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Index › Programming Questions & Help › Syntax Questions › Determine Class Position in Array from within
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Determine Class Position in Array from within (Read 452 times)
jonobrone
Determine Class Position in Array from within
Feb 24th, 2010, 7:48am  
I did some searching through the forums, but I wasn't completely sure what to search for. Is it possible to return the identifier of an array of classes from the class itself?

E.G.

Code:

myObject[] group = new myObject[100];

void setup() {
    for(int i = 0; i < group.length; i++) {
        group[i] = new myObject();
    }
}

void draw() {
    for(int i = 0; i < group.length; i++) {
        group[i].update();
    }
}

class myObject {
    myObject() {
        // Constructor Information
    }

    void update() {
        // Print the position of this object
        // in the array group.
    }
}


I don't think this code will compile, but I hope it's sufficient enough to get the point across. If it's not let me know and I'll try to explain myself better. Thanks!
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TfGuy44
Re: Determine Class Position in Array from within
Reply #1 - Feb 24th, 2010, 7:53am  
Quote:
myObject[] group = new myObject[100];

void setup() {
  for(int i = 0; i < group.length; i++) {
    group[i] = new myObject(i);
  }
}

void draw() {
  for(int i = 0; i < group.length; i++) {
    group[i].update();
  }
}

class myObject {
  int myIndex;
  myObject(int newIndex) {
    // Constructor Information
    myIndex = newIndex;
  }

  void update() {
    // Print the position of this object
    // in the array group.
    println( myIndex );
  }
}



Works fine. Two other small changes:
- Processing thinks "Object" is a keyword. Don't use it for your own class name.
- When you define a class, use the keyword "class", not "Class". Lowercase 'c'.
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jonobrone
Re: Determine Class Position in Array from within
Reply #2 - Feb 24th, 2010, 8:06am  
Of course! Thanks so much for the quick response. I don't know why I hadn't thought of passing the iterator into the constructor...
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