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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#define CIRCLE "◯"
#define BLACKCIRCLE "⬤"
#define BALLS 2
struct led
{
/*
* 8x8 matrix, we only need 3 bits for each x/y position
* 1 byte per led
* 1 bit -> led on/off
* 3 bits -> x pos (0-7)
* 3 bits -> y pos (0-7)
* 1 bit -> unused
*/
unsigned char enabled:1;
unsigned char x:3;
unsigned char y:3;
unsigned char unused:1;
} matrix[8][8];
struct ball
{
unsigned char x:3;
unsigned char y:3;
unsigned char dirx:1; /* 0 = left, 1 = right */
unsigned char diry:1; /* 0 = down, 1 = up */
} balls[BALLS];
void
printleds(void)
{
printf("\0337");
printf("%s", "\033[8;0F");
printf("%s", "\033[0J");
for (int x = 0; x < 8; x++)
{
for (int y = 0; y < 8; y++)
{
printf("%s ", (matrix[x][y].enabled) ? BLACKCIRCLE : CIRCLE);
}
puts("");
}
printf("\0338");
}
void
playball()
{
for (int i = 0; i < BALLS; i++)
{
if (balls[i].x == 0)
balls[i].dirx = 1;
else if (balls[i].x == 7)
balls[i].dirx = 0;
if (balls[i].y == 7)
balls[i].diry = 1;
else if (balls[i].y == 0)
balls[i].diry = 0;
if (balls[i].dirx == 1)
balls[i].x++;
else
balls[i].x--;
if (balls[i].diry == 1)
balls[i].y--;
else
balls[i].y++;
}
}
int
main(void)
{
for (int x = 0; x < 8; x++)
{
for (int y = 0; y < 8; y++)
{
matrix[x][y].enabled = 0;
matrix[x][y].x = x;
matrix[x][y].y = y;
}
}
printf("\n\n\n\n\n\n\n\n\n");
int x, y = 0;
srand(time(NULL));
for (int i = 0; i < BALLS; i++)
{
balls[i].x = rand() % 7;
balls[i].y = rand() % 7;
balls[i].dirx = rand() % 2;
balls[i].diry = rand() % 2;
}
while (1)
{
/*
matrix[0][y].enabled = !matrix[0][y].enabled;
matrix[2][y].enabled = !matrix[2][y].enabled;
matrix[4][y].enabled = !matrix[4][y].enabled;
matrix[6][y].enabled = !matrix[6][y].enabled;
matrix[8][y].enabled = !matrix[8][y].enabled;
*/
for (int i = 0; i < BALLS; i++)
matrix[balls[i].y][balls[i].x].enabled = 0;
playball();
for (int i = 0; i < BALLS; i++)
matrix[balls[i].y][balls[i].x].enabled = 1;
printleds();
x++;
y++;
if (x == 8 || y == 8)
{
x = 0;
y = 0;
}
usleep(100000);
}
return 0;
}
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