barrenderer.java

java图形利器

    /**
     * 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)
     */
    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()
     */
    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 #setPositiveItemLabelPositionFallback(ItemLabelPosition)
     */
    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()
     */
    public void setNegativeItemLabelPositionFallback(
            ItemLabelPosition position) {
        this.negativeItemLabelPositionFallback = position;
        notifyListeners(new RendererChangeEvent(this));
    }
    
    /**
     * Returns the flag that controls whether or not the base value for the 
     * bars is included in the range calculated by 
     * {@link #findRangeBounds(CategoryDataset)}.
     * 
     * @return <code>true</code> if the base is included in the range, and
     *         <code>false</code> otherwise.
     * 
     * @since 1.0.1
     * 
     * @see #setIncludeBaseInRange(boolean)
     */
    public boolean getIncludeBaseInRange() {
        return this.includeBaseInRange;
    }
    
    /**
     * Sets the flag that controls whether or not the base value for the bars 
     * is included in the range calculated by 
     * {@link #findRangeBounds(CategoryDataset)}.  If the flag is changed,
     * a {@link RendererChangeEvent} is sent to all registered listeners.
     * 
     * @param include  the new value for the flag.
     * 
     * @since 1.0.1
     * 
     * @see #getIncludeBaseInRange()
     */
    public void setIncludeBaseInRange(boolean include) {
        if (this.includeBaseInRange != include) {
            this.includeBaseInRange = include;
            notifyListeners(new RendererChangeEvent(this));
        }
    }
    
    /**
     * Returns the lower clip value.  This value is recalculated in the 
     * initialise() method.
     *
     * @return The value.
     */
    public double getLowerClip() {
        // TODO:  this attribute should be transferred to the renderer state.
        return this.lowerClip;
    }

    /**
     * Returns the upper clip value.  This value is recalculated in the 
     * initialise() method.
     *
     * @return The value.
     */
    public double getUpperClip() {
        // TODO:  this attribute should be transferred to the renderer state.
        return this.upperClip;
    }

    /**
     * Initialises the renderer and returns a state object that will be passed 
     * to subsequent calls to the drawItem method.  This method gets called 
     * once at the start of the process of drawing a chart.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area in which the data is to be plotted.
     * @param plot  the plot.
     * @param rendererIndex  the renderer index.
     * @param info  collects chart rendering information for return to caller.
     * 
     * @return The renderer state.
     */
    public CategoryItemRendererState initialise(Graphics2D g2,
                                                Rectangle2D dataArea,
                                                CategoryPlot plot,
                                                int rendererIndex,
                                                PlotRenderingInfo info) {

        CategoryItemRendererState state = super.initialise(g2, dataArea, plot, 
                rendererIndex, info);

        // get the clipping values...
        ValueAxis rangeAxis = plot.getRangeAxisForDataset(rendererIndex);
        this.lowerClip = rangeAxis.getRange().getLowerBound();
        this.upperClip = rangeAxis.getRange().getUpperBound();

        // calculate the bar width
        calculateBarWidth(plot, dataArea, rendererIndex, state);

        return state;
        
    }
    
    /**
     * Calculates the bar width and stores it in the renderer state.
     * 
     * @param plot  the plot.
     * @param dataArea  the data area.
     * @param rendererIndex  the renderer index.
     * @param state  the renderer state.
     */
    protected void calculateBarWidth(CategoryPlot plot, 
                                     Rectangle2D dataArea, 
                                     int rendererIndex,
                                     CategoryItemRendererState state) {
                                         
        CategoryAxis domainAxis = getDomainAxis(plot, rendererIndex);
        CategoryDataset dataset = plot.getDataset(rendererIndex);
        if (dataset != null) {
            int columns = dataset.getColumnCount();
            int rows = dataset.getRowCount();
            double space = 0.0;
            PlotOrientation orientation = plot.getOrientation();
            if (orientation == PlotOrientation.HORIZONTAL) {
                space = dataArea.getHeight();
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                space = dataArea.getWidth();
            }
            double maxWidth = space * getMaximumBarWidth();
            double categoryMargin = 0.0;
            double currentItemMargin = 0.0;
            if (columns > 1) {
                categoryMargin = domainAxis.getCategoryMargin();
            }
            if (rows > 1) {
                currentItemMargin = getItemMargin();
            }
            double used = space * (1 - domainAxis.getLowerMargin() 
                                     - domainAxis.getUpperMargin()
                                     - categoryMargin - currentItemMargin);
            if ((rows * columns) > 0) {
                state.setBarWidth(Math.min(used / (rows * columns), maxWidth));
            }
            else {
                state.setBarWidth(Math.min(used, maxWidth));
            }
        }
    }

    /**
     * Calculates the coordinate of the first "side" of a bar.  This will be 
     * the minimum x-coordinate for a vertical bar, and the minimum 
     * y-coordinate for a horizontal bar.
     *
     * @param plot  the plot.
     * @param orientation  the plot orientation.
     * @param dataArea  the data area.
     * @param domainAxis  the domain axis.
     * @param state  the renderer state (has the bar width precalculated).
     * @param row  the row index.
     * @param column  the column index.
     * 
     * @return The coordinate.
     */
    protected double calculateBarW0(CategoryPlot plot, 
                                    PlotOrientation orientation, 
                                    Rectangle2D dataArea,
                                    CategoryAxis domainAxis,
                                    CategoryItemRendererState state,
                                    int row,
                                    int column) {
        // calculate bar width...
        double space = 0.0;
        if (orientation == PlotOrientation.HORIZONTAL) {
            space = dataArea.getHeight();
        }
        else {
            space = dataArea.getWidth();
        }
        double barW0 = domainAxis.getCategoryStart(column, getColumnCount(), 
                dataArea, plot.getDomainAxisEdge());
        int seriesCount = getRowCount();
        int categoryCount = getColumnCount();
        if (seriesCount > 1) {
            double seriesGap = space * getItemMargin() 
                               / (categoryCount * (seriesCount - 1));
            double seriesW = calculateSeriesWidth(space, domainAxis, 
                    categoryCount, seriesCount);
            barW0 = barW0 + row * (seriesW + seriesGap) 
                          + (seriesW / 2.0) - (state.getBarWidth() / 2.0);
        }
        else {
            barW0 = domainAxis.getCategoryMiddle(column, getColumnCount(), 
                    dataArea, plot.getDomainAxisEdge()) - state.getBarWidth() 
                    / 2.0;
        }
        return barW0;
    }
    
    /**
     * Calculates the coordinates for the length of a single bar.
     * 
     * @param value  the value represented by the bar.
     * 
     * @return The coordinates for each end of the bar (or <code>null</code> if 
     *         the bar is not visible for the current axis range).
     */
    protected double[] calculateBarL0L1(double value) {
        double lclip = getLowerClip();
        double uclip = getUpperClip();
        double barLow = Math.min(this.base, value);
        double barHigh = Math.max(this.base, value);
        if (barHigh < lclip) {  // bar is not visible
            return null;
        }
        if (barLow > uclip) {   // bar is not visible
            return null;
        }
        barLow = Math.max(barLow, lclip);
        barHigh = Math.min(barHigh, uclip);
        return new double[] {barLow, barHigh};
    }

    /**
     * Returns the range of values the renderer requires to display all the 
     * items from the specified dataset.  This takes into account the range
     * of values in the dataset, plus the flag that determines whether or not
     * the base value for the bars should be included in the range.
     * 
     * @param dataset  the dataset (<code>null</code> permitted).
     * 
     * @return The range (or <code>null</code> if the dataset is 
     *         <code>null</code> or empty).
     */
    public Range findRangeBounds(CategoryDataset dataset) {
        Range result = DatasetUtilities.findRangeBounds(dataset);
        if (result != null) {
            if (this.includeBaseInRange) {
                result = Range.expandToInclude(result, this.base);
            }
        }
        return result;
    }

    /**
     * Returns a legend item for a series.
     *
     * @param datasetIndex  the dataset index (zero-based).
     * @param series  the series index (zero-based).
     *
     * @return The legend item (possibly <code>null</code>).
     */
    public LegendItem getLegendItem(int datasetIndex, int series) {

        CategoryPlot cp = getPlot();
        if (cp == null) {
            return null;
        }

        // check that a legend item needs to be displayed...
        if (!isSeriesVisible(series) || !isSeriesVisibleInLegend(series)) {
            return null;
        }

        CategoryDataset dataset = cp.getDataset(datasetIndex);
        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);   
        }
        Shape shape = new Rectangle2D.Double(-4.0, -4.0, 8.0, 8.0);
        Paint paint = lookupSeriesPaint(series);
        Paint outlinePaint = lookupSeriesOutlinePaint(series);
        Stroke outlineStroke = lookupSeriesOutlineStroke(series);

        LegendItem result = new LegendItem(label, description, toolTipText, 
                urlText, true, shape, true, paint, isDrawBarOutline(), 
                outlinePaint, outlineStroke, false, new Line2D.Float(), 
                new BasicStroke(1.0f), Color.black);
        result.setDataset(dataset);
        result.setDatasetIndex(datasetIndex);
        result.setSeriesKey(dataset.getRowKey(series));
        result.setSeriesIndex(series);
        if (this.gradientPaintTransformer != null) {
            result.setFillPaintTransformer(this.gradientPaintTransformer);
        }
        return result;
    }

    /**
     * Draws the bar for a single (series, category) data item.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @param dataArea  the data area.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the dataset.
     * @param row  the row index (zero-based).
     * @param column  the column index (zero-based).
     * @param pass  the pass index.
     */
    public void drawItem(Graphics2D g2,
                         CategoryItemRendererState state,
                         Rectangle2D dataArea,
                         CategoryPlot plot,
                         CategoryAxis domainAxis,