Fractal


1   /*****************************************************************************
2   
3   JEP - Java Math Expression Parser 2.3.0
4         October 3 2004
5         (c) Copyright 2004, Nathan Funk and Richard Morris
6         See LICENSE.txt for license information.
7   
8   *****************************************************************************/
9   
10  /*
11  <applet code="org.nfunk.jepexamples.Fractal" width=300 height=320>
12  <param name=initialExpression value="z*z+c">
13  </applet>
14  */
15  package org.nfunk.jepexamples;
16  
17  import java.applet.*;
18  import java.awt.*;
19  import java.awt.event.*;
20  
21  public class Fractal extends Applet implements ActionListener {
22  
23      private TextField exprField, itField;
24      private Button button, button2;
25      private FractalCanvas complexCanvas;
26  
27  
28      /** Initializes the applet Fractal */
29      public void init () {
30          initComponents();
31      }
32  
33  
34      private void initComponents () {
35          GridBagLayout gridbag = new GridBagLayout();
36          GridBagConstraints c = new GridBagConstraints();
37  
38          setLayout(gridbag);
39          c.fill = GridBagConstraints.BOTH;
40          
41          // Expression field
42          String   expr = getParameter("initialExpression");
43          if (expr!=null)
44              exprField = new TextField(expr);
45          else
46              exprField = new TextField("");
47  
48  
49          exprField.setBackground (java.awt.Color.white);
50          exprField.setName ("exprField");
51          exprField.setFont (new Font ("Dialog", 0, 11));
52          exprField.setForeground (Color.black);
53          exprField.addTextListener (new java.awt.event.TextListener   () {
54              public void textValueChanged (java.awt.event.TextEvent   evt) {
55                  exprFieldTextValueChanged (evt);
56              }
57          }
58          );
59  
60          c.gridx = 0;
61          c.gridy = 0;
62          c.weightx = 1;
63          gridbag.setConstraints(exprField, c);
64          add(exprField);
65  
66          // RENDER BUTTON
67          c.gridx = 1;
68          c.gridy = 0;
69          c.weightx = 0.2;
70          button = new Button("Render");
71          gridbag.setConstraints(button, c);
72          add(button);
73          button.addActionListener(this);
74  
75          // Iterations field
76          itField = new TextField("20");
77          itField.addTextListener (new java.awt.event.TextListener   () {
78              public void textValueChanged (java.awt.event.TextEvent   evt) {
79                  itFieldTextValueChanged(evt);
80              }
81          }
82          );
83  
84          c.gridx = 0;
85          c.gridy = 1;
86          c.weightx = 1;
87          gridbag.setConstraints(itField, c);
88          add(itField);
89  
90  
91          // CANVAS
92          c.gridx = 0;
93          c.gridy = 2;
94          c.gridwidth = 2;
95          c.weighty = 1;
96  //      button2 = new Button("test");
97          
98          complexCanvas = new FractalCanvas(expr, exprField);
99          gridbag.setConstraints(complexCanvas, c);
100         add(complexCanvas);
101     }
102 
103 
104 
105     private void exprFieldTextValueChanged (java.awt.event.TextEvent   evt) {
106         String   newExpressionString = exprField.getText();
107         complexCanvas.setExpressionString(newExpressionString);
108         //complexCanvas.repaint();
109     }
110 
111     private void itFieldTextValueChanged (java.awt.event.TextEvent   evt) {
112         Integer   newIterationsValue = new Integer  (itField.getText());
113         complexCanvas.setIterations(newIterationsValue.intValue());
114         //complexCanvas.repaint();
115     }
116 
117     public void actionPerformed(ActionEvent ae) {
118         String   str = ae.getActionCommand();
119         if (str.equals("Render")) {
120             String   newExpressionString = exprField.getText();
121             complexCanvas.setExpressionString(newExpressionString);
122             complexCanvas.repaint();
123         }
124     }
125 }
126
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