01: /*****************************************************************************
02: * *
03: * This file is part of the BeanShell Java Scripting distribution. *
04: * Documentation and updates may be found at http://www.beanshell.org/ *
05: * *
06: * Sun Public License Notice: *
07: * *
08: * The contents of this file are subject to the Sun Public License Version *
09: * 1.0 (the "License"); you may not use this file except in compliance with *
10: * the License. A copy of the License is available at http://www.sun.com *
11: * *
12: * The Original Code is BeanShell. The Initial Developer of the Original *
13: * Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright *
14: * (C) 2000. All Rights Reserved. *
15: * *
16: * GNU Public License Notice: *
17: * *
18: * Alternatively, the contents of this file may be used under the terms of *
19: * the GNU Lesser General Public License (the "LGPL"), in which case the *
20: * provisions of LGPL are applicable instead of those above. If you wish to *
21: * allow use of your version of this file only under the terms of the LGPL *
22: * and not to allow others to use your version of this file under the SPL, *
23: * indicate your decision by deleting the provisions above and replace *
24: * them with the notice and other provisions required by the LGPL. If you *
25: * do not delete the provisions above, a recipient may use your version of *
26: * this file under either the SPL or the LGPL. *
27: * *
28: * Patrick Niemeyer (pat@pat.net) *
29: * Author of Learning Java, O'Reilly & Associates *
30: * http://www.pat.net/~pat/ *
31: * *
32: *****************************************************************************/package bsh.util;
33:
34: import java.awt.*;
35: import javax.swing.*;
36: import bsh.*;
37:
38: /**
39: Scriptable Canvas with buffered graphics.
40:
41: Provides a Component that:
42: 1) delegates calls to paint() to a bsh method called paint()
43: in a specific NameSpace.
44: 2) provides a simple buffered image maintained by built in paint() that
45: is useful for simple immediate procedural rendering from scripts...
46:
47: */
48: public class BshCanvas extends JComponent {
49: This ths;
50: Image imageBuffer;
51:
52: public BshCanvas() {
53: }
54:
55: public BshCanvas(This ths) {
56: this .ths = ths;
57: }
58:
59: public void paintComponent(Graphics g) {
60: // copy buffered image
61: if (imageBuffer != null)
62: g.drawImage(imageBuffer, 0, 0, this );
63:
64: // Delegate call to scripted paint() method
65: if (ths != null) {
66: try {
67: ths.invokeMethod("paint", new Object[] { g });
68: } catch (EvalError e) {
69: if (Interpreter.DEBUG)
70: Interpreter
71: .debug("BshCanvas: method invocation error:"
72: + e);
73: }
74: }
75: }
76:
77: /**
78: Get a buffered (persistent) image for drawing on this component
79: */
80: public Graphics getBufferedGraphics() {
81: Dimension dim = getSize();
82: imageBuffer = createImage(dim.width, dim.height);
83: return imageBuffer.getGraphics();
84: }
85:
86: public void setBounds(int x, int y, int width, int height) {
87: setPreferredSize(new Dimension(width, height));
88: setMinimumSize(new Dimension(width, height));
89: super.setBounds(x, y, width, height);
90: }
91:
92: }
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