bsh.util.BshCanvas Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of aibench-shell Show documentation
The newest version!
/*
 * #%L
 * The AIBench Shell Plugin
 * %%
 * Copyright (C) 2006 - 2017 Daniel Glez-Peña and Florentino Fdez-Riverola
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */
/*****************************************************************************
 *                                                                           *
 *  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 ([email protected])                                           *
 *  Author of Learning Java, O'Reilly & Associates                           *
 *  http://www.pat.net/~pat/                                                 *
 *                                                                           *
 *****************************************************************************/

package bsh.util;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;

import javax.swing.JComponent;

import bsh.EvalError;
import bsh.Interpreter;
import bsh.This;

/**
 * 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 {
	private static final long serialVersionUID = 1L;

	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);
			}
		}
	}

	/**
	 * Returns a buffered (persistent) image for drawing on this component.
	 * 
	 * @return 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);
	}

}