org.eclipse.swt.examples.graphics.AdvancedGraphics.java Source code

Introduction

Here is the source code for org.eclipse.swt.examples.graphics.AdvancedGraphics.java

Source

/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.examples.graphics;

/*
 * Drawing with transformations, paths and alpha blending
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import java.io.IOException;
import java.io.InputStream;
import java.util.ResourceBundle;

import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Path;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.Transform;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.MessageBox;
import org.eclipse.swt.widgets.Shell;

public class AdvancedGraphics {

    private static final ResourceBundle RESOURCE_BUNDLE = ResourceBundle.getBundle("examples_graphics");

    static Image loadImage(Device device, Class<AdvancedGraphics> clazz, String string) {
        InputStream stream = clazz.getResourceAsStream(string);
        if (stream == null)
            return null;
        Image image = null;
        try {
            image = new Image(device, stream);
        } catch (SWTException ex) {
        } finally {
            try {
                stream.close();
            } catch (IOException ex) {
            }
        }
        return image;
    }

    public Shell open(final Display display) {
        final Shell shell = new Shell(display);
        shell.setText(RESOURCE_BUNDLE.getString("AdvancedGraphics")); //$NON-NLS-1$
        try {
            Path path = new Path(display);
            path.dispose();
        } catch (SWTException e) {
            MessageBox dialog = new MessageBox(shell, SWT.ICON_WARNING | SWT.OK);
            dialog.setText(RESOURCE_BUNDLE.getString("Warning")); //$NON-NLS-1$
            dialog.setMessage(RESOURCE_BUNDLE.getString("LibNotFound")); //$NON-NLS-1$
            dialog.open();
            shell.dispose();
            return null;
        }
        FontData fd = shell.getFont().getFontData()[0];
        final Font font = new Font(display, fd.getName(), 96, SWT.BOLD | SWT.ITALIC);
        final Image image = loadImage(display, AdvancedGraphics.class, "irmaos.jpg");
        final Rectangle rect = image.getBounds();
        shell.addListener(SWT.Paint, event -> {
            GC gc = event.gc;
            Transform tr = new Transform(display);
            tr.translate(rect.width / 4, rect.height / 2);
            tr.rotate(-30);
            if (image != null) {
                gc.drawImage(image, 0, 0, rect.width, rect.height, 0, 0, rect.width, rect.height);
            }
            gc.setAlpha(100);
            gc.setTransform(tr);
            Path path = new Path(display);
            path.addString("SWT", 0, 0, font);
            gc.setBackground(display.getSystemColor(SWT.COLOR_GREEN));
            gc.setForeground(display.getSystemColor(SWT.COLOR_BLUE));
            gc.fillPath(path);
            gc.drawPath(path);
            tr.dispose();
            path.dispose();
        });
        shell.setSize(shell.computeSize(rect.width, rect.height));
        shell.open();
        shell.addListener(SWT.Dispose, event -> {
            if (image != null)
                image.dispose();
            font.dispose();
        });
        return shell;
    }

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new AdvancedGraphics().open(display);
        while (shell != null && !shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}