combineddomainxyplot.java

关于jfreechart的电子说明书,一种说明图型使用的介绍

        
        // work out the space required by the domain axis...
        AxisSpace fixed = getFixedDomainAxisSpace();
        if (fixed != null) {
            if (orientation == PlotOrientation.HORIZONTAL) {
                space.setLeft(fixed.getLeft());
                space.setRight(fixed.getRight());
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                space.setTop(fixed.getTop());
                space.setBottom(fixed.getBottom());                
            }
        }
        else {
            ValueAxis xAxis = getDomainAxis();
            RectangleEdge xEdge = Plot.resolveDomainAxisLocation(
                getDomainAxisLocation(), orientation
            );
            if (xAxis != null) {
                space = xAxis.reserveSpace(g2, this, plotArea, xEdge, space);
            }
        }
        
        Rectangle2D adjustedPlotArea = space.shrink(plotArea, null);
        
        // work out the maximum height or width of the non-shared axes...
        int n = this.subplots.size();
        this.subplotAreas = new Rectangle2D[n];
        double x = adjustedPlotArea.getX();
        double y = adjustedPlotArea.getY();
        double usableSize = 0.0;
        if (orientation == PlotOrientation.HORIZONTAL) {
            usableSize = adjustedPlotArea.getWidth() - this.gap * (n - 1);
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            usableSize = adjustedPlotArea.getHeight() - this.gap * (n - 1);
        }

        for (int i = 0; i < n; i++) {
            XYPlot plot = (XYPlot) this.subplots.get(i);

            // calculate sub-plot area
            if (orientation == PlotOrientation.HORIZONTAL) {
                double w = usableSize * plot.getWeight() / this.totalWeight;
                this.subplotAreas[i] = new Rectangle2D.Double(
                    x, y, w, adjustedPlotArea.getHeight()
                );
                x = x + w + this.gap;
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                double h = usableSize * plot.getWeight() / this.totalWeight;
                this.subplotAreas[i] = new Rectangle2D.Double(
                    x, y, adjustedPlotArea.getWidth(), h
                );
                y = y + h + this.gap;
            }

            AxisSpace subSpace = plot.calculateRangeAxisSpace(
                g2, this.subplotAreas[i], null
            );
            space.ensureAtLeast(subSpace);

        }

        return space;
    }
    
    /**
     * Draws the plot within the specified area on a graphics device.
     * 
     * @param g2  the graphics device.
     * @param area  the plot area (in Java2D space).
     * @param anchor  an anchor point in Java2D space (<code>null</code> 
     *                permitted).
     * @param parentState  the state from the parent plot, if there is one 
     *                     (<code>null</code> permitted).
     * @param info  collects chart drawing information (<code>null</code> 
     *              permitted).
     */
    public void draw(Graphics2D g2,
                     Rectangle2D area,
                     Point2D anchor,
                     PlotState parentState,
                     PlotRenderingInfo info) {
        
        // set up info collection...
        if (info != null) {
            info.setPlotArea(area);
        }

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

        AxisSpace space = calculateAxisSpace(g2, area);
        Rectangle2D dataArea = space.shrink(area, null);

        // set the width and height of non-shared axis of all sub-plots
        setFixedRangeAxisSpaceForSubplots(space);

        // draw the shared axis
        ValueAxis axis = getDomainAxis();
        RectangleEdge edge = getDomainAxisEdge();
        double cursor = RectangleEdge.coordinate(dataArea, edge);
        AxisState axisState = axis.draw(g2, cursor, area, dataArea, edge, info);
        if (parentState == null) {
            parentState = new PlotState();
        }
        parentState.getSharedAxisStates().put(axis, axisState);
        
        // draw all the subplots
        for (int i = 0; i < this.subplots.size(); i++) {
            XYPlot plot = (XYPlot) this.subplots.get(i);
            PlotRenderingInfo subplotInfo = null;
            if (info != null) {
                subplotInfo = new PlotRenderingInfo(info.getOwner());
                info.addSubplotInfo(subplotInfo);
            }
            plot.draw(
                g2, this.subplotAreas[i], anchor, parentState, subplotInfo
            );
        }

        if (info != null) {
            info.setDataArea(dataArea);
        }
        
    }

    /**
     * Returns a collection of legend items for the plot.
     *
     * @return The legend items.
     */
    public LegendItemCollection getLegendItems() {        
        LegendItemCollection result = getFixedLegendItems();
        if (result == null) {
            result = new LegendItemCollection();
            if (this.subplots != null) {
                Iterator iterator = this.subplots.iterator();
                while (iterator.hasNext()) {
                    XYPlot plot = (XYPlot) iterator.next();
                    LegendItemCollection more = plot.getLegendItems();
                    result.addAll(more);
                }
            }
        }
        return result;
    }

    /**
     * Multiplies the range on the range axis/axes by the specified factor.
     *
     * @param factor  the zoom factor.
     * @param info  the plot rendering info.
     * @param source  the source point.
     */
    public void zoomRangeAxes(double factor, PlotRenderingInfo info, 
                              Point2D source) {
        XYPlot subplot = findSubplot(info, source);
        if (subplot != null) {
            subplot.zoomRangeAxes(factor, info, source);
        }
    }

    /**
     * Zooms in on the range axes.
     *
     * @param lowerPercent  the lower bound.
     * @param upperPercent  the upper bound.
     * @param info  the plot rendering info.
     * @param source  the source point.
     */
    public void zoomRangeAxes(double lowerPercent, double upperPercent, 
                              PlotRenderingInfo info, Point2D source) {
        XYPlot subplot = findSubplot(info, source);
        if (subplot != null) {
            subplot.zoomRangeAxes(lowerPercent, upperPercent, info, source);
        }
    }

    /**
     * Returns the subplot (if any) that contains the (x, y) point (specified 
     * in Java2D space).
     * 
     * @param info  the chart rendering info.
     * @param source  the source point.
     * 
     * @return A subplot (possibly <code>null</code>).
     */
    public XYPlot findSubplot(PlotRenderingInfo info, Point2D source) {
        XYPlot result = null;
        int subplotIndex = info.getSubplotIndex(source);
        if (subplotIndex >= 0) {
            result =  (XYPlot) this.subplots.get(subplotIndex);
        }
        return result;
    }
    
    /**
     * Sets the item renderer FOR ALL SUBPLOTS.  Registered listeners are 
     * notified that the plot has been modified.
     * <P>
     * Note: usually you will want to set the renderer independently for each 
     * subplot, which is NOT what this method does.
     *
     * @param renderer the new renderer.
     */
    public void setRenderer(XYItemRenderer renderer) {

        super.setRenderer(renderer);  // not strictly necessary, since the 
                                      // renderer set for the
                                      // parent plot is not used

        Iterator iterator = this.subplots.iterator();
        while (iterator.hasNext()) {
            XYPlot plot = (XYPlot) iterator.next();
            plot.setRenderer(renderer);
        }

    }

    /**
     * Sets the size (width or height, depending on the orientation of the 
     * plot) for the domain axis of each subplot.
     *
     * @param space  the space.
     */
    protected void setFixedRangeAxisSpaceForSubplots(AxisSpace space) {

        Iterator iterator = this.subplots.iterator();
        while (iterator.hasNext()) {
            XYPlot plot = (XYPlot) iterator.next();
            plot.setFixedRangeAxisSpace(space);
        }

    }

    /**
     * Handles a 'click' on the plot by updating the anchor values.
     *
     * @param x  x-coordinate, where the click occured.
     * @param y  y-coordinate, where the click occured.
     * @param info  object containing information about the plot dimensions.
     */
    public void handleClick(int x, int y, PlotRenderingInfo info) {
        Rectangle2D dataArea = info.getDataArea();
        if (dataArea.contains(x, y)) {
            for (int i = 0; i < this.subplots.size(); i++) {
                XYPlot subplot = (XYPlot) this.subplots.get(i);
                PlotRenderingInfo subplotInfo = info.getSubplotInfo(i);
                subplot.handleClick(x, y, subplotInfo);
            }
        }
    }
    
    /**
     * Receives a {@link PlotChangeEvent} and responds by notifying all 
     * listeners.
     * 
     * @param event  the event.
     */
    public void plotChanged(PlotChangeEvent event) {
        notifyListeners(event);
    }

    /**
     * Tests this plot for equality with another object.
     *
     * @param obj  the other 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 CombinedDomainXYPlot)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }

        CombinedDomainXYPlot p = (CombinedDomainXYPlot) obj;
        if (this.totalWeight != p.totalWeight) {
            return false;
        }
        if (this.gap != p.gap) {
            return false;
        }
        if (!ObjectUtilities.equal(this.subplots, p.subplots)) {
            return false;
        }

        return true;
    }
    
    /**
     * Returns a clone of the annotation.
     * 
     * @return A clone.
     * 
     * @throws CloneNotSupportedException  this class will not throw this 
     *         exception, but subclasses (if any) might.
     */
    public Object clone() throws CloneNotSupportedException {
        
        CombinedDomainXYPlot result = (CombinedDomainXYPlot) super.clone(); 
        result.subplots = (List) ObjectUtilities.deepClone(this.subplots);
        for (Iterator it = result.subplots.iterator(); it.hasNext();) {
            Plot child = (Plot) it.next();
            child.setParent(result);
        }
        
        // after setting up all the subplots, the shared domain axis may need 
        // reconfiguring
        ValueAxis domainAxis = result.getDomainAxis();
        if (domainAxis != null) {
            domainAxis.configure();
        }
        
        return result;
        
    }
    
}