set graph background colour to white by default

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@887 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/userinterface/graph/DisplaySettings.java

@@ -39,7 +39,9 @@ import settings.SettingException;
 import settings.SettingOwner;
 
 import java.awt.*;
-
+
+import javax.swing.UIManager;
+
 /**
  * Representation of the display settings of a Graph.
  * The settings are propagated to the JFreeChart library.
@@ -68,11 +70,12 @@ public class DisplaySettings extends Observable implements SettingOwner
 		this.plot = chart.getXYPlot();
 		
 		antiAlias = new BooleanSetting("anti-aliasing", new Boolean(true), "Should the graph be rendered using anti-aliasing?", this, false);
+		Color defaultColor = Color.white; 
 		
-		Color defaultColor = Color.white;
-		
-		if (chart.getBackgroundPaint() instanceof Color)
-			defaultColor = ((Color)chart.getBackgroundPaint());
+		//Color defaultColor =  UIManager.getColor("Panel.background");
+		
+		//if (chart.getBackgroundPaint() instanceof Color)
+		//	defaultColor = ((Color)chart.getBackgroundPaint());
 		
 		backgroundColor = new ColorSetting("background colour", defaultColor, "The background colour of the graph panel", this, false);