001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.plugins.streetside.utils;
003
004import java.awt.Image;
005
006import javax.swing.ImageIcon;
007
008import org.openstreetmap.josm.tools.Logging;
009
010public final class ImageUtil {
011  private ImageUtil() {
012    // Private constructor to avoid instantiation
013  }
014
015  /**
016   * Scales an {@link ImageIcon} to the desired size
017   * @param icon the icon, which should be resized
018   * @param size the desired length of the longest edge of the icon
019   * @return the resized {@link ImageIcon}. It is the same object that you put in,
020   *         only the contained {@link Image} is exchanged.
021   */
022  public static ImageIcon scaleImageIcon(final ImageIcon icon, int size) {
023    Logging.debug("Scale icon {0} → {1}", icon.getIconWidth(), size);
024    return new ImageIcon(icon.getImage().getScaledInstance(
025      icon.getIconWidth() >= icon.getIconHeight() ? size : Math.max(1, Math.round(icon.getIconWidth() / (float) icon.getIconHeight() * size)),
026      icon.getIconHeight() >= icon.getIconWidth() ? size : Math.max(1, Math.round(icon.getIconHeight() / (float) icon.getIconWidth() * size)),
027      Image.SCALE_SMOOTH
028    ));
029  }
030}