xydifferencerenderer.java

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    /**
     * Returns <code>2</code>, the number of passes required by the renderer.  
     * The {@link XYPlot} will run through the dataset this number of times.
     * 
     * @return The number of passes required by the renderer.
     */
    public int getPassCount() {
        return 2;
    }
    
    /**
     * Draws the visual representation of a single data item.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the area within which the data is being drawn.
     * @param info  collects information about the drawing.
     * @param plot  the plot (can be used to obtain standard color 
     *              information etc).
     * @param domainAxis  the domain (horizontal) axis.
     * @param rangeAxis  the range (vertical) axis.
     * @param dataset  the dataset.
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     * @param crosshairState  crosshair information for the plot 
     *                        (<code>null</code> permitted).
     * @param pass  the pass index.
     */
    public void drawItem(Graphics2D g2,
                         XYItemRendererState state,
                         Rectangle2D dataArea,
                         PlotRenderingInfo info,
                         XYPlot plot,
                         ValueAxis domainAxis,
                         ValueAxis rangeAxis,
                         XYDataset dataset,
                         int series,
                         int item,
                         CrosshairState crosshairState,
                         int pass) {

        if (pass == 0) {
            drawItemPass0(g2, dataArea, info, plot, domainAxis, rangeAxis, 
                    dataset, series, item, crosshairState);
        }
        else if (pass == 1) {
            drawItemPass1(g2, dataArea, info, plot, domainAxis, rangeAxis, 
                    dataset, series, item, crosshairState);
        }

    }

    /**
     * Draws the visual representation of a single data item, first pass.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area within which the data is being drawn.
     * @param info  collects information about the drawing.
     * @param plot  the plot (can be used to obtain standard color 
     *              information etc).
     * @param domainAxis  the domain (horizontal) axis.
     * @param rangeAxis  the range (vertical) axis.
     * @param dataset  the dataset.
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     * @param crosshairState  crosshair information for the plot 
     *                        (<code>null</code> permitted).
     */
    protected void drawItemPass0(Graphics2D g2,
                                 Rectangle2D dataArea,
                                 PlotRenderingInfo info,
                                 XYPlot plot,
                                 ValueAxis domainAxis,
                                 ValueAxis rangeAxis,
                                 XYDataset dataset,
                                 int series,
                                 int item,
                                 CrosshairState crosshairState) {

        if (series == 0) {

            PlotOrientation orientation = plot.getOrientation();
            RectangleEdge domainAxisLocation = plot.getDomainAxisEdge();
            RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();
            
            double y0 = dataset.getYValue(0, item);
            double x1 = dataset.getXValue(1, item);
            double y1 = dataset.getYValue(1, item);

            double transY0 = rangeAxis.valueToJava2D(y0, dataArea, 
                    rangeAxisLocation);
            double transX1 = domainAxis.valueToJava2D(x1, dataArea, 
                    domainAxisLocation);
            if (this.roundXCoordinates) {
                transX1 = Math.rint(transX1);
            }
            double transY1 = rangeAxis.valueToJava2D(y1, dataArea, 
                    rangeAxisLocation);

            if (item > 0) {
                double prevx0 = dataset.getXValue(0, item - 1);
                double prevy0 = dataset.getYValue(0, item - 1);
                double prevy1 = dataset.getYValue(1, item - 1);

                double prevtransX0 = domainAxis.valueToJava2D(prevx0, dataArea, 
                        domainAxisLocation);
                if (this.roundXCoordinates) {
                    prevtransX0 = Math.rint(prevtransX0);
                }
                double prevtransY0 = rangeAxis.valueToJava2D(prevy0, dataArea, 
                        rangeAxisLocation);
                double prevtransY1 = rangeAxis.valueToJava2D(prevy1, dataArea, 
                        rangeAxisLocation);

                Shape positive = getPositiveArea((float) prevtransX0, 
                        (float) prevtransY0, (float) prevtransY1,
                        (float) transX1, (float) transY0, (float) transY1,
                        orientation);
                if (positive != null) {
                    g2.setPaint(getPositivePaint());
                    g2.fill(positive);
                }

                Shape negative = getNegativeArea((float) prevtransX0, 
                        (float) prevtransY0, (float) prevtransY1,
                        (float) transX1, (float) transY0, (float) transY1,
                        orientation);

                if (negative != null) {
                    g2.setPaint(getNegativePaint());
                    g2.fill(negative);
                }
            }
        }

    }

    /**
     * Draws the visual representation of a single data item, second pass.  In 
     * the second pass, the renderer draws the lines and shapes for the 
     * individual points in the two series.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area within which the data is being drawn.
     * @param info  collects information about the drawing.
     * @param plot  the plot (can be used to obtain standard color information 
     *              etc).
     * @param domainAxis  the domain (horizontal) axis.
     * @param rangeAxis  the range (vertical) axis.
     * @param dataset  the dataset.
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     * @param crosshairState  crosshair information for the plot 
     *                        (<code>null</code> permitted).
     */
    protected void drawItemPass1(Graphics2D g2,
                                 Rectangle2D dataArea,
                                 PlotRenderingInfo info,
                                 XYPlot plot,
                                 ValueAxis domainAxis,
                                 ValueAxis rangeAxis,
                                 XYDataset dataset,
                                 int series,
                                 int item,
                                 CrosshairState crosshairState) {

        Shape entityArea = null;
        EntityCollection entities = null;
        if (info != null) {
            entities = info.getOwner().getEntityCollection();
        }

        Paint seriesPaint = getItemPaint(series, item);
        Stroke seriesStroke = getItemStroke(series, item);
        g2.setPaint(seriesPaint);
        g2.setStroke(seriesStroke);

        if (series == 0) {

            PlotOrientation orientation = plot.getOrientation(); 
            RectangleEdge domainAxisLocation = plot.getDomainAxisEdge();
            RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();

            double x0 = dataset.getXValue(0, item);
            double y0 = dataset.getYValue(0, item);
            double x1 = dataset.getXValue(1, item);
            double y1 = dataset.getYValue(1, item);

            double transX0 = domainAxis.valueToJava2D(x0, dataArea, 
                    domainAxisLocation);
            double transY0 = rangeAxis.valueToJava2D(y0, dataArea, 
                    rangeAxisLocation);
            double transX1 = domainAxis.valueToJava2D(x1, dataArea, 
                    domainAxisLocation);
            double transY1 = rangeAxis.valueToJava2D(y1, dataArea, 
                    rangeAxisLocation);

            if (item > 0) {
                // get the previous data points...
                double prevx0 = dataset.getXValue(0, item - 1);
                double prevy0 = dataset.getYValue(0, item - 1);
                double prevx1 = dataset.getXValue(1, item - 1);
                double prevy1 = dataset.getYValue(1, item - 1);

                double prevtransX0 = domainAxis.valueToJava2D(prevx0, dataArea,
                        domainAxisLocation);
                double prevtransY0 = rangeAxis.valueToJava2D(prevy0, dataArea, 
                        rangeAxisLocation);
                double prevtransX1 = domainAxis.valueToJava2D(prevx1, dataArea, 
                        domainAxisLocation);
                double prevtransY1 = rangeAxis.valueToJava2D(prevy1, dataArea, 
                        rangeAxisLocation);

                Line2D line0 = null;
                Line2D line1 = null;
                if (orientation == PlotOrientation.HORIZONTAL) {
                    line0 = new Line2D.Double(transY0, transX0, prevtransY0, 
                            prevtransX0);
                    line1 = new Line2D.Double(transY1, transX1, prevtransY1, 
                            prevtransX1);
                }
                else if (orientation == PlotOrientation.VERTICAL) {
                    line0 = new Line2D.Double(transX0, transY0, prevtransX0, 
                            prevtransY0);
                    line1 = new Line2D.Double(transX1, transY1, prevtransX1, 
                            prevtransY1);
                }
                if (line0 != null && line0.intersects(dataArea)) {
                    g2.setPaint(getItemPaint(series, item));
                    g2.setStroke(getItemStroke(series, item));
                    g2.draw(line0);
                }
                if (line1 != null && line1.intersects(dataArea)) {
                    g2.setPaint(getItemPaint(1, item));
                    g2.setStroke(getItemStroke(1, item));
                    g2.draw(line1);
                }
            }

            if (getShapesVisible()) {
                Shape shape0 = getItemShape(series, item);
                if (orientation == PlotOrientation.HORIZONTAL) {
                    shape0 = ShapeUtilities.createTranslatedShape(shape0, 
                            transY0, transX0);
                }
                else {  // vertical
                    shape0 = ShapeUtilities.createTranslatedShape(shape0, 
                            transX0, transY0);
                }
                if (shape0.intersects(dataArea)) {
                    g2.setPaint(getItemPaint(series, item));
                    g2.fill(shape0);
                }
                entityArea = shape0;

                // add an entity for the item...
                if (entities != null) {
                    if (entityArea == null) {
                        entityArea = new Rectangle2D.Double(transX0 - 2, 
                                transY0 - 2, 4, 4);
                    }
                    String tip = null;
                    XYToolTipGenerator generator = getToolTipGenerator(series, 
                            item);
                    if (generator != null) {
                        tip = generator.generateToolTip(dataset, series, item);
                    }
                    String url = null;
                    if (getURLGenerator() != null) {
                        url = getURLGenerator().generateURL(dataset, series, 
                                item);
                    }
                    XYItemEntity entity = new XYItemEntity(entityArea, dataset, 
                            series, item, tip, url);
                    entities.add(entity);
                }

                Shape shape1 = getItemShape(series + 1, item);
                if (orientation == PlotOrientation.HORIZONTAL) {
                    shape1 = ShapeUtilities.createTranslatedShape(shape1, 
                            transY1, transX1);
                }
                else {  // vertical
                    shape1 = ShapeUtilities.createTranslatedShape(shape1, 
                            transX1, transY1);
                }
                if (shape1.intersects(dataArea)) {
                    g2.setPaint(getItemPaint(series + 1, item));
                    g2.fill(shape1);
                }
                entityArea = shape1;

                // add an entity for the item...
                if (entities != null) {
                    if (entityArea == null) {
                        entityArea = new Rectangle2D.Double(transX1 - 2, 
                                transY1 - 2, 4, 4);
                    }
                    String tip = null;
                    XYToolTipGenerator generator = getToolTipGenerator(series, 
                            item);
                    if (generator != null) {
                        tip = generator.generateToolTip(dataset, series + 1, 
                                item);
                    }
                    String url = null;
                    if (getURLGenerator() != null) {
                        url = getURLGenerator().generateURL(dataset, 
                                series + 1, item);
                    }
                    XYItemEntity entity = new XYItemEntity(entityArea, dataset, 
                            series + 1, item, tip, url);
                    entities.add(entity);
                }
            }
            
            int domainAxisIndex = plot.getDomainAxisIndex(domainAxis);
            int rangeAxisIndex = plot.getRangeAxisIndex(rangeAxis);
            updateCrosshairValues(crosshairState, x1, y1, domainAxisIndex, 
                    rangeAxisIndex, transX1, transY1, orientation);
            updateCrosshairValues(crosshairState, x0, y0, domainAxisIndex, 
                    rangeAxisIndex, transX0, transY0, orientation);
        }

    }

    /**
     * Returns the positive area for a crossover point.
     * 
     * @param x0  x coordinate.
     * @param y0A  y coordinate A.
     * @param y0B  y coordinate B.
     * @param x1  x coordinate.
     * @param y1A  y coordinate A.