/*
 * lines.c: draw random colored lines, starting over from scratch randomly
 * sean caron (scaron@umich.edu
*/

/*
  * The paradigm here is that we must always include u.h
  * first and libc.h second, and anything else after that.
*/

#include <u.h>
#include <libc.h>
#include <draw.h>
#include <cursor.h>

int main(void);

int main(void) {
	Point blah, blah2;
	Image *palette;
	long a,b;
	initdraw(nil, nil, "win2");
	int t;

	palette = allocimagemix(display, a, b);

	/*
	  * initdraw() sets up some global variables,
	  *
	  * Display *display
	  * Image *screen
	  * Screen *_screen
	  * Font *font
	  *
	  * ZP is a constant point (0,0).
	*/

	blah.x = screen->r.min.x + nrand(screen->r.max.x);
	blah2.x = screen->r.min.x + nrand(screen->r.max.x);
	blah.y = blah2.y = screen->r.min.y + nrand(screen->r.max.y);

	while (1) {

	line(screen, blah, blah2, Endsquare,
		Endsquare, 2, palette, blah);

		/* draw a horizontal line */

		t = nrand(100);

		if ( t > 50 ) {

			blah.x = screen->r.min.x + nrand(screen->r.max.x);
			blah2.x = screen->r.min.x + nrand(screen->r.max.x);
			blah.y = blah2.y = screen->r.min.y + nrand(screen->r.max.y);

		}

		/* draw a vertical line */

		else if ( t < 50 ) {
			blah.y = screen->r.min.y + nrand(screen->r.max.y);
			blah2.y = screen->r.min.y + nrand(screen->r.max.y);
			blah.x = blah2.x = screen->r.min.x + nrand(screen->r.max.x);
		}
		
		/* clear the screen */

		else {

			draw(screen, screen->r, display->white, nil, ZP);

		}

		/* Pick random values for red, green, blue but force alpha to 0xFF (opaque) */

		a = b =  (lnrand(0xFF) << 24) + (lnrand(0x01) << 16) + (lnrand(0xFF) << 8) + 0xFF;

		palette = allocimagemix(display, a, b);

		flushimage(display, 1);

		sleep(10);

	}

	closedisplay(display);
}