Mist

Next steps

Rationals, GC and UI. Probably in that order.

Rational numbers

Pretty straightforward, they just make a bunch of graphical things easier.

GC

UI

I need a scheme for drawing to one of:

• The DOM
• A Canvas(Context).
• A <pre>, in terminal fashion.

The last is the least useful on the web, but easiest and the most Mocha86k-friendly if I'm sticking to the original intent here.

But if I want to use this for the Shadow Hunters game, which seems legit, it'll need to be implemented. It's fast enough to get the job done on a Canvas I think. I'm not animating anything, so it's all good.

Canvas design

The Smalltalk style is Morph >> drawOn: aCanvas, where Canvas has things like fillRect: aRectangle color: aColor. Those would be primitives that hand off to the CanvasRenderingContext2D.

That seems legit, and also reusable, since it decouples the Smalltalk-level UI from how things actually get rendered.

Hi DPI

This is a pain point for font rendering in Canvas generally, but it can be sidestepped by detecting the display resolution and monkey-patching the Canvas in the DOM to have a bigger native size and scaling its apparent size back down.

Since the pixel-pushing is done at the native level on the Canvas context, there's no performance implications for the Smalltalk level. There's no buffering, though, so some care is required.