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 PatchArray extends QuadArray implements Observer
samer@0: {
samer@0: 	int			N;	// number of patches
samer@0: 	Matrix		P;	// positions and sizes of patches
samer@0: 	VVector		A;	// scalar activations
samer@0: 	VDouble		K;  // scaling factor for activations
samer@0: 	VDouble		L;  // scaling factor for sizes
samer@0: 
samer@0: 	float		carray[];	// array for holding colours
samer@0: 
samer@0: 	public PatchArray(Matrix points, VVector activities)
samer@0: 	{
samer@0: 		super(4*points.getRowDimension(), COORDINATES | COLOR_3);
samer@0: 
samer@0: 		N=points.getRowDimension();
samer@0: 		P=points;
samer@0: 		A=activities;
samer@0: 		K=new VDouble("scale",1);
samer@0: 		L=new VDouble("patch.size",1);
samer@0: 
samer@0: 		carray=new float[4*3*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: 		updatePoints();
samer@0: 		updateActivities();
samer@0: 
samer@0: 		A.addObserver(this);
samer@0: 		L.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: 	private double quad[] = new double[12];
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: 		double		l=L.value;
samer@0: 		int			j=0;
samer@0: 
samer@0: 		for (int i=0; i<N; i++) {
samer@0: 			row=PA[i];
samer@0: 			double x1=row[0]-l*row[1];
samer@0: 			double x2=row[0]+l*row[1];
samer@0: 			double y1=row[3]-l*row[4];
samer@0: 			double y2=row[3]+l*row[4];
samer@0: 
samer@0: 			quad[0] = x1;	quad[1] = y1;	quad[2] = 0;
samer@0: 			quad[3] = x1;	quad[4] = y2;	quad[5] = 0;
samer@0: 			quad[6] = x2;	quad[7] = y2;	quad[8] = 0;
samer@0: 			quad[9] = x2;	quad[10]= y1;	quad[11]= 0;
samer@0: 
samer@0: 			// set 4 vertices of quad
samer@0: 			setCoordinates(j,quad,0,4); j+=4;
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: 		int			j=0;
samer@0: 
samer@0: 		for (int i=0; i<N; i++) {
samer@0: 			float ai=(float)(a[i]*k);
samer@0: 
samer@0: 			carray[j]=ai; carray[j+1]=ai;	carray[j+2]=ai; j+=3;
samer@0: 			carray[j]=ai; carray[j+1]=ai;	carray[j+2]=ai; j+=3;
samer@0: 			carray[j]=ai; carray[j+1]=ai;	carray[j+2]=ai; j+=3;
samer@0: 			carray[j]=ai; carray[j+1]=ai;	carray[j+2]=ai; j+=3;
samer@0: 		}
samer@0: 		setColors(0,carray);
samer@0: 	}
samer@0: }
samer@0: