#include <stdio.h>
#include <sys/ioctl.h>


/* Plot a solid color block at screen x, y
*/
int WIDTH = 80;
int HEIGHT= 24;
int GREY  = (15 + 6*6*6);

void putbcyx (int cl, int ch,int y, int x) {
	printf("\e[%d;%dH\e[48;5;%dm%c", y+1, x+1, cl, ch);
}
void putfcyx (int cl, int ch,int y, int x) {
	printf("\e[%d;%dH\e[0;38;5;%dm%c", y+1, x+1, cl, ch);
}

int colorCounter=0;
int dir=1;
int x, y;
int c=5,d=5,e=5;

int sp=1;
int newSpread (int i) {
	return random()%(i*2+1) - i;
}


void building (void) {
 int w = random()%10;
 int h = random()%20+2;
 int x = random()%WIDTH;
 int m, n;
 int c, cc=random()%3+1;
	for (m=w; 0<m; --m) {
		for (n=h; 0<n; --n) {
			c = (n%2) && (0<m) && (m<w-1) && random()%2;
			if (c) putbcyx(GREY+cc, '.', HEIGHT-n, x+m);
			else   putbcyx(GREY+cc, ' ', HEIGHT-n, x+m);
		}
	}
}

void star (int cl, int ch) {
 int x = random()%WIDTH;
 int y = random()%(HEIGHT-21); 
	putfcyx(cl, ch, y, x);
}

int main (void) {
 struct winsize win;
 int i, c, loop = 0x40000000;
	ioctl(1, TIOCGWINSZ, &win);
   WIDTH = win.ws_col;
   HEIGHT = win.ws_row;
	printf("\e[?25l\e[2J");
	setbuf(stdout,0);

	while (loop--) {
		// Shift stars to right
		if (!(loop%256)) {
			printf("\e[1H");
			for (i=0; i<HEIGHT-20-1; i+=1) { printf("\e[%d@\n", random()%4); } // P or @  shift each row over then move cursor down (no scroll)
		}

		// Shift city down
		if (!(loop%16284)) { printf("\e[%d;%dr\e[%dH\eM\e[r", HEIGHT-20, HEIGHT, HEIGHT-20); }

		// Render a star
		if (!(loop%32))  { star(GREY+random()%25, '.'); }

		// Render a building
		if (!(loop%256)) { building(); }

		// Erase random star position
		if (!(loop%16)) { star(0, ' '); }
			
		usleep(10);
	}

	return 0;
}