import edu.uci.ics.jung.visualization.renderers.Checkmark; //导入依赖的package包/类
/**
 * Draws a checkmark on the component and stores the original visual representation to be restored by {@link #undoCheckMark() }.
 * The parameters indicate the position relative to the center of the component.
 * @param dxFromMid
 * @param dyFromMid
 */
protected void drawCheckMark(int dxFromMid, int dyFromMid) {
    original = BufferedImageUtil.deepCopy(visualRepresentation);
    Checkmark checkmark = new Checkmark(Color.green);
    Dimension id = new Dimension(visualRepresentation.getWidth(), visualRepresentation.getHeight());
    int dx = (id.width - checkmark.getIconWidth()) / 2 + dxFromMid;
    int dy = (id.height - checkmark.getIconHeight()) / 2 + dyFromMid;
    Graphics g = visualRepresentation.getGraphics();
    checkmark.paintIcon(null, g, 0 + dx, 0 + dy);
}
 

import edu.uci.ics.jung.visualization.renderers.Checkmark; //导入依赖的package包/类
public PickWithIconListener(DefaultVertexIconTransformer<Number> imager) {
    this.imager = imager;
    checked = new Checkmark(Color.red);
}
 

import edu.uci.ics.jung.visualization.renderers.Checkmark; //导入依赖的package包/类
public PickWithIconListener(DefaultVertexIconTransformer<V> imager) {
    this.imager = imager;
    checked = new Checkmark();
}