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2010-06-01T05:57:55Z

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в 18:01, 31 мая 2010

2010-05-31T18:01:43Z

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== 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>



== Canvas example snippet: implement tab traversal ==



<source lang="java">

/******************************************************************************
* Copyright (c) 1998, 2004 Jackwind Li Guojie
* All right reserved.
*
* Created on Jan 24, 2004 3:03:14 PM by JACK
* $Id$
*
* visit: http://www.asprise.ru/swt
*****************************************************************************/
/*
* Canvas example snippet: implement tab traversal (behave like a tab group)
*
* For a list of all SWT example snippets see
* http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class CanvasExample {
public static void main(String[] args) {
Display display = new Display();

Image small = new Image(display, 16, 16);
GC gc = new GC(small);
gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
gc.fillArc(0, 0, 16, 16, 45, 270);
gc.dispose();

Image large = new Image(display, 32, 32);
gc = new GC(large);
gc.setBackground(display.getSystemColor(SWT.COLOR_BLUE));
gc.fillArc(0, 0, 32, 32, 45, 270);
gc.dispose();

/* Provide different resolutions for icons to get
* high quality rendering wherever the OS needs
* large icons. For example, the ALT+TAB window
* on certain systems uses a larger icon.
*/
Shell shell = new Shell(display);
shell.setText("Small and Large icons");
shell.setImages(new Image[] {small, large});
/* No large icon: the OS will scale up the
* small icon when it needs a large one.
*/
Shell shell2 = new Shell(display);
shell2.setText("Small icon");
shell2.setImage(small);

shell.open();
shell2.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}

</source>



== Demonstrates a Canvas ==



<source lang="java">

//Send questions, comments, bug reports, etc. to the authors:
//Rob Warner (rwarner@interspatial.ru)
//Robert Harris (rbrt_harris@yahoo.ru)
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
/**
* This class demonstrates a Canvas
*/
public class SimpleCanvas {
/**
* Runs the application
*/
public void run() {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Canvas Example");
createContents(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
/**
* Creates the main window"s contents
*
* @param shell the main window
*/
private void createContents(Shell shell) {
shell.setLayout(new FillLayout());
// Create a canvas
Canvas canvas = new Canvas(shell, SWT.NONE);
// Create a button on the canvas
Button button = new Button(canvas, SWT.PUSH);
button.setBounds(10, 10, 300, 40);
button.setText("You can place widgets on a canvas");
// Create a paint handler for the canvas
canvas.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
// Do some drawing
Rectangle rect = ((Canvas) e.widget).getBounds();
e.gc.setForeground(e.display.getSystemColor(SWT.COLOR_RED));
e.gc.drawFocus(5, 5, rect.width - 10, rect.height - 10);
e.gc.drawText("You can draw text directly on a canvas", 60, 60);
}
});
}
/**
* The application entry point
*
* @param args the command line arguments
*/
public static void main(String[] args) {
new SimpleCanvas().run();
}
}

</source>

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Admin: 1 версия

в 18:01, 31 мая 2010