On 21.04.2012, at 13:25, David Graham wrote: > On 4/21/12 2:16 PM, Bert Freudenberg wrote: >> On 20.04.2012, at 22:14, David Graham wrote: >> >>> It took me almost 20 years, but I finally thought of something interesting >>> to put on the Internet. ;) >>> >>> I've been experimenting with a BeagleBone (embedded ARM V7 platform) and >>> was able to get Squeak 4.2 running without a problem. I put together a >>> simple demo with a blog post and video, and thought the Squeak list may be >>> interested (also, please let me know if I have any technical errors in my >>> smalltalk code explanation). >>> >>> http://blog.unthinkable.org/ >>> >>> -David >> Very nice! >> >> There is one flaw in your code. You should never run Morphic code outside >> the UI process. But your "appendValue:" message does that. The correct way >> would be to write >> >> WorldState addDeferredUIMessage: [graph1 appendValue: lightValue] >> >> That will cause the block to be evaluated at the next display cycle. >> >> Of course, the proper way to make an updating Morph is to write a new Morph >> class. Then you could use Morphic's stepping mechanism to read the data and >> display it. > > Thanks Bert! I just started playing with Morphic and didn't know this. ( > also, I just started learning smalltalk last year and mostly working with > Zinc on Pharo). I was targeting my post at non-smalltalk arduino / > BeagleBone devs and wanted to keep the syntax as simple as possible, but > should I update the post?
Well, people learn from examples, and it's better if the examples do not teach bad style. Here is a way to use Morphic's stepping properly from a workspace. This uses the Etoys mechanism of adding methods to an object directly (without having to make a new class in the browser): graph1 := GraphMorph new. graph1 assureUniClass. graph1 class compile: 'step self appendValue: 50 atRandom. super step'. graph1 class compile: 'stepTime ^50'. graph1 openInWorld. graph1 extent: 700@500. graph1 clear. This avoids having to create a background process, but I'm not sure if that makes it more clear to your audience. - Bert - >> But for a 10 line hack your code is not bad :) > I hear this a lot. ;) > > _______________________________________________ > Beginners mailing list > Beginners@lists.squeakfoundation.org > http://lists.squeakfoundation.org/mailman/listinfo/beginners _______________________________________________ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners