line cap and dimensions bindings

[Fresheyeball]

No description provided.

[paf31]

This instance doesn't follow the "implicit contract" of Show that show x should evaluate to x in the REPL. Can we split this into a Show instance and another function to render a LineCap for use in setLineCap?

[Fresheyeball]

Im sorry, but i do not understand this comment.

[paf31]

So, if you show something, you should be able to take the string and paste it into the REPL, and it should work, but round, for example does not evaluate to Round. This should be

show Round = "Round"

etc. with another function used to turn LineCaps into Strings for passing to the setLineCapImpl function.

Either that or make LineCap into a newtype around String.

[paf31]

Looks good, I just put a few comments in the code.

[garyb]

Do the various get functions need the effect, aside from getContext2D they're pure aren't they?

[Fresheyeball]

The dimensions of the canvas are mutable. So if readSTRef needs an effect, then I feel this does too.

[paf31]

👍 Thanks!