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Displaying  Source Code(s)  
 

 
Program to implement DDA Circle 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:
float x,y,r,d,x1,y1;
public:
myCircle(); //Constructor
void showCircle();
int sign(int);
};

int myCircle::sign(int xx)
{
if(xx<0)
return -1;
if(xx==0)
return 0;
if(xx>0)
return 1;
return 0;
}
myCircle::myCircle()
{
x=0;y=0;
cout<<"
"Enter The Co-Ordinates Of The Circle ":=";
cin>>x1>>y1;
cout<<"
"Enter The Radius Of The Circle ":=";
cin>>r;
}

void myCircle::showCircle()
{
char *s;
int s1,s2,ic;
x=x1;y=y1;
float i=0;
while(i<=360)
{
x=x1+r*cos(i);
y=y1+r*sin(i);
putpixel((x+320),480-(y+240),6);
i+=0.5;
}
setcolor(15);
sprintf(s,"Center(%d,%d)",x1,y1);
outtextxy(40,10,"The Center Is At :=");
outtextxy(40,20,s);
sprintf(s,"Radius=%g",r);
outtextxy(40,30,s);
getch();
}
void main()
{
int gd=DETECT,gm,i,j,xx=220,xxx=430;
clrscr();
myCircle a;
char *mess[]={"D","D","A"," ","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=19;i<12,j>=10;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();
closegraph();
}

 

 

 

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