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# Program to draw an ellipse using MidPoint Ellipse Algorithm

Posted By: Easy Tutor     Category: C++ Programming     Views: 13909

## Code for Program to draw an ellipse using MidPoint Ellipse Algorithm in C++ Programming

``` # include <iostream.h>
# include <graphics.h>
# include    <conio.h>
# include     <math.h>

void show_screen( );

void midpoint_ellipse(constint,constint,constint,constint);

int main( )
{
int driver=VGA;
int mode=VGAHI;

int h=0;
int k=0;
int rx=0;
int ry=0;

do
{
show_screen( );

gotoxy(8,10);
cout<<"Central Point of the Ellipse : (h,k) :";

gotoxy(8,11);
cout<<"ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ";

gotoxy(12,13);
cout<<"Enter the value of h = ";
cin>>h;

gotoxy(12,14);
cout<<"Enter the value of k = ";
cin>>k;

gotoxy(8,18);
cout<<"Radius of the Ellipse : (rx,ry) :";

gotoxy(8,19);
cout<<"ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ";

gotoxy(12,21);
cout<<"Enter the radius along x-axis : rx = ";
cin>>rx;

gotoxy(12,22);
cout<<"Enter the radius along y-axis : ry = ";
cin>>ry;

initgraph(&driver,&mode,"..\\Bgi");

setcolor(15);
midpoint_ellipse(h,k,rx,ry);

setcolor(15);
outtextxy(110,460,"Press <Enter> to continue or any other key to exit.");

int key=int(getch( ));

if(key!=13)
break;
}
while(1);

return 0;
}

/*************************************************************************///------------------------  midpoint_ellipse( )  ------------------------///*************************************************************************/void midpoint_ellipse(constint h,constint k,constint a,constint b)
{
int color=getcolor( );

float aa=(a*a);
float bb=(b*b);
float aa2=(aa*2);
float bb2=(bb*2);

float x=0;
float y=b;

float fx=0;
float fy=(aa2*b);

float p=(int)(bb-(aa*b)+(0.25*aa)+0.5);

putpixel((h+x),(k+y),color);
putpixel((h+x),(k-y),color);
putpixel((h-x),(k-y),color);
putpixel((h-x),(k+y),color);

while(fx<fy)
{
x++;
fx+=bb2;

if(p<0)
p+=(fx+bb);

else
{
y--;
fy-=aa2;
p+=(fx+bb-fy);
}

putpixel((h+x),(k+y),color);
putpixel((h+x),(k-y),color);
putpixel((h-x),(k-y),color);
putpixel((h-x),(k+y),color);
}

p=(int)((bb*(x+0.5)*(x+0.5))+(aa*(y-1)*(y-1))-(aa*bb)+0.5);

while(y>0)
{
y--;
fy-=aa2;

if(p>=0)
p+=(aa-fy);

else
{
x++;
fx+=bb2;
p+=(fx+aa-fy);
}

putpixel((h+x),(k+y),color);
putpixel((h+x),(k-y),color);
putpixel((h-x),(k-y),color);
putpixel((h-x),(k+y),color);
}
}

/*************************************************************************///--------------------------  show_screen( )  ---------------------------///*************************************************************************/void show_screen( )
{
restorecrtmode( );
textmode(C4350);

cprintf("\n********************************************************************************");
cprintf("************************-                              -************************");
cprintf("*------------------------ ");

textbackground(1);
cprintf(" MidPoint Ellipse Algorithm ");
textbackground(8);

cprintf(" ------------------------*");
cprintf("*-**********************-                              -**********************-*");
cprintf("*-****************************************************************************-*");

for(int count=0;count<42;count++)
cprintf("*-*                                                                          *-*");

gotoxy(1,46);
cprintf("*-****************************************************************************-*");
cprintf("*------------------------------------------------------------------------------*");
cprintf("********************************************************************************");

gotoxy(1,2);
}

```
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 Easy Tutor author of Program to draw an ellipse using MidPoint Ellipse Algorithm is from United States. Easy Tutor says Hello Friends,I am Free Lance Tutor, who helped student in completing their homework. I have 4 Years of hands on experience on helping student in completing their homework. I also guide them in doing their final year projects.I have share many programs on this website for everyone to use freely, if you need further assistance, than please contact me on easytutor.2ya [at the rate] gmail [dot] comI have special discount scheme for providing tutor services. I am providing tutor service to students from various contries, currently most of my students are from United States, India, Australia, Pakistan, Germany, UK and Canada. I am also here to expand my technical network to receive more opportunity in my career, make friends to help them in resolving their technical problem, learn and share my knowledge, If you like to be my friend, Please send me friend request.Thanks,Happy Programming :) View All Articles

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