multiplepieplot.java

jfreechart-1.0.12.zip 可以用来作图

        return "Multiple Pie Plot";
         // TODO: need to fetch this from localised resources
    }

    /**
     * Returns the shape used for legend items.
     *
     * @return The shape (never <code>null</code>).
     *
     * @see #setLegendItemShape(Shape)
     *
     * @since 1.0.12
     */
    public Shape getLegendItemShape() {
        return this.legendItemShape;
    }

    /**
     * Sets the shape used for legend items and sends a {@link PlotChangeEvent}
     * to all registered listeners.
     *
     * @param shape  the shape (<code>null</code> not permitted).
     *
     * @see #getLegendItemShape()
     *
     * @since 1.0.12
     */
    public void setLegendItemShape(Shape shape) {
        if (shape == null) {
            throw new IllegalArgumentException("Null 'shape' argument.");
        }
        this.legendItemShape = shape;
        fireChangeEvent();
    }

    /**
     * Draws the plot on a Java 2D graphics device (such as the screen or a
     * printer).
     *
     * @param g2  the graphics device.
     * @param area  the area within which the plot should be drawn.
     * @param anchor  the anchor point (<code>null</code> permitted).
     * @param parentState  the state from the parent plot, if there is one.
     * @param info  collects info about the drawing.
     */
    public void draw(Graphics2D g2,
                     Rectangle2D area,
                     Point2D anchor,
                     PlotState parentState,
                     PlotRenderingInfo info) {


        // adjust the drawing area for the plot insets (if any)...
        RectangleInsets insets = getInsets();
        insets.trim(area);
        drawBackground(g2, area);
        drawOutline(g2, area);

        // check that there is some data to display...
        if (DatasetUtilities.isEmptyOrNull(this.dataset)) {
            drawNoDataMessage(g2, area);
            return;
        }

        int pieCount = 0;
        if (this.dataExtractOrder == TableOrder.BY_ROW) {
            pieCount = this.dataset.getRowCount();
        }
        else {
            pieCount = this.dataset.getColumnCount();
        }

        // the columns variable is always >= rows
        int displayCols = (int) Math.ceil(Math.sqrt(pieCount));
        int displayRows
            = (int) Math.ceil((double) pieCount / (double) displayCols);

        // swap rows and columns to match plotArea shape
        if (displayCols > displayRows && area.getWidth() < area.getHeight()) {
            int temp = displayCols;
            displayCols = displayRows;
            displayRows = temp;
        }

        prefetchSectionPaints();

        int x = (int) area.getX();
        int y = (int) area.getY();
        int width = ((int) area.getWidth()) / displayCols;
        int height = ((int) area.getHeight()) / displayRows;
        int row = 0;
        int column = 0;
        int diff = (displayRows * displayCols) - pieCount;
        int xoffset = 0;
        Rectangle rect = new Rectangle();

        for (int pieIndex = 0; pieIndex < pieCount; pieIndex++) {
            rect.setBounds(x + xoffset + (width * column), y + (height * row),
                    width, height);

            String title = null;
            if (this.dataExtractOrder == TableOrder.BY_ROW) {
                title = this.dataset.getRowKey(pieIndex).toString();
            }
            else {
                title = this.dataset.getColumnKey(pieIndex).toString();
            }
            this.pieChart.setTitle(title);

            PieDataset piedataset = null;
            PieDataset dd = new CategoryToPieDataset(this.dataset,
                    this.dataExtractOrder, pieIndex);
            if (this.limit > 0.0) {
                piedataset = DatasetUtilities.createConsolidatedPieDataset(
                        dd, this.aggregatedItemsKey, this.limit);
            }
            else {
                piedataset = dd;
            }
            PiePlot piePlot = (PiePlot) this.pieChart.getPlot();
            piePlot.setDataset(piedataset);
            piePlot.setPieIndex(pieIndex);

            // update the section colors to match the global colors...
            for (int i = 0; i < piedataset.getItemCount(); i++) {
                Comparable key = piedataset.getKey(i);
                Paint p;
                if (key.equals(this.aggregatedItemsKey)) {
                    p = this.aggregatedItemsPaint;
                }
                else {
                    p = (Paint) this.sectionPaints.get(key);
                }
                piePlot.setSectionPaint(key, p);
            }

            ChartRenderingInfo subinfo = null;
            if (info != null) {
                subinfo = new ChartRenderingInfo();
            }
            this.pieChart.draw(g2, rect, subinfo);
            if (info != null) {
                info.getOwner().getEntityCollection().addAll(
                        subinfo.getEntityCollection());
                info.addSubplotInfo(subinfo.getPlotInfo());
            }

            ++column;
            if (column == displayCols) {
                column = 0;
                ++row;

                if (row == displayRows - 1 && diff != 0) {
                    xoffset = (diff * width) / 2;
                }
            }
        }

    }

    /**
     * For each key in the dataset, check the <code>sectionPaints</code>
     * cache to see if a paint is associated with that key and, if not,
     * fetch one from the drawing supplier.  These colors are cached so that
     * the legend and all the subplots use consistent colors.
     */
    private void prefetchSectionPaints() {

        // pre-fetch the colors for each key...this is because the subplots
        // may not display every key, but we need the coloring to be
        // consistent...

        PiePlot piePlot = (PiePlot) getPieChart().getPlot();

        if (this.dataExtractOrder == TableOrder.BY_ROW) {
            // column keys provide potential keys for individual pies
            for (int c = 0; c < this.dataset.getColumnCount(); c++) {
                Comparable key = this.dataset.getColumnKey(c);
                Paint p = piePlot.getSectionPaint(key);
                if (p == null) {
                    p = (Paint) this.sectionPaints.get(key);
                    if (p == null) {
                        p = getDrawingSupplier().getNextPaint();
                    }
                }
                this.sectionPaints.put(key, p);
            }
        }
        else {
            // row keys provide potential keys for individual pies
            for (int r = 0; r < this.dataset.getRowCount(); r++) {
                Comparable key = this.dataset.getRowKey(r);
                Paint p = piePlot.getSectionPaint(key);
                if (p == null) {
                    p = (Paint) this.sectionPaints.get(key);
                    if (p == null) {
                        p = getDrawingSupplier().getNextPaint();
                    }
                }
                this.sectionPaints.put(key, p);
            }
        }

    }

    /**
     * Returns a collection of legend items for the pie chart.
     *
     * @return The legend items.
     */
    public LegendItemCollection getLegendItems() {

        LegendItemCollection result = new LegendItemCollection();
        if (this.dataset == null) {
            return result;
        }

        List keys = null;
        prefetchSectionPaints();
        if (this.dataExtractOrder == TableOrder.BY_ROW) {
            keys = this.dataset.getColumnKeys();
        }
        else if (this.dataExtractOrder == TableOrder.BY_COLUMN) {
            keys = this.dataset.getRowKeys();
        }

        if (keys != null) {
            int section = 0;
            Iterator iterator = keys.iterator();
            while (iterator.hasNext()) {
                Comparable key = (Comparable) iterator.next();
                String label = key.toString();  // TODO: use a generator here
                String description = label;
                Paint paint = (Paint) this.sectionPaints.get(key);
                LegendItem item = new LegendItem(label, description, null,
                        null, getLegendItemShape(), paint,
                        Plot.DEFAULT_OUTLINE_STROKE, paint);
                item.setDataset(getDataset());
                result.add(item);
                section++;
            }
        }
        if (this.limit > 0.0) {
            result.add(new LegendItem(this.aggregatedItemsKey.toString(),
                    this.aggregatedItemsKey.toString(), null, null,
                    getLegendItemShape(), this.aggregatedItemsPaint,
                    Plot.DEFAULT_OUTLINE_STROKE, this.aggregatedItemsPaint));
        }
        return result;
    }

    /**
     * Tests this plot for equality with an arbitrary object.  Note that the
     * plot's dataset is not considered in the equality test.
     *
     * @param obj  the object (<code>null</code> permitted).
     *
     * @return <code>true</code> if this plot is equal to <code>obj</code>, and
     *     <code>false</code> otherwise.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof MultiplePiePlot)) {
            return false;
        }
        MultiplePiePlot that = (MultiplePiePlot) obj;
        if (this.dataExtractOrder != that.dataExtractOrder) {
            return false;
        }
        if (this.limit != that.limit) {
            return false;
        }
        if (!this.aggregatedItemsKey.equals(that.aggregatedItemsKey)) {
            return false;
        }
        if (!PaintUtilities.equal(this.aggregatedItemsPaint,
                that.aggregatedItemsPaint)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.pieChart, that.pieChart)) {
            return false;
        }
        if (!ShapeUtilities.equal(this.legendItemShape, that.legendItemShape)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a clone of the plot.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if some component of the plot does
     *         not support cloning.
     */
    public Object clone() throws CloneNotSupportedException {
        MultiplePiePlot clone = (MultiplePiePlot) super.clone();
        clone.pieChart = (JFreeChart) this.pieChart.clone();
        clone.sectionPaints = new HashMap(this.sectionPaints);
        clone.legendItemShape = ShapeUtilities.clone(this.legendItemShape);
        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.aggregatedItemsPaint, stream);
        SerialUtilities.writeShape(this.legendItemShape, 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.aggregatedItemsPaint = SerialUtilities.readPaint(stream);
        this.legendItemShape = SerialUtilities.readShape(stream);
        this.sectionPaints = new HashMap();
    }


}