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Initial code check in continued
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dennis.sheirer
257
src/spectrum/SpectrumPanel.java
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257
src/spectrum/SpectrumPanel.java
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/*******************************************************************************
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* SDR Trunk
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* Copyright (C) 2014 Dennis Sheirer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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******************************************************************************/
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package spectrum;
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import java.awt.Color;
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import java.awt.Dimension;
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import java.awt.GradientPaint;
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import java.awt.Graphics;
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import java.awt.Graphics2D;
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import java.awt.Rectangle;
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import java.awt.RenderingHints;
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import java.awt.geom.GeneralPath;
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import java.awt.geom.Line2D;
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import javax.swing.JPanel;
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import settings.ColorSetting;
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import settings.ColorSetting.ColorSettingName;
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import settings.Setting;
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import settings.SettingChangeListener;
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import buffer.FloatArrayCircularAveragingBuffer;
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import controller.ResourceManager;
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public class SpectrumPanel extends JPanel
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implements DFTResultsListener,
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SettingChangeListener
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{
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private static final long serialVersionUID = 1L;
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/* Set display bins size to 1, so that we're guaranteed a reset to the
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* correct width once the first sample set arrives */
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private float[] mDisplayFFTBins = new float[ 1 ];
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private FloatArrayCircularAveragingBuffer mFFTAveragingBuffer =
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new FloatArrayCircularAveragingBuffer( 4 );
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/**
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* Spectral Display Color Settings
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*/
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private static final String sSPECTRUM_BACKGROUND = "spectrum_background";
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private static final String sSPECTRUM_GRADIENT_TOP = "spectrum_gradient_top";
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private static final String sSPECTRUM_GRADIENT_BOTTOM = "spectrum_gradient_bottom";
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private static final String sSPECTRUM_LINE = "spectrum_line";
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private static final int sSPECTRUM_TRANSLUCENCY = 128;
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private Color mColorSpectrumBackground;
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private Color mColorSpectrumGradientTop;
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private Color mColorSpectrumGradientBottom;
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private Color mColorSpectrumLine;
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private float mSpectrumInset = 20.0f;
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private ResourceManager mResourceManager;
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public SpectrumPanel( ResourceManager resourceManager )
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{
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mResourceManager = resourceManager;
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setColors();
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}
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public void dispose()
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{
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mResourceManager = null;
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}
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private void setColors()
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{
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mColorSpectrumBackground =
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getColor( ColorSettingName.SPECTRUM_BACKGROUND );
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mColorSpectrumGradientBottom =
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getColor( ColorSettingName.SPECTRUM_GRADIENT_BOTTOM );
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mColorSpectrumGradientTop =
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getColor( ColorSettingName.SPECTRUM_GRADIENT_TOP );
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mColorSpectrumLine = getColor( ColorSettingName.SPECTRUM_LINE );
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}
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private Color getColor( ColorSettingName name )
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{
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ColorSetting setting =
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mResourceManager.getSettingsManager().getColorSetting( name );
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return setting.getColor();
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}
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@Override
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public void settingChanged( Setting setting )
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{
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if( setting instanceof ColorSetting )
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{
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ColorSetting colorSetting = (ColorSetting)setting;
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switch( ( (ColorSetting) setting ).getColorSettingName() )
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{
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case SPECTRUM_BACKGROUND:
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mColorSpectrumBackground = colorSetting.getColor();
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break;
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case SPECTRUM_GRADIENT_BOTTOM:
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mColorSpectrumGradientBottom = colorSetting.getColor();
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break;
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case SPECTRUM_GRADIENT_TOP:
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mColorSpectrumGradientTop = colorSetting.getColor();
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break;
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case SPECTRUM_LINE:
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mColorSpectrumLine = colorSetting.getColor();
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break;
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}
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}
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}
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/**
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* DFTResultsListener interface method - for receiving the processed data
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* to display
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*/
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public void receive( float[] currentFFTBins )
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{
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//Construct and/or resize our fft results variables
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if( mDisplayFFTBins == null ||
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mDisplayFFTBins.length != currentFFTBins.length )
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{
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mDisplayFFTBins = new float[ currentFFTBins.length ];
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}
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/**
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* Store the new FFT bins in the buffer and get the average of the FFT
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* bin buffer contents into the display fft bins variable
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*/
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mDisplayFFTBins = mFFTAveragingBuffer.get( currentFFTBins );
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repaint();
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}
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@Override
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public void paintComponent( Graphics g )
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{
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super.paintComponent( g );
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Graphics2D graphics = (Graphics2D) g;
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graphics.setBackground( mColorSpectrumBackground );
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RenderingHints renderHints =
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new RenderingHints( RenderingHints.KEY_ANTIALIASING,
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RenderingHints.VALUE_ANTIALIAS_ON );
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renderHints.put( RenderingHints.KEY_RENDERING,
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RenderingHints.VALUE_RENDER_QUALITY );
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graphics.setRenderingHints( renderHints );
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drawSpectrum( graphics );
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}
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/**
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* Draws the current fft spectrum with a line and a gradient fill.
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*/
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private void drawSpectrum( Graphics2D graphics )
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{
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Dimension size = getSize();
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//Draw the background
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Rectangle background = new Rectangle( 0, 0, size.width, size.height );
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graphics.setColor( mColorSpectrumBackground );
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graphics.draw( background );
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graphics.fill( background );
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//Define the gradient
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GradientPaint gradient = new GradientPaint( 0,
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0,
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mColorSpectrumGradientTop,
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0,
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getSize().height,
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mColorSpectrumGradientBottom );
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graphics.setBackground( mColorSpectrumBackground );
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GeneralPath spectrumShape = new GeneralPath();
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//Start at the lower right inset point
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spectrumShape.moveTo( size.getWidth(),
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size.getHeight() - mSpectrumInset );
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//Draw to the lower left
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spectrumShape.lineTo( 0, size.getHeight() - mSpectrumInset );
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//If we have FFT data to display ...
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if( mDisplayFFTBins != null )
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{
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float insideHeight = size.height - mSpectrumInset;
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float insideWidth = size.width;
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float binSize = insideWidth / ( mDisplayFFTBins.length - 1 );
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float heightMultiplier = (float)( insideHeight * .15 );
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float spectrumMiddle = insideHeight * .23f;
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for( int x = 0; x < mDisplayFFTBins.length; x++ )
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{
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float height = spectrumMiddle - ( mDisplayFFTBins[ x ] * heightMultiplier );
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if( height > size.getHeight() - mSpectrumInset )
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{
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height = (float)size.getHeight() - mSpectrumInset;
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}
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spectrumShape.lineTo( binSize * x, height );
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}
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}
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//Otherwise show an empty spectrum
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else
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{
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//Draw Left Size
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graphics.setPaint( gradient );
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spectrumShape.lineTo( 0, size.getHeight() - mSpectrumInset );
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//Draw Middle
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spectrumShape.lineTo( size.getWidth(),
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size.getHeight() - mSpectrumInset );
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}
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//Draw Right Side
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spectrumShape.lineTo( size.getWidth(),
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size.getHeight() - mSpectrumInset );
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graphics.setPaint( gradient );
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graphics.draw( spectrumShape );
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graphics.fill( spectrumShape );
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graphics.setPaint( mColorSpectrumLine );
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//Draw the bottom line under the spectrum
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graphics.draw( new Line2D.Float( 0,
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size.height - mSpectrumInset,
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size.width,
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size.height - mSpectrumInset ) );
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}
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@Override
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public void settingDeleted( Setting setting ) {}
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}
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