Java Tutorial/SWT 2D Graphics/SWT Paint — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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Текущая версия на 18:18, 31 мая 2010
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>