implement Test; include "sys.m"; include "draw.m"; Test: module{	init:	fn(ctxt: ref Draw->Context, argv: list of string);}; init(ctxt: ref Draw->Context, nil: list of string){	sys := load Sys Sys->PATH;	draw := load Draw Draw->PATH;	Display, Font, Rect, Point, Image, Screen: import draw; 	#	# Set up connection to display, or use the existing one	# if provided.	#	display: ref Display;	disp: ref Image;	if (ctxt == nil) {		display = draw->Display.allocate(nil);		disp = display.image;	} else {		display = ctxt.display;		disp = ctxt.screen.newwindow(display.image.r, Draw->White);	} 	#	# Initialize colours.	#	red := display.color(Draw->Red);	blue := display.color(Draw->Blue);	white := display.color(Draw->White);	yellow := display.color(Draw->Yellow);	ones := display.ones; 	#	# Paint the screen red.	#	disp.draw(disp.r, red, ones, disp.r.min);	sys->sleep(5000); 	#	# Texture a region with rectangular tiles.	#	texture := display.newimage(((0,0),(2,3)), disp.ldepth, 1, 0);	texture.clipr = ((-10000,-10000),(10000,10000));	# put something in the texture	texture.draw(((0,0),(1,3)), blue, ones, (0,0));	texture.draw(((0,0),(2, 1)), blue, ones, (0,0));	# use texture as both source and mask to let	# destination colour show through	disp.draw(((100,100),(200,200)), texture, texture, (0,0));	sys->sleep(5000); 	#	# White-out a quarter of the pixels in a region,	# to make the region appear shaded.	#	stipple := display.newimage(((0,0),(2,2)), disp.ldepth, 1, 0);	stipple.draw(((0,0),(1,1)), ones, ones, (0,0));	disp.draw(((100,100),(300,200)), white, stipple, (0,0));	sys->sleep(5000); 	#	# Draw textured characters.	#	font := Font.open(display, "*default*");	disp.text((100,210), texture, (0,0), font, "Hello world");	sys->sleep(5000); 	#	# Draw picture in elliptical frame.	#	delight := display.open("/icons/delight.bit");	piccenter := delight.r.min.add(delight.r.max).div(2);	disp.fillellipse((200,100), 150, 50, delight, piccenter);	disp.ellipse((200,100), 150, 50, 3, yellow, (0,0));	sys->sleep(5000); 	#	# Draw a parabolic brush stroke using an elliptical brush	# to reveal more of the picture, consistent with what's	# already visible.	#	dx : con 15;	dy : con 3;	brush := display.newimage(((0,0),(2*dx+1,2*dy+1)), disp.ldepth,                               0, 0);	brush.fillellipse((dx,dy), dx, dy, ones, (0,0));	for(x:=delight.r.min.x; x<delight.r.max.x; x++){		y := (x-piccenter.x)*(x-piccenter.x)/80;		y += 2*dy+1;	# so whole brush is visible at top		xx := x+(200-piccenter.x)-dx;		yy := y+(100-piccenter.y)-dy;		disp.gendraw(((xx,yy),(xx+2*dx+1,yy+2*dy+1)),                       delight, (x-dx, y-dy), brush, (0,0));	}	for (i := 0; i < 500; i++) {		disp.draw(disp.r, disp, ones, (0, 10));		sys->sleep(5);	}}