G4P is a newish library which provides a range of useful widgets (buttons, sliders, option buttons, checkboxes etc.) to control your sketch. It has a number of built in color schemes and the ability to create your own. The font used can be any font on your computer. The user can also change the transparency of the controls. It supports simple event handling with the ability to define separate event handlers for each control.

This latest release of G4P (V1.4) has a number of enhancements including:

• cursor change over controls
• multiple windows that can be used for output or controllers or both

Examples of these can be found at
http://gui4processing.lagers.org.uk/examples.html
it is also possible to download the library from this site.

If the program is short enough could you post your code here or send it as a personal message and I see what I can do about it.


Edit:
Don't post the code I have been able to reproduce the error and I think I have found the bug in the code so will try and fix it tonight. :

The OPENGL in second window problem is now fixed V1.4.1 is now available for download either from the website or GoogleCode.

addDrawHandler should work with any class. Lets assume the object to handle the draw method is called 'sketcher' and the method to do the drawing is called drawMe.

Things to watch out for:

• the object sketcher must have been instantiated before calling this method
• the drawMe method (in the sketcher class)  must have the signature
      void drawMe(GWinApplet app, GWinData data){    }
      If you are doing this in Eclipse then make it public void drawMe...

If you get these wrong then you will get an error message in Processing output panel under the code editor panel saying something like non existent method.

I assume you want to extend GWindow to get additional attributes for the Lorenz Attractor viewer.

If you do this then in the child class you should create a constructor than matches the one used in GWindow to create the window. In this constructor the first statement should call the GWindow ctor with the appropriate arguments and then does your stuff. Make sure that the child class has the drawMe method. Create an object of the child class e.g. sktcher and call

sketcher.addDrawHandler(sketcher, "drawMe");

When I added multiple windows to this library I envisioned that someone might create multiple GWindow objects but that each window needed it's own data so I created the GWinData class that could be extended and each window would have its own (child of) GWinData object. You can see this approach in the Mandelbrot example.

Anyway I am working on a new library for handling sprites (using bitmap images) so I think I will do some work on that now.

If you have problems I suggest that you post a message on the Syntax Questions thread as I look there on a regular basis.

Good luck

Quote:


It would probaly be easier the other way round it would then be possible to have a single control panel that can control different views of the Lorenz Attractor in separate windows. Look at how  the Manelbrot code is used, but what you want to do is not impossible.

If you want the control panel to be sub window then the following might make it clearer how G4P works.

First consider a single window Processing sketch the main window is based on the PApplet class which contains a graphics context to draw on - all the commands such as stroke(), pushMatrix() etc use  the methods in PApplet and the graphics context.

When you create a GUI object such as GSlider the first attribute is always a reference to the PApplet object responsible for drawing the GUI component.

In the examples the GUI components are created in the main window and then added to the GWindow using the GWindow add() method - this changes the PApplet responsible for drawing the object to the one in the GWindow.

When you create a GWindow you are creating an object that extends the java.awt.Frame class to get the actual window  but the GWindow ctor also creates a new GWinApplet object which is a subclass of PApplet to get the drawing area.

Ok so going to your child class ctor

Code:

    super(_theApplet, "Visualizer", 650, 100, 600, 275, false, null); //that's the first line of code
    this.addData(new GWinData());
    
    // init stuff...

    this.addDrawHandler(this, "visualizerDraw"); //correct?
 
 

After the call to the GWindow ctor using super(....) the GWinApplet will have been created, it should be possible to use this in your GWindow subclass to create and add GUI components. The name of the GWinApplet object is 'embed' so in your ctor you could do something like

Code:

    super(_theApplet, "Visualizer", 650, 100, 600, 275, false, null); //that's the first line of code
    this.addData(new GWinData());
    
    // init stuff...
 slider = new GSlider(embed, ...);
    this.addDrawHandler(this, "visualizerDraw"); //correct?
 
 

Where slider is a GSlider attribute of your child class. The event handlers for GSlider would also be in your child class.

Hope this helps.

Hm, exported the applet and index.html runs fine on my machine, but when I upload it to OpenProcessing, it can't find the G4P classes Do I need to do export the library somehow?

Yeah, I saw the OpenGL issue too. But that was OK, P3D didn't make it much uglier ^^

Duh. I set the mode to P3D but forgot to erase the OpenGL import line.

Uploaded a new one (since I wasn't logged in when I uploaded the first )

http://openprocessing.org/visuals/?visualID=2362 so there. Again, thanks for the lib and help, it would just be uninteractive eyecandy without it.

Control panel has blank space intended for future functionality, but I agree I could make it narrow while I don't implement it. There is a link on exhibtions already