[Processing 2.0] Create Transparent Window [Java, Frame]

transparentWindow.java

/**
 * Author: Tim Pulver
 * Date: 2013
 * Tested with Processing 2.0
 * original code by jungalero (processing.org forum)
 */

import java.awt.AWTException;
import java.awt.Robot;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.awt.GraphicsEnvironment;
import java.awt.GraphicsDevice;
import java.awt.DisplayMode;
 
PImage screenShot;
 
int W = 400; // width
int H = 400; // height
int X = 0; // x-position of the window
int Y = 0; // y-position of the window
int XOFF = 0;    // x-offset = distance to the right screen boarder
int YOFF = 100;  // y-offset = distance to the top screen boarder
 
void setup() {
  // if the window should be fullscreen uncomment this
  //W = displayWidth;
  //H = displayHeight;
  size(W, H);  
  screenShot = getScreen(X, Y, W, H);
  initFrame();
}
 
/**
 * Removes the windowboarder
 */
void initFrame(){
  frame.removeNotify();
  frame.setUndecorated(true);
  frame.addNotify();
}
 
void draw () {
  frame.setLocation(X, Y);
  image(screenShot,0,0, width, height);
  // draw something to see the window
  fill(0);
  ellipse(width/2, height/2, 200, 200);
}
 
/**
 * Returns an image of the screen (full)
 */
PImage getFullscreen(){
  return getScreen(0, 0, displayWidth, displayHeight);
}
 
/**
 * Returns an area of the screen (screenshot)
 * @param x Top-Left corner of the area to copy (x)
 * @param y Top Left corner of the area to copy (y)
 * @param w Width of the rectangle
 * @param h Height of the rectangle
 */
PImage getScreen(int x, int y, int w, int h) {
  GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
  GraphicsDevice[] gs = ge.getScreenDevices();
  DisplayMode mode = gs[0].getDisplayMode();
  Rectangle bounds = new Rectangle(x, y, w, h);
  BufferedImage desktop = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
 
  try {
    desktop = new Robot(gs[0]).createScreenCapture(bounds);
  }
  catch(AWTException e) {
    System.err.println("Screen capture failed.");
  }
  return (new PImage(desktop));
}