Currently, if we ask the simulator to draw out-of-bounds then it will
do exactly that, it will draw outside of the "screen" and corrupt the
pixels of the watch frame that surrounds it. This is an obviously poor
simulation of the real watch and when the out-of-bounds error is only
an out-by-one error can be easily overlooked until we load the code on
the device.
Let's just throw an exception if we draw out-of-bounds. That can easily
be picked up during testing.
Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
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