ImageCanvasSnipped.java example

Explorer
jo-widgets-master
/*
 * Copyright (c) 2015, grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
package org.jowidgets.examples.common.snipped;

import org.jowidgets.api.color.Colors;
import org.jowidgets.api.controller.IPaintEvent;
import org.jowidgets.api.graphics.IGraphicContext;
import org.jowidgets.api.graphics.IPaintListener;
import org.jowidgets.api.image.IImage;
import org.jowidgets.api.image.ImageFactory;
import org.jowidgets.api.layout.FillLayout;
import org.jowidgets.api.toolkit.Toolkit;
import org.jowidgets.api.widgets.ICanvas;
import org.jowidgets.api.widgets.IFrame;
import org.jowidgets.api.widgets.IScrollComposite;
import org.jowidgets.common.application.IApplication;
import org.jowidgets.common.application.IApplicationLifecycle;
import org.jowidgets.common.graphics.Point;
import org.jowidgets.tools.widgets.blueprint.BPF;
import org.jowidgets.util.url.UrlFactory;

public final class ImageCanvasSnipped implements IApplication {

    @Override
    public void start(final IApplicationLifecycle lifecycle) {

        //create the root frame
        final IFrame frame = Toolkit.createRootFrame(BPF.frame("Image Canvas Snipped"), lifecycle);
        frame.setLayout(FillLayout.get());

        //create a scroll composite
        final IScrollComposite container = frame.add(BPF.scrollComposite());
        container.setLayout(FillLayout.get());

        //create a image from url
        final String url = "http://www.jowidgets.org/docu/images/widgets_hierarchy_1.gif";
        final IImage image = ImageFactory.createImage(UrlFactory.create(url));

        //use a canvas to display the image
        final ICanvas canvas = container.add(BPF.canvas());

        //set the preferred size of the canvas to the image size
        canvas.setPreferredSize(image.getSize());

        //add a paint listener to draw the image and an arrow
        canvas.addPaintListener(new IPaintListener() {
            @Override
            public void paint(final IPaintEvent event) {
                final IGraphicContext gc = event.getGraphicContext();

                //draw the image
                gc.drawImage(image);

                //draw with green color
                gc.setForegroundColor(Colors.GREEN);

                //define a polygon that shapes an arrow
                final Point p1 = new Point(438, 205);
                final Point p2 = new Point(464, 205);
                final Point p3 = new Point(464, 199);
                final Point p4 = new Point(486, 211);
                final Point p5 = new Point(464, 223);
                final Point p6 = new Point(464, 217);
                final Point p7 = new Point(438, 217);
                final Point[] polygon = new Point[] {p1, p2, p3, p4, p5, p6, p7, p1};

                //fill the polygon 
                gc.fillPolygon(polygon);
            }
        });

        //set the root frame visible
        frame.setVisible(true);
    }
}