Allow for nice tool tips in the plot window, so that the user at least known what hes pointing at.

src/eva2/gui/FunctionArea.java

@@ -16,6 +16,7 @@ package eva2.gui;
 import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.Graphics;
+import java.awt.Point;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.InputEvent;
@@ -83,13 +84,15 @@ public class FunctionArea extends DArea implements Serializable {
 	 *
 	 */
 	public FunctionArea() {
+		super();
+		setToolTipText("Graph Info ");
 	}
 
 	/**
 	  *
 	  */
 	public FunctionArea(String xname, String yname) {
-		super();
+		this();
 		setPreferredSize(new Dimension(600, 500));
 		setVisibleRectangle(1, 1, 100000, 1000);
 		setAutoFocus(true);
@@ -109,6 +112,30 @@ public class FunctionArea extends DArea implements Serializable {
 		notifyNegLog = true;
 	}
 
+	@Override
+	public String getToolTipText(MouseEvent event) {
+		int gIndex = getNearestGraphIndex(event.getX(), event.getY());
+		if (gIndex >= 0) {
+			StringBuffer sb = new StringBuffer(super.getToolTipText());
+			sb.append(gIndex);
+			sb.append(": ");
+			sb.append(getGraphInfo(gIndex));
+			return sb.toString();
+		} else return null;
+	}
+	
+	@Override
+	public Point getToolTipLocation(MouseEvent event) {
+		int gIndex = getNearestGraphIndex(event.getX(), event.getY());
+		if (gIndex >= 0) {
+			DPoint pt = ((GraphPointSet) (m_PointSetContainer.get(gIndex))).getMedPoint();
+			Point pt2 = getDMeasures().getPoint(pt.x, pt.y);
+			pt2.x+=(5*(gIndex%7)); // slight shift depending on index - easier distinction of very close graphs
+			pt2.y-=(10+(gIndex%3)*5);
+			return pt2;
+		} else return null;
+	}
+
 	/**
 	  *
 	  */
@@ -641,6 +668,18 @@ public class FunctionArea extends DArea implements Serializable {
 			return "none";
 	}
 
+	public String getGraphInfo(int graphIndex) {
+		String ret = "";
+		if ((m_PointSetContainer == null) || (m_PointSetContainer.size() == 0))
+			return ret;
+
+		if (graphIndex >= 0 && (graphIndex <m_PointSetContainer.size()))
+			return ((GraphPointSet) (m_PointSetContainer.get(graphIndex)))
+					.getInfoString();
+		else
+			return "none";
+	}
+	
 	/**
 	 * 
 	 * @param GraphLabel
@@ -1002,7 +1041,7 @@ public class FunctionArea extends DArea implements Serializable {
 		if (!on)
 			legendBox = null;
 		else
-			legendBox = new GraphPointSetLegend(m_PointSetContainer);
+			legendBox = new GraphPointSetLegend(m_PointSetContainer, true);
 		repaint();
 	}
 
@@ -1055,7 +1094,7 @@ public class FunctionArea extends DArea implements Serializable {
 	 * 
 	 */
 	public void updateLegend() {
-		GraphPointSetLegend lb = new GraphPointSetLegend(m_PointSetContainer);
+		GraphPointSetLegend lb = new GraphPointSetLegend(m_PointSetContainer, true);
 		setLegend(lb);
 	}
 

src/eva2/gui/GraphPointSet.java

@@ -477,7 +477,7 @@ public class GraphPointSet {
 	}
 
 	/**
-	 * Causes the PointSet to interupt the connected painting at the current
+	 * Causes the PointSet to interrupt the connected painting at the current
 	 * position.
 	 */
 	public void jump() {
@@ -568,4 +568,15 @@ public class GraphPointSet {
 		m_Stroke = stroke;
 		// setStroke(new BasicStroke( m_Stroke ));
 	}
+
+	/**
+	 * Retrieve the median point of this point set.
+	 * 
+	 * @return the median point of this point set or null if it is empty
+	 */
+	public DPoint getMedPoint() {
+		if (m_ConnectedPointSet==null) return null;
+		int medX = m_ConnectedPointSet.getSize()/2;
+		return m_ConnectedPointSet.getDPoint(medX);
+	}
 }

src/eva2/gui/GraphPointSetLegend.java

@@ -51,21 +51,34 @@ public class GraphPointSetLegend {
 
 	}
 
-	private static final PairComp comperator = new PairComp();
+	private static final PairComp comparator = new PairComp();
 
 	/**
+	 * A constructor which may enumerate the point sets.
 	 * 
-	 * @param pointSetContainer
+	 * @param pointSetContainer the set of point sets to be shown.
+	 * @param appendIndex if true, the string entries are enumerated according to the index
 	 */
-	public GraphPointSetLegend(List<GraphPointSet> pointSetContainer) {
-		legendEntries = new TreeSet<Pair<String, Color>>(comperator);
+	public GraphPointSetLegend(List<GraphPointSet> pointSetContainer, boolean appendIndex) {
+		legendEntries = new TreeSet<Pair<String, Color>>(comparator);
 		for (int i = 0; i < pointSetContainer.size(); i++) {
 			GraphPointSet pointset = pointSetContainer.get(i);
-			legendEntries.add(new Pair<String, Color>(pointset.getInfoString(),
-					pointset.getColor()));
+			String entryStr;
+			if (appendIndex) entryStr = i + ": " + pointset.getInfoString();
+			else entryStr = pointset.getInfoString();
+			legendEntries.add(new Pair<String, Color>(entryStr,pointset.getColor()));
 		}
 	}
 	
+	/**
+	 * A constructor without enumeration.
+	 * 
+	 * @param pointSetContainer the set of point sets to be shown.
+	 */
+	public GraphPointSetLegend(List<GraphPointSet> pointSetContainer) {
+		this(pointSetContainer, false);
+	}
+
 	/**
 	 * Add the legend labels to a container.
 	 *