abstractxyitemrenderer.java

jfreechart1.0.1 jsp绘制图表的开发包

                                   ValueAxis axis,
                                   Rectangle2D dataArea,
                                   double start, double end) {

        double x1 = axis.valueToJava2D(
            start, dataArea, plot.getDomainAxisEdge()
        );
        double x2 = axis.valueToJava2D(
            end, dataArea, plot.getDomainAxisEdge()
        );
        // TODO: need to change the next line to take account of plot 
        //       orientation...
        Rectangle2D band = new Rectangle2D.Double(
            x1, dataArea.getMinY(), 
            x2 - x1, dataArea.getMaxY() - dataArea.getMinY()
        );
        Paint paint = plot.getDomainTickBandPaint();

        if (paint != null) {
            g2.setPaint(paint);
            g2.fill(band);
        }

    }

    /**
     * Fills a band between two values on the range axis.  This can be used to 
     * color bands between the grid lines.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param axis  the range axis.
     * @param dataArea  the data area.
     * @param start  the start value.
     * @param end  the end value.
     */
    public void fillRangeGridBand(Graphics2D g2,
                                  XYPlot plot,
                                  ValueAxis axis,
                                  Rectangle2D dataArea,
                                  double start, double end) {

        double y1 = axis.valueToJava2D(
            start, dataArea, plot.getRangeAxisEdge()
        );
        double y2 = axis.valueToJava2D(end, dataArea, plot.getRangeAxisEdge());
        // TODO: need to change the next line to take account of the plot 
        //       orientation
        Rectangle2D band = new Rectangle2D.Double(
            dataArea.getMinX(), y2, dataArea.getWidth(), y1 - y2
        );
        Paint paint = plot.getRangeTickBandPaint();

        if (paint != null) {
            g2.setPaint(paint);
            g2.fill(band);
        }

    }

    /**
     * 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.
     */
    public void drawDomainGridLine(Graphics2D g2,
                                   XYPlot 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.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()
            );
        }

        Paint paint = plot.getDomainGridlinePaint();
        Stroke stroke = plot.getDomainGridlineStroke();
        g2.setPaint(paint != null ? paint : Plot.DEFAULT_OUTLINE_PAINT);
        g2.setStroke(stroke != null ? stroke : Plot.DEFAULT_OUTLINE_STROKE);
        g2.draw(line);

    }

    /**
     * Draws a line perpendicular to 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.
     * @param paint  the paint.
     * @param stroke  the stroke.
     */
    public void drawRangeLine(Graphics2D g2,
                              XYPlot plot,
                              ValueAxis axis,
                              Rectangle2D dataArea,
                              double value,
                              Paint paint,
                              Stroke stroke) {

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

        PlotOrientation orientation = plot.getOrientation();
        Line2D line = null;
        double v = axis.valueToJava2D(value, dataArea, plot.getRangeAxisEdge());
        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(paint);
        g2.setStroke(stroke);
        g2.draw(line);

    }

    /**
     * Draws a vertical line on the chart to represent a 'range marker'.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param domainAxis  the domain axis.
     * @param marker  the marker line.
     * @param dataArea  the axis data area.
     */
    public void drawDomainMarker(Graphics2D g2,
                                 XYPlot plot,
                                 ValueAxis domainAxis,
                                 Marker marker,
                                 Rectangle2D dataArea) {

        if (marker instanceof ValueMarker) {
            ValueMarker vm = (ValueMarker) marker;
            double value = vm.getValue();
            Range range = domainAxis.getRange();
            if (!range.contains(value)) {
                return;
            }

            double v = domainAxis.valueToJava2D(
                value, dataArea, plot.getDomainAxisEdge()
            );

            PlotOrientation orientation = plot.getOrientation();
            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);

            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, line.getBounds2D(), 
                    marker.getLabelOffset(), 
                    LengthAdjustmentType.EXPAND, anchor
                );
                TextUtilities.drawAlignedString(
                    label, g2, 
                    (float) coordinates.getX(), (float) coordinates.getY(), 
                    marker.getLabelTextAnchor()
                );
            }
        }
        else if (marker instanceof IntervalMarker) {
            IntervalMarker im = (IntervalMarker) marker;
            double start = im.getStartValue();
            double end = im.getEndValue();
            Range range = domainAxis.getRange();
            if (!(range.intersects(start, end))) {
                return;
            }

            // don't draw beyond the axis range...
            start = range.constrain(start);
            end = range.constrain(end);

            double v0 = domainAxis.valueToJava2D(
                start, dataArea, plot.getDomainAxisEdge()
            );
            double v1 = domainAxis.valueToJava2D(
                end, dataArea, plot.getDomainAxisEdge()
            );

            PlotOrientation orientation = plot.getOrientation();
            Rectangle2D rect = null;
            if (orientation == PlotOrientation.HORIZONTAL) {
                rect = new Rectangle2D.Double(
                    dataArea.getMinX(), Math.min(v0, v1), 
                    dataArea.getWidth(), Math.abs(v1 - v0)
                );
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                rect = new Rectangle2D.Double(
                    Math.min(v0, v1), dataArea.getMinY(), 
                    Math.abs(v1 - v0), dataArea.getHeight()
                );
            }

            Paint p = marker.getPaint();
            if (p instanceof GradientPaint) {
                GradientPaint gp = (GradientPaint) p;
                GradientPaintTransformer t = im.getGradientPaintTransformer();
                if (t != null) {
                    gp = t.transform(gp, rect);  
                }
                g2.setPaint(gp);
            }
            else {
                g2.setPaint(p);
            }
            g2.fill(rect);

            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, rect, marker.getLabelOffset(), 
                    marker.getLabelOffsetType(), anchor
                );
                TextUtilities.drawAlignedString(
                    label, g2, (float) coordinates.getX(), 
                    (float) coordinates.getY(), 
                    marker.getLabelTextAnchor()
                );
            }

        }

    }

    /**
     * Calculates the (x, y) coordinates for drawing a marker label.
     *
     * @param g2  the graphics device.
     * @param orientation  the plot orientation.
     * @param dataArea  the data area.
     * @param markerArea  the rectangle surrounding the marker area.
     * @param markerOffset  the marker label offset.
     * @param labelOffsetType  the label offset type.
     * @param anchor  the label anchor.
     *
     * @return The coordinates for drawing the marker label.
     */
    protected Point2D calculateDomainMarkerTextAnchorPoint(Graphics2D g2,
            PlotOrientation orientation,
            Rectangle2D dataArea,
            Rectangle2D markerArea,
            RectangleInsets markerOffset,
            LengthAdjustmentType labelOffsetType,
            RectangleAnchor anchor) {

        Rectangle2D anchorRect = null;
        if (orientation == PlotOrientation.HORIZONTAL) {
            anchorRect = markerOffset.createAdjustedRectangle(
                markerArea, LengthAdjustmentType.CONTRACT, labelOffsetType
            );
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            anchorRect = markerOffset.createAdjustedRectangle(
                markerArea, labelOffsetType, LengthAdjustmentType.CONTRACT
            );
        }
        return RectangleAnchor.coordinates(anchorRect, anchor);

    }

    /**
     * Draws a horizontal line across the chart to represent a 'range marker'.
     *
     * @param g2  the graphics device.
     * @param plot  the plot.
     * @param rangeAxis  the range axis.
     * @param marker  the marker line.
     * @param dataArea  the axis data area.
     */
    public void drawRangeMarker(Graphics2D g2,
                                XYPlot plot,
                                ValueAxis rangeAxis,
                                Marker marker,
                                Rectangle2D dataArea) {

        if (marker instanceof ValueMarker) {
            ValueMarker vm = (ValueMarker) marker;
            double value = vm.getValue();
            Range range = rangeAxis.getRange();
            if (!range.contains(value)) {
                return;
            }

            double v = rangeAxis.valueToJava2D(
                value, dataArea, plot.getRangeAxisEdge()
            );
            PlotOrientation orientation = plot.getOrientation();
            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();