js/draw.js


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function draw (lex, x, y, erasing) {
	stamp (canvas, brush, x, y, erasing)
}

function stamp (canvas, brush, x, y, erasing) {
	hh = brush.w/2|0
	brush.forEach(function(lex, s, t){
		s += x-hh
		t += y-hh
		if (s >= 0 && s < canvas.w && t >= 0 && t < canvas.h) {
		  if (erasing) {
        canvas.aa[t][s].erase(lex)
		  }
		  else {
        canvas.aa[t][s].clone(lex)
		  }
		}
	})
}