How to use

XYLineAndShapeRenderer$State

in

org.jfree.chart.renderer.xy

@Override
protected void drawPrimaryLineAsPath(XYItemRendererState state,
    Graphics2D g2, XYPlot plot, XYDataset dataset, int pass,
    int series, int item, ValueAxis domainAxis, ValueAxis rangeAxis,
    Rectangle2D dataArea) {
  RectangleEdge xAxisLocation = plot.getDomainAxisEdge();
  RectangleEdge yAxisLocation = plot.getRangeAxisEdge();
  // get the data point...
  double x1 = dataset.getXValue(series, item);
  double y1 = dataset.getYValue(series, item);
  double transX1 = domainAxis.valueToJava2D(x1, dataArea, xAxisLocation);
  double transY1 = rangeAxis.valueToJava2D(y1, dataArea, yAxisLocation);
  State s = (State) state;
  // update path to reflect latest point
  if (!Double.isNaN(transX1) && !Double.isNaN(transY1)) {
    this.points.add(new Point2D.Double(transX1, transY1));
  }
  // if this is the last item, draw the path ...
  if (item == s.getLastItemIndex()) {
    List<Point2D> pts = this.getCurvePoints();
    s.seriesPath.moveTo(pts.get(0).getX(), pts.get(0).getY());
    for (int i = 1; i < pts.size(); i++) {
      final Point2D p = pts.get(i);
      s.seriesPath.lineTo(p.getX(), p.getY());
    }
    // draw path
    drawFirstPassShape(g2, pass, series, item, s.seriesPath);
    this.points.clear();
  }
}

/**
 * Initialises the renderer.
 * <P>
 * This method will be called before the first item is rendered, giving the
 * renderer an opportunity to initialise any state information it wants to
 * maintain.  The renderer can do nothing if it chooses.
 *
 * @param g2  the graphics device.
 * @param dataArea  the area inside the axes.
 * @param plot  the plot.
 * @param data  the data.
 * @param info  an optional info collection object to return data back to
 *              the caller.
 *
 * @return The renderer state.
 */
public XYItemRendererState initialise(Graphics2D g2,
                   Rectangle2D dataArea,
                   XYPlot plot,
                   XYDataset data,
                   PlotRenderingInfo info) {
  State state = new State(info);
  state.seriesPath = new GeneralPath();
  return state;
}

@Override
public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea,
    XYPlot plot, XYDataset data, PlotRenderingInfo info) {
  State state = (State) super.initialise(g2, dataArea, plot, data, info);
  state.setProcessVisibleItemsOnly(false);
  this.points.clear();
  setDrawSeriesLineAsPath(true);
  return state;
}

    y = (float) transX1;
  if (s.isLastPointGood()) {
    s.seriesPath.lineTo(x, y);
    s.seriesPath.moveTo(x, y);
  s.setLastPointGood(true);
  s.setLastPointGood(false);
if (item == s.getLastItemIndex()) {

    y = (float) transX1;
  if (s.isLastPointGood()) {
    s.seriesPath.lineTo(x, y);
    s.seriesPath.moveTo(x, y);
  s.setLastPointGood(true);
} else {
  s.setLastPointGood(false);
if (item == s.getLastItemIndex()) {

/**
 * Initialises the renderer.
 * <P>
 * This method will be called before the first item is rendered, giving the
 * renderer an opportunity to initialise any state information it wants to
 * maintain.  The renderer can do nothing if it chooses.
 *
 * @param g2  the graphics device.
 * @param dataArea  the area inside the axes.
 * @param plot  the plot.
 * @param data  the data.
 * @param info  an optional info collection object to return data back to
 *              the caller.
 *
 * @return The renderer state.
 */
public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea,
    XYPlot plot, XYDataset data, PlotRenderingInfo info) {
  State state = (State) super.initialise(g2, dataArea, plot, data, info);
  state.setProcessVisibleItemsOnly(false);
  this.points = new Vector();
  setDrawSeriesLineAsPath(true);
  return state;
}

/**
 * Initialises the renderer.
 * <P>
 * This method will be called before the first item is rendered, giving the
 * renderer an opportunity to initialise any state information it wants to
 * maintain.  The renderer can do nothing if it chooses.
 *
 * @param g2  the graphics device.
 * @param dataArea  the area inside the axes.
 * @param plot  the plot.
 * @param data  the data.
 * @param info  an optional info collection object to return data back to
 *              the caller.
 *
 * @return The renderer state.
 */
@Override
public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea,
    XYPlot plot, XYDataset data, PlotRenderingInfo info) {
  return new State(info);
}