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jfreechart example source code file (SWTUtils.java)

This example jfreechart source code file (SWTUtils.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

awt, directcolormodel, event, font, font, fontdata, fontdata, gc, gc, geometry, gui, image, imagedata, imagedata, indexcolormodel, jpanel, mouseevent, point, rgb, swing

The jfreechart SWTUtils.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 *
 * This library 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 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * -------------
 * SWTUtils.java
 * -------------
 * (C) Copyright 2006, 2007, by Henry Proudhon and Contributors.
 *
 * Original Author:  Henry Proudhon (henry.proudhon AT ensmp.fr);
 * Contributor(s):   Rainer Blessing;
 *                   David Gilbert (david.gilbert@object-refinery.com);
 *                   Christoph Beck.
 *
 * Changes
 * -------
 * 01-Aug-2006 : New class (HP);
 * 16-Jan-2007 : Use FontData.getHeight() instead of direct field access (RB);
 * 31-Jan-2007 : Moved the dummy JPanel from SWTGraphics2D.java,
 *               added a new convert method for mouse events (HP);
 * 12-Jul-2007 : Improved the mouse event conversion with buttons
 *               and modifiers handling, patch sent by Christoph Beck (HP);
 * 27-Aug-2007 : Modified toAwtMouseEvent signature (HP);
 * 27-Nov-2007 : Moved convertToSWT() method from SWTGraphics2D and added
 *               convertAWTImageToSWT() (DG);
 * 01-Jul-2008 : Simplify AWT/SWT font style conversions (HP);
 *
 */

package org.jfree.experimental.swt;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.DirectColorModel;
import java.awt.image.IndexColorModel;
import java.awt.image.WritableRaster;

import javax.swing.JPanel;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.Rectangle;

/**
 * Utility class gathering some useful and general method.
 * Mainly convert forth and back graphical stuff between
 * awt and swt.
 */
public class SWTUtils {

    private final static String Az = "ABCpqr";

    /** A dummy JPanel used to provide font metrics. */
    protected static final JPanel DUMMY_PANEL = new JPanel();

    /**
     * Create a <code>FontData object which encapsulate
     * the essential data to create a swt font. The data is taken
     * from the provided awt Font.
     * <p>Generally speaking, given a font size, the returned swt font
     * will display differently on the screen than the awt one.
     * Because the SWT toolkit use native graphical resources whenever
     * it is possible, this fact is platform dependent. To address
     * this issue, it is possible to enforce the method to return
     * a font with the same size (or at least as close as possible)
     * as the awt one.
     * <p>When the object is no more used, the user must explicitly
     * call the dispose method on the returned font to free the
     * operating system resources (the garbage collector won't do it).
     *
     * @param device The swt device to draw on (display or gc device).
     * @param font The awt font from which to get the data.
     * @param ensureSameSize A boolean used to enforce the same size
     * (in pixels) between the awt font and the newly created swt font.
     * @return a <code>FontData object.
     */
    public static FontData toSwtFontData(Device device, java.awt.Font font,
            boolean ensureSameSize) {
        FontData fontData = new FontData();
        fontData.setName(font.getFamily());
        // SWT and AWT share the same style constants.
        fontData.setStyle(font.getStyle());
        // convert the font size (in pt for awt) to height in pixels for swt
        int height = (int) Math.round(font.getSize() * 72.0
                / device.getDPI().y);
        fontData.setHeight(height);
        // hack to ensure the newly created swt fonts will be rendered with the
        // same height as the awt one
        if (ensureSameSize) {
            GC tmpGC = new GC(device);
            Font tmpFont = new Font(device, fontData);
            tmpGC.setFont(tmpFont);
            if (tmpGC.textExtent(Az).x
                    > DUMMY_PANEL.getFontMetrics(font).stringWidth(Az)) {
                while (tmpGC.textExtent(Az).x
                        > DUMMY_PANEL.getFontMetrics(font).stringWidth(Az)) {
                    tmpFont.dispose();
                    height--;
                    fontData.setHeight(height);
                    tmpFont = new Font(device, fontData);
                    tmpGC.setFont(tmpFont);
                }
            }
            else if (tmpGC.textExtent(Az).x
                    < DUMMY_PANEL.getFontMetrics(font).stringWidth(Az)) {
                while (tmpGC.textExtent(Az).x
                        < DUMMY_PANEL.getFontMetrics(font).stringWidth(Az)) {
                    tmpFont.dispose();
                    height++;
                    fontData.setHeight(height);
                    tmpFont = new Font(device, fontData);
                    tmpGC.setFont(tmpFont);
                }
            }
            tmpFont.dispose();
            tmpGC.dispose();
        }
        return fontData;
    }

    /**
     * Create an awt font by converting as much information
     * as possible from the provided swt <code>FontData.
     * <p>Generally speaking, given a font size, an swt font will
     * display differently on the screen than the corresponding awt
     * one. Because the SWT toolkit use native graphical ressources whenever
     * it is possible, this fact is platform dependent. To address
     * this issue, it is possible to enforce the method to return
     * an awt font with the same height as the swt one.
     *
     * @param device The swt device being drawn on (display or gc device).
     * @param fontData The swt font to convert.
     * @param ensureSameSize A boolean used to enforce the same size
     * (in pixels) between the swt font and the newly created awt font.
     * @return An awt font converted from the provided swt font.
     */
    public static java.awt.Font toAwtFont(Device device, FontData fontData,
            boolean ensureSameSize) {
        int height = (int) Math.round(fontData.getHeight() * device.getDPI().y
                / 72.0);
        // hack to ensure the newly created awt fonts will be rendered with the
        // same height as the swt one
        if (ensureSameSize) {
            GC tmpGC = new GC(device);
            Font tmpFont = new Font(device, fontData);
            tmpGC.setFont(tmpFont);
            JPanel DUMMY_PANEL = new JPanel();
            java.awt.Font tmpAwtFont = new java.awt.Font(fontData.getName(),
                    fontData.getStyle(), height);
            if (DUMMY_PANEL.getFontMetrics(tmpAwtFont).stringWidth(Az)
                    > tmpGC.textExtent(Az).x) {
                while (DUMMY_PANEL.getFontMetrics(tmpAwtFont).stringWidth(Az)
                        > tmpGC.textExtent(Az).x) {
                    height--;
                    tmpAwtFont = new java.awt.Font(fontData.getName(),
                            fontData.getStyle(), height);
                }
            }
            else if (DUMMY_PANEL.getFontMetrics(tmpAwtFont).stringWidth(Az)
                    < tmpGC.textExtent(Az).x) {
                while (DUMMY_PANEL.getFontMetrics(tmpAwtFont).stringWidth(Az)
                        < tmpGC.textExtent(Az).x) {
                    height++;
                    tmpAwtFont = new java.awt.Font(fontData.getName(),
                            fontData.getStyle(), height);
                }
            }
            tmpFont.dispose();
            tmpGC.dispose();
        }
        return new java.awt.Font(fontData.getName(), fontData.getStyle(),
                height);
    }

    /**
     * Create an awt font by converting as much information
     * as possible from the provided swt <code>Font.
     *
     * @param device The swt device to draw on (display or gc device).
     * @param font The swt font to convert.
     * @return An awt font converted from the provided swt font.
     */
    public static java.awt.Font toAwtFont(Device device, Font font) {
        FontData fontData = font.getFontData()[0];
        return toAwtFont(device, fontData, true);
    }

    /**
     * Creates an awt color instance to match the rgb values
     * of the specified swt color.
     *
     * @param color The swt color to match.
     * @return an awt color abject.
     */
    public static java.awt.Color toAwtColor(Color color) {
        return new java.awt.Color(color.getRed(), color.getGreen(),
                color.getBlue());
    }

    /**
     * Creates a swt color instance to match the rgb values
     * of the specified awt paint. For now, this method test
     * if the paint is a color and then return the adequate
     * swt color. Otherwise plain black is assumed.
     *
     * @param device The swt device to draw on (display or gc device).
     * @param paint The awt color to match.
     * @return a swt color object.
     */
    public static Color toSwtColor(Device device, java.awt.Paint paint) {
        java.awt.Color color;
        if (paint instanceof java.awt.Color) {
            color = (java.awt.Color) paint;
        }
        else {
            try {
                throw new Exception("only color is supported at present... "
                        + "setting paint to uniform black color");
            }
            catch (Exception e) {
                e.printStackTrace();
                color = new java.awt.Color(0, 0, 0);
            }
        }
        return new org.eclipse.swt.graphics.Color(device,
                color.getRed(), color.getGreen(), color.getBlue());
    }

    /**
     * Creates a swt color instance to match the rgb values
     * of the specified awt color. alpha channel is not supported.
     * Note that the dispose method will need to be called on the
     * returned object.
     *
     * @param device The swt device to draw on (display or gc device).
     * @param color The awt color to match.
     * @return a swt color object.
     */
    public static Color toSwtColor(Device device, java.awt.Color color) {
        return new org.eclipse.swt.graphics.Color(device,
                color.getRed(), color.getGreen(), color.getBlue());
    }

    /**
     * Transform an awt Rectangle2d instance into a swt one.
     * The coordinates are rounded to integer for the swt object.
     * @param rect2d The awt rectangle to map.
     * @return an swt <code>Rectangle object.
     */
    public static Rectangle toSwtRectangle(Rectangle2D rect2d) {
        return new Rectangle(
                (int) Math.round(rect2d.getMinX()),
                (int) Math.round(rect2d.getMinY()),
                (int) Math.round(rect2d.getWidth()),
                (int) Math.round(rect2d.getHeight()));
    }

    /**
     * Transform a swt Rectangle instance into an awt one.
     * @param rect the swt <code>Rectangle
     * @return a Rectangle2D.Double instance with
     * the eappropriate location and size.
     */
    public static Rectangle2D toAwtRectangle(Rectangle rect) {
        Rectangle2D rect2d = new Rectangle2D.Double();
        rect2d.setRect(rect.x, rect.y, rect.width, rect.height);
        return rect2d;
    }

    /**
     * Returns an AWT point with the same coordinates as the specified
     * SWT point.
     *
     * @param p  the SWT point (<code>null not permitted).
     *
     * @return An AWT point with the same coordinates as <code>p.
     *
     * @see #toSwtPoint(java.awt.Point)
     */
    public static Point2D toAwtPoint(Point p) {
        return new java.awt.Point(p.x, p.y);
    }

    /**
     * Returns an SWT point with the same coordinates as the specified
     * AWT point.
     *
     * @param p  the AWT point (<code>null not permitted).
     *
     * @return An SWT point with the same coordinates as <code>p.
     *
     * @see #toAwtPoint(Point)
     */
    public static Point toSwtPoint(java.awt.Point p) {
        return new Point(p.x, p.y);
    }

    /**
     * Returns an SWT point with the same coordinates as the specified AWT
     * point (rounded to integer values).
     *
     * @param p  the AWT point (<code>null not permitted).
     *
     * @return An SWT point with the same coordinates as <code>p.
     *
     * @see #toAwtPoint(Point)
     */
    public static Point toSwtPoint(java.awt.geom.Point2D p) {
        return new Point((int) Math.round(p.getX()),
                (int) Math.round(p.getY()));
    }

    /**
     * Creates an AWT <code>MouseEvent from a swt event.
     * This method helps passing SWT mouse event to awt components.
     * @param event The swt event.
     * @return A AWT mouse event based on the given SWT event.
     */
    public static MouseEvent toAwtMouseEvent(org.eclipse.swt.events.MouseEvent event) {
        int button = MouseEvent.NOBUTTON;
        switch (event.button) {
        case 1: button = MouseEvent.BUTTON1; break;
        case 2: button = MouseEvent.BUTTON2; break;
        case 3: button = MouseEvent.BUTTON3; break;
        }
        int modifiers = 0;
        if ((event.stateMask & SWT.CTRL) != 0) {
            modifiers |= InputEvent.CTRL_DOWN_MASK;
        }
        if ((event.stateMask & SWT.SHIFT) != 0) {
            modifiers |= InputEvent.SHIFT_DOWN_MASK;
        }
        if ((event.stateMask & SWT.ALT) != 0) {
            modifiers |= InputEvent.ALT_DOWN_MASK;
        }
        MouseEvent awtMouseEvent = new MouseEvent(DUMMY_PANEL, event.hashCode(),
                event.time, modifiers, event.x, event.y, 1, false, button);
        return awtMouseEvent;
    }

    /**
     * Converts an AWT image to SWT.
     *
     * @param image  the image (<code>null not permitted).
     *
     * @return Image data.
     */
    public static ImageData convertAWTImageToSWT(Image image) {
        if (image == null) {
            throw new IllegalArgumentException("Null 'image' argument.");
        }
        int w = image.getWidth(null);
        int h = image.getHeight(null);
        if (w == -1 || h == -1) {
            return null;
        }
        BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics g = bi.getGraphics();
        g.drawImage(image, 0, 0, null);
        g.dispose();
        return convertToSWT(bi);
    }

    /**
     * Converts a buffered image to SWT <code>ImageData.
     *
     * @param bufferedImage  the buffered image (<code>null not
     *         permitted).
     *
     * @return The image data.
     */
    public static ImageData convertToSWT(BufferedImage bufferedImage) {
        if (bufferedImage.getColorModel() instanceof DirectColorModel) {
            DirectColorModel colorModel
                    = (DirectColorModel) bufferedImage.getColorModel();
            PaletteData palette = new PaletteData(colorModel.getRedMask(),
                    colorModel.getGreenMask(), colorModel.getBlueMask());
            ImageData data = new ImageData(bufferedImage.getWidth(),
                    bufferedImage.getHeight(), colorModel.getPixelSize(),
                    palette);
            WritableRaster raster = bufferedImage.getRaster();
            int[] pixelArray = new int[3];
            for (int y = 0; y < data.height; y++) {
                for (int x = 0; x < data.width; x++) {
                    raster.getPixel(x, y, pixelArray);
                    int pixel = palette.getPixel(new RGB(pixelArray[0],
                            pixelArray[1], pixelArray[2]));
                    data.setPixel(x, y, pixel);
                }
            }
            return data;
        }
        else if (bufferedImage.getColorModel() instanceof IndexColorModel) {
            IndexColorModel colorModel = (IndexColorModel)
                    bufferedImage.getColorModel();
            int size = colorModel.getMapSize();
            byte[] reds = new byte[size];
            byte[] greens = new byte[size];
            byte[] blues = new byte[size];
            colorModel.getReds(reds);
            colorModel.getGreens(greens);
            colorModel.getBlues(blues);
            RGB[] rgbs = new RGB[size];
            for (int i = 0; i < rgbs.length; i++) {
                rgbs[i] = new RGB(reds[i] & 0xFF, greens[i] & 0xFF,
                        blues[i] & 0xFF);
            }
            PaletteData palette = new PaletteData(rgbs);
            ImageData data = new ImageData(bufferedImage.getWidth(),
                    bufferedImage.getHeight(), colorModel.getPixelSize(),
                    palette);
            data.transparentPixel = colorModel.getTransparentPixel();
            WritableRaster raster = bufferedImage.getRaster();
            int[] pixelArray = new int[1];
            for (int y = 0; y < data.height; y++) {
                for (int x = 0; x < data.width; x++) {
                    raster.getPixel(x, y, pixelArray);
                    data.setPixel(x, y, pixelArray[0]);
                }
            }
            return data;
        }
        return null;
    }

}

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