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/*******************************************************************************
* 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.
* Take a screen snapshot to print the image to a printer.
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.8
*/
import java.awt.Color;
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();
Point p = shell.toDisplay(r.x, r.y);
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);
GridData data = new GridData(SWT.FILL, SWT.FILL, true, true, 8, 1);
data.widthHint = 640;
data.heightHint = 480;
composite.setLayoutData(data);
Frame frame = SWT_AWT.new_Frame(composite);
canvas = new Canvas() {
public void paint (Graphics g) {
if (image != null) {
g.setColor(Color.WHITE);
g.fillRect(0, 0, canvas.getWidth(), canvas.getHeight());
/* Use Java2D here to modify the image as desired. */
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 = "Image drawn in AWT Canvas";
}
});
shell.pack();
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;
}
}
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