--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/exports/XYChartGenerator.java	Fri Apr 29 10:13:24 2011 +0000
@@ -0,0 +1,98 @@
+package de.intevation.flys.exports;
+
+import java.awt.Color;
+
+import java.io.IOException;
+
+import org.apache.log4j.Logger;
+
+import org.jfree.chart.ChartFactory;
+import org.jfree.chart.JFreeChart;
+import org.jfree.chart.axis.NumberAxis;
+import org.jfree.chart.plot.PlotOrientation;
+import org.jfree.chart.plot.XYPlot;
+import org.jfree.data.xy.XYDataset;
+
+import de.intevation.flys.exports.ChartExportHelper;
+
+
+/**
+ * An abstract base class for creating XY charts.
+ *
+ * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
+ */
+public abstract class XYChartGenerator extends ChartGenerator {
+
+    /** The logger that is used in this generator.*/
+    private static Logger logger = Logger.getLogger(ChartGenerator.class);
+
+
+    /**
+     * Returns the title of a chart.
+     *
+     * @return the title of a chart.
+     */
+    protected abstract String getChartTitle();
+
+    /**
+     * Returns the X-Axis label of a chart.
+     *
+     * @return the X-Axis label of a chart.
+     */
+    protected abstract String getXAxisLabel();
+
+    /**
+     * Returns the Y-Axis label of a chart.
+     *
+     * @return the Y-Axis label of a chart.
+     */
+    protected abstract String getYAxisLabel();
+
+    /**
+     * Returns the XYDataset used to add curves to the chart.
+     *
+     * @return the XYDataset used to add curves to the chart.
+     */
+    protected abstract XYDataset getXYDataset();
+
+
+    public void generate()
+    throws IOException
+    {
+        logger.debug("XYChartGenerator.generate");
+
+        JFreeChart chart = ChartFactory.createXYLineChart(
+            getChartTitle(),
+            getXAxisLabel(),
+            getYAxisLabel(),
+            getXYDataset(),
+            PlotOrientation.VERTICAL,
+            true,
+            false,
+            false);
+
+        chart.setBackgroundPaint(Color.WHITE);
+        chart.getPlot().setBackgroundPaint(Color.WHITE);
+
+        adjustAxes((XYPlot) chart.getPlot());
+
+        ChartExportHelper.exportImage(
+            out,
+            chart,
+            "png",
+            600, 400);
+    }
+
+
+    /**
+     * Adjusts the axes of a plot.
+     *
+     * @param plot The XYPlot of the chart.
+     */
+    protected void adjustAxes(XYPlot plot) {
+        NumberAxis yAxis = (NumberAxis) plot.getRangeAxis();
+
+        yAxis.setAutoRangeIncludesZero(false);
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :