use java2d to modify awt image displayed in swt gui

1 files changed, 198 insertions, 0 deletions

diff --git a/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet361.java b/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet361.java
new file mode 100644
index 0000000000..81ee2f06c3
--- /dev/null
+++ b/examples/org.eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet361.java
@@ -0,0 +1,198 @@
+/*******************************************************************************
+ * Copyright (c) 2012 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
+ *******************************************************************************/
+package org.eclipse.swt.snippets;
+
+/*
+ * example snippet: use Java2D to modify an image being displayed in an SWT GUI
+ *
+ * For a list of all SWT example snippets see
+ * http://www.eclipse.org/swt/snippets/
+ * 
+ * @since 3.8
+ */
+import java.awt.Frame;
+import java.awt.Canvas;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.Image;
+import java.awt.Toolkit;
+import java.awt.geom.AffineTransform;
+
+import org.eclipse.swt.*;
+import org.eclipse.swt.widgets.*;
+import org.eclipse.swt.layout.*;
+import org.eclipse.swt.events.*;
+import org.eclipse.swt.printing.*;
+import org.eclipse.swt.accessibility.*;
+import org.eclipse.swt.awt.SWT_AWT;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.ImageData;
+import org.eclipse.swt.graphics.Point;
+import org.eclipse.swt.graphics.Rectangle;
+
+public class Snippet361 {
+	static Composite composite; // SWT
+	static Canvas canvas; // AWT
+	static Image image = null; // AWT
+	static double translateX = 0, translateY = 0;
+	static double rotate = 0;
+	
+	public static void main(String[] args) {
+		final Display display = new Display();
+		final Shell shell = new Shell(display);
+		shell.setText("Translate and Rotate an AWT Image in an SWT GUI");
+		shell.setLayout(new GridLayout(8, false));
+		
+		Button fileButton = new Button(shell, SWT.PUSH);
+		fileButton.setText("&Open Image File");
+		fileButton.addSelectionListener(new SelectionAdapter() {
+			public void widgetSelected(SelectionEvent e) {
+				String filename = new FileDialog(shell).open();
+				if (filename != null) {
+					image = Toolkit.getDefaultToolkit().getImage(filename);
+					canvas.repaint();
+				}
+			}
+		});
+		
+		new Label(shell, SWT.NONE).setText("Translate &X by:");
+		final Combo translateXCombo = new Combo(shell, SWT.NONE);
+		translateXCombo.setItems(new String[] {"0", "image width", "image height", "100", "200"});
+		translateXCombo.select(0);
+		translateXCombo.addModifyListener(new ModifyListener() {
+			public void modifyText(ModifyEvent e) {
+				translateX = numericValue(translateXCombo);
+				canvas.repaint();
+			}
+		});
+		
+		new Label(shell, SWT.NONE).setText("Translate &Y by:");
+		final Combo translateYCombo = new Combo(shell, SWT.NONE);
+		translateYCombo.setItems(new String[] {"0", "image width", "image height", "100", "200"});
+		translateYCombo.select(0);
+		translateYCombo.addModifyListener(new ModifyListener() {
+			public void modifyText(ModifyEvent e) {
+				translateY = numericValue(translateYCombo);
+				canvas.repaint();
+			}
+		});
+		
+		new Label(shell, SWT.NONE).setText("&Rotate by:");
+		final Combo rotateCombo = new Combo(shell, SWT.NONE);
+		rotateCombo.setItems(new String[] {"0", "Pi", "Pi/2", "Pi/4", "Pi/8"});
+		rotateCombo.select(0);
+		rotateCombo.addModifyListener(new ModifyListener() {
+			public void modifyText(ModifyEvent e) {
+				rotate = numericValue(rotateCombo);
+				canvas.repaint();
+			}
+		});
+
+		Button printButton = new Button(shell, SWT.PUSH);
+		printButton.setText("&Print Image");
+		printButton.addSelectionListener(new SelectionAdapter() {
+			public void widgetSelected(SelectionEvent e) {
+				Rectangle r = composite.getBounds();
+				System.out.println(r);
+				Point p = shell.toDisplay(r.x, r.y);
+				System.out.println(p);
+				org.eclipse.swt.graphics.Image snapshotImage
+					= new org.eclipse.swt.graphics.Image(display, r.width-2, r.height-2);
+				GC snapshotGC = new GC(display);
+				snapshotGC.copyArea(snapshotImage, p.x+1, p.y+1);
+				PrintDialog dialog = new PrintDialog(shell, SWT.NONE);
+				PrinterData data = new PrinterData();
+				data.orientation = PrinterData.LANDSCAPE;
+				dialog.setPrinterData(data);
+				data = dialog.open();
+				if (data != null) {
+					Printer printer = new Printer(data);
+					Point screenDPI = display.getDPI();
+					Point printerDPI = printer.getDPI();
+					int scaleFactor = printerDPI.x / screenDPI.x;
+					Rectangle trim = printer.computeTrim(0, 0, 0, 0);
+					if (printer.startJob("Print Image")) {
+						ImageData imageData = snapshotImage.getImageData();
+						org.eclipse.swt.graphics.Image printerImage
+							= new org.eclipse.swt.graphics.Image(printer, imageData);
+						GC printerGC = new GC(printer);
+						if (printer.startPage()) {
+							printerGC.drawImage(
+								printerImage,
+								0,
+								0,
+								imageData.width,
+								imageData.height,
+								-trim.x,
+								-trim.y,
+								scaleFactor * imageData.width,
+								scaleFactor * imageData.height);
+							printer.endPage();
+						}
+						printerGC.dispose();
+						printer.endJob();
+					}
+					printer.dispose();
+				}
+				snapshotImage.dispose();
+				snapshotGC.dispose ();
+			}
+		});
+		
+		composite = new Composite(shell, SWT.EMBEDDED | SWT.BORDER);
+		composite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 8, 1));
+		Frame frame = SWT_AWT.new_Frame(composite);
+		canvas = new Canvas() {
+			public void paint (Graphics g) {
+				if (image != null) {
+					Graphics2D g2d = (Graphics2D) g;
+					AffineTransform t = new AffineTransform();
+					t.translate(translateX, translateY);
+					t.rotate(rotate);
+					g2d.setTransform(t);
+					g.drawImage(image, 0, 0, this);
+				}
+			}
+		};
+		frame.add(canvas);
+		composite.getAccessible().addAccessibleListener(new AccessibleAdapter() {
+			public void getName(AccessibleEvent e) {
+				e.result = "AWT Canvas showing Image";
+			}
+		});
+		
+		shell.open();
+		while(!shell.isDisposed()) {
+			if (!display.readAndDispatch()) display.sleep();
+		}
+		display.dispose();
+	}
+	
+	static double numericValue(Combo combo) {
+		String string = combo.getText();
+		if (string.equals("image width")) return image.getWidth(canvas);
+		if (string.equals("image height")) return image.getHeight(canvas);
+		if (string.equals("100")) return (double) 100;
+		if (string.equals("200")) return (double) 200;
+		if (string.equals("Pi")) return Math.PI;
+		if (string.equals("Pi/2")) return Math.PI / (double) 2;
+		if (string.equals("Pi/4")) return Math.PI / (double) 4;
+		if (string.equals("Pi/8")) return Math.PI / (double) 8;
+		/* Allow user-entered numbers. */
+		Double d = (double) 0;
+		try {
+			d = new Double(string);
+		} catch(NumberFormatException ex) {
+		};
+		return d;
+	}
+
+}