Hi juddman,
Nice code examples - thank you!!!
I hacked on your DrawingBasics source to include a start/stop animation capability, as per Sun’s timer examples:
/*
- @(#)DrawingLessons.java 1.0 03/01/11
-
- You can modify the template of this file in the
- directory …\JCreator\Templates\Template_1\Project_Name.java
-
- You can also create your own project template by making a new
- folder in the directory …\JCreator\Template. Use the other
- templates as examples.
-
/
import java.awt.;
import java.awt.event.;
import javax.swing.;
import javax.swing.event.*;
class DrawingBasics extends JFrame
{
BubbleSprite[] sprites = new BubbleSprite[1000];
JmGraphicsPanel gpane = new JmGraphicsPanel();
int curFill = 0;
JPanel cp;
JButton addSpr = new JButton("Add sprite");
JButton startButton = new JButton("Start");
JButton stopButton = new JButton("Stop");
Timer timer;
boolean frozen = true; // Animation frozen?
ActionListener timedAction = new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
go();
}
};
//--------------------------------------------------------------------//
// Constructor
public DrawingBasics(int fps, String windowTitle)
{
super(windowTitle);
// Compute frame delay
int delay = (fps > 0) ? (1000 / fps) : 100; // Milliseconds
// Set up a timer that calls this object's action handler.
timer = new Timer(delay, timedAction);
timer.setInitialDelay(0); // Start up immediately
timer.setCoalesce(true); // Prevent event flooding
for (int i = 0; i < sprites.length; i++)
sprites[i] = null;
// Sprite #1
BubbleSprite tmp = new BubbleSprite( 80, 100, 30, 70);
addSprite(tmp);
// Sprite #2
tmp = new BubbleSprite( 40, 40, 80, 50);
tmp.setFillColor (Color.green);
tmp.setLineColor(Color.yellow);
addSprite(tmp);
// Sprite #3
tmp = new BubbleSprite( 45, 45, Math.random()*100, Math.random()*100);
tmp.setFillColor (Color.orange);
tmp.setLineColor(Color.magenta);
addSprite(tmp);
// Create user interface
cp = (JPanel)getContentPane();
cp.setLayout(new BorderLayout());
cp.add(gpane, BorderLayout.CENTER);
JPanel controlPanel = new JPanel();
controlPanel.setLayout( new GridLayout(1,3) ); // GridLayout (rows, cols, dx, dy)
controlPanel.add(addSpr);
controlPanel.add(startButton);
controlPanel.add(stopButton);
cp.add(controlPanel, BorderLayout.SOUTH);
gpane.setGraphicArray(sprites);
addSpr.addActionListener
(
new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
addRandomSprite();
}
}
);
startButton.addActionListener
(
new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
if (frozen)
{
frozen = false;
startButton.setEnabled(false);
stopButton.setEnabled(true);
startAnimation();
}
}
}
);
stopButton.addActionListener
(
new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
if (! frozen)
{
stopAnimation();
frozen = true;
startButton.setEnabled(true);
stopButton.setEnabled(false);
}
}
}
);
// timer.start(); // Autostart (disabled)
// Window closing listener
addWindowListener
(
new WindowAdapter()
{
public void windowDeiconified(WindowEvent e)
{
if (frozen)
{
frozen = false;
startButton.setEnabled(false);
stopButton.setEnabled(true);
startAnimation();
}
}
public void windowIconified(WindowEvent e)
{
if (! frozen)
{
stopAnimation();
frozen = true;
startButton.setEnabled(true);
stopButton.setEnabled(false);
}
}
public void windowClosing(WindowEvent e)
{
stopAnimation();
dispose();
System.exit(0);
}
}
);
}
//--------------------------------------------------------------------//
public void go()
{
for (int i=0; i<sprites.length; i++)
{
if (sprites[i] != null)
sprites[i].randomMotion();
else break;
}
//System.out.print(".");
gpane.repaint();
}
//--------------------------------------------------------------------//
// Can be invoked by any thread (since timer is thread-safe).
public synchronized void startAnimation()
{
if (frozen)
{
// Do nothing. The user has requested
// that we stop changing the image.
}
else
{
// Start animating!
if ( !timer.isRunning() )
{
timer.start();
}
}
}
//--------------------------------------------------------------------//
// Can be invoked by any thread (since timer is thread-safe).
public synchronized void stopAnimation()
{
// Stop the animating thread.
if ( timer.isRunning() )
{
timer.stop();
}
}
//--------------------------------------------------------------------//
public void addSprite(BubbleSprite in)
{
sprites[curFill] = in;
curFill ++;
}
//--------------------------------------------------------------------//
public void addRandomSprite()
{
BubbleSprite tmp = new BubbleSprite( 45, 45, Math.random()*100, Math.random()*100);
int col1 = (int)(Math.random()*255);
int col2 = (int)(Math.random()*255);
int col3 = (int)(Math.random()*255);
System.out.print ("" + col1 + col2 + col3);
tmp.setFillColor (new Color(col1, col2, col3));
tmp.setLineColor(Color.magenta);
addSprite(tmp);
}
//--------------------------------------------------------------------//
public static void main(String args[])
{
System.out.println("Starting DrawingBasics...");
int fps = 10; // 1000 ms = 1 sec so we expect 10 fps.
// Get frames per second from the command line argument.
if (args.length > 0)
{
try
{
fps = Integer.parseInt(args[0]);
}
catch (Exception e) {}
}
DrawingBasics mainFrame = new DrawingBasics(fps, "Sprite Animator");
mainFrame.setSize(400, 400);
mainFrame.setTitle("DrawingBasics");
mainFrame.setVisible(true);
}
}
