SWT 2D Simple Demo
/*******************************************************************************
* Copyright (c) 2004 Berthold Daum. All rights reserved. This program and the
* accompanying materials are made available under the terms of the Common
* Public License v1.0 which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors: Berthold Daum
******************************************************************************/
import java.awt.RenderingHints;
import java.util.ArrayList;
import java.util.Iterator;
import org.eclipse.swt.SWT;
import org.eclipse.swt.awt.SWT_AWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class SWT2D {
// Shell fur Popup-Editor
Shell eShell = null;
// Text-Widget fur Editor
Text eText = null;
// Liste eingegebener Zeichenketten
ArrayList wordList = new ArrayList(12);
public static void main(String[] args) {
SWT2D swtawt = new SWT2D();
swtawt.run();
}
private void run() {
// Create top level shell
final Display display = new Display();
final Shell shell = new Shell(display);
shell.setText("Java 2D Example");
// GridLayout for canvas and button
shell.setLayout(new GridLayout());
// Create container for AWT canvas
final Composite canvasComp = new Composite(shell, SWT.EMBEDDED);
// Set preferred size
GridData data = new GridData();
data.widthHint = 600;
data.heightHint = 500;
canvasComp.setLayoutData(data);
// Create AWT Frame for Canvas
java.awt.Frame canvasFrame = SWT_AWT.new_Frame(canvasComp);
// Create Canvas and add it to the Frame
final java.awt.Canvas canvas = new java.awt.Canvas();
canvasFrame.add(canvas);
// Get graphical context and cast to Java2D
final java.awt.Graphics2D g2d = (java.awt.Graphics2D) canvas
.getGraphics();
// Enable antialiasing
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
// Remember initial transform
final java.awt.geom.AffineTransform origTransform = g2d.getTransform();
// Create Clear button and position it
Button clearButton = new Button(shell, SWT.PUSH);
clearButton.setText("Clear");
data = new GridData();
data.horizontalAlignment = GridData.CENTER;
clearButton.setLayoutData(data);
// Event processing for Clear button
clearButton.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
// Delete word list and redraw canvas
wordList.clear();
canvasComp.redraw();
}
});
// Process canvas mouse clicks
canvas.addMouseListener(new java.awt.event.MouseListener() {
public void mouseClicked(java.awt.event.MouseEvent e) {
}
public void mouseEntered(java.awt.event.MouseEvent e) {
}
public void mouseExited(java.awt.event.MouseEvent e) {
}
public void mousePressed(java.awt.event.MouseEvent e) {
// Manage pop-up editor
display.syncExec(new Runnable() {
public void run() {
if (eShell == null) {
// Create new Shell: non-modal!
eShell = new Shell(shell, SWT.NO_TRIM
| SWT.MODELESS);
eShell.setLayout(new FillLayout());
// Text input field
eText = new Text(eShell, SWT.BORDER);
eText.setText("Text rotation in the SWT?");
eShell.pack();
// Set position (Display coordinates)
java.awt.Rectangle bounds = canvas.getBounds();
org.eclipse.swt.graphics.Point pos = canvasComp
.toDisplay(bounds.width / 2,
bounds.height / 2);
Point size = eShell.getSize();
eShell.setBounds(pos.x, pos.y, size.x, size.y);
// Open Shell
eShell.open();
} else if (!eShell.isVisible()) {
// Editor versteckt, sichtbar machen
eShell.setVisible(true);
} else {
// Editor is visible - get text
String t = eText.getText();
// set editor invisible
eShell.setVisible(false);
// Add text to list and redraw canvas
wordList.add(t);
canvasComp.redraw();
}
}
});
}
public void mouseReleased(java.awt.event.MouseEvent e) {
}
});
// Redraw the canvas
canvasComp.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
// Pass the redraw task to AWT event queue
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
// Compute canvas center
java.awt.Rectangle bounds = canvas.getBounds();
int originX = bounds.width / 2;
int originY = bounds.height / 2;
// Reset canvas
g2d.setTransform(origTransform);
g2d.setColor(java.awt.Color.WHITE);
g2d.fillRect(0, 0, bounds.width, bounds.height);
// Set font
g2d.setFont(new java.awt.Font("Myriad",
java.awt.Font.PLAIN, 32));
double angle = 0d;
// Prepare star shape
double increment = Math.toRadians(30);
Iterator iter = wordList.iterator();
while (iter.hasNext()) {
// Determine text colors in RGB color cycle
float red = (float) (0.5 + 0.5 * Math.sin(angle));
float green = (float) (0.5 + 0.5 * Math.sin(angle
+ Math.toRadians(120)));
float blue = (float) (0.5 + 0.5 * Math.sin(angle
+ Math.toRadians(240)));
g2d.setColor(new java.awt.Color(red, green, blue));
// Redraw text
String text = (String) iter.next();
g2d.drawString(text, originX + 50, originY);
// Rotate for next text output
g2d.rotate(increment, originX, originY);
angle += increment;
}
}
});
}
});
// Finish shell and open it
shell.pack();
shell.open();
// SWT event processing
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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