Java Tutorial/SWT 2D Graphics/SWT Paint
Содержание
A dynamic gradient
<source lang="java">
/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are 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: * IBM Corporation - initial API and implementation *******************************************************************************/
/*
* Control example snippet: a dynamic gradient * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ * * @since 3.2 */
import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; public class GradientDynamic {
static Image oldImage;
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setBackgroundMode(SWT.INHERIT_DEFAULT);
shell.addListener(SWT.Resize, new Listener() {
public void handleEvent(Event event) {
Rectangle rect = shell.getClientArea();
Image newImage = new Image(display, Math.max(1, rect.width), 1);
GC gc = new GC(newImage);
gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
gc.fillGradientRectangle(rect.x, rect.y, rect.width, 1, false);
gc.dispose();
shell.setBackgroundImage(newImage);
if (oldImage != null){
oldImage.dispose();
}
oldImage = newImage;
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
if (oldImage != null)
oldImage.dispose();
display.dispose();
}
}</source>
Alpha blending
<source lang="java">
/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are 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: * IBM Corporation - initial API and implementation *******************************************************************************/
/*
* Drawing with transformations, paths and alpha blending * * For a list of all SWT example snippets see * http://www.eclipse.org/swt/snippets/ * * @since 3.1 */
import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Font; import org.eclipse.swt.graphics.FontData; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Path; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; public class FillDrawPath {
public static void main(String[] args) {
final Display display = new Display();
final Shell shell = new Shell(display);
FontData fd = shell.getFont().getFontData()[0];
final Font font = new Font(display, fd.getName(), 60, SWT.BOLD | SWT.ITALIC);
final Image image = new Image(display, 640, 480);
final Rectangle rect = image.getBounds();
GC gc = new GC(image);
gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
gc.fillOval(rect.x, rect.y, rect.width, rect.height);
gc.dispose();
shell.addListener(SWT.Paint, new Listener() {
public void handleEvent(Event event) {
GC gc = event.gc;
gc.drawImage(image, 0, 0, rect.width, rect.height, 0, 0, rect.width / 2, rect.height / 2);
gc.setAlpha(100);
Path path = new Path(display);
path.addString("SWT", 0, 0, font);
gc.setBackground(display.getSystemColor(SWT.COLOR_GREEN));
gc.setForeground(display.getSystemColor(SWT.COLOR_BLUE));
gc.fillPath(path);
gc.drawPath(path);
path.dispose();
}
});
shell.setSize(shell.ruputeSize(rect.width / 2, rect.height / 2));
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
image.dispose();
font.dispose();
display.dispose();
}
}</source>
A paint canvas.
<source lang="java">
/*
* 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.ruposite; /**
* 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();
}
}</source>
Implement a simple scribble program
<source lang="java">
/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are 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: * IBM Corporation - initial API and implementation *******************************************************************************/
import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.GC; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; public class ScribbleProgram {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
Listener listener = new Listener() {
int lastX = 0, lastY = 0;
public void handleEvent(Event event) {
switch (event.type) {
case SWT.MouseMove:
if ((event.stateMask & SWT.BUTTON1) == 0)
break;
GC gc = new GC(shell);
gc.drawLine(lastX, lastY, event.x, event.y);
gc.dispose();
case SWT.MouseDown:
lastX = event.x;
lastY = event.y;
break;
}
}
};
shell.addListener(SWT.MouseDown, listener);
shell.addListener(SWT.MouseMove, listener);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}</source>
