Bresenham Circle algorithm C++ Code

Learn here Bresenham Circle algorithm C++ Code.

#include <stdio.h>

#include <graphics.h>

void Bres_circle(double x1, double y1, double r)

{

double x = 0, y = r;

double p = 3 - (2 * r);

while(x <= y)

{

putpixel(x1 + x, y1 + y, WHITE);

putpixel(x1 - x, y1 + y, WHITE);

putpixel(x1 + x, y1 - y, WHITE);

putpixel(x1 - x, y1 - y, WHITE);

putpixel(x1 + y, y1 + x, WHITE);

putpixel(x1 + y, y1 - x, WHITE);

putpixel(x1 - y, y1 + x, WHITE);

putpixel(x1 - y, y1 - x, WHITE);

x=x + 1;

if(p<0)

p=p + 4*(x) + 6;

else

{

p=p + 4*(x - y) + 10;

y=y - 1;

}

delay(100);

}

int main()

{

double x1, y1, r;

int gd = DETECT, gm;

initgraph(&gd, &gm, "");

printf("Enter the starting co - ordinates of a center (x, y): ");

scanf("%lf %lf", &x1, &y1);

printf("Enter the value of radius: ");

scanf("%lf", &r);

Bres_circle(x1, y1, r);

getch();

closegraph();

return 0;

}

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