#include <u.h>#include <libc.h>#include <draw.h>#include <cursor.h> Image *col;Image *black; int chatty9p = 1; voidmain(void) {	int i;	ulong type = ARGB32; 	// newwindow("-r 0 0 800 400");	if(initdraw(nil, nil, "tri") < 0)		exits("initdraw"); 	black = allocimage(display, Rect(0, 0, Dx(screen->r), Dy(screen->r)), ARGB32, 0, DBlack); 	for(i = 0; i < 0xff; i++) {		col = allocimage(display, Rect(0,0,1,1), type, 1, setalpha(DWhite, 0xff-i));		draw(black, Rect(0,i,200,i+1), col, nil, ZP);		freeimage(col); 		col = allocimage(display, Rect(0,0,1,1), type, 1, setalpha(DRed, 0xff-i));		draw(black, Rect(200,i,400,i+1), col, nil, ZP);		freeimage(col);		col = allocimage(display, Rect(0,0,1,1), type, 1, setalpha(DGreen, 0xff-i));		draw(black, Rect(400,i,600,i+1), col, nil, ZP);		freeimage(col);		col = allocimage(display, Rect(0,0,1,1), type, 1, setalpha(DBlue, 0xff-i));		draw(black, Rect(600,i,800,i+1), col, nil, ZP);		freeimage(col);		}	col = allocimage(display, Rect(0, 0, 1, 1), type, 1, DBlack);	draw(black, Rect(0, 260, 800, 300), col, nil, ZP);	draw(screen, screen->r, black, nil, ZP); 	draw(screen, Rect(0, 360, 800, 400), col, nil, ZP);  	flushimage(display, 1);	sleep(10000);	closedisplay(display);}