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#include "lzy.h"
#include "cfg.h"
#include "rotrect.h"
static long tick = 0;
static void
draw_square(double size, double angle)
{
rotrect(DISPLAY_WIDTH / 2.0, DISPLAY_HEIGHT / 2.0, size, size, angle);
}
void
background_draw(void)
{
tick += 1;
LZY_DrawSetColor(BLACK);
draw_square(300 * sin((double)tick / 50), (double)tick / 40);
draw_square(300 * sin((double)tick / 40), (double)tick / 30);
draw_square(300 * sin((double)tick / 30), (double)tick / 20);
}
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