abstractxyitemrenderer.java

jfreechart1.0.1 jsp绘制图表的开发包

            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()
                );
            }
        }
        else if (marker instanceof IntervalMarker) {
            
            IntervalMarker im = (IntervalMarker) marker;
            double start = im.getStartValue();
            double end = im.getEndValue();
            Range range = rangeAxis.getRange();
            if (!(range.intersects(start, end))) {
                return;
            }

            // don't draw beyond the axis range...
            start = range.constrain(start);
            end = range.constrain(end);
            
            double v0 = rangeAxis.valueToJava2D(
                start, dataArea, plot.getRangeAxisEdge()
            );
            double v1 = rangeAxis.valueToJava2D(
                end, dataArea, plot.getRangeAxisEdge()
            );

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

            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 = calculateRangeMarkerTextAnchorPoint(
                    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 marker area.
     * @param markerOffset  the marker offset.
     * @param anchor  the label anchor.
     *
     * @return The coordinates for drawing the marker label.
     */
    private Point2D calculateRangeMarkerTextAnchorPoint(Graphics2D g2,
                                      PlotOrientation orientation,
                                      Rectangle2D dataArea,
                                      Rectangle2D markerArea,
                                      RectangleInsets markerOffset,
                                      LengthAdjustmentType labelOffsetForRange,
                                      RectangleAnchor anchor) {

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

    }

    /**
     * Returns a clone of the renderer.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException if the renderer does not support 
     *         cloning.
     */
    protected Object clone() throws CloneNotSupportedException {
        AbstractXYItemRenderer clone = (AbstractXYItemRenderer) super.clone();
        // 'plot' : just retain reference, not a deep copy
        if (this.itemLabelGenerator != null 
                && this.itemLabelGenerator instanceof PublicCloneable) {
            PublicCloneable pc = (PublicCloneable) this.itemLabelGenerator;
            clone.itemLabelGenerator = (XYItemLabelGenerator) pc.clone();
        }
        return clone;
    }

    /**
     * Tests this renderer for equality with another object.
     *
     * @param obj  the object.
     *
     * @return <code>true</code> or <code>false</code>.
     */
    public boolean equals(Object obj) {

        if (obj == null) {
            return false;
        }

        if (obj == this) {
            return true;
        }

        if (!(obj instanceof AbstractXYItemRenderer)) {
            return false;
        }

        AbstractXYItemRenderer renderer = (AbstractXYItemRenderer) obj;
        if (!super.equals(obj)) {
            return false;
        }
        if (!ObjectUtilities.equal(
            this.itemLabelGenerator, renderer.itemLabelGenerator
        )) {
            return false;
        }
        if (!ObjectUtilities.equal(this.urlGenerator, renderer.urlGenerator)) {
            return false;
        }
        return true;
    }

    /**
     * Returns the drawing supplier from the plot.
     *
     * @return The drawing supplier (possibly <code>null</code>).
     */
    public DrawingSupplier getDrawingSupplier() {
        DrawingSupplier result = null;
        XYPlot p = getPlot();
        if (p != null) {
            result = p.getDrawingSupplier();
        }
        return result;
    }

    /**
     * Considers the current (x, y) coordinate and updates the crosshair point 
     * if it meets the criteria (usually means the (x, y) coordinate is the 
     * closest to the anchor point so far).
     *
     * @param crosshairState  the crosshair state (<code>null</code> permitted, 
     *                        but the method does nothing in that case).
     * @param x  the x-value (in data space).
     * @param y  the y-value (in data space).
     * @param transX  the x-value translated to Java2D space.
     * @param transY  the y-value translated to Java2D space.
     * @param orientation  the plot orientation (<code>null</code> not 
     *                     permitted).
     */
    protected void updateCrosshairValues(CrosshairState crosshairState,
                                         double x, double y, double transX, 
                                         double transY,
                                         PlotOrientation orientation) {

        if (orientation == null) {
            throw new IllegalArgumentException("Null 'orientation' argument.");
        }

        if (crosshairState != null) {
            // do we need to update the crosshair values?
            if (this.plot.isDomainCrosshairLockedOnData()) {
                if (this.plot.isRangeCrosshairLockedOnData()) {
                    // both axes
                    crosshairState.updateCrosshairPoint(
                        x, y, transX, transY, orientation
                    );
                }
                else {
                    // just the domain axis...
                    crosshairState.updateCrosshairX(x);
                }
            }
            else {
                if (this.plot.isRangeCrosshairLockedOnData()) {
                    // just the range axis...
                    crosshairState.updateCrosshairY(y);
                }
            }
        }

    }
    
    /**
     * Draws an item label.
     *
     * @param g2  the graphics device.
     * @param orientation  the orientation.
     * @param dataset  the dataset.
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     * @param x  the x coordinate (in Java2D space).
     * @param y  the y coordinate (in Java2D space).
     * @param negative  indicates a negative value (which affects the item 
     *                  label position).
     */
    protected void drawItemLabel(Graphics2D g2, PlotOrientation orientation,
            XYDataset dataset, int series, int item, double x, double y, 
            boolean negative) {
                                     
        XYItemLabelGenerator generator = getItemLabelGenerator(series, item);
        if (generator != null) {
            Font labelFont = getItemLabelFont(series, item);
            Paint paint = getItemLabelPaint(series, item);
            g2.setFont(labelFont);
            g2.setPaint(paint);
            String label = generator.generateLabel(dataset, series, item);

            // get the label position..
            ItemLabelPosition position = null;
            if (!negative) {
                position = getPositiveItemLabelPosition(series, item);
            }
            else {
                position = getNegativeItemLabelPosition(series, item);
            }

            // work out the label anchor point...
            Point2D anchorPoint = calculateLabelAnchorPoint(
                position.getItemLabelAnchor(), x, y, orientation);
            TextUtilities.drawRotatedString(label, g2, 
                    (float) anchorPoint.getX(), (float) anchorPoint.getY(),
                    position.getTextAnchor(), position.getAngle(), 
                    position.getRotationAnchor());
        }

    }
    
    /**
     * Draws all the annotations for the specified layer.
     * 
     * @param g2  the graphics device.
     * @param dataArea  the data area.
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param layer  the layer.
     * @param info  the plot rendering info.
     */
    public void drawAnnotations(Graphics2D g2, 
                                Rectangle2D dataArea, 
                                ValueAxis domainAxis, 
                                ValueAxis rangeAxis, 
                                Layer layer, 
                                PlotRenderingInfo info) {
        
        Iterator iterator = null;
        if (layer.equals(Layer.FOREGROUND)) {
            iterator = this.foregroundAnnotations.iterator();
        }
        else if (layer.equals(Layer.BACKGROUND)) {
            iterator = this.backgroundAnnotations.iterator();
        }
        else {
            // should not get here
            throw new RuntimeException("Unknown layer.");
        }
        while (iterator.hasNext()) {
            XYAnnotation annotation = (XYAnnotation) iterator.next();
            annotation.draw(
                g2, this.plot, dataArea, domainAxis, rangeAxis, 0, info
            );
        }
        
    }

    /**
     * Adds an entity to the collection.
     * 
     * @param entities  the entity collection being populated.
     * @param area  the entity area (if <code>null</code> a default will be 
     *              used).
     * @param dataset  the dataset.
     * @param series  the series.
     * @param item  the item.
     * @param entityX  the entity's center x-coordinate in user space.
     * @param entityY  the entity's center y-coordinate in user space.
     */
    protected void addEntity(EntityCollection entities, Shape area, 
                             XYDataset dataset, int series, int item,
                             double entityX, double entityY) {
        if (!getItemCreateEntity(series, item)) {
            return;
        }
        if (area == null) {
            area = new Ellipse2D.Double(
                entityX - this.defaultEntityRadius, 
                entityY - this.defaultEntityRadius, 
                this.defaultEntityRadius * 2, this.defaultEntityRadius * 2
            );
        }
        String tip = null;
        XYToolTipGenerator generator = getToolTipGenerator(series, item);
        if (generator != null) {
            tip = generator.generateToolTip(dataset, series, item);
        }
        String url = null;
        if (getURLGenerator() != null) {
            url = getURLGenerator().generateURL(dataset, series, item);
        }
        XYItemEntity entity = new XYItemEntity(
            area, dataset, series, item, tip, url
        );
        entities.add(entity);
    }

}