Squeak-dev June 2001

squeak-dev@lists.squeakfoundation.org

122 participants
362 discussions

Re: Image Morphs
by Bob Arning 29 Jun '01

29 Jun '01

Joshua, ImageMorph responds to #image (and #form) with the Form containing all the bits in the image. Once you have that form, you can access the pixels with #colorAt:, e.g. If counting the number of each different color is important, you might look at Form>>tallyPixelValues. Cheers, Bob On Fri, 29 Jun 2001 09:18:24 -0400 (EDT) "Joshua D. Boyd" <jdboyd(a)cs.millersville.edu> wrote: >I've been poking around the systems browser, and I've figured out how to >load a jpeg into an ImageMorph. But, how to I get access to that jpeg, >pixel by pixel (like to built a histogram of the image, for instance), and >write it back to disk? Or is the ImageMorph the wrong way to go about >this?

1 0

Re: Philosophical questions about collections
by Bob Arning 29 Jun '01

29 Jun '01

Diego, On Fri, 29 Jun 2001 09:51:00 -0300 Diego Gomez Deck <DiegoGomezDeck(a)ConsultAr.com> wrote: >I can't find the correct way to think about #= message for collections... You are not alone in this feeling. ;-) >For example, Dictionary use Set>>= that ignores keys. > >Bag, has not implemented the message. > >All the SequenceableCollection family seems to be good (IMHO). > >There exists a message that compares the elements of a collection with >another ignoring the collection species? I don't think so, but you could do something like collection1 asSet = collection2 asSet or collection1 asArray = collection2 asArray The fact that these two options could easily produce different results suggests that there may be more than one way to think about collection equality. My inclination would be to write a method that did what I wanted in a particular situation and try to make it clear whether the order of the elements was important or not and whether duplicate elements should affect the result. Other factors, such as the precise way of comparing elements, may also be important. Cheers, Bob

1 0

Re: BankAccount Tutorial
by Bob Arning 29 Jun '01

29 Jun '01

Here is one of the previous messages on this subject: On Tue, 12 Jun 2001 02:49:36 +0200 (CEST) Edmund Ronald <eronald(a)rome.polytechnique.fr> wrote: >Hmmm, now it works but it ain't pretty sez the newbie. So he changes the >bar width, and adds a little bit of data, and ventures to suggest these >changes be written back into the excellent tutorial . > >Edmund. > >historyMorph > "displays barchart, width 30 per bar" > | bars m | > bars _ history collect: [:v | Morph new extent: 30@v]. > m _ AlignmentMorph newRow > hResizing: #shrinkWrap; > vResizing: #shrinkWrap; > cellPositioning: #bottomRight. > m addAllMorphs: bars. > ^ m > >"in the workspace, add some example data" >b initialize; deposit:100; withdraw:20; deposit:30; withdraw:20; deposit:30; > withdraw:20; deposit:30. > >"show it" >b historyMorph openInWorld.

1 0

Re: New VM for Linux?
by Bob Arning 29 Jun '01

29 Jun '01

Christopher, There are several possibilities for what I think you want to do. - If you are interested in kids publishing their projects and later being able to load them back, you could just use a normal Squeak image and a shared file server with directories for each student or each class. Navigation would be by either the blue publish/find dialogs or the plain old file list. - You could do something like BSS running locally. The code is available if you're up to a little hacking around or you can wait until it becomes part of the normal ComSwiki distribution. - If you want something just like squeakland.org, Andreas or Michael could tell you more about how that works. Cheers, Bob On Fri, 29 Jun 2001 19:53:54 +1200 Christopher Sawtell <csawtell(a)xtra.co.nz> wrote: >I am hoping to be able to interest Caleb's school in the whole Squeak / >EToy thing, but as >we are here in NZ and Internet traffic is not without cost, I expect >that I will have to set up a local mirror of Squeakland.org. > >Could we do that please? Are there any special modules for the server or >is a "standard" Apache all right?

1 0

Re: Icons
by Bob Arning 29 Jun '01

29 Jun '01

Ross, On Fri, 29 Jun 2001 01:12:09 -0700 Ross Boylan <RossBoylan(a)stanfordalumni.org> wrote: >If I want to make a little icon, what's the best way to do it? Can it be >done with the internal painting tool? There are several possible ways: 1. Use the normal painting tool (the paintbrush on the navigator or "make a new drawing" from the new morph menu). When you "keep" the painting, you will have a SketchMorph which you can inspect or explore to get to the Form that you just painted. From the explorer or inspector, write a simple bit of code to put that Form somewhere (like ScriptingSystem or elsewhere) for future use. Or you can print "self storeString" when inspecting the form to get actual code you can put in a method. 2. Use the fat bits tool as Karl suggests. Do something like (Form extent: 32@32 depth: 16) bitEdit There are lots of useful tools in the red halo menu. When you are done, use "inspect" from this menu to get at the Form and use one of the techniques from above to save it for posterity. 3. Sometimes it seems easier (at least to geeks like me) to create it programmatically. Here is a stop button for a vcr controller widget: makeStopButton | f aButton | f _ Form extent: 24@15 depth: 32. f fillColor: Color gray. f fill: (f boundingBox center - (4@4) extent: (8@8)) rule: Form over fillColor: Color white. aButton _ IconicButton new borderWidth: 0; labelGraphic: f; color: Color gray; actWhen: #buttonUp; useRoundedCorners. ^aButton Advantages: #1 makes for easy painting, but is sometimes difficult to do precise work in smaller sizes. Also, if an exact image size is important, this is extra work. #2 allows for fine control at the pixel level, but it's tougher to do larger objects like circles, etc. #3 requires some coding expertise, but can produce very precise images when they can be described in terms of lines, rectangles, etc. An additional technique to use here is to draw the thing at 2x or 4x initially and then reduce the final image using WarpBlt. This will anti-alias the edges and can produce a nice clean image in small sizes. >I have a hazy recollection of seeing a recommendation to use an external >paint program and then importing the result (into one of the image or >button morphs?). You can certainly do that. Squeak can read GIF, JPG, BMP, PNG and perhaps others I have forgotten. Once you have it in Squeak, techniques like those above can copy all or part of the image for use in your UI. >While poking around I found the forms dictionary in Scripting System. Can >anyone tell me if the code that populates it is in the system, or are we >left only with the artifact? (I found some code for a few items, but not >most). I think the general practice is to include the code that adds things to ScriptingSystem as a postscript to a changeset. That way the code does not need to be kept in the system forever (it would essentially be a duplicate in terms of space). Cheers, Bob

1 0

Re: New VMs
by Henrik Gedenryd 29 Jun '01

29 Jun '01

Giovanni Giorgi wrote: > Excuse me, I am new to Mac Os X. > Can I use the carbon VM on Mac Os X? > Thank you! Yes, that is precisely the point of Carbon. It works well, with just a known glitch when switching apps in full-screen mode. Henrik

5 6

Re: [BUG] SyntaxMorph testClass:andMethod:
by Bob Arning 29 Jun '01

29 Jun '01

Steve, First, it is possible (although certainly not ideal) to resize the scriptor you get in this fashion. If you move the scriptor a bit away from the top left corner, then cmd-click just to the left of the blue square that is visible inside the scriptor, you will get the halo. Click until the label on the halo is "TwoWayScrollPane", then drag the yellow handle and the scriptor will resize. Second, there is a newer way to do this that you may find more useful - from the menu icon at the top of the browser, turn ON the "tiles" option. Then you will see the tiles right in the browser. Third, I'm not clear on which method it is that you think is confusing and nasty. Cheers, Bob On Thu, 28 Jun 2001 21:47:28 -0800 Steve Wart <thecows(a)home.com> wrote: >If you click on a method in a browser and select 'tile scriptor' the >SyntaxMorph comes up in a little window in the upper left hand corner of >the screen. Can't resize, pretty confusing. > >If you revert to the 3.0 version of this method, everything is fine. In >fact the 3.0 version of the method is much simpler. It is sending >#openInWindow to the SyntaxMorph whereas the 3.1 version creates an >AlignmentMorph and sends it #openInWorld. > >The 3.1 version of the method is quite confusing and nasty (IMHO), in >addition to the fact that it doesn't seem to work correctly. I would >suggest that the first version is 'right', or at least that some >refactoring is in order.

1 0

Re: Cassowary Demo Question
by Joshua 'Schwa' Gargus 29 Jun '01

29 Jun '01

A small correction... On Fri, Jun 29, 2001 at 07:59:26AM -0400, Joshua 'Schwa' Gargus wrote: > Hi Ross, > > On Fri, Jun 29, 2001 at 01:35:06AM -0700, Ross Boylan wrote: > > I hate to be dense, but what do the demos do? > > The demos are broken. Apparently, the demo morphs are not well-behaved > morphs. When they are stored into a project, they don't properly store > their Cassowary solver state. I'm looking into this right now... Actually, they don't copy the solver state even when you duplicate a properly-functioning demo morph. I'll let you know when it's fixed. Joshua <snip>

1 0

Handling big morphs
by Ross Boylan 29 Jun '01

29 Jun '01

I have some items to display that will take up too much real estate. What are the standard ways to handle this? I'm thinking of solutions like * window or morph with scrollbars * no scrollbars, but item relocates as you move the mouse (maybe it moves the point where the mouse is to the center?). Then there are more application specific tricks I might do, like having parts popup with greater detail under some conditions, and then be swallowed when I move focus away. But I'm really only looking for appropriate class and usage pattern for the vanilla patterns. Also, if anyone has any wisdom about good metaphors, I'd love to hear it. Background: I'm working on a priorities planning tool. (Even though it probably shouldn't be a priority for me!) One of the things I'm doing is classifying tasks in various ways, such as the part of my life they deal with and the kind of interaction they involve (e.g., people or machines). Each of these sets of spheres is (conceptually) a hierarchical tree, with more detailed divisions as you go down. But the trees get kind of large. That's my last question for the night!

2 1

Instance-based Programming
by Steve Wart 29 Jun '01

29 Jun '01

I would like to create a simple UI in Squeak. Say (for example) a nice little dialog for filtering messages in Celeste. It seems like I should be able to paint a window with fields and buttons, etc., and script it up using the Viewer. When I do this, do I need to create a class to hang onto these methods? What are the issues with just keeping the instance around and giving it a global name? It seems easier to create an E-toy, give it a name, and then activate that E-toy from within a regular button. I don't really like the idea of a large number of globally scoped instances, but it's probably not practically any different than having a large number of globally scoped classes. Will this cause problems, for example, with change sets? Can I browse versions on scripts they way I can with methods on classes? Adding this would be nice. I found that I have a tendency to obliterate big chunks of methods using the SyntaxMorph, and versioning is like a rich person's undo :-) Cheers, Steve

1 0

← Newer
1
2
3
4
5
6
7
8
9
...
37
Older →

Jump to page: