Added methods to calc. phi at any position and for cosTheta and sinTheta

diff -u -r1.2 -r1.3
--- TrackUtils.java	29 May 2012 17:37:27 -0000	1.2
+++ TrackUtils.java	31 May 2012 06:59:47 -0000	1.3
@@ -10,7 +10,8 @@

 /**
  * 
  * @author Omar Moreno <[log in to unmask]>

- * @version $Id: TrackUtils.java,v 1.2 2012/05/29 17:37:27 omoreno Exp $

+ * @version $Id: TrackUtils.java,v 1.3 2012/05/31 06:59:47 omoreno Exp $
+ * TODO: Switch to JLab coordinates

  */
 
 public class TrackUtils {

@@ -192,4 +193,33 @@

 		
 		return new BasicHep3Vector(x, y, z);
 	}

+	
+	/**
+	 * 
+	 */
+	public double getPhi(Hep3Vector position){
+		
+		// Check if a track has been set
+		if(track == null) throw new RuntimeException("Track has not been set!");
+		
+		double x = Math.sin(this.getPhi0() - (1/this.getR())*(position.x() - this.getX0()));
+		double y = Math.cos(this.getPhi0() + (1/this.getR())*(position.y() - this.getY0()));
+	
+		return Math.atan2(x, y);
+	}
+	
+	/**
+	 * 
+	 */
+	public double getSinTheta(){
+		return 1/Math.sqrt(1 + Math.pow(this.getTanLambda(), 2));
+	}
+	
+	/**
+	 * 
+	 */
+	public double getCosTheta(){
+		return this.getTanLambda()/Math.sqrt(1 + Math.pow(this.getTanLambda(), 2));
+	}
+	

 }

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