JFreeChart select region without scaling

Question

I recently started using JFreeChart, and there is something I would like to do, but I'm not sure if this is possible. My program should draw a spectrogram (sound graph) from a wav file. Therefore, I was able to get data from my wav file in a double arraylist and display it on a diagram. But now I would like to select the area of ​​my spectrogram (with the same tool used for scaling) without scaling, and be able to play only the selected part on my sound. But I just can't find a way to succeed. Here is my code for my chart:

package classes; import java.awt.Color; import java.awt.Paint; import java.awt.Rectangle; import java.io.File; import java.io.IOException; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.Plot; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; import org.jfree.ui.RectangleInsets; public class Chart{ JFreeChart chart; Plot plot; //Constructeur de la classe Chart public Chart(double[][] bs, int channel, int framesLength, float frameRate) { // Création d'un XY chart XYSeries series = new XYSeries("XYGraph"); int i=0,j=0; float k=0; //Ajout de tous les points du tableau de 16 bytes dans le chart for( i=0; i <channel;i++) { for(j=0; j< framesLength;j++) { //Division des valeurs par 2^15 pour être entre 1 et -1 series.add(k, (bs[i][j]/32768)); //Echelle de X k+=(1/frameRate); } } // Ajoute la série au dataset XYSeriesCollection dataset = new XYSeriesCollection(); dataset.addSeries(series); // Génération du graphe chart = ChartFactory.createXYLineChart( "Ajouter titre à la fonction de génération", // Titre "Temps (s)", // Nom de l'axe X "y-axis", // Nom de l'axe Y dataset, // Dataset PlotOrientation.VERTICAL, // Plot Orientation true, // Show Legend false, // Use tooltips false // Configure chart to generate URLs? ); plot= (XYPlot) chart.getPlot(); } //Renvoie le chart public JFreeChart getChart() { return chart; } public void color(Color c) { plot.setBackgroundPaint(c); } } 

And so I call the Chart class and use it:

 Chart chartUn= new Chart(bs, channels , frameLength , frameRate); chartUn.color(Color.pink); vue.setChartPanelUn(new ChartPanel(chartUn.getChart(), false)); vue.getChartPanelUn().setRangeZoomable(false); vue.getChartPanelUn().setMouseWheelEnabled(true); 

vue.getChartPanelUn () returns a ChartPanel. Do you have idée how to solve my problem? Thank you very much (And sorry if my English is not always accurate: /)

Answer 1

Do not do this by scaling, use the MouseListener added to the ChartPanel to add the Marker axis to the Domain axis.

In this example, I have subclassed the MouseAdapter so that when you click on the mouse, the domain value is captured ( markerStart ), and when you release the update for the end of the mouse, it is updated ("markerEnd") and the marker is added to the graph ( updateMarker )

Then you will get the chart as follows:

Note that in this example, I actually turned off scaling.

 import java.awt.Color; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.geom.Point2D; import java.awt.geom.Rectangle2D; import javax.swing.JFrame; import javax.swing.JPanel; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.IntervalMarker; import org.jfree.chart.plot.Marker; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer; import org.jfree.data.xy.XYDataset; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; import org.jfree.ui.Layer; public class MouseMarkerDemo extends JFrame { public MouseMarkerDemo(String title) { super(title); JPanel chartPanel = createDemoPanel(); chartPanel.setPreferredSize(new java.awt.Dimension(500, 270)); setContentPane(chartPanel); } private final static class MouseMarker extends MouseAdapter{ private Marker marker; private Double markerStart = Double.NaN; private Double markerEnd = Double.NaN; private final XYPlot plot; private final JFreeChart chart; private final ChartPanel panel; public MouseMarker(ChartPanel panel) { this.panel = panel; this.chart = panel.getChart(); this.plot = (XYPlot) chart.getPlot(); } private void updateMarker(){ if (marker != null){ plot.removeDomainMarker(marker,Layer.BACKGROUND); } if (!( markerStart.isNaN() && markerEnd.isNaN())){ if ( markerEnd > markerStart){ marker = new IntervalMarker(markerStart, markerEnd); marker.setPaint(new Color(0xDD, 0xFF, 0xDD, 0x80)); marker.setAlpha(0.5f); plot.addDomainMarker(marker,Layer.BACKGROUND); } } } private Double getPosition(MouseEvent e){ Point2D p = panel.translateScreenToJava2D( e.getPoint()); Rectangle2D plotArea = panel.getScreenDataArea(); XYPlot plot = (XYPlot) chart.getPlot(); return plot.getDomainAxis().java2DToValue(p.getX(), plotArea, plot.getDomainAxisEdge()); } @Override public void mouseReleased(MouseEvent e) { markerEnd = getPosition(e); updateMarker(); } @Override public void mousePressed(MouseEvent e) { markerStart = getPosition(e); } } private static XYDataset createDataset() { XYSeries series1 = new XYSeries("Data"); series1.add(1.0, 1.0); series1.add(2.0, 4.0); series1.add(3.0, 3.0); series1.add(4.0, 5.0); series1.add(5.0, 5.0); series1.add(6.0, 7.0); series1.add(7.0, 7.0); series1.add(8.0, 8.0); XYSeriesCollection dataset = new XYSeriesCollection(); dataset.addSeries(series1); return dataset; } private static JFreeChart createChart(XYDataset dataset) { JFreeChart chart = ChartFactory.createXYLineChart( "Mouse Marker", "X", "Y", dataset, PlotOrientation.VERTICAL, true, true, false ); XYPlot plot = (XYPlot) chart.getPlot(); plot.setDomainPannable(true); plot.setRangePannable(true); XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) plot.getRenderer(); renderer.setBaseShapesVisible(true); renderer.setBaseShapesFilled(true); return chart; } public static JPanel createDemoPanel() { final JFreeChart chart = createChart(createDataset()); final ChartPanel panel = new ChartPanel(chart); panel.setRangeZoomable(false); panel.setDomainZoomable(false); panel.addMouseListener(new MouseMarker(panel)); return panel; } public static void main(String[] args) { MouseMarkerDemo demo = new MouseMarkerDemo("JFreeChart: MouseMarkerDemo.java"); demo.pack(); demo.setVisible(true); } }