org.eclipse.swt.snippets.Snippet200.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet200.java

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/*******************************************************************************
 * 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.snippets;

/*
 * Fill a shape with a predefined pattern
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.1
 */
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet200 {
    public static void main(String[] args) {
        Display display = new Display();
        //define a pattern on an image
        final Image image = new Image(display, 1000, 1000);
        Color blue = display.getSystemColor(SWT.COLOR_BLUE);
        Color yellow = display.getSystemColor(SWT.COLOR_YELLOW);
        Color white = display.getSystemColor(SWT.COLOR_WHITE);
        GC gc = new GC(image);
        gc.setBackground(white);
        gc.setForeground(yellow);
        gc.fillGradientRectangle(0, 0, 1000, 1000, true);
        for (int i = -500; i < 1000; i += 10) {
            gc.setForeground(blue);
            gc.drawLine(i, 0, 500 + i, 1000);
            gc.drawLine(500 + i, 0, i, 1000);
        }
        gc.dispose();
        final Pattern pattern;
        try {
            pattern = new Pattern(display, image);
        } catch (SWTException e) {
            //Advanced Graphics not supported.
            //This new API requires the Cairo Vector engine on GTK and GDI+ on Windows.
            System.out.println(e.getMessage());
            display.dispose();
            return;
        }

        Shell shell = new Shell(display);
        shell.setText("Snippet 200");
        shell.setLayout(new FillLayout());
        Composite c = new Composite(shell, SWT.DOUBLE_BUFFERED);
        c.addListener(SWT.Paint, event -> {
            Rectangle r = ((Composite) event.widget).getClientArea();
            GC gc1 = event.gc;
            gc1.setBackgroundPattern(pattern);
            gc1.fillOval(5, 5, r.width - 10, r.height - 10);
        });
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        image.dispose();
        pattern.dispose();
        display.dispose();
    }
}