I am trying to add function plotting to my Java Swing application. From my main app window I want to launch a JDialog with a simple JLabel = "f(x) = " and a JTextField, where user would be asked to enter their own function they want to plot.
I am trying to adapt the demo sample included so that I could redirect the text from JTextField to this class, but I literally got stuck - no ideas on how to do that.
Here's the code for the class that shows the graph:
class OknoFunkcji extends ApplicationFrame {
public OknoFunkcji(String title) {
super(title);
JPanel chartPanel = createDemoPanel();
chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
setContentPane(chartPanel);
}
/**
* Creates a chart.
*
* @param dataset
*
* @return returns chart instance
*/
private static JFreeChart createChart(XYDataset dataset) {
// create the chart...
JFreeChart chart = ChartFactory.createXYLineChart(
"OknoFunkcji ", // chart title
"X", // x axis label
"Y", // y axis label
dataset, // data
PlotOrientation.VERTICAL,
true, // include legend
true, // tooltips
false // urls
);
XYPlot plot = (XYPlot) chart.getPlot();
plot.getDomainAxis().setLowerMargin(0.0);
plot.getDomainAxis().setUpperMargin(0.0);
return chart;
}
/**
* Creates a sample dataset.
*
* @return A sample dataset.
*/
public static XYDataset createDataset() {
XYDataset result = DatasetUtilities.sampleFunction2D(new X2(),
-10.0, 10.0, 40, "f(x)");
return result;
}
public static JPanel createDemoPanel() {
JFreeChart chart = createChart(createDataset());
return new ChartPanel(chart);
}
static class X2 implements Function2D {
public double getValue(double x) {
return x * x + 2;
}
}
}
How can I alter the getValue method so it uses user-defined function? Here's my JDialog code:
class PanelFunkcji extends JDialog implements ActionListener {
private JLabel lFunkcja;
private JTextField tFunkcja;
private JButton bOK, bCancel;
public PanelFunkcji(JFrame owner) {
super(owner, "Wprowadzanie funkcji", true);
setSize(250,120);
setLayout(null);
lFunkcja = new JLabel("f(x) = ");
lFunkcja.setBounds(10, 10, 100, 20);
add(lFunkcja);
tFunkcja = new JTextField();
tFunkcja.setBounds(40, 10, 180, 20);
add(tFunkcja);
bOK = new JButton("OK");
bOK.setBounds(10, 40, 100, 20);
add(bOK);
bOK.addActionListener(this);
bCancel = new JButton("Anuluj");
bCancel.setBounds(120, 40, 100, 20);
add(bCancel);
bCancel.addActionListener(this);
}
@Override
public void actionPerformed(ActionEvent e) {
Object z = e.getSource();
if(z == bOK) {
//TO-DO: Send the function from tFunkcja to the plotter
setVisible(false);
}
else if (z == bCancel) {
setVisible(false);
}
}
}
Sorry for some strings or comments in Polish, hope it isn't much of a problem to you. I would really appreciate any help with this, as I need it for like yesterday and I do not really have time to learn it as I would normally do.
