Adds capability to persist spectral display fft size and frame rate

between sessions.

src/properties/SystemProperties.java

@@ -82,12 +82,9 @@ public class SystemProperties
 		{
 			out = new FileOutputStream( propsPath.toString() );
 
-			String comments = 
-					"SDRTrunk - SDR Trunking Decoder Application Settings";
+			String comments = "SDRTrunk - SDR Trunking Decoder Application Settings";
 			
 			mProperties.store( out, comments );
-			
-			mLog.info( "saved current properties [" + propsPath.toString() + "]" );
 		}
 		catch( Exception e )
 		{

src/spectrum/DFTProcessor.java

@@ -30,6 +30,7 @@ import org.jtransforms.fft.FloatFFT_1D;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import properties.SystemProperties;
 import sample.Buffer;
 import sample.Listener;
 import sample.SampleType;
@@ -61,6 +62,8 @@ public class DFTProcessor implements Listener<ComplexBuffer>,
 	private ScheduledExecutorService mScheduler = Executors
 			.newScheduledThreadPool( 1, new NamingThreadFactory( "spectrum dft" ) );	
 	
+	public static final String FRAME_RATE_PROPERTY = "spectral.display.frame.rate";
+	
 	private DFTSize mDFTSize = DFTSize.FFT04096;
 	private DFTSize mNewDFTSize = DFTSize.FFT04096;
 	
@@ -89,7 +92,16 @@ public class DFTProcessor implements Listener<ComplexBuffer>,
 	public DFTProcessor( SampleType sampleType )
 	{
 		setSampleType( sampleType );
-		setFrameRate( 20 );
+		
+		loadSettings();
+	}
+	
+	private void loadSettings()
+	{
+		int frameRate = SystemProperties.getInstance()
+				.get( DFTProcessor.FRAME_RATE_PROPERTY, 20 );
+
+		setFrameRate( frameRate );
 	}
 	
 	public void dispose()
@@ -171,6 +183,10 @@ public class DFTProcessor implements Listener<ComplexBuffer>,
 
 		mFrameRate = framesPerSecond;
 
+		SystemProperties properties = SystemProperties.getInstance();
+		properties.set( FRAME_RATE_PROPERTY, String.valueOf( mFrameRate ) );
+		properties.save();
+
 		calculateConsumptionRate();
 
 		restart();

src/spectrum/SpectralDisplayPanel.java

@@ -55,6 +55,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import playlist.PlaylistManager;
+import properties.SystemProperties;
 import sample.Listener;
 import sample.SampleType;
 import sample.complex.ComplexBuffer;
@@ -99,8 +100,10 @@ public class SpectralDisplayPanel extends JPanel
 
 	private static DecimalFormat sCURSOR_FORMAT = new DecimalFormat( "000.00000" );
 
+	public static final String FFT_SIZE_PROPERTY = "spectral.display.dft.size";
 	public static final int NO_ZOOM = 0;
 	public static final int MAX_ZOOM = 6;
+	
 
 	private DFTSize mDFTSize = DFTSize.FFT04096;
 	private int mZoom = 0;
@@ -150,6 +153,36 @@ public class SpectralDisplayPanel extends JPanel
     	}
     	
 		init();
+		
+		loadSettings();
+    }
+    
+    private void loadSettings()
+    {
+    	SystemProperties properties = SystemProperties.getInstance();
+    	
+    	String rawSize = properties.get( FFT_SIZE_PROPERTY, DFTSize.FFT04096.name() );
+    	
+		DFTSize size = null;
+
+		if( rawSize != null )
+    	{
+    		try
+    		{
+    			size = DFTSize.valueOf( rawSize );
+    		}
+    		catch( Exception e )
+    		{
+    			//Do nothing, we couldn't parse the stored value
+    		}
+    	}
+		
+		if( size == null )
+		{
+			size = DFTSize.FFT04096;
+		}
+		
+		setDFTSize( size );
     }
     
     public void dispose()
@@ -194,6 +227,10 @@ public class SpectralDisplayPanel extends JPanel
 		mDFTProcessor.setDFTSize( size );
 		mOverlayPanel.setDFTSize( size );
 		mDFTSize = size;
+		
+		SystemProperties properties = SystemProperties.getInstance();
+		properties.set( FFT_SIZE_PROPERTY, size.name() );
+		properties.save();
 
 		setZoom( 0, 0, 0 );
 	}

src/spectrum/WaterfallPanel.java

@@ -121,6 +121,8 @@ public class WaterfallPanel extends JPanel implements DFTResultsListener,
         mMemoryImageSource.setAnimated( true );
 
         mWaterfallImage = createImage( mMemoryImageSource );
+        
+        repaint();
 	}
 	
 	/**