var baseOne = 2 * math.sin(math.Pi * 54 / 180) var baseTwo = 2 * math.sin(math.Pi * 18 / 180) def triangleOne(depth: Int, length: Double, mirrored: Int): Unit = { if(depth == 0) { setFillColor(cm.green) forward(length) right(mirrored * 72) forward(length) right(mirrored * 144) hop(length * baseOne) right(mirrored * 144) } else { right(mirrored * 36) hop(length) left(mirrored * 144) triangleOne(depth - 1, length / baseOne, -mirrored) hop(length / baseOne) right(180) triangleTwo(depth - 1, length / baseOne, -mirrored) hop(length / baseOne) right(-mirrored * 36) hop(length / baseOne) right(180) triangleOne(depth - 1, length / baseOne, mirrored) hop(length * baseOne) right(mirrored * 144) } } def triangleTwo(depth: Int, length: Double, mirrored: Int): Unit = { if(depth == 0) { setFillColor(cm.blue) forward(length) right(mirrored * 144) forward(length) right(mirrored * 108) hop(length * baseTwo) right(mirrored * 108) } else { hop(length * baseTwo * baseTwo) right(mirrored * 108) triangleTwo(depth - 1, length * baseTwo, mirrored) hop(length * baseTwo) right(mirrored * 180) triangleOne(depth - 1, length * baseTwo, mirrored) left(mirrored * 36) hop(length * baseTwo) right(mirrored * 108) } } def decagon(depth: Int, length: Double) { clear() setBackground(cm.black) setSpeed(superFast) invisible() setPenColor(cm.black) left(90) hop(length) right(180) repeat(5) { triangleTwo(depth, length, 1) triangleTwo(depth, length, -1) right(72) hop(length * baseTwo) left(36) hop(length * baseTwo) left(108) } } clear() toggleFullScreenCanvas() var depth = 0 repeat(7) { decagon(depth, 400) depth = depth + 1 Thread.sleep(3000) }

My compliments to the Kojo devs for creating an environment that makes it surprisingly easy to do things like this…

In today's age, lots of us believe there is nothing else but contemporary technology that may ensure the general evolution of the youngsters, but it is not at all true. A drawing item called the Coloring pages may also ensure the evolution of the kids and that too quite easily.

As an adult, there are a lot of anxieties and thoughts in the brain of an individual. There are many and could have a negative effect on your own life. The coloring pages make out the child in an adult, and it helps in creating the things as favorable. With positive thinking, unwanted ideas are taken from the mind of an adult.

Child development is composed of developmental stages or milestones. Among the most crucial developmental activities is to form a personality which means to be stable and prepared to handle the challenges. While kid is engaging coloring activity he or she is concentrated and relaxed. This gives a child a chance to calm the mind, put aside all the burdening thoughts and make some space for pleasant emotions. If a child uses coloring pages frequently, this coloring task can become a self - soothing technique which is quite essential for challenging situations. Among other approaches coloring books are fun and imaginative way yourself comforting.

While coloring in the pages, the grasp of these children will be improved on the writing tool. There should be a holding of the tool in their children's hands. There will be routine practice through the kids before going to school. It will improve the strength of the hand and enhances their children's focus. There ought to be an involvement of habits among preschoolers.

It's perfect for your kids to make them engage in coloring sheets for creating them understand about the leaning. It is possible to create them color different alphabets and pictures of things and creatures; this is going to enable them to get familiarized with things that are unique in a simpler way. Making children learn about various things is necessary as they might fall short in studying. Coloring sheets can come to create them learn about items in a way that is lively.

Every person has a fixed sequence or colors set in his thoughts; it will create the feeling of creating his own sort of color arrangement. Thus, the child will certainly get to learn concerning the color schemes used in a variety of items such as the amount of colors in the rainbow and others.

PS: Would like to quote stackoverflow survey One out of every 200 is hard of sight.

Please let me know if this is something that interests you.

I see that the interface is translated in Italian but the exaples not.

I'm using kojo 2.4.12 for Linux - and have access to a not blleding edge computer.

TIA and Regards

Carlo D.

import java.awt.Graphics import java.awt.image.BufferedImage import javax.swing.JComponent import javax.swing.JFrame val frame: JFrame = new JFrame("Fractal") frame.setSize(640,320) frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE) frame.setVisible(true)

Results in:

Error[9,39]: value DISPOSE_ON_CLOSE is not a member of object javax.swing.JFrame

I realise Kojo isn't necessarily meant to be used in this way, but for my better understanding, I am curious why DISPOSE_ON_CLOSE doesn't show up!

Following "Expressions" section under the Scala tutorial, which is under Kojo's Help menu and ran the expression 3.5*9.4+7/5, which returned 33.9, I've repeated tried this expression using both Windows 7 calculator and Google search and the number I am getting from them is 34.3, which means either Kojo has a problem or the world as a problem. I have also tried just running it like this: println((3.5*9.4)+(7/5)), but again the result Kojo returns is 33.9. Perhaps I do not understand how the "order of operation" Kojo is performing, but I've tried it several ways got different results of course, but never got 33.9. Please look into this issue and let me know whether I am not understanding something or if there is a bug in Kojo. I really think Kojo is a great system overall, but if it's a calculation bug then it needs to be address. Thanks and have a great day!

On the console, I see this:

./kojo
Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar
[INFO] Running first Kojo instance with args: []
[INFO] Java Home: /opt/jre1.8.0_45
Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=32m; support was removed in 8.0
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0
[INFO] Logging has been redirected to: /home/daddy/.kojo/lite/log/kojo0.log

Exception: java.lang.NullPointerException thrown from the UncaughtExceptionHandler in thread "AWT-EventQueue-0"

The above is for the Oracle JRE for Java 8, but there are only slight variations with other versions. The NPE at the bottom appears in all cases, and I suspect that it's at the root of the problem.

In the log, I see only a listing of the system properties, followed by this, which mirrors what I saw in the console:

[Sat Jul 11 22:33:53 EDT 2015, CodeExecutionSupport] SEVERE: stderr> Exception in thread "AWT-EventQueue-0"
[Sat Jul 11 22:33:53 EDT 2015, CodeExecutionSupport] SEVERE: stderr> Exception in thread "AWT-EventQueue-0"

Since there is no stack trace attached to the exception, I can't even venture a guess as to what the problem could be.

we have a Windows Terminal Server at Beuth University of Applied Sciences. Students log into it from client computers.
Only the first one starting Kojo by the Start menu succeeds. For all subsequent trials we only see a second-lasting hourglass, which diappears without a message. After exiting the first Kojo instance, another instance can be started.
As we do not know this behavior from other Java applications we suppose the little kojo.exe to be guilty.
In the Kojo2\bin directory there is a shell script for starting Kojo. It collects all .jar files from Kojo2/lib.
Do you have an equivalent script as Windows batch file for trying a workaround?
Or how could we diagnose, why only the first Kojo instance can start?

Thank you very much,
Christoph

import scala.io._ //> import scala.io._
val in = Source.fromFile("C:\\linuxwords.txt") //> in: scala.io.BufferedSource = non-empty iterator
val words = in.getLines //> words: Iterator[String] = non-empty iterator
words.length //> res72: Int = 45374
val wordList = words.toList //> wordList: List[String] = List()
words.length //> res73: Int = 0

Thanks! Matteo

we need some help…

We want in teaching purposes write small games with two cannons. The main problem now is how to do correct animation with loaded images ?
We want that children draw two cannons and background. Than we scan this pictures, extract background and canons and put in into Kojo scene.
So the problems:
1. every drawn image overlaps the image we want to draw at runtime (example below)
2. we have original canon image that is paralel to X axis, and we want to rotate it in absoulte manner like "rot(13) -> im", but not in reference manner like in example below.
3. how correctly we should draw the scene (possibly using picture stack)
- draw background
- above background should place two cannons
- than print wind/gravity/velocity/other data

import Staging._ import Staging.{animate, wipe} cleari val im = PicShape.image("/home/alex/circle.png") // small picture about 60x60 pixels val ang=1; animate{ wipe im.rotate(ang).realDraw() line(0,0,200,200) }

M v h Klas

import Staging._ import Staging.{screenSize, dot} reset screenSize(200, 200) println(screenWidth) background(black) class ColorGen { var map = Array.ofDim[Int](200, 200) map(0)(0) = random(256) for (i <- 1 until 200) { map(i)(0) = if (random(5) == 0) random(256) else map(i-1)(0) map(0)(i) = if (random(5) == 0) random(256) else map(0)(i-1) } def get(i: Int, j: Int): Int = { if (map(i)(j) == 0) { val d = random(3) + 1 map(i)(j) = if (random(1000) == 0) random(256) else {get((200+i-(d&1)) % 200, (200+j-(d >> 1)) % 200)} } map(i)(j) } } val r = new ColorGen val g = new ColorGen val b = new ColorGen for (x <- 0 until 200; y <- 0 until 200) { stroke(color(r.get(x,y), g.get(x,y), b.get(x,y))) dot(x, y) } println("DONE")

I then did the same sample in Processing and found it capable of repainting a 200x200 square over thirty times per second.

Does this happen because Kojo is inherently slower, or because it is not suitable for pixel graphics?

I'm looking to perform an unattended installation of Kojo is this possible?
I've tried 'java -jar install.jar -options install.properties', but aside from INSTALL_PATH I have no clue as to what I'm supposed to enter in the properties file, if this is even an option.

/chris

clear() setBackground(black) setPenColor(red) setFillColor(blue) for (i <- 1 to 5) { forward(200) right(144) }

Kojo Design

clear() setBackground(black) setPenColor(red) setFillColor(blue) for (i <- 1 to 12) { for (i <- 1 to 4) { forward(50) right(90) } penUp() right(180 - 180 * 10 / 12) forward(50) penDown() }

I notice that the currently released GeoGebra software is already translated into Dutch, but that Dutch translation is not included in Kojo. How can be get the Dutch translation of GeoGebra into Kojo?

println("output")
var myInt:Int = 1
myInt * 2

on the output pane it will only show "output", for the results I have to run the script as a worksheet. I'd like the Output pane to display also

myInt: Int = 1
res1: Int = 2

Cheers, M

Ps: I like Kojo a lot!!!

I would like to enable Kojo without creating a security hole. Any suggests would be appreciated.

(Testing if I can post links.)

It doesn't look like this has come up on the forums before, and there
are a lot of good ideas:

http://www.soe.berkeley.edu/boxer/20reasons.pdf
via http://lambda-the-ultimate.org/node/4695

Rushi Shukla said:
I have all pre-requisites for building kojo but after issuing the 'ant build' command , I get the following error :

BUILD FAILED
/home/rushi/netbeans-7.3/harness/suite.xml:184: The following error occurred while executing this line:
/home/rushi/git/kojo/kojo/ScalaEditorLite/build.xml:8: The following error occurred while executing this line:
/home/rushi/git/kojo/kojo/ScalaEditorLite/scala-build.xml:10: You must set SCALA_HOME or environment property and append "-J-Dscala.home=scalahomepath"
property to the end of "netbeans_default_options" in NetBeansInstallationPath/etc/netbeans.conf to point to
Scala installation directory.

Rushi,

Please work with the Kojo2 project - http://code.google.com/p/kojolite/; you seem to be trying out Kojo1

Cheers,
- Lalit

In particular, I don't really need to change the equal sign assignment operator - I just want to put in another operator that does the same thing. Perhaps something like the old Pascal-style ":=" assignment operator.

It seems like this shouldn't be too hard but I really don't trust my programming skills to be able to do this without potentially causing some major problems somewhere.

How easy would this be and how might I go about doing this?

Any help would be appreciated.
Thanks & Best Regards,
NN

we are doing some really cool stuff here at my school. I am teaching a load of 13 year olds how to program for the first time.

They have mastered repeating, defining and calling.

I would like to introduce them to conditional loops such as if else. Could anyone provide me with some simple examples of a visual nature e.g. if we define two squares called sq1 and sq2. When we call sq1 it draws a blue square and when we call sq2 it draws a red one.

These guys are real novices so I don't want to over face them and turn them off programming for life.

Thanks

Joe

In one of the ebooks it shows an undo button on the script editor, but mine does not have it. I have tried edit undo and control z.

I am using Version: Beta-250512-1

Thanks

But even then I am getting the below:

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
[scalac] at java.util.jar.Manifest$FastInputStream.<init>(Manifest.java:313)
[scalac] at java.util.jar.Manifest$FastInputStream.<init>(Manifest.java:308)
[scalac] at java.util.jar.Manifest.read(Manifest.java:176)
[scalac] at java.util.jar.Manifest.<init>(Manifest.java:50)
[scalac] at java.util.jar.JarFile.getManifestFromReference(JarFile.java:167)
[scalac] at java.util.jar.JarFile.getManifest(JarFile.java:148)
[scalac] at sun.misc.URLClassPath$JarLoader$2.getManifest(URLClassPath.java:696)
[scalac] at java.net.URLClassLoader.defineClass(URLClassLoader.java:228)
[scalac] at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
[scalac] at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
[scalac] at java.security.AccessController.doPrivileged(Native Method)
[scalac] at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
[scalac] at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
[scalac] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
[scalac] at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
[scalac] at scala.tools.nsc.Global.throwableAsString(Global.scala:168)
[scalac] at scala.tools.nsc.Global.logThrowable(Global.scala:165)
[scalac] at scala.tools.nsc.Main$.process(Main.scala:113)
[scalac] at scala.tools.nsc.Main$.main(Main.scala:123)
[scalac] at scala.tools.nsc.Main.main(Main.scala)

Indentation should follow the “2-space convention”. … [some code examples follow]

The Scala language encourages a startling amount of nested scopes and logical blocks (function values and such). Do yourself a favor and don’t penalize yourself syntactically for opening up a new block. Coming from Java, this style does take a bit of getting used to, but it is well worth the effort.

The Script Editor currently seems to apply the 4-space convention: admittedly this is what I'm used to myself and therefore seems perfectly normal to me (e.g. it's in the PEP8 Python style guide and is standard in Java) but there would seem to be some logic in following Scala's style guide. A foolish consistency is the hobgoblin of little minds etc, but Kojo's default layout, with the Script Editor and Output Pane sharing the bottom of the screen, does leave the typing space fairly narrow.

//music
val score2= MusicScore(
Melody("Piano", "A5h E5q E5q A5w G5h D5q D5q G5w A5w+E5w_G5w+D5w"),
Melody("Piano", "X[Volume]=15000 Rw Rw Rw Rw Rw Rw A5w+D5w")
)
repeat(2) {
playMusic(score2)
}

In Kojo, I can achieve a similar thing in the Storyteller, but putting in a text field and button for the user input, and once the user has typed in the value they want, they can press the button to implement the change.
The advantage of the input form is that the user can precisely specify the change they want (using a slider can be very frustrating if trying to get an exact value!)

But the slider has several big advantages too: the designer can easily restrict the range of user input to those that produce sensible results, and the user can drag the slider back and forth and see how the diagram changes dynamically.

Is there a way to implement a slider in the Kojo Storyteller, so that as soon as a movement in the slider is detected, the associated slider action is performed?

(I can think of several things I'd like to do where it would be nice to have both a slider and more precise input; if the form/button were used to change the variable then the setting on the slider needs to change. Conversely when the slider is moved, it would make sense for the text in the form to be updated to match too. How would this be done?)

The utterly fatal problem is lack of documentation. I am sorry, but it is just not possible to use this software in an educational setting unless (a) the students have access to a decent-enough help file that they can solve the "little problems" for themselves (if 2 kids in the class are stuck and have their hands up, I can cope, if 10 do the wheels fall off the session pretty quickly!), (b) the teacher has some way (and it has to be a relatively easy way - educators are stressed and frantically busy, so we tend to take the path of least resistance) of getting seriously competent with the software, so that we can design lessons (or borrow and adapt other people's) and structure the students' learning experience. The experience when using educational software from established for-profit publishers is usually quite pain-free: they often have excellent (extensive and well-written) documentation available in the software, as well as instructor's manuals for teachers to help with lesson-planning. And on top of that is a whole training and support ecosystem: the tech guys can call for product support; the publishers send out training teams into schools, colleges and local authorities; there is "cascading" of training, during professional development sessions, in which educators who have received more training or had greater experience of the software, share ideas and lessons plans, and coach their colleagues (sometimes from a cluster of local schools) in new techniques. When I'm faced with the choice of "shall I do this in Kojo, or something else?" this is the why the path of least resistance is usually "not Kojo", even though Kojo may be the superior as a software tool!

Some kids can experiment with the various options that come up with "autocomplete", and play around until it works. For very able kids that's fine…especially if they have curiosity and motivation. But there are lots of kids who just don't work that way. From a teaching point of view, a first priority is that an activity has to be accessible to the weakest student in the class. Also, it's important as a teacher to feel really confident that you know the software as thoroughly as you need to. For some of your commercial rivals that's easy for me: I got extensive software training when doing teacher-training, then top-up courses from publishers and local authorities, I've seen lots of brilliant ways to use the software innovatively, and on those occasions when in the middle of the lesson I get stuck on something (usually because one of the kids has found a brilliantly innovative way to make a mistake!) then I can usually get unstuck within 60 seconds, with some help from the documentation if needed.

With Kojo I'm not sure how I can get to that point. Obviously there's no training courses available for me, but that's been ok with some other software. (Hopefully in future there will be online videos and so on, and maybe even a "real life" training ecosystem.) But in those other cases I did have a good set of documentation to work through. There are some strategies I can take - e.g. teach very constrained, rigid, formulaic lessons where I stick to the bits of Kojo that I have the most confidence in (due to extensive playing around!) but doing that negates the flexibility of Kojo which is its real strength! There is a lack of material for educators (instructor's manual, lesson plans, or even just more pedagogically-inclined examples) but I could actually live with that - though I know for a fact, other educators will need such content to be available before they adopt. I love teaching, I love using computers to enhance understanding, I love sharing new ideas, I love open-source - for all those reasons I'd be VERY enthusiastic about adding to the Kojo content ecosystem, sharing code and teaching tips, and so on.

But it's difficult for me to get started: I need to find a way to get up to "better than an experimental beginner" status and I can't see how to. The needs of instructors need to be considered separately: only a tiny proportion of us are going to be "power users" or potential developers, but neither are our needs quite the same as the students we hope to teach with Kojo. I think until that's addressed, early-adopting tech-savvy educators whose interest lies in the educational applications of Kojo rather than developing it, are not going to be able to kick-start the sort of content eco-system that can then draw in other educators (who might like a cool shiny new thing, but only after they've seen some concrete examples of what it can do).

There's a second problem with Kojo. This one's not fatal, but will undermine take-up and makes it substantially less useful to me and other educators than some rival software. I don't think it's possible to embed in a web browser. In terms of features, rather than documentation, I think this is the biggest sticking point! It makes it much harder to integrate Kojo into Virtual Learning Environments, or get students to use it remotely (e.g. for homework, or if they want to use a Kojo animation or interactive learning activity to revise). Also, in terms of generating "buzz" about Kojo this is a pretty serious limitation - someone has to install the software to see just how good Kojo is! And at colleges/schools, please remember that most educators CAN NOT install software on the network (user-rights guarded zealously by IT departments) so it'd be impossible to show off to colleagues a "cool new interactive demonstration" you have designed. I have no idea how difficult it would be to get Kojo working in a browser, but if there is some possibility, it would be far more useful than any new feature inside the software itself! Because no matter how good your fancy new feature is, if I can't show it to colleagues then I can't convert them, and if I can't share it with my students via the VLE, then its educational use is limited.

If you could give me some advice on how to get up to a "good" standard at using Kojo, I would love to help you build a "Kojo content community" which is clearly one of the things you need most at the moment. If you could give me some direction about the possibility of Kojo being integrated in a browser, that would substantially change the type of educational material I'd focus on using Kojo to produce. (If it can't be used in a browser, then it's pointless to build animations or interactive demonstrations like the "sine graph from the unit circle" tutorial. I'd be better to do it in e.g. Geogebra for VLE integration and so students can see it at home when they're revising. An ex-colleague of mine actually produced essentially the same tutorial as part of a larger trigonometry e-learning package, and won an award for it. He used a MS Excel plugin because that's what our VLE supported. Kojo excites me because I can see it would be able to produce more powerful and useful interactive demonstrations than both Geogebra and that Excel plugin… but if it can't work in browsers, my educational use of Kojo would focus more on the programming aspect.)

Two pieces of advice and one more query. First, please please don't charge for the ebooks. It's counterproductive - if you want to monetize Kojo, you're far better to focus on growing a professional user community to service. Lack of documentation, particularly for beginners, is the biggest logjam to growth. In contrast, delivering professional training courses, and e-learning consultancy services to education authorities, can be big money! Secondly, as I said above, please during your development consider separately the needs of your "professional users" and your "student users". Unless Kojo draws in the educators, you won't get students experiencing its benefits! Bear in mind that not all educators are tech-savvy or feel confident in their use of computers, even if they hope to use them in their professional practice. Imagine how scary it must be for a teacher, who feels that students know more about computers than him, to use a new piece of software in class that he is not experienced with! Such professional users face a daunting learning curve, but it's not the same one as students do! Finally a query. The "mathworld" is wonderful, but seems less powerful than "raw" Geogreba. I can't seem to find some functionality: polygons and semicircles are useful but seem to be missing. Is this because Kojo doesn't use Geogebra 4? Or are those functions just hidden somewhere?

Best regards and many thanks for making such a wonderful piece of software available for free!

I added some libs to my local kojo env. Perfect.

But the log information coming from those libs is ignored or at least I'm not able to find.

Can someone guide me to how I can get that working?

Cheers, Volker.

If I enter:

def minmax(x: Int, y: Int): (Int,Int) = { if (x > y) (y,x) else (x,y) }

Single line functions don't seem to trigger this behavior. Also it doesn't happen if I've just opened the Scala Tutorial story and cleared the editor.

Is there some way of entering this "full sala" mode without opening the Scala Tuturial?

Thanks and I greatly enjoy this tool BTW!

Steve Harris and son

Thanks,

Craig.

Anyway, thanks you for making Kojo available, it's a great environment for teaching kids how to program. I teach physics (with electronics and computer science stuff) in a French high school in Paris. I've used differents langages and environments (pascal, C, python, smalltalk Squeak,DrRacket scheme) during the 10 last years but I want to switch this year with scala as langage and Kojo as IDE.

From my experience when teaching programming to kids (secondary school, 13-18 years old) you need:

1. a good langage:
- a simple and concise syntax (scheme,smalltalk, python and scala are good)
- algebraic notation like usual math notation (python, scala)
- real functional programming is an advantage since many concepts are already seen in math (scheme, scala, python)
- high level data collections as list, set, dictonary (hash table)(scheme,smalltalk, python, scala)

2. a good environment:
- an interactive Read-Eval-Print Loop (scheme,smalltalk, python, scala)
- friendly debug system, stepping… (DrRacket scheme, Squeak, Greenfoot)

3. Fun: graphics programs, drawings, sprites games (DrRacket, Squeak, Greenfoot, Kojo)

Bonus:
- interactive geometry with integration of geogebra (Kojo, Mathpiper)
- C.A.S. Computer Algebra System (Mathpiper)

Considering both the langage and the environment, Kojo is a great chalenger.
In my point of view, inspiring environments for kojo would be:

DrRacket:
http://racket-lang.org/
http://docs.racket-lang.org/quick/index.html
http://world.cs.brown.edu/
http://www.htdp.org/

Greenfoot:
http://www.greenfoot.org/

Mathpiper: (interactive geometry and computer algebra system in a functional programming langage).
http://www.mathpiper.org/

Xavier Coolen.

Is there any chance of introducing animation of 2D or 3D models with connections, movement, and forces like gravitation and magnetism?

Is it possible to use a more full featured IDE, like Eclipse, with Kojo?

Thanks,
Mushtaq

PS: Thanks for making this amazing tool!

I’m using Kojo to teach kids programming in Sweden.
I think the environment is great!

I would like to test if a key is pressed or not (without haning) in order to enable the kids make easy games where they control the turtle in realtime using the keyboard.

Is there an easy way of doing this?
I tried to look in codecompletion for Staging. , but found no keypressed etc as there seem to be in the corresponding processing environment: http://www.processing.org/reference/

Anyway of polling the keybord with the builtin stuff?

Cheers
Bjorn

Instructions for building Kojo with Netbeans 7 are available here:
http://code.google.com/p/kojo/source/browse/Build.txt

The older version of Kojo (which ran on the Netbeans 6.8 Platform), now lives on the NB6.8-scala2.8.x branch (http://code.google.com/p/kojo/source/browse/?r=NB6.8-scala2.8.x).