Java Reference
In-Depth Information
Figure 9. Code segment for KeyBoardBehavior.java
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public class KeyBoardBehaviour extends Applet
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{
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private static final int
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UP = KeyEvent.VK_UP, DOWN = KeyEvent.VK_DOWN, LEFT = KeyEvent.VK_LEFT,
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RIGHT = KeyEvent.VK_RIGHT, MOVEUP = KeyEvent.VK_W, MOVEDWN = KeyEvent.VK_S,
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MOVERGT = KeyEvent.VK_D, MOVELEFT = KeyEvent.VK_A;
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private WakeupCriterion events[] = new WakeupCriterion[1];
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private WakeupOr allEvents;
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public class SimpleBehavior extends Behavior
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{
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private TransformGroup targetTG;
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private Transform3D tempRotation = new Transform3D();
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private Transform3D rotation = new Transform3D();
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private Transform3D trans = new Transform3D();
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private double anglex = 0.0, angley = 0.0, TransX = 0.0, TransY = 0.0;
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SimpleBehavior(TransformGroup targetTG) this.targetTG = targetTG;
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public void initialize()
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{
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events[0]=new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED);
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this.wakeupOn(new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED));
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allEvents=new WakeupOr(events);
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wakeupOn(allEvents);
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}
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public void processStimulus(Enumeration criteria)
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{
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WakeupCriterion wakeup; AWTEvent[] event ;
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while(criteria.hasMoreElements())
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{
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wakeup = (WakeupCriterion) criteria.nextElement();
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if(wakeup instanceof WakeupOnAWTEvent)
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{
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event = ((WakeupOnAWTEvent)wakeup).getAWTEvent();
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keyPressed((KeyEvent)event[0]);
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}
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}
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this.wakeupOn(allEvents);
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}
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} //end of class SimpleBehavior
and so on. Lines 12 to 56 build the MoveRight behavior class to shift the object right, and
this is initialized by a WakeupOnAWTEvent. When a key is pressed, its processStimulus
method is invoked and the object is shifted right using WakeupOnElaspedFrame. Once
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