Can I extend my Metaball class with theBlobDetection.Blob-Class?

vanBillstedt

I am trying to extend the Blob-class of v3ga blobDetection library but I get an error saying: implicit super constructor Blob() is undefined. must explicitly invoke another constructor

Calling super() in the constructor did not help because it says that class Blob does not have a constructor Blob(). Does anybody have experience in extending this class?

GoToLoop

AFAIK, we aren't obliged to call parent class w/ super()? :-/

class PV extends PVector {
  PV() {
    println("Hey!");
  }
}

PhiLho

It is the case when a parent class defines a constructor with parameters, but not one without parameter.

Then, a class extending it must explicitly call the super-constructor of its parent.

Example:

class Bob
{
  String goo;

  Bob(String goo)
  {
    this.goo = goo;
  }
}

class SubBob extends Bob
{
  int v;

  SubBob(String goo, int v)
  {
    this.v = v;
  }
}

void setup()
{
  SubBob sb = new SubBob("x", 42);
  println(sb.v, sb.goo);
  exit();
}

You will get this error. Solutions: if you can, add a parameterless constructor to the parent class, if it makes sense (you cannot, here), or call super(goo); at the start of the sub-class' constructor.

vanBillstedt

Thanks for your comments. It worked out calling super(parent) while parent is the blobDetection-object