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import java.util.Enumeration;
import javax.media.j3d.*;
import javax.vecmath.*;

// User-defined morphing behavior class
public class MorphingBehavior extends Behavior {

    Alpha alpha;
    Morph morph;
    double weights[];

    WakeupOnElapsedFrames w = new WakeupOnElapsedFrames(0);

    // Override Behavior's initialize method to setup wakeup criteria
    public void initialize() {
	alpha.setStartTime(System.currentTimeMillis());

	// Establish initial wakeup criteria
	wakeupOn(w);
    }

    // Override Behavior's stimulus method to handle the event
    public void processStimulus(Enumeration criteria) {

	// NOTE: This assumes 3 objects.  It should be generalized to
	// "n" objects.

	double val = alpha.value();
	if (val < 0.5) {
	    double a = val * 2.0;
	    weights[0] = 1.0 - a;
	    weights[1] = a;
	    weights[2] = 0.0;
	}
	else {
	    double a = (val - 0.5) * 2.0;
	    weights[0] = 0.0;
	    weights[1] = 1.0f - a;
	    weights[2] = a;
	}

	morph.setWeights(weights);

	// Set wakeup criteria for next time
	wakeupOn(w);
    }

    public MorphingBehavior(Alpha a, Morph m) {
	alpha = a;
	morph = m;
	weights = morph.getWeights();
    }
}