org.eclipse.swt.snippets.Snippet285.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet285.java

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/*******************************************************************************
 * Copyright (c) 2007, 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;

/*
 * create a circular shell from a path.
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class Snippet285 {
    static void loadPath(Region region, float[] points, byte[] types) {
        int start = 0, end = 0;
        for (int i = 0; i < types.length; i++) {
            switch (types[i]) {
            case SWT.PATH_MOVE_TO: {
                if (start != end) {
                    int n = 0;
                    int[] temp = new int[end - start];
                    for (int k = start; k < end; k++) {
                        temp[n++] = Math.round(points[k]);
                    }
                    region.add(temp);
                }
                start = end;
                end += 2;
                break;
            }
            case SWT.PATH_LINE_TO: {
                end += 2;
                break;
            }
            case SWT.PATH_CLOSE: {
                if (start != end) {
                    int n = 0;
                    int[] temp = new int[end - start];
                    for (int k = start; k < end; k++) {
                        temp[n++] = Math.round(points[k]);
                    }
                    region.add(temp);
                }
                start = end;
                break;
            }
            }
        }
    }

    public static void main(String[] args) {
        int width = 250, height = 250;
        final Display display = new Display();
        final Shell shell = new Shell(display, SWT.NO_TRIM);
        shell.setText("Snippet 285");
        final Path path = new Path(display);
        path.addArc(0, 0, width, height, 0, 360);
        Path path2 = new Path(display, path, 0.1f);
        path.dispose();
        PathData data = path2.getPathData();
        path2.dispose();
        Region region = new Region(display);
        loadPath(region, data.points, data.types);
        shell.setRegion(region);
        Listener listener = event -> {
            switch (event.type) {
            case SWT.MouseDown: {
                shell.dispose();
                break;
            }
            case SWT.Paint: {
                GC gc = event.gc;
                Rectangle rect = shell.getClientArea();
                Pattern pattern = new Pattern(display, rect.x, rect.y + rect.height, rect.x + rect.width, rect.y,
                        display.getSystemColor(SWT.COLOR_BLUE), display.getSystemColor(SWT.COLOR_WHITE));
                gc.setBackgroundPattern(pattern);
                gc.fillRectangle(rect);
                pattern.dispose();
                break;
            }
            }
        };
        shell.addListener(SWT.MouseDown, listener);
        shell.addListener(SWT.Paint, listener);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        region.dispose();
        display.dispose();
    }

}