improve text rendering

Change-Id: Idf2b0129f9d72739e934c65ccf40acf0b3000a5a

chart2/source/view/charttypes/GL3DBarChart.cxx

@@ -50,7 +50,7 @@ const float TEXT_HEIGHT = 15.0f;
 
 float calculateTextWidth(const OUString& rText)
 {
-    return rText.getLength() * 7.5;
+    return rText.getLength() * 10;
 }
 
 }