processing のキャンバス上に swing コンポネーションを配置してみた。つhttp://d.hatena.ne.jp/alpha_neet/20111127/1322395351

swing_for_processing.scala

object Main {
  def createGUI(width: Int, height: Int) {
    val frame  = new javax.swing.JFrame("hoge")
    val swing  = new Swing
    val dim    = new java.awt.Dimension(width, height)    
    val applet = new PApplet(swing, width, height)

    swing.setOpaque(false)
    swing.setPreferredSize(dim)
    swing.setLayout(null)
    
    applet.init()
    applet.setPreferredSize(dim)
    applet.add(swing)
    
    frame.getContentPane.add(applet)    
    frame.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE)    
    frame.setResizable(false)
    frame.pack()
    frame.setVisible(true)
  }
  
  def main(args: Array[String]) =
    javax.swing.SwingUtilities.invokeLater(
      new Runnable() { def run() = createGUI(400, 300) }
    )
}

class Swing extends javax.swing.JPanel {
  swing =>
 
  import java.awt.Graphics
  import javax.swing.{
    JTextField,
    JComponent
  }

  val components = scala.collection.mutable.ArrayBuffer[Component]()

  trait Component extends JComponent {    
    swing.components += this
    swing.add(this)

    override def paintComponent(g: Graphics) = super.paintComponent(g)
    override def paint(g: Graphics) = paintComponent(g)
  }
 
  class TextField extends JTextField with Component
}

class PApplet(val swing: Swing, width: Int, height: Int) extends processing.core.PApplet {
  import processing.core.PConstants

  val text = new swing.TextField {
    import java.awt.event._
    
    setBounds(50, 150, 250, 20)

    // Enter を押したらテキスト表示する
    addActionListener(new ActionListener() {
      override def actionPerformed(e: ActionEvent) {
        println(getText)
      }
    })
  }

  override def setup() {
    size(width, height, PConstants.P2D)
    frameRate(24)
  }

  override def draw() {
    background(255, 0, 0)
  }

  override def paint(screen: java.awt.Graphics) {
    super.paint(screen)
    swing.paint(screen)
  }
}