#include <stdio.h>
#include <conio.h>
#include <graphics.h>
#include <dos.h>
/* color and movement of ball */
void ball_motion(int *x, int *y, int *flag, int *i, int val, int tmp) {
int maxy = getmaxy();
/* set the drawing color */
setcolor(LIGHTRED);
/* color of the ball */
setfillstyle(SOLID_FILL, LIGHTRED);
/* draw ball at the given position */
pieslice(*x, *y, 0, 360, 10);
/* subsequent position of ball in x - axis */
if (*i % 5 == 0) {
if (tmp) {
*x = *x + 3;
} else {
*x = *x - 3;
}
*i = 0;
}
/* subsequent position of ball in y-axis */
if (*flag) {
*y = *y - 10;
} else {
*y = *y + 10;
}
/* reached y axis maximum */
if (*y >= maxy) {
*flag = 1;
} else if (*y <= val) {
/* reached y axix minimum */
*flag = 0;
}
*i = *i + 1;
return;
}
int main() {
/* request auto detection */
int gdriver = DETECT, gmode, err;
int x[4], y[4], stage[4], i, k = 0;
int flag[] = {0, 1, 0, 1};
int maxy, midy;
/* initialize graphic mode */
initgraph(&gdriver, &gmode, "C:/TURBOC3/BGI");
err = graphresult();
if (err != grOk) {
/* error occurred */
printf("Graphics Error: %s\n",
grapherrormsg(err));
return 0;
}
/* used for x-axis movement (i - in ball_motion() API) */
for (i = 0; i < 4; i++) {
stage[i] = 0;
}
/* midy - mid of y axis */
midy = getmaxy() / 2;
/* max of y axis */
maxy = getmaxy();
/* initial position of 4 balls */
x[0] = 0, y[0] = 0;
x[1] = 150, y[1] = maxy;
x[2] = getmaxx() - 100, y[2] = midy;
x[3] = getmaxx(), y[3] = maxy;
/* movement of all 4 balls */
while (!kbhit()) {
/* clears graphic screeen */
cleardevice();
ball_motion(&x[0], &y[0], &flag[0], &stage[0], 0, 1);
ball_motion(&x[1], &y[1], &flag[1], &stage[1], midy, 1);
ball_motion(&x[2], &y[2], &flag[2], &stage[2], midy, 0);
ball_motion(&x[3], &y[3], &flag[3], &stage[3], 0, 0);
/* sleep for 25 milliseconds */
delay(25);
}
getch();
/* deallocate memory allocated for graphic screen */
closegraph();
return 0;
}
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