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Displaying  Source Code(s)  
 

 
Program to implement Bresenham's Ellipse Drawing Algorithm.

--------------------------------------------------------------------------------



#include<iostream.h>
#include<graphics.h>
#include<conio.h>
#include<math.h>
#include<dos.h>
#include<stdlib.h>
#include<stdio.h>
class myCircle
{
private:
int x,y,r,d,x1,y1,minor,major,dtheta,ratio,a,b,x2,y2;
public:
myCircle(); //Constructor
void showCircle();
};

myCircle::myCircle()
{
x=0;y=0;
cout<<"
"Enter The Major & Minor Axis Of Ellipse ":=";
cin>>major>>minor;
cout<<"
"Enter The Center Of The Ellipse ":=";
cin>>x>>y;
}

void myCircle::showCircle()
{
char *s;
int ax,ay;
float ar;
x1=1;
ratio=major/minor;
getaspectratio(&ax,&ay);
ar=1;
// ar=ay/ax;
while(x1<=major)
{
y1=minor*sqrt((1-(x1*x1/major*major)));
putpixel((x+x1*ar+320),(y+y1+240),5);
putpixel((x+x1*ar+320),(y-y1+240),5);
putpixel((x-x1*ar+320),(y-y1+240),5);
putpixel((x-x1*ar+320),(y+y1+240),5);
dtheta=1/sqrt(x1*x1+y1*y1);
// x2=x1+cos(dtheta)-ratio*y1*sin(dtheta);
// y2=y1+cos(dtheta)+1/ratio*x1*sin(dtheta);
x1++;
// y1=y2;
}
setcolor(5);
outtextxy(318+x,235+y,".");
setcolor(15);
sprintf(s,"Center(%d,%d)",x,y);
outtextxy(20,10,"The Center Is At");
outtextxy(20,20,s);
sprintf(s,"Radius=%d",r);
outtextxy(20,30,s);
getch();
}
void main()
{
int gd=DETECT,gm,i,j,xx=190,xxx=480;
clrscr();
myCircle a;
char *mess[]={"B","R","E","S","E","N","H","A","M","'","S"," ","C","I","R","C","L","E"," ","A","L","G","O","R","I","T","H","M"};
initgraph(&gd,&gm,"..\bgi");
cleardevice();
rectangle(120,40,320,240);
rectangle(320,40,520,240);
rectangle(120,240,320,440);
rectangle(320,240,520,440);
for(i=0,j=27;i<16,j>=14;i++,j--)
{
xx+=10;
outtextxy(xx,10,mess[i]);
xxx-=10;
outtextxy(xxx,10,mess[j]);
delay(100);
}
for(i=130;i<=510;i+=10)
for(j=50;j<=430;j+=10)
putpixel(i,j,15);
for(i=130;i<=510;i+=10)
{
if(i==320)
continue;
outtextxy(i,237,"+");
}
for(i=50;i<=430;i+=10)
{
if(i==240)
continue;
outtextxy(317,i,"-");
}
outtextxy(310,230,"O");
outtextxy(530,240,"X");
outtextxy(320,450,"-Y");
outtextxy(100,240,"-X");
outtextxy(320,30,"Y");
a.showCircle();
}

 

 

 

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