samer@0: package	samer.j3d;
samer@0: 
samer@0: import samer.core.types.*;
samer@0: import samer.maths.*;
samer@0: import java.util.*;
samer@0: import javax.media.j3d.*;
samer@0: import javax.vecmath.*;
samer@0: 
samer@0: 
samer@0: public class MatrixPointArrayAlpha extends PointArray implements Observer
samer@0: {
samer@0: 	int			N;	// number of points
samer@0: 	Matrix		P;	// 3d positions of points
samer@0: 	VVector		A;	// scalar activations
samer@0: 	VDouble		K;  // scaling factor for activations
samer@0: 
samer@0: 	float		carray[];	// array for holding colours
samer@0: //	Color3f		carray[];
samer@0: 
samer@0: 	public MatrixPointArrayAlpha(Matrix points, VVector activities)
samer@0: 	{
samer@0: 		super(points.getRowDimension(), COORDINATES | COLOR_4);
samer@0: 
samer@0: 		N=points.getRowDimension();
samer@0: 		P=points;
samer@0: 		A=activities;
samer@0: 		K=new VDouble("scale",1);
samer@0: 
samer@0: 		carray=new float[4*N];
samer@0: 
samer@0: 		// set capabilities for subsequent updates
samer@0: 		setCapability(ALLOW_COORDINATE_WRITE);
samer@0: 		setCapability(ALLOW_COLOR_WRITE);
samer@0: 
samer@0: 		{
samer@0: 			double [] a=A.array();
samer@0: 			for (int i=0; i<N; i++) {
samer@0: 				a[i]=1;
samer@0: 				carray[4*i]=1;
samer@0: 				carray[4*i+1]=0.8f;
samer@0: 				carray[4*i+2]=0.4f;
samer@0: 			}
samer@0: 		}
samer@0: 
samer@0: 		updatePoints();
samer@0: 		updateActivities();
samer@0: 
samer@0: 		A.addObserver(this);
samer@0: 		P.addObserver(new Observer () {
samer@0: 			public void update(Observable o, Object a) {
samer@0: 				updatePoints();
samer@0: 			}
samer@0: 		});
samer@0: 	}
samer@0: 
samer@0: 
samer@0: 	public void update(Observable o, Object a)
samer@0: 	{
samer@0: 		updateActivities();
samer@0: 	}
samer@0: 
samer@0: 	public void updatePoints()
samer@0: 	{
samer@0: 		// load points into point array
samer@0: 		double [][] PA=P.getArray();
samer@0: 		double []	row;
samer@0: 		for (int i=0; i<N; i++) {
samer@0: 			row=PA[i];
samer@0: 			setCoordinate(i,row);
samer@0: 		}
samer@0: 	}
samer@0: 
samer@0: 	public void updateActivities()
samer@0: 	{
samer@0: 		// load colours
samer@0: 		double [] a=A.array();
samer@0: 		double	  k=K.value;
samer@0: 
samer@0: 		for (int i=0, j=3; i<N; i++,j+=4) {
samer@0: 			float ai=(float)(a[i]*k);
samer@0: 			carray[j]=ai;
samer@0: 		}
samer@0: 		setColors(0,carray);
samer@0: 	}
samer@0: }