xydifferencerenderer.java

提供JFreechart图表功能, 提供JFreechart图表功能,提供JFreechart图表功能

        // draw the item label if there is one...
        if (isItemLabelVisible(x_series, x_item)) {
            drawItemLabel(x_graphics, l_orientation, x_dataset, x_series,
                          x_item, l_x1, l_y1, (l_y1 < 0.0));
        }

        int l_domainAxisIndex = x_plot.getDomainAxisIndex(x_domainAxis);
        int l_rangeAxisIndex  = x_plot.getRangeAxisIndex(x_rangeAxis);
        updateCrosshairValues(x_crosshairState, l_x0, l_y0, l_domainAxisIndex,
                              l_rangeAxisIndex, l_x1, l_y1, l_orientation);

        if (0 == x_item) {
            return;
        }

        double l_x2 = x_domainAxis.valueToJava2D(x_dataset.getXValue(x_series, 
                (x_item - 1)), x_dataArea, l_domainAxisLocation);
        double l_y2 = x_rangeAxis.valueToJava2D(x_dataset.getYValue(x_series, 
                (x_item - 1)), x_dataArea, l_rangeAxisLocation);

        Line2D l_line = null;
        if (PlotOrientation.HORIZONTAL == l_orientation) {
            l_line = new Line2D.Double(l_y1, l_x1, l_y2, l_x2);
        }
        else if (PlotOrientation.VERTICAL == l_orientation) {
            l_line = new Line2D.Double(l_x1, l_y1, l_x2, l_y2);
        }
 
        if ((null != l_line) && l_line.intersects(x_dataArea)) {
            x_graphics.setPaint(getItemPaint(x_series, x_item));
            x_graphics.setStroke(getItemStroke(x_series, x_item));
            x_graphics.draw(l_line);
        }
    }

    /**
     * Determines if a dataset is degenerate.  A degenerate dataset is a 
     * dataset where either series has less than two (2) points.
     *
     * @param x_dataset  the dataset.
     * @param x_impliedZeroSubtrahend  if false, do not check the subtrahend
     *
     * @return true if the dataset is degenerate.
     */
    private boolean isEitherSeriesDegenerate(XYDataset x_dataset, 
            boolean x_impliedZeroSubtrahend) {

        if (x_impliedZeroSubtrahend) {
            return (x_dataset.getItemCount(0) < 2);
        }

        return ((x_dataset.getItemCount(0) < 2) 
                || (x_dataset.getItemCount(1) < 2));
    }

    /**
     * Determines if the two (2) series are disjoint.
     * Disjoint series do not overlap in the domain space.
     *
     * @param x_dataset  the dataset.
     *
     * @return true if the dataset is degenerate.
     */
    private boolean areSeriesDisjoint(XYDataset x_dataset) {

        int l_minuendItemCount = x_dataset.getItemCount(0);
        double l_minuendFirst  = x_dataset.getXValue(0, 0);
        double l_minuendLast   = x_dataset.getXValue(0, l_minuendItemCount - 1);

        int l_subtrahendItemCount = x_dataset.getItemCount(1);
        double l_subtrahendFirst  = x_dataset.getXValue(1, 0);
        double l_subtrahendLast   = x_dataset.getXValue(1, 
                l_subtrahendItemCount - 1);

        return ((l_minuendLast < l_subtrahendFirst) 
                || (l_subtrahendLast < l_minuendFirst));
    }

    /**
     * Draws the visual representation of a polygon
     *
     * @param x_graphics  the graphics device.
     * @param x_dataArea  the area within which the data is being drawn.
     * @param x_plot  the plot (can be used to obtain standard color
     *                information etc).
     * @param x_domainAxis  the domain (horizontal) axis.
     * @param x_rangeAxis  the range (vertical) axis.
     * @param x_positive  indicates if the polygon is positive (true) or 
     *                    negative (false).
     * @param x_xValues  a linked list of the x values (expects values to be 
     *                   of type Double).
     * @param x_yValues  a linked list of the y values (expects values to be 
     *                   of type Double).
     */
    private void createPolygon (Graphics2D x_graphics,
                                Rectangle2D x_dataArea,
                                XYPlot x_plot,
                                ValueAxis x_domainAxis,
                                ValueAxis x_rangeAxis,
                                boolean x_positive,
                                LinkedList x_xValues,
                                LinkedList x_yValues) {

        PlotOrientation l_orientation      = x_plot.getOrientation();
        RectangleEdge l_domainAxisLocation = x_plot.getDomainAxisEdge();
        RectangleEdge l_rangeAxisLocation  = x_plot.getRangeAxisEdge();

        Object[] l_xValues = x_xValues.toArray();
        Object[] l_yValues = x_yValues.toArray();

        GeneralPath l_path = new GeneralPath();

        if (PlotOrientation.VERTICAL == l_orientation) {
            double l_x = x_domainAxis.valueToJava2D((
                    (Double) l_xValues[0]).doubleValue(), x_dataArea, 
                    l_domainAxisLocation);
            if (this.roundXCoordinates) {
                l_x = Math.rint(l_x);
            }

            double l_y = x_rangeAxis.valueToJava2D((
                    (Double) l_yValues[0]).doubleValue(), x_dataArea, 
                    l_rangeAxisLocation);

            l_path.moveTo((float) l_x, (float) l_y);
            for (int i = 1; i < l_xValues.length; i++) {
                l_x = x_domainAxis.valueToJava2D((
                        (Double) l_xValues[i]).doubleValue(), x_dataArea, 
                        l_domainAxisLocation);
                if (this.roundXCoordinates) {
                    l_x = Math.rint(l_x);
                }

                l_y = x_rangeAxis.valueToJava2D((
                        (Double) l_yValues[i]).doubleValue(), x_dataArea, 
                        l_rangeAxisLocation);
                l_path.lineTo((float) l_x, (float) l_y);
            }
            l_path.closePath();
        }
        else {
            double l_x = x_domainAxis.valueToJava2D((
                    (Double) l_xValues[0]).doubleValue(), x_dataArea, 
                    l_domainAxisLocation);
            if (this.roundXCoordinates) {
                l_x = Math.rint(l_x);
            }

            double l_y = x_rangeAxis.valueToJava2D((
                    (Double) l_yValues[0]).doubleValue(), x_dataArea, 
                    l_rangeAxisLocation);

            l_path.moveTo((float) l_y, (float) l_x);
            for (int i = 1; i < l_xValues.length; i++) {
                l_x = x_domainAxis.valueToJava2D((
                        (Double) l_xValues[i]).doubleValue(), x_dataArea, 
                        l_domainAxisLocation);
                if (this.roundXCoordinates) {
                    l_x = Math.rint(l_x);
                }

                l_y = x_rangeAxis.valueToJava2D((
                        (Double) l_yValues[i]).doubleValue(), x_dataArea, 
                        l_rangeAxisLocation);
                l_path.lineTo((float) l_y, (float) l_x);
            }
            l_path.closePath();
        }

        if (l_path.intersects(x_dataArea)) {
            x_graphics.setPaint(x_positive ? getPositivePaint() 
                    : getNegativePaint());
            x_graphics.fill(l_path);
        }
    }

    /**
     * Returns a default legend item for the specified series.  Subclasses 
     * should override this method to generate customised items.
     *
     * @param datasetIndex  the dataset index (zero-based).
     * @param series  the series index (zero-based).
     *
     * @return A legend item for the series.
     */
    public LegendItem getLegendItem(int datasetIndex, int series) {
        LegendItem result = null;
        XYPlot p = getPlot();
        if (p != null) {
            XYDataset dataset = p.getDataset(datasetIndex);
            if (dataset != null) {
                if (getItemVisible(series, 0)) {
                    String label = getLegendItemLabelGenerator().generateLabel(
                            dataset, series);
                    String description = label;
                    String toolTipText = null;
                    if (getLegendItemToolTipGenerator() != null) {
                        toolTipText 
                            = getLegendItemToolTipGenerator().generateLabel(
                                    dataset, series);
                    }
                    String urlText = null;
                    if (getLegendItemURLGenerator() != null) {
                        urlText = getLegendItemURLGenerator().generateLabel(
                                dataset, series);
                    }
                    Paint paint = lookupSeriesPaint(series);
                    Stroke stroke = lookupSeriesStroke(series);
                    // TODO:  the following hard-coded line needs generalising
                    Line2D line = new Line2D.Double(-7.0, 0.0, 7.0, 0.0);
                    result = new LegendItem(label, description, 
                            toolTipText, urlText, line, stroke, paint);
                    result.setDataset(dataset);
                    result.setDatasetIndex(datasetIndex);
                    result.setSeriesKey(dataset.getSeriesKey(series));
                    result.setSeriesIndex(series);
                }
            }

        }

        return result;

    }

    /**
     * Tests this renderer for equality with an arbitrary object.
     * 
     * @param obj  the object (<code>null</code> permitted).
     * 
     * @return A boolean.
     */    
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;   
        }
        if (!(obj instanceof XYDifferenceRenderer)) {
            return false;   
        }
        if (!super.equals(obj)) {
            return false;   
        }
        XYDifferenceRenderer that = (XYDifferenceRenderer) obj;
        if (!PaintUtilities.equal(this.positivePaint, that.positivePaint)) {
            return false;   
        }
        if (!PaintUtilities.equal(this.negativePaint, that.negativePaint)) {
            return false;   
        }
        if (this.shapesVisible != that.shapesVisible) {
            return false;   
        }
        if (!ShapeUtilities.equal(this.legendLine, that.legendLine)) {
            return false;   
        }
        if (this.roundXCoordinates != that.roundXCoordinates) {
            return false;
        }
        return true;
    }
    
    /**
     * Returns a clone of the renderer.
     * 
     * @return A clone.
     * 
     * @throws CloneNotSupportedException  if the renderer cannot be cloned.
     */
    public Object clone() throws CloneNotSupportedException {
        XYDifferenceRenderer clone = (XYDifferenceRenderer) super.clone();
        clone.legendLine = ShapeUtilities.clone(this.legendLine);
        return clone;
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException  if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        SerialUtilities.writePaint(this.positivePaint, stream);
        SerialUtilities.writePaint(this.negativePaint, stream);
        SerialUtilities.writeShape(this.legendLine, stream);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream) 
        throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        this.positivePaint = SerialUtilities.readPaint(stream);
        this.negativePaint = SerialUtilities.readPaint(stream);
        this.legendLine = SerialUtilities.readShape(stream);
    }

}