combineddomainxyplot.java

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        subplots.remove(subplot);
        subplot.setParent(null);
        this.totalWeight -= subplot.getWeight();

        ValueAxis domain = getDomainAxis();
        if (domain != null) {
            domain.configure();
        }

        notifyListeners(new PlotChangeEvent(this));

    }

    /**
     * Returns the list of subplots.
     *
     * @return An unmodifiable list of subplots.
     */
    public List getSubplots() {
        return Collections.unmodifiableList(this.subplots);
    }

    /**
     * Calculates the axis space required.
     * 
     * @param g2  the graphics device.
     * @param plotArea  the plot area.
     * 
     * @return The space.
     */
    protected AxisSpace calculateAxisSpace(Graphics2D g2, Rectangle2D plotArea) {
        
        AxisSpace space = new AxisSpace();
        PlotOrientation orientation = getOrientation();
        
        // 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 = 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() - gap * (n - 1);
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            usableSize = adjustedPlotArea.getHeight() - gap * (n - 1);
        }

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

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

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

        }

        return space;
    }

    /**
     * Draws the plot on a Java 2D graphics device (such as the screen or a printer).
     * Will perform all the placement calculations for each sub-plots and then tell these to draw
     * themselves.
     *
     * @param g2  the graphics device.
     * @param plotArea  the area within which the plot (including axis labels) should be drawn.
     * @param info  collects information about the drawing (null permitted).
     */
    public void draw(Graphics2D g2, Rectangle2D plotArea, ChartRenderingInfo info) {

        // set up info collection...
        if (info != null) {
            info.setPlotArea(plotArea);
        }

        // adjust the drawing area for plot insets (if any)...
        Insets insets = getInsets();
        if (insets != null) {
            plotArea.setRect(plotArea.getX() + insets.left,
                             plotArea.getY() + insets.top,
                             plotArea.getWidth() - insets.left - insets.right,
                             plotArea.getHeight() - insets.top - insets.bottom);
        }

        PlotOrientation orientation = getOrientation();

        AxisSpace space = calculateAxisSpace(g2, plotArea);
        Rectangle2D dataArea = space.shrink(plotArea, null);
        //this.axisOffset.trim(dataArea);

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

        // draw all the charts
        for (int i = 0; i < this.subplots.size(); i++) {
            XYPlot plot = (XYPlot) subplots.get(i);
            plot.draw(g2, this.subplotAreas[i], info);
        }

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

        // draw the shared axis
        ValueAxis axis = getDomainAxis();
        RectangleEdge edge = getDomainAxisEdge();
        double cursor = RectangleEdge.coordinate(dataArea, edge);
        axis.draw(g2, cursor, plotArea, dataArea, edge);
        
    }

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

        LegendItemCollection result = new LegendItemCollection();

        if (subplots != null) {
            Iterator iterator = subplots.iterator();
            while (iterator.hasNext()) {
                XYPlot plot = (XYPlot) iterator.next();
                LegendItemCollection more = plot.getLegendItems();
                result.addAll(more);
            }
        }

        return result;

    }

    /**
     * A zoom method that (currently) does nothing.
     *
     * @param percent  the zoom percentage.
     */
    public void zoom(double percent) {
        // need to decide how to handle zooming...
    }

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

    }

    /**
     * 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) {
            CombinedDomainXYPlot p = (CombinedDomainXYPlot) obj;
            if (super.equals(obj)) {
                boolean b0 = true;
                boolean b1 = true;
                // ObjectUtils.equalOrBothNull(this.subplots, p.subplots);
                boolean b2 = (this.totalWeight == p.totalWeight);
                boolean b3 = (this.gap == p.gap);
                return b0 && b1 && b2 && b3;
            }
        }

        return false;
    }
    
    /**
     * 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 = subplots.iterator();
        while (iterator.hasNext()) {
            XYPlot plot = (XYPlot) iterator.next();
            plot.setFixedRangeAxisSpace(space);
        }

    }

}