Mega Code Archive
Create an awt font by converting as much information as possible from the provided swt FontData
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/*
* 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);
*
*/
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</code> 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</code> 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</code>.
* <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);
}
}
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