C Program for Bouncing Ball Animation Using C Graphics

Write a program in C for bouncing ball animation using graphics.h header file

In this program, we will draw a red color ball move it vertically up and down like a bouncing ball. We will use below mentioned functions 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.
setcolor It changes the current drawing colour. Default colour is white. Each color is assigned a number, like BLACK is 0 and RED is 4. Here we are using colour constants defined inside graphics.h header file.
setfillstyle It sets the current fill pattern and fill color.
circle It draws a circle with radius r and centre at (x, y).
floodfill It is used to fill a closed area with current fill pattern and fill color. It takes any point inside closed area and color of the boundary as input.
cleardevice It clears the screen, and sets current position to (0, 0).
kbhit It is used to determine whether a key is pressed or not. It returns a non-zero value if a key is pressed otherwise zero.
delay It is used to suspend execution of a program for a M milliseconds.
closegraph It unloads the graphics drivers and sets the screen back to text mode.

C program for bouncing ball graphics animation

In this program, we first draw a red color ball on screen having center at (x, y) and then erases it using cleardevice function. We again draw this ball at center (x, y + 5), or (x, y - 5) depending upon whether ball is moving down or up. This will look like a bouncing ball. We will repeat above steps until user press any key on keyboard.

#include <stdio.h>
#include <conio.h>
#include <graphics.h>
#include <dos.h>

int main() {
 int gd = DETECT, gm;
 int i, x, y, flag=0;
 initgraph(&gd, &gm, "C:\\TC\\BGI");

 /* get mid positions in x and y-axis */
 x = getmaxx()/2;
 y = 30;


 while (!kbhit()) {
  if(y >= getmaxy()-30 || y <= 30)
     flag = !flag;
     /* draws the gray board */
     setcolor(RED);
     setfillstyle(SOLID_FILL, RED);
     circle(x, y, 30);
     floodfill(x, y, RED);

 /* delay for 50 milli seconds */
 delay(50);

 /* clears screen */
 cleardevice();
 if(flag){
     y = y + 5;
 } else {
     y = y - 5;
 }
    }

    getch();
    closegraph();
    return 0;
}
Program Output
Here is the screenshot of bouncing ball. C graphics program for moving ball animation
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