From a3abb19e5042eff05b84ff7dfd4b74fd013514fb Mon Sep 17 00:00:00 2001
From: Andreas Buchen <andreas.buchen@gmail.com>
Date: Mon, 25 May 2015 18:54:05 +0200
Subject: [PATCH] Draw zero lines in volatility / returns diagram

Issue: #292
---
 .../ui/views/ReturnsVolatilityChartView.java  | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/name.abuchen.portfolio.ui/src/name/abuchen/portfolio/ui/views/ReturnsVolatilityChartView.java b/name.abuchen.portfolio.ui/src/name/abuchen/portfolio/ui/views/ReturnsVolatilityChartView.java
index bc15e1066d..2a13d69fa9 100644
--- a/name.abuchen.portfolio.ui/src/name/abuchen/portfolio/ui/views/ReturnsVolatilityChartView.java
+++ b/name.abuchen.portfolio.ui/src/name/abuchen/portfolio/ui/views/ReturnsVolatilityChartView.java
@@ -36,12 +36,15 @@
 import org.eclipse.jface.layout.GridDataFactory;
 import org.eclipse.jface.layout.GridLayoutFactory;
 import org.eclipse.swt.SWT;
+import org.eclipse.swt.events.PaintEvent;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.swt.widgets.ToolBar;
 import org.swtchart.IAxis;
+import org.swtchart.ICustomPaintListener;
 import org.swtchart.ILineSeries;
+import org.swtchart.IPlotArea;
 import org.swtchart.ISeries;
 
 public class ReturnsVolatilityChartView extends AbstractHistoricView
@@ -110,6 +113,25 @@ protected Composite createBody(Composite parent)
         yAxis.getTitle().setText(Messages.LabelPeformanceTTWROR);
         yAxis.getTick().setFormat(new DecimalFormat("0.##%")); //$NON-NLS-1$
 
+        ((IPlotArea) chart.getPlotArea()).addCustomPaintListener(new ICustomPaintListener()
+        {
+            @Override
+            public void paintControl(PaintEvent e)
+            {
+                int y = xAxis.getPixelCoordinate(0);
+                e.gc.drawLine(y, 0, y, e.height);
+
+                int x = yAxis.getPixelCoordinate(0);
+                e.gc.drawLine(0, x, e.width, x);
+            }
+
+            @Override
+            public boolean drawBehindSeries()
+            {
+                return true;
+            }
+        });
+
         picker = new ChartConfigurator(composite, this, ChartConfigurator.Mode.RETURN_VOLATILITY);
         picker.setListener(new ChartConfigurator.Listener()
         {