# Implementing Bresenham’s Circle Drawing Algorithm in C++

Here is implementation of Bresenham’s Circle Drawing algorithm in C++.

#include
#include
#include
#include
#include
void circ_bre(int x,int y,int rad);
void display(int,int,int,int);
void main()
{
int gd = DETECT, gm, x,y,r;
initgraph(&gd,&gm,”c:\\tc\\bgi”);
cleardevice();
cout<<"Bresenhams circle generation algorithm "; cout<<"\nEnter the center co-ordinates for circle "; cin>>x>>y;
cout<<"\nEnter the radius of the circle"; cin>>r;
circ_bre(x,y,r);
getch();
closegraph();
}
void circ_bre(int x,int y,int rad)
{
float dp; //initialising the descision parameter.
int x1,y1;
x1 = 0; //initialisng the X,Y cordinates.
y1 = rad;
dp = 3 – 2*rad;
while(x1<=y1) { if(dp<=0) dp += (4 * x1) + 6; else { dp += 4*(x1-y1)+10; y1--; } x1++; display(x1,y1,x,y); } } void display (int x1,int y1,int x,int y) { putpixel(x1+x,y1+y,WHITE); //plotting the pixels. putpixel(x1+x,y-y1,WHITE); putpixel(x-x1,y1+y,WHITE); putpixel(x-x1,y-y1,WHITE); putpixel(x+y1,y+x1,WHITE); putpixel(x+y1,y-x1,WHITE); putpixel(x-y1,y+x1,WHITE); putpixel(x-y1,y-x1,WHITE); } [/cpp] Output:

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