Add new default style.

script/features/draw_graph/model/BackgroundStyle.js

@@ -0,0 +1,41 @@
+/**
+ * Graph drawer.
+ */
+ 
+ 
+function CommonBackgroundStyle()
+{
+  BaseBackgroundStyle.apply(this, arguments);
+
+	this.commonColor   = '#ffffff';
+	this.commonOpacity = 1.0;
+  this.image = null;
+}
+
+CommonBackgroundStyle.prototype = Object.create(BaseBackgroundStyle.prototype);
+
+function PrintBackgroundStyle()
+{
+  CommonBackgroundStyle.apply(this, arguments);
+
+	this.commonColor   = '#ffffff';
+	this.commonOpacity = 1.0;
+  this.image = null;
+}
+
+PrintBackgroundStyle.prototype = Object.create(CommonBackgroundStyle.prototype);
+
+function GetWhiteBackgroundStyle()
+{
+  return new CommonBackgroundStyle();
+}
+
+function DefaultCommonBackgroundStyle()
+{
+  return GetWhiteBackgroundStyle();
+}
+
+function DefaultPrintBackgroundStyle()
+{
+  return new PrintBackgroundStyle();
+}