*
     * @param section  the section index (zero-based).
     * @param paint  the paint (<code>null</code> permitted).
     */
    public void setSectionPaint(int section, Paint paint) {
        this.sectionPaintList.setPaint(section, paint);
        notifyListeners(new PlotChangeEvent(this));
    }
    
    /**
     * Returns the base section paint.  This is used when no other paint is 
     * available.
     * 
     * @return The paint (never <code>null</code>).
     */
    public Paint getBaseSectionPaint() {
        return this.baseSectionPaint;   
    }
    
    /**
     * Sets the base section paint.
     * 
     * @param paint  the paint (<code>null</code> not permitted).
     */
    public void setBaseSectionPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");   
        }
        this.baseSectionPaint = paint;
        notifyListeners(new PlotChangeEvent(this));
    }
    
    //// SECTION OUTLINE PAINT ////////////////////////////////////////////////

    /**
     * Returns the flag that controls whether or not the outline is drawn for
     * each pie section.
     * 
     * @return The flag that controls whether or not the outline is drawn for
     *         each pie section.
     */
    public boolean getSectionOutlinesVisible() {
        return this.sectionOutlinesVisible;
    }
    
    /**
     * Sets the flag that controls whether or not the outline is drawn for 
     * each pie section, and sends a {@link PlotChangeEvent} to all registered
     * listeners.
     * 
     * @param visible  the flag.
     */
    public void setSectionOutlinesVisible(boolean visible) {
        this.sectionOutlinesVisible = visible;
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Returns the outline paint for ALL sections in the plot.
     *
     * @return The paint (possibly <code>null</code>).
     */
    public Paint getSectionOutlinePaint() {
        return this.sectionOutlinePaint;
    }

    /**
     * Sets the outline paint for ALL sections in the plot.  If this is set to
     * </code>null</code>, then a list of paints is used instead (to allow
     * different colors to be used for each section).
     *
     * @param paint  the paint (<code>null</code> permitted).
     */
    public void setSectionOutlinePaint(Paint paint) {
        this.sectionOutlinePaint = paint;
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Returns the paint for the specified section.
     * 
     * @param section  the section index (zero-based).
     * 
     * @return The paint (never <code>null</code>).
     */
    public Paint getSectionOutlinePaint(int section) {
        
        // return the override, if there is one...
        if (this.sectionOutlinePaint != null) {
            return this.sectionOutlinePaint;
        }

        // otherwise look up the paint list
        Paint result = this.sectionOutlinePaintList.getPaint(section);
        if (result == null) {
            result = this.baseSectionOutlinePaint;
        }
        return result;
       
    }
    
    /**
     * Sets the paint used to fill a section of the pie and sends a 
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param section  the section index (zero-based).
     * @param paint  the paint (<code>null</code> permitted).
     */
    public void setSectionOutlinePaint(int section, Paint paint) {
        this.sectionOutlinePaintList.setPaint(section, paint);
        notifyListeners(new PlotChangeEvent(this));
    }
    
    /**
     * Returns the base section paint.  This is used when no other paint is 
     * available.
     * 
     * @return The paint (never <code>null</code>).
     */
    public Paint getBaseSectionOutlinePaint() {
        return this.baseSectionOutlinePaint;   
    }
    
    /**
     * Sets the base section paint.
     * 
     * @param paint  the paint (<code>null</code> not permitted).
     */
    public void setBaseSectionOutlinePaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");   
        }
        this.baseSectionOutlinePaint = paint;
        notifyListeners(new PlotChangeEvent(this));
    }
    
    //// SECTION OUTLINE STROKE ///////////////////////////////////////////////

    /**
     * Returns the outline stroke for ALL sections in the plot.
     *
     * @return The stroke (possibly <code>null</code>).
     */
    public Stroke getSectionOutlineStroke() {
        return this.sectionOutlineStroke;
    }

    /**
     * Sets the outline stroke for ALL sections in the plot.  If this is set to
     * </code>null</code>, then a list of paints is used instead (to allow
     * different colors to be used for each section).
     *
     * @param stroke  the stroke (<code>null</code> permitted).
     */
    public void setSectionOutlineStroke(Stroke stroke) {
        this.sectionOutlineStroke = stroke;
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Returns the stroke for the specified section.
     * 
     * @param section  the section index (zero-based).
     * 
     * @return The stroke (never <code>null</code>).
     */
    public Stroke getSectionOutlineStroke(int section) {
        
        // return the override, if there is one...
        if (this.sectionOutlineStroke != null) {
            return this.sectionOutlineStroke;
        }

        // otherwise look up the paint list
        Stroke result = this.sectionOutlineStrokeList.getStroke(section);
        if (result == null) {
            result = this.baseSectionOutlineStroke;
        }
        return result;
       
    }
    
    /**
     * Sets the stroke used to fill a section of the pie and sends a 
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param section  the section index (zero-based).
     * @param stroke  the stroke (<code>null</code> permitted).
     */
    public void setSectionOutlineStroke(int section, Stroke stroke) {
        this.sectionOutlineStrokeList.setStroke(section, stroke);
        notifyListeners(new PlotChangeEvent(this));
    }
    
    /**
     * Returns the base section stroke.  This is used when no other stroke is 
     * available.
     * 
     * @return The stroke (never <code>null</code>).
     */
    public Stroke getBaseSectionOutlineStroke() {
        return this.baseSectionOutlineStroke;   
    }
    
    /**
     * Sets the base section stroke.
     * 
     * @param stroke  the stroke (<code>null</code> not permitted).
     */
    public void setBaseSectionOutlineStroke(Stroke stroke) {
        if (stroke == null) {
            throw new IllegalArgumentException("Null 'stroke' argument.");   
        }
        this.baseSectionOutlineStroke = stroke;
        notifyListeners(new PlotChangeEvent(this));
    }

    /**
     * Returns the shadow paint.
     * 
     * @return The paint (possibly <code>null</code>).
     */
    public Paint getShadowPaint() {
        return this.shadowPaint;   
    }
    
    /**
     * Sets the shadow paint and sends a {@link PlotChangeEvent} to all 
     * registered listeners.
     * 
     * @param paint  the paint (<code>null</code> permitted).
     */
    public void setShadowPaint(Paint paint) {
        this.shadowPaint = paint;
        notifyListeners(new PlotChangeEvent(this));
    }
    
    /**
     * Returns the x-offset for the shadow effect.
     * 
     * @return The offset (in Java2D units).
     */
    public double getShadowXOffset() {
        return this.shadowXOffset;
    }
    
    /**
     * Sets the x-offset for the shadow effect and sends a 
     * {@link PlotChangeEvent} to all registered listeners.
     * 
     * @param offset  the offset (in Java2D units).
     */
    public void setShadowXOffset(double offset) {
        this.shadowXOffset = offset;   
        notifyListeners(new PlotChangeEvent(this));
    }
    
    /**
     * Returns the y-offset for the shadow effect.
     * 
     * @return The offset (in Java2D units).
     */
    public double getShadowYOffset() {
        return this.shadowYOffset;
    }
    
    /**
     * Sets the y-offset for the shadow effect and sends a 
     * {@link PlotChangeEvent} to all registered listeners.
     * 
     * @param offset  the offset (in Java2D units).
     */
    public void setShadowYOffset(double offset) {
        this.shadowYOffset = offset;   
        notifyListeners(new PlotChangeEvent(this));
    }
    
    /**
     * Returns the amount that a section should be 'exploded'.
     *
     * @param section  the section number.
     *
     * @return The amount that a section should be 'exploded'.
     */
    public double getExplodePercent(int section) {
        double result = 0.0;
        if (this.explodePercentages != null) {
            Number percent = (Number) this.explodePercentages.get(section);
            if (percent != null) {
                result = percent.doubleValue();
            }
        }
        return result;
    }

    /**
     * Sets the amount that a pie section should be exploded and sends a 
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param section  the section index.
     * @param percent  the explode percentage (0.30 = 30 percent).
     */
    public void setExplodePercent(int section, double percent) {
        if (this.explodePercentages == null) {
            this.explodePercentages = new ObjectList();
        }
        this.explodePercentages.set(section, new Double(percent));
        notifyListeners(new PlotChangeEvent(this));
    }
    
    /**
     * Returns the maximum explode percent.
     * 
     * @return The percent.
     */
    public double getMaximumExplodePercent() {
        double result = 0.0;
        for (int i = 0; i < this.explodePercentages.size(); i++) {
            Number explode = (Number) this.explodePercentages.get(i);
            if (explode != null) {
                result = Math.max(result, explode.doubleValue());   
            }
        }
        return result;
    }
    
    /**
     * Returns the section label generator. 
     * 
     * @return The generator (possibly <code>null</code>).
     */
    public PieSectionLabelGenerator getLabelGenerator() {
        return this.labelGenerator;   
    }
    
    /**
     * Sets the section label generator and sends a {@link PlotChangeEvent} to
     * all registered listeners.
     * 
     * @param generator  the generator (<code>null</code> permitted).
     */
    public void setLabelGenerator(PieSectionLabelGenerator generator) {
        this.labelGenerator = generator;
        notifyListeners(new PlotChangeEvent(this));
    }
    
    /**
     * Returns the gap between the edge of the pie and the labels, expressed as 
     * a percentage of the plot width.
     * 
     * @return The gap (a percentage, where 0.05 = five percent).
     */
    public double getLabelGap() {
        return this.labelGap;   
    }
    
    /**
     * Sets the gap between the edge of the pie and the labels (expressed as a 
     * percentage of the plot width) and sends a {@link PlotChangeEvent} to all
     * registered listeners.
     * 
     * @param gap  the gap (a percentage, where 0.05 = five percent).
     */
    public void setLabelGap(double gap) {
        this.labelGap = gap;   
        notifyListeners(new PlotChangeEvent(this));
    }