Java Plot.addChangeListener方法代码示例

import org.jfree.chart.plot.Plot; //导入方法依赖的package包/类
/**
 * Constructs a chart.
 * <P>
 * Note that the ChartFactory class contains static methods that will
 * return a ready-made chart.
 *
 * @param title  the chart title (<code>null</code> permitted).
 * @param titleFont  the font for displaying the chart title (<code>null</code> permitted).
 * @param plot  controller of the visual representation of the data (<code>null</code> not
 *              permitted).
 * @param createLegend  a flag indicating whether or not a legend should
 *                      be created for the chart.
 */
public JFreeChart(String title, Font titleFont, Plot plot, boolean createLegend) {

    if (plot == null) {
        throw new NullPointerException("JFreeChart(..): Plot is null");
    }

    // create storage for listeners...
    this.progressListeners = new EventListenerList();
    this.changeListeners = new EventListenerList();
    this.notify = true;  // default is to notify listeners when the chart changes

    this.renderingHints = new RenderingHints(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);

    this.borderVisible = false;
    this.borderStroke = new BasicStroke(1.0f);
    this.borderPaint = Color.black;

    this.plot = plot;
    plot.addChangeListener(this);

    this.subtitles = new ArrayList();

    // create a legend, if requested...
    if (createLegend) {
        setLegend(Legend.createInstance(this));
    }

    // add the chart title, if one has been specified...
    if (title != null) {
        if (titleFont == null) {
            titleFont = DEFAULT_TITLE_FONT;
        }
        this.title = new TextTitle(title, titleFont);
        this.title.addChangeListener(this);
    }

    this.backgroundPaint = DEFAULT_BACKGROUND_PAINT;

    this.backgroundImage = DEFAULT_BACKGROUND_IMAGE;
    this.backgroundImageAlignment = DEFAULT_BACKGROUND_IMAGE_ALIGNMENT;
    this.backgroundImageAlpha = DEFAULT_BACKGROUND_IMAGE_ALPHA;

}
 

import org.jfree.chart.plot.Plot; //导入方法依赖的package包/类
/**
 * Creates a new chart with the given title and plot.  The 
 * <code>createLegend</code> argument specifies whether or not a legend
 * should be added to the chart.  
 * <br><br>
 * Note that the  {@link ChartFactory} class contains a range 
 * of static methods that will return ready-made charts, and often this
 * is a more convenient way to create charts than using this constructor.
 *
 * @param title  the chart title (<code>null</code> permitted).
 * @param titleFont  the font for displaying the chart title 
 *                   (<code>null</code> permitted).
 * @param plot  controller of the visual representation of the data 
 *              (<code>null</code> not permitted).
 * @param createLegend  a flag indicating whether or not a legend should   
 *                      be created for the chart.
 */
public JFreeChart(String title, Font titleFont, Plot plot, 
                  boolean createLegend) {

    if (plot == null) {
        throw new NullPointerException("Null 'plot' argument.");
    }

    // create storage for listeners...
    this.progressListeners = new EventListenerList();
    this.changeListeners = new EventListenerList();
    this.notify = true;  // default is to notify listeners when the 
                         // chart changes

    this.renderingHints = new RenderingHints(
            RenderingHints.KEY_ANTIALIASING, 
            RenderingHints.VALUE_ANTIALIAS_ON);

    this.borderVisible = false;
    this.borderStroke = new BasicStroke(1.0f);
    this.borderPaint = Color.black;

    this.padding = RectangleInsets.ZERO_INSETS;
    
    this.plot = plot;
    plot.addChangeListener(this);

    this.subtitles = new ArrayList();

    // create a legend, if requested...
    if (createLegend) {
        LegendTitle legend = new LegendTitle(this.plot);
        legend.setMargin(new RectangleInsets(1.0, 1.0, 1.0, 1.0));
        legend.setFrame(new LineBorder());
        legend.setBackgroundPaint(Color.white);
        legend.setPosition(RectangleEdge.BOTTOM);
        this.subtitles.add(legend);
    }

    // add the chart title, if one has been specified...
    if (title != null) {
        if (titleFont == null) {
            titleFont = DEFAULT_TITLE_FONT;
        }
        this.title = new TextTitle(title, titleFont);
        this.title.addChangeListener(this);
    }

    this.backgroundPaint = DEFAULT_BACKGROUND_PAINT;

    this.backgroundImage = DEFAULT_BACKGROUND_IMAGE;
    this.backgroundImageAlignment = DEFAULT_BACKGROUND_IMAGE_ALIGNMENT;
    this.backgroundImageAlpha = DEFAULT_BACKGROUND_IMAGE_ALPHA;

}