/* CometServerPush.java
{{IS_NOTE
Purpose:
Description:
History:
Nov 20, 2008 11:31:54 AM , Created by jumperchen
}}IS_NOTE
Copyright (C) 2008 Potix Corporation. All Rights Reserved.
{{IS_RIGHT
This program is distributed under GPL Version 3.0 in the hope that
it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.zktest.test;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;
import org.zkoss.lang.Threads;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.Desktop;
import org.zkoss.zk.ui.DesktopUnavailableException;
import org.zkoss.zk.ui.Executions;
import org.zkoss.zul.Image;
import org.zkoss.zul.Listbox;
import org.zkoss.zul.Messagebox;
/**
* @author jumperchen
*
*/
public class CometServerPush {
public static void start(Component info, Component listbox)
throws InterruptedException {
final Desktop desktop = Executions.getCurrent().getDesktop();
if (desktop.isServerPushEnabled()) {
Messagebox.show("Already started");
} else {
desktop.enableServerPush(true);
new WorkingThread(info, listbox).start();
}
}
public static void stop() throws InterruptedException {
final Desktop desktop = Executions.getCurrent().getDesktop();
if (desktop.isServerPushEnabled()) {
desktop.enableServerPush(false);
} else {
Messagebox.show("Already stopped");
}
}
private static class WorkingThread extends Thread {
private static Color colors[] = { Color.blue, Color.cyan, Color.green,
Color.magenta, Color.orange, Color.pink, Color.red,
Color.yellow, Color.lightGray, Color.white };
private Ellipse2D.Float[] ellipses;
private double esize[];
private float estroke[];
private double maxSize;
private final Desktop _desktop;
private final Component _info;
private final Listbox _listbox;
private int _width = 150;
private int _height = 150;
private WorkingThread(Component info, Component listbox) {
_desktop = info.getDesktop();
_info = info;
_listbox = (Listbox) listbox;
}
public void run() {
try {
while (true) {
if (_info.getDesktop() == null
|| !_desktop.isServerPushEnabled()) {
_desktop.enableServerPush(false);
return;
}
Executions.activate(_desktop);
try {
((Image) _info).setContent(paint());
} finally {
Executions.deactivate(_desktop);
}
Threads.sleep(1000);
}
} catch (DesktopUnavailableException ex) {
System.out.println("The server push thread interrupted");
} catch (InterruptedException e) {
System.out.println("The server push thread interrupted");
}
}
public void init(int size) {
if (size == 60)
size = 8;
else if (size == 40)
size = 12;
// an array of type Ellipse2D.Float
ellipses = new Ellipse2D.Float[size];
// a double array initialized to the length of the ellipses array
esize = new double[ellipses.length];
// a float array initialized to the length of the ellipses array
estroke = new float[ellipses.length];
}
public void getRandomXY(int i, double size, int w, int h) {
esize[i] = size;
estroke[i] = 1.0f;
double x = Math.random() * (w - (maxSize / 2));
double y = Math.random() * (h - (maxSize / 2));
ellipses[i].setFrame(x, y, size, size);
}
public BufferedImage paint() {
int size;
try {
size = Integer.parseInt(_listbox.getSelectedItem().getLabel());
} catch (NumberFormatException e) {
size = 20;
}
init(size);
// fills the ellipses array with Ellipse2D.Float objects
for (int i = 0; i < ellipses.length; i++) {
ellipses[i] = new Ellipse2D.Float();
// gets location for each ellipse with the given random size
getRandomXY(i, size * Math.random(), _width, _height);
}
BufferedImage bi = new BufferedImage(_width, _height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = bi.createGraphics();
g2.setBackground(Color.BLACK);
g2.clearRect(0, 0, _width, _height);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
// sets the color and stroke size and draws each ellipse
for (int i = 0; i < ellipses.length; i++) {
g2.setColor(colors[i % colors.length]);
g2.setStroke(new BasicStroke(estroke[i]));
g2.draw(ellipses[i]);
}
g2.dispose();
return bi;
}
}
}