Thanks, Rymf – I’m having a blast with this!
Here is the patch for November 11, 2011.
When you create a surface for drawing (using the separate MGraphics instance we saw last time), you don’t have to make an opaque surface – it can be alpha channel reduced, allowing us to make semi-transparent figures that can be reused. In this case, I make a Big Red Square, scale the user space when drawing it, then draw a blue circle over the top. Everything is half-alpha’d, so you get a little see-thru no matter what happens.
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