Scene Graph Demo Convert to JRuby Problem

paulf · August 8, 2008, 3:45am

Hi All,

Trying to convert a Scene Graph demo “Nodes” to JRuby.
https://scenegraph-demos.dev.java.net/demos.html
This line:
Composer.register(AffineTransform.class, TransformComposer.class)
gives this error:
C:/Users/paulAdmin/Documents/NetbeansProjects/scene_graph_work/lib/scene_graph.rb:1:
expected [java.lang.Class, java.lang.Class]; got:
[org.jruby.RubyClass,org.jruby.RubyClass]; error: argument type mismatch
(TypeError)

I am probably out of my depth here, but are the experts able to help?
How do I “cast” an “org.jruby.RubyClass” to a “java.lang.Class” or what
procedure should be used in this case?

Thanks
Paul F.

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paulf · August 8, 2008, 4:03am

On Thu, Aug 7, 2008 at 6:44 PM, Paul F. [email protected] wrote:

(TypeError)

I am probably out of my depth here, but are the experts able to help?
How do I “cast” an “org.jruby.RubyClass” to a “java.lang.Class” or what
procedure should be used in this case?

What does the Ruby code you wrote look like?

/Nick

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paulf · August 8, 2008, 4:21am

Paul F. wrote:

(TypeError)

I am probably out of my depth here, but are the experts able to help?
How do I “cast” an “org.jruby.RubyClass” to a “java.lang.Class” or what
procedure should be used in this case?

If AffineTransform is a Java class, you want to call .java_class to get
it out. I know, it’s gross. I’m hoping to improve that post 1.1.4.

Charlie

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paulf · August 8, 2008, 4:25am

On Thu, Aug 7, 2008 at 9:22 PM, Paul F. [email protected] wrote:

Composer.register(AffineTransform.class, TransformComposer.class)

What does the Ruby code you wrote look like?

Hi Nick,

I did not write it, just converting it , this is how some of it looks at
present, a bit messy at this stage, but, does this help?

Composer.register(AffineTransform.class, TransformComposer.class);
<<<<<<<<<<<<<<<<<<<<<<<<<<<< trouble

AffineTransform.java_class, TransforComposer.java_class

Calling .class gets Ruby class versus the Java class.

-Tom

–
Blog: http://www.bloglines.com/blog/ThomasEEnebo
Email: [email protected] , [email protected]

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paulf · August 8, 2008, 4:33am

Charles Oliver N. wrote:

[org.jruby.RubyClass,org.jruby.RubyClass]; error: argument type
mismatch (TypeError)

I am probably out of my depth here, but are the experts able to help?
How do I “cast” an “org.jruby.RubyClass” to a “java.lang.Class” or
what procedure should be used in this case?

If AffineTransform is a Java class, you want to call .java_class to
get it out. I know, it’s gross. I’m hoping to improve that post 1.1.4.

Charlie

Charlie,

Both of these fail:
Composer.register(AffineTransform.class.java_class,
TransformComposer.class.java_class)
error:

C:/Users/paulAdmin/Documents/NetbeansProjects/scene_graph_work/lib/scene_graph.rb:79:
undefined method `java_class’ for Class:Class (NoMethodError)

Composer.register(AffineTransform.java_class,

TransformComposer.java_class)
error runtime:
com/sun/scenario/animation/Composer.java:162:in `register’:
java.lang.IllegalArgumentException: Problem constructing appropriate
Composer for type class java.awt.geom.AffineTransform: (NativeException)

What form should the call take?

Thanks
Paul F.

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paulf · August 8, 2008, 4:43am

Paul F. wrote:

expected [java.lang.Class, java.lang.Class]; got:

Charlie

Charlie,

Both of these fail:
Composer.register(AffineTransform.class.java_class,
TransformComposer.class.java_class)
error:

AffineTransform.java_class

Charlie

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paulf · August 8, 2008, 4:45am

Paul F. wrote:

error runtime:
com/sun/scenario/animation/Composer.java:162:in `register’:
java.lang.IllegalArgumentException: Problem constructing appropriate
Composer for type class java.awt.geom.AffineTransform: (NativeException)

What form should the call take?

Gah, previous mail sent too soon.

In the latter case it looks like it worked exactly like it’s supposed
to; it was able to receive the AffineTransform class correctly. That
exception is coming out of Sun’s library, not out of JRuby…

Perhaps that method is not supposed to take a Class?

Charlie

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paulf · August 8, 2008, 4:23am

Nick S. wrote:

expected [java.lang.Class, java.lang.Class]; got:
[org.jruby.RubyClass,org.jruby.RubyClass]; error: argument type mismatch
(TypeError)

I am probably out of my depth here, but are the experts able to help?
How do I “cast” an “org.jruby.RubyClass” to a “java.lang.Class” or what
procedure should be used in this case?

What does the Ruby code you wrote look like?

Hi Nick,

I did not write it, just converting it , this is how some of it looks at
present, a bit messy at this stage, but, does this help?

require ‘java’

import com.sun.scenario.animation.Clip;
import com.sun.scenario.animation.Composer;
import com.sun.scenario.animation.Interpolators;
import com.sun.scenario.animation.Timeline;
import com.sun.scenario.scenegraph.JSGPanel;
import com.sun.scenario.scenegraph.SGComponent;
import com.sun.scenario.scenegraph.SGComposite;
import com.sun.scenario.scenegraph.SGGroup;
import com.sun.scenario.scenegraph.SGImage;
import com.sun.scenario.scenegraph.SGShape;
import com.sun.scenario.scenegraph.SGText;
import com.sun.scenario.scenegraph.SGTransform;
import com.sun.scenario.scenegraph.fx.FXNode;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.LinearGradientPaint;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

class TransformComposer < Composer

def initialize
super(6)
end

def decompose(o,v)
o.getMatrix(v)
return v
end

def compose(v)
return AffineTransform.new(v)
end
end # class TransformComposer

class Nodes
include ActionListener

SCREEN_W = 300, SCREEN_H = 400;
FADE_DUR = 500;
CLIP_DUR = 500;
TEXT_X = 100;
TEXT_Y = 40;
IMAGE_X = 23;
IMAGE_Y = 3;
IMAGES_LABEL = "Images ";
SHAPES_LABEL = "Shapes ";
COMPONENTS_LABEL = "Components ";
TEXT_LABEL = "Text ";
ANIMATION_LABEL = "Animation ";
TRANSLUCENCY_LABEL = "Translucency ";

Composer.register(AffineTransform.class, TransformComposer.class);

<<<<<<<<<<<<<<<<<<<<<<<<<<<< trouble

def initialize
@rootNode = SGGroup.new
# # JPanel controlPanel;
# # SGTransform componentScaler;
# # private Clip textFadeIn, textFadeOut;
# # private Clip imageFadeIn, imageFadeOut;
# # private Clip shapeFadeIn, shapeFadeOut;
# # private Clip bgFadeIn, bgFadeOut;
# # private Clip componentScaleOut, componentScaleIn;
@nodeGroupMover = Timeline.new
@numSelected = 0;
# # private SGComposite componentTranslucency;
# # private AffineTransform cpScaleLarge;
@duke = nil
#
# # // preload image
# # try {
# imageURL = getClass.getResource(“images/duke.gif”)
# duke = ImageIO.read(imageURL)
# # } catch (Exception e) {
# # System.out.println("problem loading image: " + e);
# # }
# #
# # // Create actual window frame
f = JFrame.new(“Nodes Demo”)
# # try {
# #
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
# # } catch (Exception e) {
# # System.out.println("problem with l&f: " + e);
# # }
f.setDefaultCloseOperation(JFrame::EXIT_ON_CLOSE)
# #
setupNodes
setupPanel(f)
# #
f.invalidate
f.pack
f.setLocationRelativeTo(nil)
f.setVisible(true)
# #
end # def initialize

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paulf · August 8, 2008, 5:25am

Charles Oliver N. wrote:

The only problem here is that the java version works
So, possibly static has something to do with it!
Ah Ha, Ask the question again, how should the following be coded in
JRuby?

static {
Composer.register(AffineTransform.class, TransformComposer.class);
}

Paul

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paulf · August 8, 2008, 5:55am

Paul F. wrote:

Charlie

The only problem here is that the java version works So,
possibly static has something to do with it!
Ah Ha, Ask the question again, how should the following be coded in
JRuby?

static {
Composer.register(AffineTransform.class, TransformComposer.class);
}

Are you running 1.1.3? The code from before with .java_class should be
correct, but I suspect a bug fixed in 1.1.3 might be involved here.

Charlie

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paulf · August 8, 2008, 6:14am

Charles Oliver N. wrote:

Perhaps that method is not supposed to take a Class?
}

Are you running 1.1.3? The code from before with .java_class should be
correct, but I suspect a bug fixed in 1.1.3 might be involved here.

Charlie

1.1.3

Paul

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paulf · August 9, 2008, 5:58am

The only problem here is that the java version works So,
possibly static has something to do with it!
Ah Ha, Ask the question again, how should the following be coded
in JRuby?

static {
Composer.register(AffineTransform.class, TransformComposer.class)
The code being called is :

public static void register(Class<?> type,
                            Class<? extends Composer> implClass)
{
    Composer impl;
    try {
        Constructor<? extends Composer> ctor =
            implClass.getConstructor();
        impl = (Composer)ctor.newInstance();
    } catch (Exception e) {
        throw new IllegalArgumentException("Problem constructing " +
                "appropriate Composer for type " + type +
                ":", e);
    }
    impls.put(type, impl);
}

Is there any clue here as to cause of failure in JRuby. As previously
stated, it works in Java.
Are generics perhaps a problem here?

Thanks
Paul F.

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paulf · August 9, 2008, 6:27am

Where can I download the scenegraph lib you’re using? I want to give
this a try and help you make it work.

Paul F. wrote:

                           Class<? extends Composer> implClass)
   }
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paulf · August 9, 2008, 8:05am

Charles Oliver N. wrote:

Where can I download the scenegraph lib you’re using? I want to give
this a try and help you make it work.

Hi Charlie,

https://scenegraph.dev.java.net/
https://scenegraph.dev.java.net/source/browse/scenegraph/

Thanks
Paul F.

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paulf · August 9, 2008, 8:18am

Paul F. wrote:

Thanks
Paul F.
Also, Charlie,

Have a look at the demo,s, they are quite exciting, especially the Nodes
demo. The techniques extend the methods outlined in “Filthy Rich
Clients”
Scenegraph might be the future of desktop apps in the java space as all
swing components can be used as well as the animations etc…
It is not only for JavaFx.

Paul

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paulf · September 18, 2008, 1:14pm

Hi Paul,

Don’t know if this is the JRuby to cast objects, but this worked for me:
put your object in an one-element-array. Casts it’s elements to the
desired Java class and get the first element:

include_class ‘java.lang.Class’
obj = Object.new # Let’s say this is your Ruby object
casted = [obj].to_java(java.lang.Class)[0]

paulf · August 10, 2008, 8:07am

Paul F. wrote:

Have a look at the demo,s, they are quite exciting, especially the Nodes
demo. The techniques extend the methods outlined in “Filthy Rich Clients”
Scenegraph might be the future of desktop apps in the java space as all
swing components can be used as well as the animations etc…
It is not only for JavaFx.

Yer damn right it’s not, and I’ve just been waiting for someone to try
exactly this.

So I found the problem…it’s a known issue I really dislike, and
honestly I need to try to find a better way to fix it than the way we
did in 1.1.3.

Your TransformComposer is < Composer, which is cool. But in cases of
Ruby clases extending Java classes, java_class points at the wrong
class. You need to use java_class.java_proxy_class in this case. So
that’s bug number one.

Unfortunately bug number two is a bit more problematic. Because our Ruby
subclasses of Java classes have some JRuby baggage, I don’t think the
logic in the Composer class is going to work correctly. It looks up a
default constructor using reflection and tries to call it, but in our
case that doesn’t properly set up the class. Here’s the error that
results if I use java_proxy_class (and also construct an instance of
TransformComposer to force our lazy creation of the proxy class):

Caused by: java.lang.NoSuchMethodException:
org.jruby.proxy.com.sun.scenario.animation.Composer$Proxy0.()

Grr. So this particular path to getting scenegraph working has some
roadblocks, but they’re roadblocks I want to look at trying to fix for
this upcoming release. So I’m looking into some of them right now.

Charlie

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