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== 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>

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в 17:44, 31 мая 2010

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