Adding sugar-devel to CC in case Bert wants to say anything On Sat, Jan 9, 2010 at 16:36, Peter Gijsels <peter.gijs...@gmail.com> wrote: > Vaibhaw, > > You seem to imply that there is a (difficult) way to extract them, > could you elaborate? > > Do you think it would be useful to have a simple way to extract these > assets from a .pr file? > > I can try to see if I can come up with something. I'm not guaranteeing > anything, but I think it might be worth a shot. I think it would be > more fun than cropping screenshots. ;-) > > I have two possible approaches in mind: > 1) There is probably a central place where the .pr is being read in > and Morph objects are being constructed. If we intercept objects of > the correct type we can dump their image data to a file. The trick is > to find the code that does the deserializing which can be rather > frustrating in Smalltalk if you are not familiar with the code. > > 2) The second approach would be to just walk over all objects, see if > they are an image, and dump them to files. > > Do you have a Squeak development image (with development tools like > the browser and inspector) from which I can read in these .pr files so > that I can poke around a bit? > > Regards, > Peter > > On Sat, Jan 9, 2010 at 3:04 PM, Vaibhaw (Bob) Poddar > <vaibh...@yahoo.co.uk> wrote: >> Afraid not. There is no (easy) way to extract the info from the .pr files. I >> have been just cropping the images out from the screen shots so far. >> >> Vaibhaw (Bob) Poddar >> >> Nepal Cell. +977.98510.61345 >> India Cell. +91.99999.15661 >> US of A Cell. +1.415.508.4503 >> >> http://HimalayanTechies.com >> >> On 1/9/2010 7:43 PM, Peter Gijsels wrote: >> >> Bryan, Vaibhaw, >> >> I've got epaath working on my windows machine. >> >> Do I understand correctly that all of the materials of a lesson are >> contained in one .pr file, e.g. 6_English_actionVerb_3.018.pr? The >> epaath.image running on the squeak vm loads in that file. >> >> Is there an easy way to extract the pictures and sounds from the .pr >> file of the lesson? >> >> Regards, >> Peter >> >> On Thu, Jan 7, 2010 at 5:45 AM, Vaibhaw (Bob) Poddar >> <vaibh...@yahoo.co.uk> wrote: >> >> >> Step to get Squeak working on a Windows machine (not sure how on a Linux >> distribution). >> >> Download and install squeak >> http://www.squeakland.org/download/ >> >> Replace the etoys.image inside the Etoys/Etyos.app/Contents/Resources with >> the image file from the E-Paath. >> >> That should be it. If you run into any issues I would be happy to look at >> that. >> >> Thanks >> >> Vaibhaw (Bob) Poddar >> >> Nepal Cell. +977.98510.61345 >> India Cell. +91.99999.15661 >> US of A Cell. +1.415.508.4503 >> >> http://HimalayanTechies.com >> >> On 1/7/2010 7:44 AM, Bryan Berry wrote: >> >> here is the file http://karma.sugarlabs.org/Squeak.tar.bz2 >> >> These are all the Squeak files in the current EPaath. I am not sure how to >> actually view the individual projects. >> Vaibhaw: how do we do that? My Squeak skills are rusty >> >> On Thu, Jan 7, 2010 at 7:06 AM, Bryan Berry <br...@olenepal.org> wrote: >> >> >> hey Peter, >> first could u use pastie.org or jsbin.com for small code samples? makes it >> easier for everyone to view and comment on your code >> >> On Thu, Jan 7, 2010 at 3:47 AM, Peter Gijsels <peter.gijs...@gmail.com> >> wrote: >> >> >> Hi Bryan, >> >> I had a look at the Karma.rand() and Karma.shuffle() functions and >> have some remarks. >> >> Here is a link to some code illustrating the comments below: >> http://dl.dropbox.com/u/3249723/js-shuffle.tgz >> >> It contains the current Karma implementation of these two functions, >> an alternative implementation (AlternativeKarma) and some code to >> print some histograms. >> >> 1) The values returned by Karma.rand(min, max) are not uniform: the >> probability of getting min is half of any other element between min >> and max. The same goes for max. If you use Math.floor i.s.o. >> Math.round (and adjust the argument to Math.random) you have a uniform >> distribution. >> >> >> Good point! Let's use your code >> do you have any idea how we could write a unit test to check that values >> aren't uniform? That way I don't change it back to a crappy implementation >> by accident later >> >> >> >> 2) The Karma.shuffle(array) function does not return each permutation >> with equal probability. If you work through the math for a three >> element array you can derive this. Or you can simply make a histogram >> ;-) In the code linked above I make a histogram and you can see that >> not every permutation is equally probable. The alternative >> implementation uses the Fisher-Yates algorithm, and does not have this >> problem. >> >> >> >> >> 3) The unit test for Karma.shuffle is not deterministic: it will fail >> with a probability 5/5! = 1/24. I do not know of a good way to test >> these kind of functions. You could do something like the histogram >> thing in the code above and check that the distribution is roughly >> uniform. But then the test is still not deterministic and if you want >> a small chance of failure, running the test would take a bit of time. >> Maybe one thing that you should check is that the result of calling >> shuffle() contains the same elements as the original (sort both and >> see that they have the same elements in the same position). >> >> >> Ouch, you can tell that my CS fundamentals are pretty weak ;) >> I think that shuffling only 5 elements isn't really a valid test, better >> to shuffle 25 elements and see if it fails out of 100 tests. I think 1/500 >> is a tolerable failure rate, what do u think? >> let me test that out now >> >> >> On an unrelated note, did you have time to prepare a download link >> with the Squeak stuff? Tomorrow evening I have some time to have a >> look at it. >> >> Regards, >> Peter >> >> >> Sorry I uploaded most of the files but forget to upload one important >> file, the squeak image ;). I will upload that now and send you the link >> shortly >> >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com >> Version: 9.0.725 / Virus Database: 270.14.127/2603 - Release Date: 01/06/10 >> 13:20:00 >> >> >> >>> >> >> >> No virus found in this incoming message. >> Checked by AVG - www.avg.com >> >> Version: 8.5.432 / Virus Database: 270.14.131/2609 - Release Date: 01/09/10 >> 07:35:00 >> >> >
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