <iostream>

using namespace std;

class bresen

{

float x, y,a, b, r, p;

public:

void get();

void cal();

};

int main (void)

{

bresen b;

b.get ();

b.cal ();

getch ();

}

void bresen::get()

{

cout<<"Enter Center And Radius:" <<endl;

cout<< "Enter (a, b):";

cin>>a>>b;

cout<<"Enter R:";

cin>>r;

}

void bresen::cal()

{

/* request auto detection */

int gdriver = DETECT,gmode, errorcode;

int midx, midy, i;

/* initialize graphics and local variables */

initgraph (&gdriver, &gmode, " ");

/* read result of initialization */

errorcode = graphresult ();

if (errorcode != grOk) /*an error occurred */

{

printf("Graphics error: %s \n", grapherrormsg (errorcode));

printf ("Press any key to halt:");

getch ();

exit (1); /* terminate with an error code */

}

x=0;

y=r;

putpixel (a, b+r, RED);

putpixel (a, b-r, RED);

putpixel (a-r, b, RED);

putpixel (a+r, b, RED);

p=(5/4)-r;

while(x<=y)

{

if (p<0)

p+= (4*x)+6;

else

{

p+=(2*(x-y))+5;

y--;

}

x++;

putpixel (a+x, b+y, RED);

putpixel (a-x, b+y, RED);

putpixel (a+x, b-y, RED);

putpixel (a+x, b-y, RED);

putpixel (a+x, b+y, RED);

putpixel (a+x, b-y, RED);

putpixel (a-x, b+y, RED);

putpixel (a-x, b-y, RED);

}

}