Mega Code Archive
A paint canvas
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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.]
*
* -------------------
* SwtPaintCanvas.java
* -------------------
* (C) Copyright 2000-2007, by Object Refinery Limited.
*
* Original Author: Henry Proudhon (henry.proudhon AT ensmp.fr);
* Contributor(s): David Gilbert (for Object Refinery Limited);
*
* Changes
* -------
* 04-Aug-2006 : New class (HP);
* 25-Oct-2007 : Fixed Eclipse warnings (DG);
*
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
/**
* A paint canvas.
*/
public class SWTPaintCanvas extends Canvas {
private Color myColor;
/**
* Creates a new instance.
*
* @param parent the parent.
* @param style the style.
* @param color the color.
*/
public SWTPaintCanvas(Composite parent, int style, Color color) {
this(parent, style);
setColor(color);
}
/**
* Creates a new instance.
*
* @param parent the parent.
* @param style the style.
*/
public SWTPaintCanvas(Composite parent, int style) {
super(parent, style);
addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
e.gc.setForeground(e.gc.getDevice().getSystemColor(
SWT.COLOR_BLACK));
e.gc.setBackground(SWTPaintCanvas.this.myColor);
e.gc.fillRectangle(getClientArea());
e.gc.drawRectangle(getClientArea().x, getClientArea().y,
getClientArea().width - 1, getClientArea().height - 1);
}
});
}
/**
* Sets the color.
*
* @param color the color.
*/
public void setColor(Color color) {
if (this.myColor != null) {
this.myColor.dispose();
}
//this.myColor = new Color(getDisplay(), color.getRGB());
this.myColor = color;
}
/**
* Returns the color.
*
* @return The color.
*/
public Color getColor() {
return this.myColor;
}
/**
* Overridden to do nothing.
*
* @param c the color.
*/
public void setBackground(Color c) {
return;
}
/**
* Overridden to do nothing.
*
* @param c the color.
*/
public void setForeground(Color c) {
return;
}
/**
* Frees resources.
*/
public void dispose() {
this.myColor.dispose();
}
}
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