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Random Bouncing Ball Animation

Simple animation of random balls that bounces within the screen


Source:

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

void drawBall(struct ball *b, int color);

struct ball{
int x, y;
int dx, dy;
int radius;
};

void main()
{
  int gd=0, gm=VGAHI;
  int i;
  struct ball b[10];
  initgraph(&gd, &gm, "");

  for(i=1;i<=15;i++){
 b[i].radius = rand()%20;
 b[i].x=rand()%getmaxx();
 b[i].y=rand()%getmaxy();
 b[i].dx=2;
 b[i].dy=4;
  }

  while(!kbhit())
  {
 delay(5);
 cleardevice();
 for(i=1;i<=15;i++)
 drawBall(&b[i],i);
  }
closegraph();

}

void drawBall(struct ball *b, int color){
 setfillstyle(1,color);
 setcolor(color);
 fillellipse(b->x, b->y, b->radius, b->radius);
 if(b->x+b->radius > getmaxx() || b->x-b->radius<0)
 b->dx = -b->dx;
 if(b->y+b->radius > getmaxy() || b->y-b->radius<0)
 b->dy = -b->dy;

 b->x+=b->dx;
 b->y+=b->dy;
}


Output:

Comments

  1. can u tell the if statement explanation...please i need to understand it

    ReplyDelete
  2. Hi sumbul risvi,

    if statement is to check whether the ball is touching edges of the wall

    getmaxx() -> screen maxX
    getmaxy() -> screen maxY

    (b->x + b->radius)->right edge of the ball
    (b->y + b->radius)->bottom edge of the ball
    (b->x - b->radius)->left edge of the ball
    (b->y - b->radius)->top edge of the ball

    ReplyDelete
  3. nice tutorials and samples

    great work on c graphics samples

    thanks ajai for sharing

    ReplyDelete
  4. What Compiler do you use for this program and is the header file "graphics.h" included in the compiler or did you have to make it yourself?
    luke

    ReplyDelete
  5. I'm using Turbo C3. 'graphics.h' is already included. you have to enable Graphics libraries via 'options>linker>libraries'

    ReplyDelete

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