diff src/samer/j3d/PatchesAlpha.java @ 0:bf79fb79ee13

Initial Mercurial check in.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/samer/j3d/PatchesAlpha.java	Tue Jan 17 17:50:20 2012 +0000
@@ -0,0 +1,102 @@
+package	samer.j3d;
+
+import samer.core.types.*;
+import samer.maths.*;
+import java.util.*;
+import javax.media.j3d.*;
+import javax.vecmath.*;
+
+
+public class PatchesAlpha extends QuadArray implements Observer
+{
+	int				N;	// number of patches
+	Matrix		P;	// positions and sizes of patches
+	VVector		A;	// scalar activations
+	VDouble	K;  // scaling factor for activations
+	VDouble	L;  // scaling factor for sizes
+
+	Color4f		carray[];	// array for holding colours
+
+	public PatchesAlpha(Matrix points, VVector activities)
+	{
+		super(4*points.getRowDimension(), COORDINATES | COLOR_4);
+
+		N=points.getRowDimension();
+		P=points;
+		A=activities;
+		K=new VDouble("scale",1);
+		L=new VDouble("patch.size",1);
+
+		carray=new Color4f[4*N];
+		for (int i=0; i<4*N; i+=4) 
+			carray[i+3]=
+				carray[i+2]=
+				carray[i+1]=
+				carray[i]=new Color4f(1f,1f,1f,1f);
+
+		// set capabilities for subsequent updates
+		setCapability(ALLOW_COORDINATE_WRITE);
+		setCapability(ALLOW_COLOR_WRITE);
+
+		updatePoints();
+		updateActivities();
+
+		A.addObserver(this);
+		L.addObserver(new Observer () {
+			public void update(Observable o, Object a) {
+				updatePoints();
+			}
+		});
+	}
+
+
+	public void update(Observable o, Object a)
+	{
+		updateActivities();
+	}
+
+	private double quad[] = new double[12];
+
+	public void updatePoints()
+	{
+		// load points into point array
+		double [][] PA=P.getArray();
+		double []	row;
+		double		l=L.value;
+		int			j=0;
+
+		for (int i=0; i<N; i++) {
+			row=PA[i];
+			double x1=row[0]-l*row[1];
+			double x2=row[0]+l*row[1];
+			double y1=row[3]-l*row[4];
+			double y2=row[3]+l*row[4];
+
+			quad[0] = x1;	quad[1] = y1;	quad[2] = 0;
+			quad[3] = x1;	quad[4] = y2;	quad[5] = 0;
+			quad[6] = x2;	quad[7] = y2;	quad[8] = 0;
+			quad[9] = x2;	quad[10]= y1;	quad[11]= 0;
+
+			// set 4 vertices of quad
+			setCoordinates(j,quad,0,4); j+=4;
+
+			// choose color according to energy?
+			// carray[i].set(Color.getHSBColor((float)(row[3]*0.3)+0.16f,1f,1f));
+		}
+	}
+
+	public void updateActivities()
+	{
+		// load colours
+		double []	a=A.array();
+		double		k=K.value;
+		int			j=0;
+
+		for (int i=0; i<N; i++) {
+			float ai=(float)(a[i]*k);
+			carray[j].w = ai; j+=4;
+		}
+		setColors(0,carray);
+	}
+}
+