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### Author Topic: Turbo C Graphics - Draw Circle with pixels  (Read 1300 times)

#### kathir

• Sr. Member
• Posts: 283
##### Turbo C Graphics - Draw Circle with pixels
« on: November 18, 2011, 03:18:32 pm »
Here is the Turbo C example on how to draw a circle with pixel by pixel.

The formula is: x = x + r cos (theta) and y = y + r sin (theta)

Code:
```//Source Code Listing

#include <stdio.h>
#include <graphics.h>
#include <stdlib.h>
#include <conio.h>
#include <bios.h>
#include <math.h>

void DrawCircle(int x, int y, int r, int color)
{
static const double PI = 3.1415926535;
double i, angle, x1, y1;

for(i = 0; i < 360; i += 0.1)
{
angle = i;
x1 = r * cos(angle * PI / 180);
y1 = r * sin(angle * PI / 180);
putpixel(x + x1, y + y1, color);
}
}

void main()
{
int grd, grm, i;
int color, xmax, ymax;
detectgraph(&grd,&grm);
initgraph(&grd, &grm, "");

color = GREEN;
setbkcolor(BLUE);

xmax = getmaxx();
ymax = getmaxy();

setcolor(WHITE);
rectangle(0,0,xmax,ymax);

for(i = 0; i < 230; i += 10)
{
DrawCircle(320, 240, i, color++);
if(color > WHITE)
color = GREEN;
}
getch();
closegraph();
}
```

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