Java2dHelper.java

/*
Copyright 2008-2010 Gephi
Authors : Mathieu Bastian <mathieu.bastian@gephi.org>
Website : http://www.gephi.org

This file is part of Gephi.

Gephi is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

Gephi is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with Gephi.  If not, see <http://www.gnu.org/licenses/>.
*/
package org.gephi.ui.components.SplineEditor;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;

import javax.imageio.ImageIO;

public class Java2dHelper {

    public static BufferedImage createCompatibleImage(int width, int height) {
        GraphicsEnvironment environment = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice screenDevice = environment.getDefaultScreenDevice();
        GraphicsConfiguration configuration = screenDevice.getDefaultConfiguration();
        return configuration.createCompatibleImage(width, height);
    }

    public static BufferedImage loadCompatibleImage(URL resource) throws IOException {
        BufferedImage image = ImageIO.read(resource);
        BufferedImage compatibleImage = createCompatibleImage(image.getWidth(), image.getHeight());
        Graphics g = compatibleImage.getGraphics();
        g.drawImage(image, 0, 0, null);
        g.dispose();
        image = null;
        return compatibleImage;
    }

    public static BufferedImage createThumbnail(BufferedImage image, int requestedThumbSize) {
        float ratio = (float) image.getWidth() / (float) image.getHeight();
        int width = image.getWidth();
        BufferedImage thumb = image;

        do {
            width /= 2;
            if (width < requestedThumbSize) {
                width = requestedThumbSize;
            }

            BufferedImage temp = new BufferedImage(width, (int) (width / ratio), BufferedImage.TYPE_INT_ARGB);
            Graphics2D g2 = temp.createGraphics();
            g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                    RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g2.drawImage(thumb, 0, 0, temp.getWidth(), temp.getHeight(), null);
            g2.dispose();

            thumb = temp;
        } while (width != requestedThumbSize);

        return thumb;
    }
}