Beginners December 2011

beginners@lists.squeakfoundation.org

27 participants
17 discussions

Re: Create own Morph
by SonGuko 31 Dec '11

31 Dec '11

hey, so i answer myself for others: step 1: drag your image in squeak step 2: explore the created morph step 3: go to the bitmap part of the morph and highlight it step 4: print: self compressToByteArray step 5: to create a new morph with the picture: ColorForm extent: (insert your imagesize) depth: (insert your depth of the image) bits: (Bitmap decompressFromByteArray: #(insert your compressedToByteArray)) asMorph step 6: profit :) -- View this message in context: http://forum.world.st/Create-own-Morph-tp4088419p4248489.html Sent from the Squeak - Beginners mailing list archive at Nabble.com.

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Sending messages
by James O'Brien 31 Dec '11

31 Dec '11

I would like to use a SimpleButtonMorph that, when clicked on, will cause some text to appear in a TextMorph. Any suggestions on how to do this?

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problems moving and resizing quadrangles
by Alan Gauld 30 Dec '11

30 Dec '11

In my tutorial I've been building a quadrangle editor. The idea is that there are two menuus. One appears if I click on the background, the other if I click inside a quadrangle. In the quad menu I have options to move, resize, set color and delete the quadrangle that is being clicked. It all works ok except for the resize and move options. Here is the menu building code that holds the critical blocks. What I'm trying to do in both cases is create a new quadrangle from the original and replace the original in the OrderedCollection which is the super class for the editor. edit "edit a quadrangle" | menu cmdMenu quadMenu finished point actions quadActions cmdActions select qd | quadMenu := PopUpMenu labels: 'move resize set to red delete' lines: #(3 ). quadActions := Array new: 4. quadActions at: 1 put: [:q | self at: (self whichIndex: q) put: (q translateBy: Point fromUser)]. quadActions at: 2 put: [:q | self at: (self whichIndex: q) put: (q scaleBy: Point fromUser)]. quadActions at: 3 put: [:q | q insideColor: Color red]. quadActions at: 4 put: [:q | super removeAt: (self whichIndex: q)]. whichIndex is a new method I added to the editor, and it seems to work since the remove menu action works OK. It looks like: whichIndex: aQuad "returns index containing aQuad or nil" 1 to: lastIndex do: [:i | (self at: i) == aQuad ifTrue: [^ i]]. ^ nil I assume I'm misunderstanding how translateBy and scaleBy work, or something? But I'm stuck. Any clues or pointers welcomed! -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/

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More squeak tutorials: simple algorithm visualization tool
by Lawson English 30 Dec '11

30 Dec '11

I'm working on a tool to visualize simple algorithms and data structures for my tutorials http://www.youtube.com/watch?v=O8mimAy5_es&list=PL6601A198DF14788D&index=48… http://www.youtube.com/watch?v=QAA0mGRAQwY&list=PL6601A198DF14788D&index=49… Currently, it only supports display of Array>>at: #at:put: #wrapAt: #wrapAt:put: in the near term, I'm working on the display of operations on the the elementary data structures like linked lists, trees, etc, with the elementary algorithms for sorting/searching/insert/delete/etc. I'm refactoring as I go. The second iteration still needs much work even within the context of Array methods. Suggestions/comments/criticisms welcome, thanks. Lawson

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Squeak 3.9 differences from Smalltalk80?
by Alan Gauld 28 Dec '11

28 Dec '11

I'm working through a fairly ancient intro to Smalltalk-80 called "Smalltalk-80 A Practical Introduction" by Philip Gray. A lot of the methods that Gray uses don't exist in quite the same form in my Squeak (3.9 under Ubunto 10)(*). I can generally figure it out eventually by studying the browser, but I understood Squeak started out as a clone of the original ST-80? So I wondered where/when the differences came in. And also if there is a crib sheet of what the differences are? (Which would save me some time!) BTW I've also been using SBE but I wanted to try the examples in the Gray book just for fun... (*)An example is in PopUpMenu where Gray uses a "reset" message which doesn't seem to exist in Squeak. He also uses a "startUpWithHeading:" which is "startUpWithCaption:" in Squeak. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/

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More squeak tutorials... textures in OpenGL
by Lawson English 24 Dec '11

24 Dec '11

Based off of NeHe OpenGL Tutorial #6 concerning basic textures. It doesn't [yet] show how to use mipmaps, but it does show how to use a screengrab form... http://www.youtube.com/watch?v=nugGZEAj4aQ&list=PL6601A198DF14788D Lawson

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Iterating backwards through a Matrix
by Jan Teske 22 Dec '11

22 Dec '11

I'm currently trying to develop a game with squeak. The game field is based on a Matrix in which all the game objects are placed. To simulate gravity I need the possibility to iterate over the Matrix in a reversed order. For example if my Matrix looks like that: 1 x x 2 x 3 x x 4 x x 5 I need to bring that into a Collection like {5. 4. 3. 2. 1} which allows me to perform iterations (select) over this reversed order. It would also be okay if the order was like {4. 5. 3. 1. 2} since I only need the elements in the lower rows to come before the elements in the upper rows. I already tried 'myMatrix toArray reverse' but the toArray seems to mess up the whole order so that is not working. Maybe I could iterate through the Matrix on my own and build an Array out of that. But since I feel I might have overlookes something I wanted to ask for a better way first. Is there any? Thanks in advance!

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Implementing a simple timer
by Jan Teske 21 Dec '11

21 Dec '11

I'm trying to write a simple timer using a TextMorph and its step method. It should count up every 1 second so I've set stepTime to 1000. My step method looks as follows: step self time: self time + 1. self contents: self time asString That should work. But I discover one problem: The timer counts up but it does so way to fast. If I print the numbers onto the Transcript everything works fine. So I think the problem lies within the TextMorph. It seems that during the sent of 'self contents:' the step method is called again so that it is executed long before the stepTime is up. Am I right with that suspicion? Can anyone think of a way to work around my problem? Thanks in advance!

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[ANN] Koans for Teaching the Basics of Smalltalk
by Michael Perscheid 15 Dec '11

15 Dec '11

Hi all, it's a pleasure for me to announce the Koans tutorial project for teaching beginners the basics of Smalltalk. Inspired by the Edgecase Ruby Koans project and the original "The little Lisper" book by Daniel P. Friedman and Matthias Felleisen, we have implemented Smalltalk Koans in order to help our students to get started with Smalltalk. Smalltalk Koans will guide you as a Smalltalk novice from first steps in Smalltalk to your first small project. The path is simple: You get a task, you solve it and, in the process, learn something. The Koans Sensei (jap.: teacher) will be your guide and introduce you to fundamental concepts in Smalltalk such as strings, blocks, collections and many more. After a first internal use, we'd like to announce that we make this tutorial project available for the community. https://www.hpi.uni-potsdam.de/hirschfeld/trac/SqueakCommunityProjects/wiki… Especially, we'd like to acknowledge our student assistants, Eric Seckler, Robin Schreiber, and Partick Rein for implementing Koans in Smalltalk. If you have any wishes for new lectures and feedback to existing ones, please let us know. Best regards, Michael

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Blender 3D
by chsmith＠xmission.com 14 Dec '11

14 Dec '11

Thank you great Squeakers, We are starting a different school that runs by having the students create what they use and consume. We are looking at Brazil and India as our first pilot sites. Working with those who other wise do not get access. We have a good group of young poeple that are working with us with the idea that we can change to world by building: brains with board games; brawn with laser tag: material and mental wealth with robotics. We are not looking to prep these students to work for someone else. They will continue to work for themselves with new sources of energy and local materials. There have been several operations that have operated for over 30 year with this model. The bare foot college is one. We are using the advancement in energy to take it to the next level which will bring us to an opportunity for learning programing. we have millions to work with since more than 4 billion people still live on less than a $1000 a year. Will keep you posted. Chuck Smith

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Beginners December 2011