--- a/gnv-artifacts/src/main/java/de/intevation/gnv/exports/ChartExportHelper.java	Tue May 25 13:57:48 2010 +0000
+++ b/gnv-artifacts/src/main/java/de/intevation/gnv/exports/ChartExportHelper.java	Tue May 25 15:41:31 2010 +0000
@@ -9,6 +9,8 @@
 import com.lowagie.text.pdf.PdfTemplate;
 import com.lowagie.text.pdf.PdfWriter;
 
+import de.intevation.artifacts.CallContext;
+
 import de.intevation.artifactdatabase.XMLUtils;
 
 import de.intevation.gnv.chart.Chart;
@@ -237,17 +239,50 @@
         float        marginLeft,
         float        marginRight,
         float        marginTop,
-        float        marginBottom
+        float        marginBottom,
+        CallContext  context
     ) {
         log.info("export chart as pdf.");
 
         if (pageFormat == null)
             pageFormat = DEFAULT_PAGE_SIZE;
 
+        // max size of the chart
         Rectangle page = PageSize.getRectangle(pageFormat);
         int pageWidth  = (int) (page.getRight(marginRight) - page.getLeft(marginLeft));
         int pageHeight = (int) (page.getTop(marginTop) - page.getBottom(marginBottom));
 
+        // the chart width
+        int chartWidth  = (Integer) context.getContextValue("chart.width");
+        int chartHeight = (Integer) context.getContextValue("chart.height");
+
+        int width  = 0;
+        int height = 0;
+        if (landscape) {
+            width  = pageHeight;
+            height = pageWidth;
+        }
+        else {
+            width  = pageWidth;
+            height = pageHeight;
+        }
+
+        if (chartWidth > width) {
+            log.warn("Width of the chart is too big for pdf -> resize it now.");
+            double ratio = ((double)width) / chartWidth;
+            chartWidth  *= ratio;
+            chartHeight *= ratio;
+            log.debug("Resized chart to " + chartWidth + "x" + chartHeight);
+        }
+
+        if (chartHeight > height) {
+            log.warn("Height of the chart is too big for pdf -> resize it now.");
+            double ratio = ((double)height) / chartHeight;
+            chartWidth  *= ratio;
+            chartHeight *= ratio;
+            log.debug("Resized chart to " + chartWidth + "x" + chartHeight);
+        }
+
         Document document = null;
         if (landscape) {
             document = new Document(page.rotate());
@@ -265,20 +300,10 @@
 
             PdfContentByte content  = writer.getDirectContent();
 
-            int width  = 0;
-            int height = 0;
-            if (landscape) {
-                width  = pageHeight;
-                height = pageWidth;
-            }
-            else {
-                width  = pageWidth;
-                height = pageHeight;
-            }
-
             PdfTemplate template = content.createTemplate(width, height);
             Graphics2D  graphics = template.createGraphics(width, height);
-            Rectangle2D area = new Rectangle2D.Double(0.0D, 0.0D,width,height);
+            Rectangle2D area = new Rectangle2D.Double(
+                0.0D, 0.0D, chartWidth, chartHeight);
 
             chart.draw(graphics, area);
             graphics.dispose();