Java tutorial
/******************************************************************************* * 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(); } }