Re: Core Data with OpenGL
Re: Core Data with OpenGL
- Subject: Re: Core Data with OpenGL
- From: "I. Savant" <email@hidden>
- Date: Mon, 12 Oct 2009 16:54:10 -0400
On Oct 12, 2009, at 4:27 PM, Ben Trumbull wrote:
but in this case it must draw itself.
No, it doesn't must do anything. Views draw themselves, model
objects are state, and controllers are intermediaries.
...
What problem are you trying to solve by knowingly violating the MVC
design patterns ?
Hmmm ... must draw itself? No, from a pure MVC approach, I agree
with you 100% that not only does it not "must" but it "shouldn't".
However, it's only fair to point out theSketch example - the
quintessential example for drawing applications. The STKGraphic class
has draw...InView: methods.
For a drawing app, I can see why it might be considered a cleaner
design, despite "knowingly violating the MVC design patterns". A
"Shape" knows how - and where - to draw itself - just give it a view.
I think it's mostly a matter of personal taste and methodology but it
certainly isn't "wrong", which I suppose is why it's now one of the
few examples left in the developer examples folder in Snow Leopard.
In theory this violates MVC, but in practice this design approach
is much easier to understand and maintain (in my opinion, anyway) for
a drawing application like Sketch.
This isn't meant to contradict your overall advice, but I do think
an application's architecture doesn't have to *rigidly* adhere to any
one design pattern to be "good".
--
I.S.
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