scrolling text from top to bottom like powerpoint

I think I know what you mean. If you mean that you want the text to be animated in that it will move across the screen, then you can use a combination of a javax.swing.Timer and Graphics2D to achieve this.

In order to use Graphics2D, you should create a JPanel class and the following method inside it:

public void paintComponent( Graphics g )

{

Graphics2D g2d = (Graphics2D)g;

g.drawString( "Something", (int)x, (int)y );

}

Now, somewhere you will need to run a thread (in this case a Swing Timer works well) in order to change the values of x and y in some way that represents how you want the text to move around the screen.

A Swing Timer takes an integer argument for delay (before the execution begins) and an ActionListener (this is where you will define how x and y change). Here is an example of how the ActionLIstener might look.

public class Animation implements ActionListener

{

public void actionPerformed( ActionEvent e )

{

t += 0.01;

x = t;

y = 100*Math.sin( t ) + 150;

}

private double t = 0;

}

This code would make the text move from left to right in a sinusoidal path.

You should look at the API to make use of the rest of the Timer methods available to you.

pogaloga at 2007-7-8 9:03:57 >