Moving ball screensaver, in which two balls are bounchback
from the wall of the console.


*/
#include"graphics.h"
#include"dos.h"
#include"conio.h"
#include"stdlib.h"
#define DELAY 1
#define SOUND 3500
void state(int x,int y,int mode);
int i;
void *ptr1[4],*ptr2[4];
/* 3d Ball */
char ball[20][20]=
{
{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,12,12,12,12,12,12,12,12,0,0,0,0,0,0},
{0,0,0,0,12,12,12,12,12,12,12,12,12,12,12,12,0,0},
{0,0,0,12,12,12,12,12,12,12,12,12,12,12,12,12,12,0,0,0},
{0,0,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,0,0},
{0,0,12,12,12,12,12,15,15,12,12,12,12,12,12,12,12,12,0,0},
{0,12,12,12,12,12,15,12,12,12,12,12,12,12,12,12,12,12,12,0},
{0,12,12,12,12,15,12,12,12,12,12,12,12,12,12,12,12,12,12,0},
{0,12,12,12,15,15,12,12,12,12,12,12,12,12,12,12,12,12,12,0},
{0,12,12,12,15,15,12,12,12,12,12,12,12,12,12,12,12,12,12,0},
{0,12,12,12,15,15,12,12,12,12,12,12,12,12,12,12,12,12,12,0},
{0,12,12,12,12,15,12,12,12,12,12,12,12,12,12,12,12,12,12,0},
{0,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,0},
{0,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,0},
{0,0,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,0,0},
{0,0,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,0,0},
{0,0,0,12,12,12,12,12,12,12,12,12,12,12,12,12,12,0,0,0},
{0,0,0,0,12,12,12,12,12,12,12,12,12,12,12,12,0,0,0,0},
{0,0,0,0,0,0,12,12,12,12,12,12,12,12,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
};
/* Condition to check out of range */
int COND(int x,int y)
{
if (x>10 && x<getmaxx()-10 && y>10 && y<getmaxy()-10)
return 1;
else
return 0;
}
/* This sub-routine will check which path to follow on stiking the wall
of
the container */
void state(int x,int y,int mode)
{
while(COND(x,y)&&!kbhit())
{
putimage(x,y,ptr1[4],COPY_PUT);
putimage(getmaxx()-x,getmaxy()-y,ptr1[4],COPY_PUT);
switch(mode)
{
case 0:
x++;
y++;
break;
case 1:
x++;
y--;
break;
case 2:
x--;
y++;
break;
case 3:
x--;
y--;
break;
}
delay(DELAY);
nosound();
putimage(x,y,ptr2[4],COPY_PUT);
putimage(getmaxx()-x,getmaxy()-y,ptr2[4],COPY_PUT);
}
cleardevice();
if(x>=(getmaxx()-10)||x<=10)
{
sound(SOUND);
switch(mode)
{
case 0:
state(--x,--y,2);
break;
case 1:
state(--x,++y,3);
break;
case 2:
state(++x,--y,0);
break;
case 3:
state(++x,++y,1);
break;
}
}
else
if(y>=getmaxy()-10||y<=10)
{
sound(SOUND);
switch(mode)
{
case 0:
state(--x,--y,1);
break;
case 1:
state(--x,++y,0);
break;
case 2:
state(++x,--y,3);
break;
case 3:
state(++x,++y,2);
break;
}
}
else
exit(0);
}
void main()
{
int gm,gd=DETECT;
int i,j;
initgraph(&gd,&gm,"\tc\tc\bgi");
for(i=0;i<20;i++)
for(j=0;j<20;j++)
if(ball[i][j]!='0')
putpixel(10+i,10+j,ball[j][i]);
getimage(10,10,30,30,ptr1[4]);
cleardevice();
getimage(10,10,30,30,ptr2[4]);
/* start with (20,20) */
state(20,20,0);
getch();
}
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