xybarrenderer.java

java图形利器

     * gradient paint objects to fit each bar).
     * 
     * @return A transformer (<code>null</code> possible).
     * 
     * @see #setGradientPaintTransformer(GradientPaintTransformer)
     */    
    public GradientPaintTransformer getGradientPaintTransformer() {
        return this.gradientPaintTransformer;    
    }
    
    /**
     * Sets the gradient paint transformer and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param transformer  the transformer (<code>null</code> permitted).
     * 
     * @see #getGradientPaintTransformer()
     */
    public void setGradientPaintTransformer(
            GradientPaintTransformer transformer) {
        this.gradientPaintTransformer = transformer;
        notifyListeners(new RendererChangeEvent(this));
    }
     
    /**
     * Returns the shape used to represent bars in each legend item.
     * 
     * @return The shape used to represent bars in each legend item (never 
     *         <code>null</code>).
     *         
     * @see #setLegendBar(Shape)
     */
    public Shape getLegendBar() {
        return this.legendBar;
    }
    
    /**
     * Sets the shape used to represent bars in each legend item and sends a
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param bar  the bar shape (<code>null</code> not permitted).
     * 
     * @see #getLegendBar()
     */
    public void setLegendBar(Shape bar) {
        if (bar == null) {
            throw new IllegalArgumentException("Null 'bar' argument.");
        }
        this.legendBar = bar;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the fallback position for positive item labels that don't fit 
     * within a bar.
     * 
     * @return The fallback position (<code>null</code> possible).
     * 
     * @see #setPositiveItemLabelPositionFallback(ItemLabelPosition)
     * @since 1.0.2
     */
    public ItemLabelPosition getPositiveItemLabelPositionFallback() {
        return this.positiveItemLabelPositionFallback;
    }
    
    /**
     * Sets the fallback position for positive item labels that don't fit 
     * within a bar, and sends a {@link RendererChangeEvent} to all registered
     * listeners.
     * 
     * @param position  the position (<code>null</code> permitted).
     * 
     * @see #getPositiveItemLabelPositionFallback()
     * @since 1.0.2
     */
    public void setPositiveItemLabelPositionFallback(
            ItemLabelPosition position) {
        this.positiveItemLabelPositionFallback = position;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the fallback position for negative item labels that don't fit 
     * within a bar.
     * 
     * @return The fallback position (<code>null</code> possible).
     * 
     * @see #setNegativeItemLabelPositionFallback(ItemLabelPosition)
     * @since 1.0.2
     */
    public ItemLabelPosition getNegativeItemLabelPositionFallback() {
        return this.negativeItemLabelPositionFallback;
    }
    
    /**
     * Sets the fallback position for negative item labels that don't fit 
     * within a bar, and sends a {@link RendererChangeEvent} to all registered
     * listeners.
     * 
     * @param position  the position (<code>null</code> permitted).
     * 
     * @see #getNegativeItemLabelPositionFallback()
     * @since 1.0.2
     */
    public void setNegativeItemLabelPositionFallback(
            ItemLabelPosition position) {
        this.negativeItemLabelPositionFallback = position;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Initialises the renderer and returns a state object that should be 
     * passed to all subsequent calls to the drawItem() method.  Here we 
     * calculate the Java2D y-coordinate for zero, since all the bars have 
     * their bases fixed at zero.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area inside the axes.
     * @param plot  the plot.
     * @param dataset  the data.
     * @param info  an optional info collection object to return data back to 
     *              the caller.
     *
     * @return A state object.
     */
    public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea,
            XYPlot plot, XYDataset dataset, PlotRenderingInfo info) {

        XYBarRendererState state = new XYBarRendererState(info);
        ValueAxis rangeAxis = plot.getRangeAxisForDataset(plot.indexOf(
                dataset));
        state.setG2Base(rangeAxis.valueToJava2D(this.base, dataArea, 
                plot.getRangeAxisEdge()));
        return state;

    }

    /**
     * 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 xyplot = getPlot();
        if (xyplot != null) {
            XYDataset dataset = xyplot.getDataset(datasetIndex);
            if (dataset != null) {
                XYSeriesLabelGenerator lg = getLegendItemLabelGenerator();
                String label = lg.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);
                }
                Shape shape = this.legendBar;
                Paint paint = lookupSeriesPaint(series);
                Paint outlinePaint = lookupSeriesOutlinePaint(series);
                Stroke outlineStroke = lookupSeriesOutlineStroke(series);
                if (this.drawBarOutline) {
                    result = new LegendItem(label, description, toolTipText, 
                            urlText, shape, paint, outlineStroke, outlinePaint);
                }
                else {
                    result = new LegendItem(label, description, toolTipText, 
                            urlText, shape, paint);
                }
                result.setDataset(dataset);
                result.setDatasetIndex(datasetIndex);
                result.setSeriesKey(dataset.getSeriesKey(series));
                result.setSeriesIndex(series);
                if (getGradientPaintTransformer() != null) {
                    result.setFillPaintTransformer(
                            getGradientPaintTransformer());
                }
            }
        }
        return result;
    }
    
    /**
     * 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 plot 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 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 (!getItemVisible(series, item)) {
            return;   
        }
        IntervalXYDataset intervalDataset = (IntervalXYDataset) dataset;

        double value0;
        double value1;
        if (this.useYInterval) {
            value0 = intervalDataset.getStartYValue(series, item);
            value1 = intervalDataset.getEndYValue(series, item);
        }
        else {
            value0 = this.base;
            value1 = intervalDataset.getYValue(series, item);
        }
        if (Double.isNaN(value0) || Double.isNaN(value1)) {
            return;
        }
        if (value0 <= value1) {
            if (!rangeAxis.getRange().intersects(value0, value1)) {
                return;
            }
        }
        else {
            if (!rangeAxis.getRange().intersects(value1, value0)) {
                return;
            }
        }

        double translatedValue0 = rangeAxis.valueToJava2D(value0, dataArea, 
                plot.getRangeAxisEdge());
        double translatedValue1 = rangeAxis.valueToJava2D(value1, dataArea, 
                plot.getRangeAxisEdge());
        double bottom = Math.min(translatedValue0, translatedValue1);
        double top = Math.max(translatedValue0, translatedValue1);

        double startX = intervalDataset.getStartXValue(series, item);
        if (Double.isNaN(startX)) {
            return;
        }
        double endX = intervalDataset.getEndXValue(series, item);
        if (Double.isNaN(endX)) {
            return;
        }
        if (startX <= endX) {
            if (!domainAxis.getRange().intersects(startX, endX)) {
                return;
            }
        }
        else {
            if (!domainAxis.getRange().intersects(endX, startX)) {
                return;
            }
        }

        RectangleEdge location = plot.getDomainAxisEdge();
        double translatedStartX = domainAxis.valueToJava2D(startX, dataArea, 
                location);
        double translatedEndX = domainAxis.valueToJava2D(endX, dataArea, 
                location);

        double translatedWidth = Math.max(1, Math.abs(translatedEndX 
                - translatedStartX));

        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) {
            // clip left and right bounds to data area
            bottom = Math.max(bottom, dataArea.getMinX());
            top = Math.min(top, dataArea.getMaxX());
            bar = new Rectangle2D.Double(
                bottom, 
                Math.min(translatedStartX, translatedEndX),
                top - bottom, translatedWidth);
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            // clip top and bottom bounds to data area
            bottom = Math.max(bottom, dataArea.getMinY());
            top = Math.min(top, dataArea.getMaxY());
            bar = new Rectangle2D.Double(
                Math.min(translatedStartX, translatedEndX), 
                bottom, 
                translatedWidth, top - bottom);
        }

        Paint itemPaint = getItemPaint(series, item);
        if (getGradientPaintTransformer() 
                != null && itemPaint instanceof GradientPaint) {
            GradientPaint gp = (GradientPaint) itemPaint;
            itemPaint = getGradientPaintTransformer().transform(gp, bar);
        }
        g2.setPaint(itemPaint);
        g2.fill(bar);
        if (isDrawBarOutline() 
                && Math.abs(translatedEndX - translatedStartX) > 3) {
            Stroke stroke = getItemOutlineStroke(series, item);
            Paint paint = getItemOutlinePaint(series, item);
            if (stroke != null && paint != null) {
                g2.setStroke(stroke);
                g2.setPaint(paint);
                g2.draw(bar);                
            }
        }
        
        if (isItemLabelVisible(series, item)) {
            XYItemLabelGenerator generator = getItemLabelGenerator(series, 
                    item);
            drawItemLabel(g2, dataset, series, item, plot, generator, bar, 
                    value1 < 0.0);
        }

        // update the crosshair point
        double x1 = (startX + endX) / 2.0;
        double y1 = dataset.getYValue(series, item);
        double transX1 = domainAxis.valueToJava2D(x1, dataArea, location);
        double transY1 = rangeAxis.valueToJava2D(y1, dataArea, 
                plot.getRangeAxisEdge());
        int domainAxisIndex = plot.getDomainAxisIndex(domainAxis);