Add clear button to SerialPlotter

Author: WilhelmWiens

app/src/processing/app/SerialPlotter.java

@@ -41,6 +41,7 @@ public class SerialPlotter extends AbstractMonitor {
 
   private final StringBuffer messageBuffer;
   private JComboBox<String> serialRates;
+  private JButton clearButton;
   private Serial serial;
   private int serialRate, xCount;
 
@@ -255,6 +256,8 @@ public SerialPlotter(BoardPort port) {
 
     messageBuffer = new StringBuffer();
     graphs = new ArrayList<>();
+
+    clearButton.addActionListener(ae -> {graphs.clear();});
   }
 
   protected void onCreateWindow(Container mainPane) {
@@ -273,9 +276,12 @@ protected void onCreateWindow(Container mainPane) {
 
     serialRates.setMaximumSize(serialRates.getMinimumSize());
 
+	  clearButton = new JButton(tr("Clear output"));
+
     pane.add(Box.createHorizontalGlue());
     pane.add(Box.createRigidArea(new Dimension(8, 0)));
     pane.add(serialRates);
+    pane.add(clearButton);
 
     mainPane.add(pane, BorderLayout.SOUTH);
 
@@ -383,6 +389,8 @@ public void appyPreferences() {
   protected void onEnableWindow(boolean enable) {
     textField.setEnabled(enable);
     sendButton.setEnabled(enable);
+    serialRates.setEnabled(enable);
+    clearButton.setEnabled(enable);
   }
 
   private void onSerialRateChange(ActionListener listener) {