Adjustments to OSX pie demo

ChartsDemo-OSX/ChartsDemo-OSX/ViewController.swift

@@ -135,12 +135,24 @@ class PieDemoViewController: NSViewController
 
 		let data = PieChartData(xVals: xs)
 		let ds1 = PieChartDataSet(yVals: yse1, label: "Hello")
-		ds1.colors = [NSUIColor.redColor(), NSUIColor.blueColor(), NSUIColor.greenColor(), NSUIColor.orangeColor(), NSUIColor.grayColor()]
-		data.addDataSet(ds1)
-
-		self.pieChartView.data = data
-	}
-
+
+		ds1.colors = ChartColorTemplates.vordiplom()
+
+        data.addDataSet(ds1)
+
+        let paragraphStyle: NSMutableParagraphStyle = NSParagraphStyle.defaultParagraphStyle().mutableCopy() as! NSMutableParagraphStyle
+        paragraphStyle.lineBreakMode = .ByTruncatingTail
+        paragraphStyle.alignment = .Center
+        let centerText: NSMutableAttributedString = NSMutableAttributedString(string: "iOS Charts\nby Daniel Cohen Gindi")
+        centerText.setAttributes([NSFontAttributeName: NSFont(name: "HelveticaNeue-Light", size: 15.0)!, NSParagraphStyleAttributeName: paragraphStyle], range: NSMakeRange(0, centerText.length))
+        centerText.addAttributes([NSFontAttributeName: NSFont(name: "HelveticaNeue-Light", size: 13.0)!, NSForegroundColorAttributeName: NSColor.grayColor()], range: NSMakeRange(10, centerText.length - 10))
+        centerText.addAttributes([NSFontAttributeName: NSFont(name: "HelveticaNeue-LightItalic", size: 13.0)!, NSForegroundColorAttributeName: NSColor(red: 51 / 255.0, green: 181 / 255.0, blue: 229 / 255.0, alpha: 1.0)], range: NSMakeRange(centerText.length - 19, 19))
+
+        self.pieChartView.centerAttributedText = centerText
+
+        self.pieChartView.data = data
+    }
+
 	override func viewWillAppear()
     {
 		self.pieChartView.animate(xAxisDuration: 0.0, yAxisDuration: 1.0)