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Index › Programming Questions & Help › Syntax Questions › Multiple .java files in a sketch
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Multiple .java files in a sketch (Read 611 times)
Alterscape
Multiple .java files in a sketch
Sep 15th, 2005, 3:05am  
For code reusability, I'm writing each class in my simple particle/physics library as a seperate java file within my processing folder, added to the sketch through the sketch->add file.. menu choice. However, when I try to use things like the PImage datatype in files other than the "main" file for the sketch, I get errors like: Type "PImage" was not found.  The same occurs when I try to use functions from the processing API.  How do I deal with this? I imagine I have to set up a situation where a parent variable within the new class contains a pointer to the main PApplet, and then use parent.sphere() and etc, but I'm a bit fuzzy on the details. Help?

Cheers,
Ryan Spicer
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fry
Re: Multiple .java files in a sketch
Reply #1 - Sep 15th, 2005, 1:45pm  
you need to add:

import processing.core.*;

to the top of any java files that need the PXxxx stuff. or imports for any of the other libraries that you might be using.

when creating your other object, say it's called Particle, you need to pass the PApplet in the constructor and do that parent thing. so for instance:

Code:
// in the first tab

Particle p;

void setup() {
  p = new Particle(this);
}
void draw() {
  p.draw();
}


// in your other java file

public class Particle {
  PApplet parent;

  public Particle(PApplet parent) {
    this.parent = parent;
  }
  public void draw() {
    parent.line(20, 20, 80, 80);
  }
}
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WWW  
Alterscape
Re: Multiple .java files in a sketch
Reply #2 - Sep 15th, 2005, 2:45pm  
Thanks for the info, Fry. That's just what I needed. Smiley
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