?? mousetracker.java
字號:
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class MouseTracker extends Applet
implements MouseListener,MouseMotionListener
{
int xPos,yPos=-10;
String s="";
int d=3;
public void init()
{
addMouseListener(this);
addMouseMotionListener(this);
}
public void paint(Graphics g)
{
if(s.equals("Dragging"))
g.fillOval(xPos,yPos,d,d);
if(s.equals("Clicked"))
{
g.setColor(Color.red);
g.drawLine(xPos-d,yPos,xPos+d,yPos);
g.drawLine(xPos,yPos-d,xPos,yPos+d);
}
else g.setColor(Color.black);
}
public void update(Graphics g)
{
paint(g);
}
private void setValues(String event,int x,int y)
{
s=event;
xPos=x;
yPos=y;
repaint();
}
public void mouseClicked(MouseEvent e)
{
setValues("Clicked",e.getX(),e.getY());
}
public void mousePressed(MouseEvent e) //44
{
setValues("Pressed",e.getX(),e.getY());
}
public void mouseReleased(MouseEvent e)
{
setValues("Released",e.getX(),e.getY());
}
public void mouseEntered(MouseEvent e)
{
showStatus("Mouse in applet area");
}
public void mouseExited(MouseEvent e)
{
showStatus("Mouse outside applet area");
}
public void mouseDragged(MouseEvent e)
{
setValues("Dragging",e.getX(),e.getY());
}
public void mouseMoved(MouseEvent e)
{
setValues("Moving",e.getX(),e.getY());
}
}
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