window.devicePixelRatio scaling issue

[dragoncoder047]

just figured this out now:

langton-music/js/canvastools.js

Lines 144 to 145 in 92d1f4f

	canvas.width = (canvas.parentElement.clientWidth - 10) * ratio;
	canvas.height = (canvas.parentElement.clientHeight - 10) * ratio;

if window.devicePixelRatio is >1 (as it is on my macbook's screen) the canvas element will wind up going off the side and bottom of the screen