javax.swing.ImageIcon#getImageObserver ( )源码实例Demo

/**
 * @param navigationManager  manager for these point markers
 * @param name the name for this point marker
 * @param desc the description associated with this point marker
 * @param priority to sort out what displays on top, higher is more likely to be on top
 * @param showMarkers true indicates to show area markers (on the left side of the browser.)
 * @param showNavigation true indicates to show area navigation markers (on the right side of the browser.)
 * @param colorBackground colorBackground the color of marked areas in navigation bar
 *              If color is null, no results are displayed in the associated marker bar.
 * @param markerColor the color of the marker
 * @param icon the icon used to represent the cursor in the marker margin
 * @param isPreferred true indicates higher priority than all non-preferred MarkerSets
 */
PointMarkerSet(MarkerManager navigationManager, String name, String desc, int priority,
		boolean showMarkers, boolean showNavigation, boolean colorBackground, Color markerColor,
		ImageIcon icon, boolean isPreferred) {
	super(navigationManager, name, desc, priority, showMarkers, showNavigation, colorBackground,
		markerColor, isPreferred);
	if (icon == null) {
		icon = ResourceManager.loadImage("images/warning.png");
	}
	icon = ResourceManager.getScaledIcon(icon, 16, 16, Image.SCALE_SMOOTH);
	image = icon.getImage();
	imageObserver = icon.getImageObserver();
	if (markerColor != null) {
		fillColor = getFillColor(markerColor);
	}
}
 

public static BufferedImage getBufferedImage(ImageIcon icon) {
    int width = 320;//icon.getIconWidth();
    int height = 480;//icon.getIconHeight();
    ImageObserver observer = icon.getImageObserver();
    BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    Graphics gc = bufferedImage.createGraphics();
    gc.drawImage(icon.getImage(), 0, 0, observer);

    return bufferedImage;
}