--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/org/dive4elements/river/client/client/ui/chart/MousePositionPanel.java	Thu Apr 25 12:31:32 2013 +0200
@@ -0,0 +1,137 @@
+package de.intevation.flys.client.client.ui.chart;
+
+import java.util.ArrayList;
+
+import com.smartgwt.client.widgets.Canvas;
+import com.smartgwt.client.widgets.Label;
+import com.smartgwt.client.widgets.layout.HLayout;
+import com.smartgwt.client.widgets.events.MouseMoveEvent;
+import com.smartgwt.client.widgets.events.MouseMoveHandler;
+
+import de.intevation.flys.client.shared.Transform2D;
+
+
+/**
+ * Panel showing the mouse position in data space.
+ * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
+ */
+public class MousePositionPanel extends HLayout implements MouseMoveHandler {
+
+    /** Is associated to a ChartTab. */
+    protected ChartOutputTab chartTab;
+
+    protected HLayout xLayout;
+    protected ArrayList<HLayout> yLayouts;
+
+
+    public MousePositionPanel(ChartOutputTab chartTab) {
+        super();
+
+        this.chartTab = chartTab;
+
+        chartTab.getChartPanel().addMouseMoveHandler(this);
+
+        initLayout();
+    }
+
+
+    /**
+     * Initializes the layout of this component. <b>Note:</b> This layout has a
+     * fixed width of 195px plus a margin of 5px.
+     */
+    protected void initLayout() {
+        setMembersMargin(5);
+
+        xLayout = null;
+        yLayouts = new ArrayList<HLayout>();
+    }
+
+
+    /**
+     * Listens to mouse move events to refresh the xy position.
+     *
+     * @param event The move event.
+     */
+    public void onMouseMove(MouseMoveEvent event) {
+        updateMousePosition(event.getX(), event.getY());
+    }
+
+
+    /**
+     * This method takes pixel coordinates, transforms those values into chart
+     * coordinates using the Transform2D class and updates the mouse position.
+     *
+     * @param x The x part of the pixel.
+     * @param y The y part of the pixel.
+     */
+    public void updateMousePosition(double x, double y) {
+        int transformerCount = chartTab.getTransformerCount();
+
+        Canvas chart = chartTab.getChartPanel();
+        int xOffset = chart.getPageLeft();
+        int yOffset = chart.getPageTop();
+
+        x = x - xOffset;
+        y = y - yOffset;
+
+        // Create Layout for x coordinates.
+        if (xLayout == null){
+            Label xDesc  = new Label("Position: X = ");
+            Label xLabel = new Label();
+            xLayout      = new HLayout();
+            xLayout.setWidth(125);
+            xLayout.addMember(xDesc);
+            xLayout.addMember(xLabel);
+            xDesc.setWidth(70);
+            xLabel.setWidth(55);
+            addMember(xLayout);
+        }
+
+        for (int i = 0; i < transformerCount; i++) {
+            HLayout yLayout = null;
+            // If no layout exists for this y axis, create one.
+            // else use the existing one.
+            if (yLayouts.size() <= i) {
+                Label yDesc     = new Label("Y" + (i+1) + " = ");
+                Label yLabel    = new Label();
+                yLayout = new HLayout();
+                yLayout.setWidth(80);
+                yLayout.addMember(yDesc);
+                yLayout.addMember(yLabel);
+                yDesc.setWidth(30);
+                yLabel.setWidth(50);
+                addMember(yLayout);
+                yLayouts.add(i, yLayout);
+            }
+            else {
+                yLayout = yLayouts.get(i);
+            }
+
+            Transform2D transformer = chartTab.getTransformer(i);
+
+            if (transformer == null) {
+                return;
+            }
+
+            // Get the label for the coordinates.
+            Canvas xLabel = xLayout.getMember(1);
+            Canvas yLabel = yLayout.getMember(1);
+
+            double[] xy    = transformer.transform(x, y);
+            String[] xyStr = transformer.format(new Number[] {
+                new Double(xy[0]), new Double(xy[1]) });
+            // Set the coordinates.
+            xLabel.setContents(xyStr[0]);
+            yLabel.setContents(xyStr[1]);
+        }
+
+        // Remove y coordinates.
+        if (yLayouts.size() > transformerCount) {
+            for (int i = yLayouts.size() - 1; i >= transformerCount; i--) {
+                removeMember(yLayouts.get(i));
+                yLayouts.remove(i);
+            }
+        }
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :