--- a/flys-client/src/main/java/de/intevation/flys/client/client/ui/chart/ChartOutputTab.java	Wed Jun 01 14:13:29 2011 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/client/ui/chart/ChartOutputTab.java	Fri Jun 03 06:34:32 2011 +0000
@@ -41,7 +41,6 @@
     public static final int THEMEPANEL_MIN_WIDTH = 200;
 
 
-
     /** The service that is used to fetch chart information.*/
     protected ChartInfoServiceAsync info = GWT.create(ChartInfoService.class);
 
@@ -62,6 +61,11 @@
     protected Canvas right;
 
 
+    /** Chart zoom options.*/
+    protected double[] xrange;
+    protected double[] yrange;
+
+
     /**
      * The default constructor to create a new ChartOutputTab.
      *
@@ -81,6 +85,8 @@
         left      = new Canvas();
         right     = new Canvas();
         tbarPanel = new ChartToolbar(collectionView, this);
+        xrange    = new double[2];
+        yrange    = new double[2];
 
         left.setBorder("1px solid black");
         left.setWidth(THEMEPANEL_MIN_WIDTH);
@@ -145,12 +151,12 @@
         double[] lower = transformer.transform(evt.getStartX(), evt.getStartY());
         double[] upper = transformer.transform(evt.getEndX(), evt.getEndY());
 
-        double xmin = lower[0];
-        double xmax = upper[0];
-        double ymin = upper[1];
-        double ymax = lower[1];
+        xrange[0] = lower[0];
+        xrange[1] = upper[0];
+        yrange[0] = upper[1];
+        yrange[1] = lower[1];
 
-        // TODO Trigger the recreation of the chart
+        updateChartPanel();
     }
 
 
@@ -193,6 +199,11 @@
     }
 
 
+    /**
+     * Returns the existing chart panel.
+     *
+     * @return the existing chart panel.
+     */
     public Canvas getChartPanel() {
         Canvas[] children = right.getChildren();
 
@@ -227,18 +238,30 @@
     }
 
 
+    /**
+     * Creates a new chart panel with default size.
+     *
+     * @return the created chart panel.
+     */
     protected Canvas createChartPanel() {
         return createChartPanel(DEFAULT_CHART_WIDTH, DEFAULT_CHART_HEIGHT);
     }
 
 
+    /**
+     * Creates a new chart panel with specified width and height.
+     *
+     * @param width The width for the chart panel.
+     * @param height The height for the chart panel.
+     *
+     * @return the created chart panel.
+     */
     protected Canvas createChartPanel(int width, int height) {
         Img chart  = getChartImg(width, height);
         chart.setWidth100();
         chart.setHeight100();
 
         return chart;
-
     }
 
 
@@ -260,6 +283,8 @@
      *
      * @param width The width of the requested chart.
      * @param height The height of the requested chart.
+     * @param xr Optional x range (used for zooming).
+     * @param yr Optional y range (used for zooming).
      *
      * @return the URL to the chart image.
      */
@@ -276,6 +301,18 @@
         imgUrl += "&width=" + Integer.toString(width);
         imgUrl += "&height=" + Integer.toString(height);
 
+        if (xrange != null) {
+            GWT.log("Zoom to xrange.");
+            imgUrl += "&minx=" + Double.toString(xrange[0]);
+            imgUrl += "&maxx=" + Double.toString(xrange[1]);
+        }
+
+        if (yrange != null) {
+            GWT.log("Zoom to xrange.");
+            imgUrl += "&miny=" + Double.toString(yrange[0]);
+            imgUrl += "&maxy=" + Double.toString(yrange[1]);
+        }
+
         return imgUrl;
     }
 }