Whe repaint instead of paint?

[wellas666]

A simple code from the book. Why it use applet.repaint() instead of applet.paint() in the listener?
paint() is a public method in class Dots, why I cannot do applet.paint() in which applet is an object of class Dots.

--------------------------
import java.applet.Applet;
import java.awt.*;
public class Dots extends Applet
{
private final int RADIUS = 16;

Point clickPoint = null;

public void init()
{
DotsMouseListener listener = new DotsMouseListener(this);
addMouseListener(listener);
}

public void paint(Graphics page)
{
page.setColor(Color.red);
if (clickPoint != null)
page.fillOval (clickPoint.x-RADIUS,clickPoint.y-RADIUS,RADIUS*2,RADIUS*3);
}

public void setPoint(Point point)
{
clickPoint = point;
}
}
--------------------------
import java.awt.*;
import java.awt.event.*;

public class DotsMouseListener implements MouseListener
{
private Dots applet;

public DotsMouseListener (Dots theApplet)
{
applet = theApplet;
}
public void mouseClicked (MouseEvent event)
{
Point clickPoint = event.getPoint();
applet.setPoint(clickPoint);
applet.repaint();
//applet.paint(applet);
}
public void mousePressed (MouseEvent event){}
public void mouseReleased (MouseEvent event){}
public void mouseEntered (MouseEvent event){}
public void mouseExited (MouseEvent event){}
}

 

[LFI]

Here is some discussion on the matter that you might find valuable:

http://java.sun.com/products/jfc/tsc/articles/painting/

From quickly glancing at it, I get the impression that repaint() is pretty much the same as paint(), UNLESS you provide arguments (to the repaint(...) call) which, then, allow you to "repaint()" merely a portion of a GUI.

There's more to it than that. Check out the link.

Dave


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
O Time, Strength, Cash, and Patience!

 

[wellas666]

Thank you very much. I am reading it.