Move image off screen [SOLVED]

Thank you Ganble, you're right it's not an issue with integers! You can probably tell I'm only a very amateur programmer!

In that case, setLCDOverlay doesn't work with negative numbers, but this time I have no idea why.

An example run in the emulator (same results on watch):

img = Graphics.createArrayBuffer(100, 100, 8).setColor('#f00').fillRect(0, 0, 100, 100);
var y = 0;
Bangle.setLCDOverlay(img, 0, y);

Draw a 100px square, colour it red, display in on the overlay. Negative number doesn't work, see third screenshot of blank screen.

By contrast, g.drawImage(img, 0, y); does work with negative numbers! See screenshot with green square, drawn at y=-90.

Sorry, didn't do enough experimenting with the basic drawImage call, not I only need to work out why setLCDOverlay doesn't work the same.

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