How to use

getGraphics

method

in

processing.core.PApplet

/** Danger: available for advanced subclassing, but here be dragons. */
protected void showSurface() {
 if (getGraphics().displayable()) {
  surface.setVisible(true);
 }
}

public PGraphicsOpenGL getGraphics() {
  
  if(this.isDrawingOnDisplay){
    return (PGraphicsOpenGL) parent.getGraphics();
  }
  
  if (thisGraphics == null) {
    thisGraphics = (PGraphicsOpenGL) parent.createGraphics(
        this.getRenderingSizeX(),
        this.getRenderingSizeY(),
        PApplet.P3D);
  }
  return thisGraphics;
}