/*****************************************************************************
* *
* This file is part of the BeanShell Java Scripting distribution. *
* Documentation and updates may be found at http://www.beanshell.org/ *
* *
* Sun Public License Notice: *
* *
* The contents of this file are subject to the Sun Public License Version *
* 1.0 (the "License"); you may not use this file except in compliance with *
* the License. A copy of the License is available at http://www.sun.com *
* *
* The Original Code is BeanShell. The Initial Developer of the Original *
* Code is Pat Niemeyer. Portions created by Pat Niemeyer are Copyright *
* (C) 2000. All Rights Reserved. *
* *
* GNU Public License Notice: *
* *
* Alternatively, the contents of this file may be used under the terms of *
* the GNU Lesser General Public License (the "LGPL"), in which case the *
* provisions of LGPL are applicable instead of those above. If you wish to *
* allow use of your version of this file only under the terms of the LGPL *
* and not to allow others to use your version of this file under the SPL, *
* indicate your decision by deleting the provisions above and replace *
* them with the notice and other provisions required by the LGPL. If you *
* do not delete the provisions above, a recipient may use your version of *
* this file under either the SPL or the LGPL. *
* *
* Patrick Niemeyer (pat@pat.net) *
* Author of Learning Java, O'Reilly & Associates *
* http://www.pat.net/~pat/ *
* *
*****************************************************************************/
package bsh.util;
import java.awt.*;
import javax.swing.*;
import bsh.*;
/**
Scriptable Canvas with buffered graphics.
Provides a Component that:
1) delegates calls to paint() to a bsh method called paint()
in a specific NameSpace.
2) provides a simple buffered image maintained by built in paint() that
is useful for simple immediate procedural rendering from scripts...
*/
public class BshCanvas extends JComponent {
This ths;
Image imageBuffer;
public BshCanvas () { }
public BshCanvas ( This ths ) {
this.ths = ths;
}
public void paintComponent( Graphics g ) {
// copy buffered image
if ( imageBuffer != null )
g.drawImage(imageBuffer, 0,0, this);
// Delegate call to scripted paint() method
if ( ths != null ) {
try {
ths.invokeMethod( "paint", new Object[] { g } );
} catch(EvalError e) {
if ( Interpreter.DEBUG ) Interpreter.debug(
"BshCanvas: method invocation error:" + e);
}
}
}
/**
Get a buffered (persistent) image for drawing on this component
*/
public Graphics getBufferedGraphics() {
Dimension dim = getSize();
imageBuffer = createImage( dim.width, dim.height );
return imageBuffer.getGraphics();
}
public void setBounds( int x, int y, int width, int height ) {
setPreferredSize( new Dimension(width, height) );
setMinimumSize( new Dimension(width, height) );
super.setBounds( x, y, width, height );
}
}