stamp() seems to work quite well, in fact! For reference, I modified my code to look like:
class PlayState extends FlxState {
var canvas:FlxSprite;
var totalTime:Int = 0;
override public function create():Void {
super.create();
canvas = new FlxSprite();
canvas.makeGraphic(128, 128, FlxColor.WHITE, true);
add(canvas);
}
override public function update(elapsed:Float):Void {
super.update(elapsed);
totalTime += 1;
var brush = new FlxSprite().makeGraphic(2, 2, 0xFFFF0000);
canvas.stamp(brush, totalTime % 128, Std.int(totalTime / 128));
}
}
...and it behaves as I expected.
I think that the line totalTime += 1, despite being a terrible naming job on my part, allowed for the red line to cover the square quickly (as opposed to totalTime += elapsed).
Is stamp() plus a brush an appropriate (efficient) solution even when drawing pixels based on user input, such as with a mouse click/drag or touchscreen? I think that I overlooked that function before because it seemed to be intended for copying entire sprites.
Thank you so much for your quick and detailed response!
