how to register methods in Processing-2b1?

nakednous

how to register methods in Processing-2b1?

in Library and Tool Development • 1 year ago

Hi all,

(thanks for the recent great release!)

It seems there's a new event registration method in Processing-2b1 which deprecates the old one. Does anyone know how it works now? The wiki seems outdated ( http://code.google.com/p/processing/wiki/LibraryBasics).

The deprecated mouse event method still works for me (proscene), i.e., parent.registerMouseEvent, but no the parent.registerKeyEvent, as I'm getting the following runtime error:

Exception in thread "Animation Thread" java.lang.IllegalArgumentException:
argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at processing.core.PApplet$RegisteredMethods.handle(PApplet.java:1076)
at processing.core.PApplet.handleKeyEvent(PApplet.java:2848)
at processing.core.PApplet.dequeueKeyEvents(PApplet.java:2793)
at processing.core.PApplet.handleDraw(PApplet.java:2132)

Do you think is it a bug?

Cheers,

Jean Pierre

Replies(9)

quarks

Re: how to register methods in Processing-2b1?

1 year ago

You are right ALL the registerXXX and unregisterXXX methods have been deprecated and I can't find any information on why or what is the alternative.

Considering these were the recommended way for contributed libraries to respond to events in Processing suddenly deprecating them is a concern.

I also notice that PFont.getFont() has disappeared and which is a pity since it gave access to the underlying system font.

calsign

Re: how to register methods in Processing-2b1?

1 year ago

According to the revisions file:

+ New syntax introduced for libraries and registered methods. 
  Documentation coming soon.

I guess we have to wait...

quarks

Re: how to register methods in Processing-2b1?

1 year ago

@calsign

Well spotted and I see it explains the PFont.getFont() as well.

I only hope the new syntax documentation comes soon and is well publicised, I am in the middle of a major upgrade to the G4P library and it uses these registered methods extensively so I feel as if the ground has just opened up under my feet.

nakednous

Re: how to register methods in Processing-2b1?

1 year ago

the previous event registration methods depended on java.awt.event. Maybe the new methods will allow us to register android events too which will be great for those planning to support this mode too.

@quarks, do you notice any issue with parent.registerKeyEvent? It's not working for me (please see above).

monkstone

Re: Re: how to register methods in Processing-2b1?

1 year ago

I have a feeling that the new registerMethod api has not been completely implemented, I can't see how it can work for methods with args!!! The legacy support for libraries seems to run OK on its own, but mix it with the new keyPressed method in your sketch for examples and it blows up.

monkstone

Re: Re: how to register methods in Processing-2b1?

1 year ago

I can confirm keyPressed seems to be fixed in latest svn version (I don't need too much documentation) but from the few steers from Ben below here's an extract from my library with the new api working:-

/**
*
* @author Martin Prout
*/
public class Button {
int x;
int y;
int w;
int h;
boolean pressed = false;
boolean clicked = false;
/**
*
*/
protected final PApplet applet;
/**
*
* @param outer
* @param x coordinate 1st point
* @param y coordinate 2nd point
*/
public Button(final PApplet outer, int x, int y) {
this.applet = outer;
this.applet.registerMethod("dispose", this);
this.applet.registerMethod("mouseEvent", this);
this.applet.registerMethod("keyEvent", this);
this.x = x;
this.y = y;
}
/**
* Set width and height of selectable rectangle
*
* @param width
* @param height
*/
public void setSize(int width, int height) {
this.w = width;
this.h = height;
}
/**
* determine whether point(mx, my) is over rectangle
*
* @param mx
* @param my
* @return
*/
public boolean overRect(int mx, int my) {
if (mx >= this.x && my >= this.y && mx <= this.x + this.w && my <= this.y + this.h) {
return true;
} else {
return false;
}
}
/**
* Mouse events to register
*
* @param e
*/
public void mouseEvent(processing.event.MouseEvent e) {
int mx = e.getX();
int my = e.getY();
switch (e.getAction()) {
case processing.event.MouseEvent.PRESSED:
pressed = overRect(mx, my); // only controls graphic
break;
case processing.event.MouseEvent.CLICKED:
if (clicked == false) // idempotent
{
clicked = overRect(mx, my);
}
break;
}
}
/**
* Key events to register, in case GUI doesn't display eg with peasycam
*
* @param e
*/
public void keyEvent(processing.event.KeyEvent e) {
if (processing.event.MouseEvent.RELEASED == e.getAction()) {
switch (e.getKey()) {
case 'r':
case 'R':
if (clicked == false) // idempotent
{
pressed = true;
clicked = true;
}
break;
}
}
}

ben.fry

Re: how to register methods in Processing-2b1?

1 year ago

Yes, what's seen in the original post is a bug. Old libraries should be working unchanged, it was a typo in the code that's breaking key events. I've now fixed it and things should be right again with beta 2 when it's available.

The new API replacing the deprecated version is the following:

1) registerPre(this) becomes registerMethod("pre", this). You might be able to guess what all the others look like.

2) We're moving to make Processing more cross-platform (for desktop, Android, JS, etc) so I'm taking things like java.awt.event.MouseEvent out of the API (it's not available on Android, for instance). As a result, there's now a processing.event.MouseEvent class that I've not had time to document, but will properly wrap input events for both desktop and Android. This is a necessity because otherwise libraries that call registerMouse() on Android would simply crash.

3) registerMethod("mouseEvent") expects a function with processing.event.MouseEvent, not a java.awt.event.MouseEvent.

The event handling is a lot of work to document properly, and I just haven't had the time yet. It's one of the reasons this is "beta" and not the final "2.0". For everyone but library authors, however, the changes should be all but hidden.

The change to getImage() and getFont() is for a similar reason, and is documented in revisions.txt. If something changes, it will almost always be in revisions.txt. Read it. It's good for you. You can at least take the time to read the documentation I *have* had time to prepare for you. ;-)

mrweix

Re: how to register methods in Processing-2b1?

1 year ago

Hello, thanks for the beta update! I don't understand the new Font handling however.

How should one change the following code, that works with 2.0alpha? Thanks!

PFont pfont = createFont("bitFont", 12, true);
ControlFont font = new ControlFont(pfont);
controlP5.setControlFont(font);

mrweix

Re: Re: how to register methods in Processing-2b1?

1 year ago

I found the solution:

PFont pfont = createFont("bitFont", 12, true);
ControlFont font = new ControlFont(pfont,12);
controlP5.setControlFont(font);