singleton that registers PApplet

General Discussion Other

clankill3r

singleton that registers PApplet

in General Discussion • Other • 1 year ago

I have a class that holds another class called BezierMethods for some basic methods.

The PApplet needs to be registered to use bezierPoint etc. also there is one field called stepAccuracy which is a float.

There is no need to have more than one class BezierMethods, however atm depending on what i do i can end up in having thousands of them.

I readed a lot of implementing singleton and i like this one the most:

http://stackoverflow.com/questions/70689/what-is-an-efficient-way-to-implement-a-singleton-pattern-in-java

But can i use this? And if sow, what is a efficient way to register the PApplet (once)?

Replies(2)

PhiLho

Re: singleton that registers PApplet

1 year ago

Not sure what you mean exactly by " to register the PApplet"...
I suppose it means passing the PApplet instance to the class so it can call its methods.

" can i use this?"
Well... have you tried? Showing some code (even dummy one to test the pattern) can help us in helping you.

I haven't looked at the SO question (which can have multiple answers!)...
Note: if you have problems in your implementation, it might help to define your class in a .java file (perhaps you already do that if you need to " register" the PApplet), so isn't an inner class. Can help in using a static variable...

clankill3r

Re: singleton that registers PApplet

1 year ago

After some trial and error i got this which seems to work fine.

Elvis elvis;
Elvis th2Elvis;
void setup() {
elvis = Elvis.getInstance();
elvis.init(this);
th2Elvis = Elvis.getInstance();
println(elvis.stepAccuracy);
elvis.stepAccuracy = 2;
println(elvis.stepAccuracy);
println(th2Elvis.stepAccuracy);
}

Elvis.java

import processing.core.*;
public enum Elvis {
INSTANCE;
PApplet p;
public float stepAccuracy = 1;
public static Elvis getInstance() {
return INSTANCE;
}
public void init(PApplet p) {
if(this.p == null) {
this.p = p;
}
}
}