Beginners January 2012

beginners@lists.squeakfoundation.org

22 participants
17 discussions

Is there an easy way to implement an animation loop?
by Jan Teske 06 Jan '12

06 Jan '12

Hi there, I try to implement a blocking animation so that the process waits for the animation to be terminated before going ahead. This animation should lower the extent of a Morph in 20 iterations so that it looks like it would shrink. I tried to accomplish that in a '1 to: 20 do:' loop but the Morph is not updated during the iterations. I tried 'morph changed' but that doesn't work either. It does work, however, if I fork the animation loop. But than I have an extra process an need Semaphores to wait for its execution. That's not as simple as it could be. Is there any better way than fork and Semaphore? Maybe some force redraw method I have overlooked? Thanks in advance!

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OpenGL integerated wtih Squeak IDE
by Lawson English 06 Jan '12

06 Jan '12

This is a very poor attempt to do what Matt Fulmer did with OpenCobalt: integrate overlapping Morphic windows with OpenGL. The only advantage is that it doesn't require OpenCobalt. https://www.youtube.com/watch?v=Ctm-Q39nd-k The entire World is being rendered onto an OpenGL texture which is updated with every tick. With the proper scaling , the destop could be repositioned along the z access at any point within the fustrum and still keep the default mouse handling. Add mouse handling from OpenGL itself, and you can have 2D widgets projected onto 3D objects, not to mention 3D widgets fully integrated with the Squeak desktop. Time to revive/revitalize Balloon3D, perhaps? Whatever happened to 3D Morphic? There's obviously a great deal of room for optimization, and of course, the sky is the limit for what could be done in terms of lighting, materials, etc. Using more modern APIs of OpenGL (I'm using immediate mode! (!) and only stuff from the first 6 NeHe tutorials) one could have an awful lot of interesting stuff going on. Lawson

2 1

Enumeration type implementation
by Ben Coman 06 Jan '12

06 Jan '12

(Resending since it didn't show up on the list overnight) What is the best way to implement "enumerations" in Smalltalk. For instance, for a UML definition of... <<enumeration>> Currency <<enum>> USD 'US dollar' <<enum>> EUR 'Eueropean euro' <<enum>> AUD 'Australian dollar' here is my guess, consisting of 2 instance side methods and 3 class side methods... ------------------------- Object subclass: #EpcimCurrency instanceVariableNames: 'value' classVariableNames: '' poolDictionaries: '' category: 'IEC61970-Domain-Enumerations' EpcimCurrency >> value: aCurrency ( (self class) validate: aCurrency) ifTrue: [ value := aCurrency ]. EpcimCurrency >> value ^value ----------------------------------- EpcimCurrency class instanceVariableNames: 'enums' EpcimCurrency class >> validate: aString enums ifNil: [ self initialize ]. ^ enums includesKey: aString. EpcimCurrency class >> enums "for displaying in pulldown menus" enums ifNil: [ self initialize ]. ^enums copy EpcimCurrency class >> initalize (enums := Dictionary new) add: 'USD'-> 'US dollar' ; add: 'EUR'-> 'European euro' ; add: 'AUD'-> 'Australian dollar' ; add: 'CAD'-> 'Canadian dollar' ; add: 'CHF'-> 'Swiss francs' ; add: 'CNY'-> 'Chinese yuan renminbi' ; add: 'DKK'-> 'Danish crown' ; add: 'GBP'-> 'British pound' ; add: 'JPY'-> 'Japanese yen' ; add: 'NOK'-> 'Norwegian crown' ; add: 'RUR'-> 'Russian ruble' ; add: 'SEK'-> 'Swedish crown' ; add: 'INR'-> 'India rupees' ; add: 'other'-> 'Another type of currency' . ---------------------- Examples " (EpcimCurrency new value: 'AUD' ) value inspect " ----> 'AUD' " (EpcimCurrency new value: 'XXX') value inspect " ----> nil " EpcimCurrency initialize " " EpcimCurrency enums inspect " ---> aDictionary ------ The other way I thought might be like `Color blue`, but I'm not sure what is gained. Your feedback would be appreciated.

4 5

Changing the extent of an ImageMorph
by Jan Teske 05 Jan '12

05 Jan '12

Hey, I'm currently developing a small game with Squeak. Part of it is a bunch of menus which should have background images. Therefore I have realized them as ImageMorphs with the respective images. Now, there are menus which sizes are determined dynamically during the runtime of the game. That means I have to change the size of the menus. Since I cannot do this by manipulating 'menu extent: ...' directly, the only way I found until now is to manipulate the image form 'menu image: menu image scaledToSize: ...'. That works pretty well except for one thing: I cannot change the aspect ration of the original image with scaledToSize:. Since I do not know the extends of my menus before the game starts, I cannot say anything about the needed image ratio. Since my menus should be as applicable as possible I need to be able to resize also in a way which destroys the original scales. Is there any easy workaround for my problem or a recommended way for creating resizable Morphs with background images? Thanks in advance!

4 4

Class of method
by Garret Raziel 04 Jan '12

04 Jan '12

Hi, I have read that method of object is object itself. So my question is, how can I send message to that object? Is there for example possibilty to send message to the method to decompile itself and show its code? What is method subclass of? Jan

2 1

ROS (Robot Operating System)
by Overcomer Man 04 Jan '12

04 Jan '12

Recent posts on time measurement led to thinking the Willow Garage ROS project could be translated to Squeak / Cuis. Here's the website http://www.ros.org/wiki/ Anyone interested in collaborating? I'm for using Cuis with the latest VM.

1 0

Enumeration "type" implementation
by Ben Coman 03 Jan '12

03 Jan '12

What is the best way to implement "enumerations" in Smalltalk. For instance, for a UML definition of... <<enumeration>> Currency <<enum>> USD 'US dollar' <<enum>> EUR 'Eueropean euro' <<enum>> AUD 'Australian dollar' here is my guess, consisting of 2 instance side methods and 3 class side methods... ------------------------- Object subclass: #EpcimCurrency instanceVariableNames: 'value' classVariableNames: '' poolDictionaries: '' category: 'IEC61970-Domain-Enumerations' EpcimCurrency >> value: aCurrency ( (self class) validate: aCurrency) ifTrue: [ value := aCurrency ]. EpcimCurrency >> value ^value ----------------------------------- EpcimCurrency class instanceVariableNames: 'enums' EpcimCurrency class >> validate: aString enums ifNil: [ self initialize ]. ^ enums includesKey: aString. EpcimCurrency class >> enums "for displaying in pulldown menus" enums ifNil: [ self initialize ]. ^enums copy EpcimCurrency class >> initalize (enums := Dictionary new) add: 'USD'-> 'US dollar' ; add: 'EUR'-> 'European euro' ; add: 'AUD'-> 'Australian dollar' ; add: 'CAD'-> 'Canadian dollar' ; add: 'CHF'-> 'Swiss francs' ; add: 'CNY'-> 'Chinese yuan renminbi' ; add: 'DKK'-> 'Danish crown' ; add: 'GBP'-> 'British pound' ; add: 'JPY'-> 'Japanese yen' ; add: 'NOK'-> 'Norwegian crown' ; add: 'RUR'-> 'Russian ruble' ; add: 'SEK'-> 'Swedish crown' ; add: 'INR'-> 'India rupees' ; add: 'other'-> 'Another type of currency' . ---------------------- " (EpcimCurrency new value: 'AUD' ) value inspect " ----> 'AUD' " (EpcimCurrency new value: 'XXX') value inspect " ----> nil " EpcimCurrency initialize " " EpcimCurrency enums inspect " ---> aDictionary Any suggestions

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Beginners January 2012