Beginners drawing - Java-Gaming.org

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 = 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 != null)
sprites.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);
}

}

- Craig