How to use

background

method

in

processing.core.PApplet

/**
* Simple signature for background hides need to call app
* @param col int
*/
public void background(int col) {
 this.app.background(col);
}

public void draw() {    
 if (requestedRecord) {
  recording = true;
  app.beginRecord(PDF, recFilename);
 }
 
 app.background(bckColor);
 state = DRAW;
 clearDrawn();    
 root.drawChildren();
 state = IDLE;
 
 if (recording) {
  app.endRecord();
  requestedRecord = false;
 }
     
 if (SHOW_DEBUG_INFO && app.frameCount % 180 == 0) {
  System.out.println("framerate: " + app.frameRate);      
  System.out.println("number of drawn widgets    : " + drawnWidgets.size());
 }
}