abstractcategoryitemrenderer.java

jfreechart-1.0.12.zip 可以用来作图

    public Range findRangeBounds(CategoryDataset dataset) {
        if (dataset == null) {
            return null;
        }
        return DatasetUtilities.findRangeBounds(dataset);
    }

    /**
     * Returns the Java2D coordinate for the middle of the specified data item.
     *
     * @param rowKey  the row key.
     * @param columnKey  the column key.
     * @param dataset  the dataset.
     * @param axis  the axis.
     * @param area  the data area.
     * @param edge  the edge along which the axis lies.
     *
     * @return The Java2D coordinate for the middle of the item.
     *
     * @since 1.0.11
     */
    public double getItemMiddle(Comparable rowKey, Comparable columnKey,
            CategoryDataset dataset, CategoryAxis axis, Rectangle2D area,
            RectangleEdge edge) {
        return axis.getCategoryMiddle(columnKey, dataset.getColumnKeys(), area,
                edge);
    }

    /**
     * Draws a background for the data area.  The default implementation just
     * gets the plot to draw the background, but some renderers will override
     * this behaviour.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param dataArea  the data area.
     */
    public void drawBackground(Graphics2D g2,
                               CategoryPlot plot,
                               Rectangle2D dataArea) {

        plot.drawBackground(g2, dataArea);

    }

    /**
     * Draws an outline for the data area.  The default implementation just
     * gets the plot to draw the outline, but some renderers will override this
     * behaviour.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param dataArea  the data area.
     */
    public void drawOutline(Graphics2D g2,
                            CategoryPlot plot,
                            Rectangle2D dataArea) {

        plot.drawOutline(g2, dataArea);

    }

    /**
     * Draws a grid line against the domain axis.
     * <P>
     * Note that this default implementation assumes that the horizontal axis
     * is the domain axis. If this is not the case, you will need to override
     * this method.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param dataArea  the area for plotting data (not yet adjusted for any
     *                  3D effect).
     * @param value  the Java2D value at which the grid line should be drawn.
     *
     * @see #drawRangeGridline(Graphics2D, CategoryPlot, ValueAxis,
     *     Rectangle2D, double)
     */
    public void drawDomainGridline(Graphics2D g2,
                                   CategoryPlot plot,
                                   Rectangle2D dataArea,
                                   double value) {

        Line2D line = null;
        PlotOrientation orientation = plot.getOrientation();

        if (orientation == PlotOrientation.HORIZONTAL) {
            line = new Line2D.Double(dataArea.getMinX(), value,
                    dataArea.getMaxX(), value);
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            line = new Line2D.Double(value, dataArea.getMinY(), value,
                    dataArea.getMaxY());
        }

        Paint paint = plot.getDomainGridlinePaint();
        if (paint == null) {
            paint = CategoryPlot.DEFAULT_GRIDLINE_PAINT;
        }
        g2.setPaint(paint);

        Stroke stroke = plot.getDomainGridlineStroke();
        if (stroke == null) {
            stroke = CategoryPlot.DEFAULT_GRIDLINE_STROKE;
        }
        g2.setStroke(stroke);

        g2.draw(line);

    }

    /**
     * Draws a grid line against the range axis.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param axis  the value axis.
     * @param dataArea  the area for plotting data (not yet adjusted for any
     *                  3D effect).
     * @param value  the value at which the grid line should be drawn.
     *
     * @see #drawDomainGridline(Graphics2D, CategoryPlot, Rectangle2D, double)
     *
     */
    public void drawRangeGridline(Graphics2D g2,
                                  CategoryPlot plot,
                                  ValueAxis axis,
                                  Rectangle2D dataArea,
                                  double value) {

        Range range = axis.getRange();
        if (!range.contains(value)) {
            return;
        }

        PlotOrientation orientation = plot.getOrientation();
        double v = axis.valueToJava2D(value, dataArea, plot.getRangeAxisEdge());
        Line2D line = null;
        if (orientation == PlotOrientation.HORIZONTAL) {
            line = new Line2D.Double(v, dataArea.getMinY(), v,
                    dataArea.getMaxY());
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            line = new Line2D.Double(dataArea.getMinX(), v,
                    dataArea.getMaxX(), v);
        }

        Paint paint = plot.getRangeGridlinePaint();
        if (paint == null) {
            paint = CategoryPlot.DEFAULT_GRIDLINE_PAINT;
        }
        g2.setPaint(paint);

        Stroke stroke = plot.getRangeGridlineStroke();
        if (stroke == null) {
            stroke = CategoryPlot.DEFAULT_GRIDLINE_STROKE;
        }
        g2.setStroke(stroke);

        g2.draw(line);

    }

    /**
     * Draws a marker for the domain axis.
     *
     * @param g2  the graphics device (not <code>null</code>).
     * @param plot  the plot (not <code>null</code>).
     * @param axis  the range axis (not <code>null</code>).
     * @param marker  the marker to be drawn (not <code>null</code>).
     * @param dataArea  the area inside the axes (not <code>null</code>).
     *
     * @see #drawRangeMarker(Graphics2D, CategoryPlot, ValueAxis, Marker,
     *     Rectangle2D)
     */
    public void drawDomainMarker(Graphics2D g2,
                                 CategoryPlot plot,
                                 CategoryAxis axis,
                                 CategoryMarker marker,
                                 Rectangle2D dataArea) {

        Comparable category = marker.getKey();
        CategoryDataset dataset = plot.getDataset(plot.getIndexOf(this));
        int columnIndex = dataset.getColumnIndex(category);
        if (columnIndex < 0) {
            return;
        }

        final Composite savedComposite = g2.getComposite();
        g2.setComposite(AlphaComposite.getInstance(
                AlphaComposite.SRC_OVER, marker.getAlpha()));

        PlotOrientation orientation = plot.getOrientation();
        Rectangle2D bounds = null;
        if (marker.getDrawAsLine()) {
            double v = axis.getCategoryMiddle(columnIndex,
                    dataset.getColumnCount(), dataArea,
                    plot.getDomainAxisEdge());
            Line2D line = null;
            if (orientation == PlotOrientation.HORIZONTAL) {
                line = new Line2D.Double(dataArea.getMinX(), v,
                        dataArea.getMaxX(), v);
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                line = new Line2D.Double(v, dataArea.getMinY(), v,
                        dataArea.getMaxY());
            }
            g2.setPaint(marker.getPaint());
            g2.setStroke(marker.getStroke());
            g2.draw(line);
            bounds = line.getBounds2D();
        }
        else {
            double v0 = axis.getCategoryStart(columnIndex,
                    dataset.getColumnCount(), dataArea,
                    plot.getDomainAxisEdge());
            double v1 = axis.getCategoryEnd(columnIndex,
                    dataset.getColumnCount(), dataArea,
                    plot.getDomainAxisEdge());
            Rectangle2D area = null;
            if (orientation == PlotOrientation.HORIZONTAL) {
                area = new Rectangle2D.Double(dataArea.getMinX(), v0,
                        dataArea.getWidth(), (v1 - v0));
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                area = new Rectangle2D.Double(v0, dataArea.getMinY(),
                        (v1 - v0), dataArea.getHeight());
            }
            g2.setPaint(marker.getPaint());
            g2.fill(area);
            bounds = area;
        }

        String label = marker.getLabel();
        RectangleAnchor anchor = marker.getLabelAnchor();
        if (label != null) {
            Font labelFont = marker.getLabelFont();
            g2.setFont(labelFont);
            g2.setPaint(marker.getLabelPaint());
            Point2D coordinates = calculateDomainMarkerTextAnchorPoint(
                    g2, orientation, dataArea, bounds, marker.getLabelOffset(),
                    marker.getLabelOffsetType(), anchor);
            TextUtilities.drawAlignedString(label, g2,
                    (float) coordinates.getX(), (float) coordinates.getY(),
                    marker.getLabelTextAnchor());
        }
        g2.setComposite(savedComposite);
    }

    /**
     * Draws a marker for the range axis.
     *
     * @param g2  the graphics device (not <code>null</code>).
     * @param plot  the plot (not <code>null</code>).
     * @param axis  the range axis (not <code>null</code>).
     * @param marker  the marker to be drawn (not <code>null</code>).
     * @param dataArea  the area inside the axes (not <code>null</code>).
     *
     * @see #drawDomainMarker(Graphics2D, CategoryPlot, CategoryAxis,
     *     CategoryMarker, Rectangle2D)
     */
    public void drawRangeMarker(Graphics2D g2,
                                CategoryPlot plot,
                                ValueAxis axis,
                                Marker marker,
                                Rectangle2D dataArea) {

        if (marker instanceof ValueMarker) {
            ValueMarker vm = (ValueMarker) marker;
            double value = vm.getValue();
            Range range = axis.getRange();

            if (!range.contains(value)) {
                return;
            }

            final Composite savedComposite = g2.getComposite();
            g2.setComposite(AlphaComposite.getInstance(
                    AlphaComposite.SRC_OVER, marker.getAlpha()));

            PlotOrientation orientation = plot.getOrientation();
            double v = axis.valueToJava2D(value, dataArea,
                    plot.getRangeAxisEdge());
            Line2D line = null;
            if (orientation == PlotOrientation.HORIZONTAL) {
                line = new Line2D.Double(v, dataArea.getMinY(), v,
                        dataArea.getMaxY());
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                line = new Line2D.Double(dataArea.getMinX(), v,
                        dataArea.getMaxX(), v);
            }

            g2.setPaint(marker.getPaint());
            g2.setStroke(marker.getStroke());
            g2.draw(line);

            String label = marker.getLabel();
            RectangleAnchor anchor = marker.getLabelAnchor();
            if (label != null) {
                Font labelFont = marker.getLabelFont();
                g2.setFont(labelFont);
                g2.setPaint(marker.getLabelPaint());
                Point2D coordinates = calculateRangeMarkerTextAnchorPoint(
                        g2, orientation, dataArea, line.getBounds2D(),
                        marker.getLabelOffset(), LengthAdjustmentType.EXPAND,
                        anchor);
                TextUtilities.drawAlignedString(label, g2,
                        (float) coordinates.getX(), (float) coordinates.getY(),
                        marker.getLabelTextAnchor());
            }
            g2.setComposite(savedComposite);
        }
        else if (marker instanceof IntervalMarker) {
            IntervalMarker im = (IntervalMarker) marker;
            double start = im.getStartValue();
            double end = im.getEndValue();
            Range range = axis.getRange();
            if (!(range.intersects(start, end))) {
                return;
            }

            final Composite savedComposite = g2.getComposite();
            g2.setComposite(AlphaComposite.getInstance(
                    AlphaComposite.SRC_OVER, marker.getAlpha()));

            double start2d = axis.valueToJava2D(start, dataArea,
                    plot.getRangeAxisEdge());
            double end2d = axis.valueToJava2D(end, dataArea,
                    plot.getRangeAxisEdge());
            double low = Math.min(start2d, end2d);
            double high = Math.max(start2d, end2d);

            PlotOrientation orientation = plot.getOrientation();
            Rectangle2D rect = null;
            if (orientation == PlotOrientation.HORIZONTAL) {
                // clip left and right bounds to data area