Here is a C program to draw a circle on screen using graphics.h header file. In this program, we will draw a circle on screen having centre at mid of the screen and radius of 80 pixels. We will use outtextxy and circle functions of graphics.h header file. Below is the detailed descriptions of graphics functions used in this program.
| Function | Description |
|---|---|
| initgraph | It initializes the graphics system by loading the passed graphics driver then changing the system into graphics mode. |
| getmaxx | It returns the maximum X coordinate in current graphics mode and driver. |
| getmaxy | It returns the maximum Y coordinate in current graphics mode and driver. |
| outtextxy | It displays a string at a particular point (x,y) on screen. |
| circle | It draws a circle with radius r and centre at (x, y). |
| closegraph | It unloads the graphics drivers and sets the screen back to text mode. |
C program to draw circle using c graphics
In this program we first initialize graphics mode, by passing graphics driver(DETECT), default graphics mode and specifies the directory path where initgraph looks for graphics drivers (*.BGI). It is the first step you need to do during graphics programming. Setting graphics driver as DETECT, means instructing the compiler to auto detect graphics driver. Here we are using getmaxx and getmaxy function to find the center coordinate of the screen.
#include<stdio.h>
#include<graphics.h>
int main(){
int gd = DETECT,gm;
int x ,y ,radius=80;
initgraph(&gd, &gm, "C:\\TC\\BGI");
/* Initialize center of circle with center of screen */
x = getmaxx()/2;
y = getmaxy()/2;
outtextxy(x-100, 50, "CIRCLE Using Graphics in C");
/* Draw circle on screen */
circle(x, y, radius);
closegraph();
return 0;
}
Program Output
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