ColorBufferBrowser.java

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/*
 * Copyright (c) 2008, AIST, the University of Tokyo and General Robotix Inc.
 * All rights reserved. This program is made available under the terms of the
 * Eclipse Public License v1.0 which accompanies this distribution, and is
 * available at http://www.eclipse.org/legal/epl-v10.html
 * Contributors:
 * General Robotix Inc.
 * National Institute of Advanced Industrial Science and Technology (AIST) 
 */
package com.generalrobotix.ui.view.vsensor;

// Java2 SDK
import java.awt.Canvas;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.ColorModel;
import java.awt.image.MemoryImageSource;

// Swing
import javax.swing.JFrame;

// Sun
import com.generalrobotix.ui.view.Grx3DView;

@SuppressWarnings("serial")
public final class ColorBufferBrowser extends JFrame {
        // canvas for drawing image
        private CanvasDraw canvas_;

        // working space
        private boolean updated_ = false;

        public ColorBufferBrowser( int width, int height, String title ) {
                super(title);

                canvas_ = new CanvasDraw (
                        Grx3DView.graphicsConfiguration,
                        width, height
                );
                canvas_.setSize(width, height);
                canvas_.setBackground(java.awt.Color.white);

                getContentPane().setLayout(new FlowLayout());
                getContentPane().add(canvas_);
                pack();
                setResizable(false);
        }

        public void setColorBuffer(int[] colorBuffer) {
                canvas_.setColorBuffer(colorBuffer);
                updated_ = true;
                canvas_.repaint();
        }

        @SuppressWarnings("serial")
        final class CanvasDraw extends Canvas {
                // raster size
                private int width_;

                // image source
                private MemoryImageSource       mis_;

                // color model
                private ColorModel cm_ = ColorModel.getRGBdefault();

                // color buffer
                private int[]   colorBuffer_;

                // image
                private Image img_;

                public CanvasDraw(java.awt.GraphicsConfiguration gconfig, int width, int height) {
                        super(gconfig);

                        // raster size
                        width_ = width;

                        // create image source
                        mis_ = new MemoryImageSource (
                                width,
                                height,
                                null,   // color buffer
                                0,
                                width
                        );
                }

                public void setColorBuffer(int[] colorBuffer) {
                        colorBuffer_ = colorBuffer;
                        mis_.newPixels(colorBuffer, cm_, 0, width_);
                }

                public void update(Graphics g) {
                        if (updated_)
                                paint(g);
                        else
                                return;
                }

                public void paint(Graphics g) {
                        if (!updated_)
                                return;
                        updated_ = false;

                        if (colorBuffer_ == null)
                                return;

                        // image
                        img_ = createImage(mis_);
                        g.drawImage(img_, 0, 0, this);
                }
        }
}