stackedxybarrenderer.java

JFreeChart它主要是用来制作各种各样的图表

     *              etc).
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range 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 (!(dataset instanceof IntervalXYDataset
                && dataset instanceof TableXYDataset)) {
            String message = "dataset (type " + dataset.getClass().getName()
                + ") has wrong type:";
            boolean and = false;
            if (!IntervalXYDataset.class.isAssignableFrom(dataset.getClass())) {
                message += " it is no IntervalXYDataset";
                and = true;
            }
            if (!TableXYDataset.class.isAssignableFrom(dataset.getClass())) {
                if (and) {
                    message += " and";
                }
                message += " it is no TableXYDataset";
            }

            throw new IllegalArgumentException(message);
        }

        IntervalXYDataset intervalDataset = (IntervalXYDataset) dataset;
        double value = intervalDataset.getYValue(series, item);
        if (Double.isNaN(value)) {
            return;
        }

        // if we are rendering the values as percentages, we need to calculate
        // the total for the current item.  Unfortunately here we end up
        // repeating the calculation more times than is strictly necessary -
        // hopefully I'll come back to this and find a way to add the
        // total(s) to the renderer state.  The other problem is we implicitly
        // assume the dataset has no negative values...perhaps that can be
        // fixed too.
        double total = 0.0;
        if (this.renderAsPercentages) {
            total = DatasetUtilities.calculateStackTotal(
                    (TableXYDataset) dataset, item);
            value = value / total;
        }

        double positiveBase = 0.0;
        double negativeBase = 0.0;

        for (int i = 0; i < series; i++) {
            double v = dataset.getYValue(i, item);
            if (!Double.isNaN(v)) {
                if (this.renderAsPercentages) {
                    v = v / total;
                }
                if (v > 0) {
                    positiveBase = positiveBase + v;
                }
                else {
                    negativeBase = negativeBase + v;
                }
            }
        }

        double translatedBase;
        double translatedValue;
        RectangleEdge edgeR = plot.getRangeAxisEdge();
        if (value > 0.0) {
            translatedBase = rangeAxis.valueToJava2D(positiveBase, dataArea,
                    edgeR);
            translatedValue = rangeAxis.valueToJava2D(positiveBase + value,
                    dataArea, edgeR);
        }
        else {
            translatedBase = rangeAxis.valueToJava2D(negativeBase, dataArea,
                    edgeR);
            translatedValue = rangeAxis.valueToJava2D(negativeBase + value,
                    dataArea, edgeR);
        }

        RectangleEdge edgeD = plot.getDomainAxisEdge();
        double startX = intervalDataset.getStartXValue(series, item);
        if (Double.isNaN(startX)) {
            return;
        }
        double translatedStartX = domainAxis.valueToJava2D(startX, dataArea,
                edgeD);

        double endX = intervalDataset.getEndXValue(series, item);
        if (Double.isNaN(endX)) {
            return;
        }
        double translatedEndX = domainAxis.valueToJava2D(endX, dataArea, edgeD);

        double translatedWidth = Math.max(1, Math.abs(translatedEndX
                - translatedStartX));
        double translatedHeight = Math.abs(translatedValue - translatedBase);
        if (getMargin() > 0.0) {
            double cut = translatedWidth * getMargin();
            translatedWidth = translatedWidth - cut;
            translatedStartX = translatedStartX + cut / 2;
        }

        Rectangle2D bar = null;
        PlotOrientation orientation = plot.getOrientation();
        if (orientation == PlotOrientation.HORIZONTAL) {
            bar = new Rectangle2D.Double(Math.min(translatedBase,
                    translatedValue), translatedEndX, translatedHeight,
                    translatedWidth);
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            bar = new Rectangle2D.Double(translatedStartX,
                    Math.min(translatedBase, translatedValue),
                    translatedWidth, translatedHeight);
        }
        boolean positive = (value > 0.0);
        boolean inverted = rangeAxis.isInverted();
        RectangleEdge barBase;
        if (orientation == PlotOrientation.HORIZONTAL) {
            if (positive && inverted || !positive && !inverted) {
                barBase = RectangleEdge.RIGHT;
            }
            else {
                barBase = RectangleEdge.LEFT;
            }
        }
        else {
            if (positive && !inverted || !positive && inverted) {
                barBase = RectangleEdge.BOTTOM;
            }
            else {
                barBase = RectangleEdge.TOP;
            }
        }

        if (pass == 0) {
            getBarPainter().paintBarShadow(g2, this, series, item, bar, barBase,
                    false);
        }
        else if (pass == 1) {
            getBarPainter().paintBar(g2, this, series, item, bar, barBase);

            // add an entity for the item...
            if (info != null) {
                EntityCollection entities = info.getOwner()
                        .getEntityCollection();
                if (entities != null) {
                    addEntity(entities, bar, dataset, series, item,
                            bar.getCenterX(), bar.getCenterY());
                }
            }
        }
        else if (pass == 2) {
            // handle item label drawing, now that we know all the bars have
            // been drawn...
            if (isItemLabelVisible(series, item)) {
                XYItemLabelGenerator generator = getItemLabelGenerator(series,
                        item);
                drawItemLabel(g2, dataset, series, item, plot, generator, bar,
                        value < 0.0);
            }
        }

    }

    /**
     * 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 StackedXYBarRenderer)) {
            return false;
        }
        StackedXYBarRenderer that = (StackedXYBarRenderer) obj;
        if (this.renderAsPercentages != that.renderAsPercentages) {
            return false;
        }
        return super.equals(obj);
    }

    /**
     * Returns a hash code for this instance.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result = super.hashCode();
        result = result * 37 + (this.renderAsPercentages ? 1 : 0);
        return result;
    }

}