Setting up processing in scala

Question

Hi I'm trying to setup processing with scala and I'm getting these errors inside def main

overloaded method value add with alternatives: (x$1: java.awt.Component)java.awt.Component (x$1: java.awt.PopupMenu)Unit cannot be applied to (Demoo.Starfield)

How should I do the setup if this isn't the correct way?

package Demoo

import processing.core._

object Starfield extends PApplet {

  private var app:Starfield = _

  def main(args: Array[String]) = {
    app = new Starfield
    val frame = new javax.swing.JFrame("Starfield")
    frame.getContentPane().add(app)
    app.init
    frame.pack
    frame.setVisible(true)
  }
}

class Starfield {

  override def setup() = {}

  override def draw() = {}

}

Please read Why not upload images of code on SO when asking a question? — Rabbid76
– Rabbid76, Commented Dec 14, 2018 at 14:17

C4stor · Accepted Answer · 2018-12-14 16:24:04Z

1

Let's process the error !

overloaded method value add : the error concerns the usage of an add method. The only candidate is frame.getContentPane().add(app)

with alternatives: (x$1: java.awt.Component)java.awt.Component (x$1: java.awt.PopupMenu)Unit : this method can be called with either a Component or a PopupMenu as parameter.

cannot be applied to (Demoo.Starfield) : it was called with something else, of class Demoo.Starfield.

Indeed, the .add(app) use app as a parameter, which is of Starfield class, so it all makes sense.

So, you need to make sure that Starfield is of one of the two accepted interfaces, for example you can modify your class this way :

class Starfield extends java.awt.Component {

Disclaimer : I know absolutely nothing about java.awt, so it may not be the ideal solution.

answered Dec 14, 2018 at 16:24

C4stor

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