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1
6
7 package de.progra.charting.test;
8
9
10 import de.progra.charting.*;
11 import de.progra.charting.swing.*;
12 import de.progra.charting.model.*;
13 import de.progra.charting.render.*;
14 import javax.swing.*;
15 import java.awt.*;
16 import java.awt.event.*;
17
21 public class FunctionPlotApplet extends javax.swing.JApplet  {
22
23 JTextField function = new JTextField("x^2", 20);
24 JTextField xmin = new JTextField("-10", 10);
25 JTextField xmax = new JTextField("10", 10);
26 JButton action = new JButton("Plot");
27 ChartPanel chart;
28 DefaultChartDataModel model;
29 JLabel status = new JLabel(" ");
30
31
32 public FunctionPlotApplet() {
33 initComponents();
34 }
35
36 protected void initComponents() {
37 JPanel bag = new JPanel();
38 bag.setLayout(new BorderLayout());
39
40 JPanel panel = new JPanel();
41 panel.setLayout(new GridLayout(3, 2));
42
43 panel.add(new JLabel("f(x) = "));
44 panel.add(function);
45 panel.add(new JLabel("Minimum x-value: "));
46 panel.add(xmin);
47 panel.add(new JLabel("Maximum x-value: "));
48 panel.add(xmax);
49
50 JPanel buttonPanel = new JPanel();
51 buttonPanel.add(action);
52
53 action.addActionListener(new ActionListener() {
54 public void actionPerformed(ActionEvent e) {
55 actionPressed(e);
56 }
57 });
58
59 bag.add(panel, BorderLayout.NORTH);
60 bag.add(buttonPanel, BorderLayout.WEST);
61
62 this.getContentPane().add(bag, BorderLayout.NORTH);
63
64 model = FunctionPlotter.createChartDataModelInstance(-10.0, 10.0, 2000, "x^2");
65 chart = new ChartPanel(model, "Plotting x^2", DefaultChart.LINEAR_X_LINEAR_Y);
66 chart.getCoordSystem().setPaintLabels(false);
67 chart.setLegend(null);
68 chart.addChartRenderer(new LineChartRenderer(chart.getCoordSystem(), model), 1);
69 this.getContentPane().add(chart, BorderLayout.CENTER);
70
71 this.getContentPane().add(status, BorderLayout.SOUTH);
72 }
73
74 public void actionPressed(ActionEvent evt) {
75 xmin.setForeground(Color.black);
76 xmax.setForeground(Color.black);
77 function.setForeground(Color.black);
78 status.setText(" ");
79
80 double x_min = 0.0;
81 double x_max = 1.0;
82 try {
83 x_min = Double.parseDouble(xmin.getText());
84 } catch(Exception e) {
85 xmin.setForeground(Color.red);
86 status.setText("The minimum x-value was no valid number.");
87 return;
88 }
89
90 try {
91 x_max = Double.parseDouble(xmax.getText());
92 } catch(Exception e) {
93 xmax.setForeground(Color.red);
94 status.setText("The maximum x-value was no valid number.");
95 return;
96 }
97
98 try {
99 model = FunctionPlotter.createChartDataModelInstance(x_min, x_max, 2000, function.getText());
100 } catch(Exception e) {
101 function.setForeground(Color.red);
102 status.setText("The function couldn't be parsed.");
103 return;
104 }
105
106 chart.setTitle(new Title("Plotting "+function.getText()));
107 chart.setLegend(null);
108 chart.setChartDataModel(model);
109 chart.setCoordSystem(new CoordSystem(model));
110 chart.getCoordSystem().setPaintLabels(false);
111 chart.addChartRenderer(new LineChartRenderer(chart.getCoordSystem(), model), 1);
112 chart.revalidate();
113 repaint();
114 }
115 }
116 |
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