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VCAFE.3.0A
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Click3.java
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1998-09-15
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import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/**
* The final version of the Click applet adds some additional logic
* to make a pathetic little game out of the parts we've assembled.
* Note that we've made a significant change to the TargetListener
* class: it's no longer static. As an ordinary nested class it has
* access to the currentTarget field which it writes each time the
* mouse enters or exits a target. The MouseListener called shootTarget
* reads this field when the user clicks the mouse.
*
* This applet runs correctly in HotJava, it requires JDK 1.1.
*/
public class Click3 extends Applet
{
Color puckColor = new Color(200, 0, 10);
Box puck = new Box(puckColor);
ColumnOfBoxes[] targets = new ColumnOfBoxes[8];
ColumnOfBoxes currentTarget;
private final class TargetListener
extends MouseAdapter implements MouseMotionListener
{
private Color newBackground;
private Color oldBackground;
TargetListener(Color newBackground) {
this.newBackground = newBackground;
}
public void mouseEntered(MouseEvent e) {
oldBackground = e.getComponent().getBackground();
e.getComponent().setBackground(newBackground);
currentTarget = (ColumnOfBoxes)(e.getComponent());
}
public void mouseExited(MouseEvent e) {
e.getComponent().setBackground(oldBackground);
currentTarget = null;
}
private void redispatch(MouseEvent e) {
Point origin = e.getComponent().getLocation();
e.translatePoint(origin.x, origin.y);
e.getComponent().getParent().dispatchEvent(e);
}
public void mouseMoved(MouseEvent e) { redispatch(e); }
public void mouseDragged(MouseEvent e) { redispatch(e); }
public void mouseClicked(MouseEvent e) { redispatch(e); }
}
public Click3()
{
MouseMotionListener movePuck = new MouseMotionAdapter() {
public void mouseMoved(MouseEvent e)
{
int x = e.getX() - (puck.getSize().width / 2);
int y = getSize().height - puck.getSize().height;
puck.setLocation(x, y);
}
};
MouseListener shootTarget = new MouseAdapter() {
public void mouseClicked(MouseEvent e)
{
if (currentTarget != null) {
int nBoxes = currentTarget.getComponentCount();
if (nBoxes == e.getClickCount()) {
currentTarget.removeAll();
currentTarget.getToolkit().beep();
currentTarget.repaint();
}
}
}
};
for(int i = 0; i < targets.length; i++) {
int nBoxes = 1 + (int)(Math.random() * 4.0);
float boxHue = (float)i / (float)targets.length;
Color boxColor = Color.getHSBColor(boxHue, 0.5f, 0.85f);
TargetListener tl = new TargetListener(boxColor.brighter());
targets[i] = new ColumnOfBoxes(boxColor, nBoxes);
targets[i].addMouseListener(tl);
targets[i].addMouseMotionListener(tl);
add(targets[i]);
}
add(puck);
addMouseMotionListener(movePuck);
addMouseListener(shootTarget);
}
public static void main(String[] args)
{
WindowListener l = new WindowAdapter()
{
public void windowClosing(WindowEvent e) {System.exit(0);}
};
Frame f = new Frame("Click");
f.addWindowListener(l);
f.add(new Click3());
f.setSize(600, 400);
f.show();
}
}