added a stand alone Swing demo

xchart-demo/src/main/java/com/xeiam/xchart/standalone/SwingDemo.java

+/**
+ * Copyright 2011 - 2014 Xeiam LLC.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.xeiam.xchart.standalone;
+
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+
+import com.xeiam.xchart.XChartPanel;
+import com.xeiam.xchart.demo.charts.area.AreaChart01;
+
+/**
+ * Class showing how to integrate a chart into a Swing JFrame
+ * 
+ * @author timmolter
+ */
+public class SwingDemo extends JPanel {
+
+  /**
+   * Create the GUI and show it. For thread safety, this method should be invoked from the event dispatch thread.
+   */
+  private static void createAndShowGUI() {
+
+    // Create and set up the window.
+    JFrame frame = new JFrame("XChart Swing Demo");
+    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+    // Add content to the window.
+    JPanel chartPanel = new XChartPanel(new AreaChart01().getChart());
+    frame.add(chartPanel);
+
+    // Display the window.
+    frame.pack();
+    frame.setVisible(true);
+  }
+
+  public static void main(String[] args) {
+
+    // Schedule a job for the event dispatch thread:
+    // creating and showing this application's GUI.
+    javax.swing.SwingUtilities.invokeLater(new Runnable() {
+
+      @Override
+      public void run() {
+
+        createAndShowGUI();
+      }
+    });
+  }
+}