valueaxis.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 1,561 行 · 第 1/4 页

     *
     * @param ticks  the ticks.
     * @param g2  the graphics device.
     * @param drawArea  the area within which the plot and axes should be drawn.
     * @param vertical  a flag that indicates whether or not the tick labels 
     *                  are 'vertical'.
     *
     * @return The height of the tallest tick label.
     */
    protected double findMaximumTickLabelHeight(List ticks,
                                                Graphics2D g2, 
                                                Rectangle2D drawArea, 
                                                boolean vertical) {
                                                    
        RectangleInsets insets = getTickLabelInsets();
        Font font = getTickLabelFont();
        double maxHeight = 0.0;
        if (vertical) {
            FontMetrics fm = g2.getFontMetrics(font);
            Iterator iterator = ticks.iterator();
            while (iterator.hasNext()) {
                Tick tick = (Tick) iterator.next();
                Rectangle2D labelBounds = TextUtilities.getTextBounds(
                    tick.getText(), g2, fm
                );
                if (labelBounds.getWidth() + insets.getTop() 
                        + insets.getBottom() > maxHeight) {
                    maxHeight = labelBounds.getWidth() 
                                + insets.getTop() + insets.getBottom();
                }
            }
        }
        else {
            LineMetrics metrics = font.getLineMetrics(
                "ABCxyz", g2.getFontRenderContext()
            );
            maxHeight = metrics.getHeight() 
                        + insets.getTop() + insets.getBottom();
        }
        return maxHeight;
        
    }

    /**
     * A utility method for determining the width of the widest tick label.
     *
     * @param ticks  the ticks.
     * @param g2  the graphics device.
     * @param drawArea  the area within which the plot and axes should be drawn.
     * @param vertical  a flag that indicates whether or not the tick labels 
     *                  are 'vertical'.
     *
     * @return The width of the tallest tick label.
     */
    protected double findMaximumTickLabelWidth(List ticks, 
                                               Graphics2D g2, 
                                               Rectangle2D drawArea, 
                                               boolean vertical) {
                                                   
        RectangleInsets insets = getTickLabelInsets();
        Font font = getTickLabelFont();
        double maxWidth = 0.0;
        if (!vertical) {
            FontMetrics fm = g2.getFontMetrics(font);
            Iterator iterator = ticks.iterator();
            while (iterator.hasNext()) {
                Tick tick = (Tick) iterator.next();
                Rectangle2D labelBounds = TextUtilities.getTextBounds(
                    tick.getText(), g2, fm
                );
                if (labelBounds.getWidth() + insets.getLeft() 
                        + insets.getRight() > maxWidth) {
                    maxWidth = labelBounds.getWidth() 
                               + insets.getLeft() + insets.getRight();
                }
            }
        }
        else {
            LineMetrics metrics = font.getLineMetrics(
                "ABCxyz", g2.getFontRenderContext()
            );
            maxWidth = metrics.getHeight() 
                       + insets.getTop() + insets.getBottom();
        }
        return maxWidth;
        
    }

    /**
     * Returns a flag that controls the direction of values on the axis.
     * <P>
     * For a regular axis, values increase from left to right (for a horizontal
     * axis) and bottom to top (for a vertical axis).  When the axis is
     * 'inverted', the values increase in the opposite direction.
     *
     * @return The flag.
     */
    public boolean isInverted() {
        return this.inverted;
    }

    /**
     * Sets a flag that controls the direction of values on the axis, and
     * notifies registered listeners that the axis has changed.
     *
     * @param flag  the flag.
     */
    public void setInverted(boolean flag) {

        if (this.inverted != flag) {
            this.inverted = flag;
            notifyListeners(new AxisChangeEvent(this));
        }

    }

    /**
     * Returns the flag that controls whether or not the axis range is 
     * automatically adjusted to fit the data values.
     *
     * @return The flag.
     */
    public boolean isAutoRange() {
        return this.autoRange;
    }

    /**
     * Sets a flag that determines whether or not the axis range is
     * automatically adjusted to fit the data, and notifies registered
     * listeners that the axis has been modified.
     *
     * @param auto  the new value of the flag.
     */
    public void setAutoRange(boolean auto) {
        setAutoRange(auto, true);
    }

    /**
     * Sets the auto range attribute.  If the <code>notify</code> flag is set, 
     * an {@link AxisChangeEvent} is sent to registered listeners.
     *
     * @param auto  the flag.
     * @param notify  notify listeners?
     */
    protected void setAutoRange(boolean auto, boolean notify) {
        if (this.autoRange != auto) {
            this.autoRange = auto;
            if (this.autoRange) {
                autoAdjustRange();
            }
            if (notify) {
                notifyListeners(new AxisChangeEvent(this));
            }
        }
    }

    /**
     * Returns the minimum size allowed for the axis range when it is 
     * automatically calculated.
     *
     * @return The minimum range.
     */
    public double getAutoRangeMinimumSize() {
        return this.autoRangeMinimumSize;
    }

    /**
     * Sets the auto range minimum size and sends an {@link AxisChangeEvent} 
     * to all registered listeners.
     *
     * @param size  the size.
     */
    public void setAutoRangeMinimumSize(double size) {
        setAutoRangeMinimumSize(size, true);
    }

    /**
     * Sets the minimum size allowed for the axis range when it is 
     * automatically calculated.
     * <p>
     * If requested, an {@link AxisChangeEvent} is forwarded to all registered 
     * listeners.
     *
     * @param size  the new minimum.
     * @param notify  notify listeners?
     */
    public void setAutoRangeMinimumSize(double size, boolean notify) {

        // check argument...
        if (size <= 0.0) {
            throw new IllegalArgumentException(
                "NumberAxis.setAutoRangeMinimumSize(double): must be > 0.0.");
        }

        // make the change...
        if (this.autoRangeMinimumSize != size) {
            this.autoRangeMinimumSize = size;
            if (this.autoRange) {
                autoAdjustRange();
            }
            if (notify) {
                notifyListeners(new AxisChangeEvent(this));
            }
        }

    }

    /**
     * Returns the lower margin for the axis, expressed as a percentage of the 
     * axis range.  This controls the space added to the lower end of the axis 
     * when the axis range is automatically calculated (it is ignored when the 
     * axis range is set explicitly). The default value is 0.05 (five percent).
     *
     * @return The lower margin.
     */
    public double getLowerMargin() {
        return this.lowerMargin;
    }

    /**
     * Sets the lower margin for the axis (as a percentage of the axis range) 
     * and sends an {@link AxisChangeEvent} to all registered listeners.  This
     * margin is added only when the axis range is auto-calculated - if you set 
     * the axis range manually, the margin is ignored.
     *
     * @param margin  the margin percentage (for example, 0.05 is five percent).
     */
    public void setLowerMargin(double margin) {
        this.lowerMargin = margin;
        if (isAutoRange()) {
            autoAdjustRange();
        }
        notifyListeners(new AxisChangeEvent(this));
    }

    /**
     * Returns the upper margin for the axis, expressed as a percentage of the 
     * axis range.  This controls the space added to the lower end of the axis 
     * when the axis range is automatically calculated (it is ignored when the 
     * axis range is set explicitly). The default value is 0.05 (five percent).
     *
     * @return The upper margin.
     */
    public double getUpperMargin() {
        return this.upperMargin;
    }

    /**
     * Sets the upper margin for the axis (as a percentage of the axis range) 
     * and sends an {@link AxisChangeEvent} to all registered listeners.  This 
     * margin is added only when the axis range is auto-calculated - if you set
     * the axis range manually, the margin is ignored.
     *
     * @param margin  the margin percentage (for example, 0.05 is five percent).
     */
    public void setUpperMargin(double margin) {
        this.upperMargin = margin;
        if (isAutoRange()) {
            autoAdjustRange();
        }
        notifyListeners(new AxisChangeEvent(this));
    }

    /**
     * Returns the fixed auto range.
     *
     * @return The length.
     */
    public double getFixedAutoRange() {
        return this.fixedAutoRange;
    }

    /**
     * Sets the fixed auto range for the axis.
     *
     * @param length  the range length.
     */
    public void setFixedAutoRange(double length) {

        this.fixedAutoRange = length;
        notifyListeners(new AxisChangeEvent(this));

    }

    /**
     * Returns the lower bound of the axis range.
     *
     * @return The lower bound.
     */
    public double getLowerBound() {
        return this.range.getLowerBound();
    }

    /**
     * Sets the lower bound for the axis range.  An {@link AxisChangeEvent} is 
     * sent to all registered listeners.
     *
     * @param min  the new minimum.
     */
    public void setLowerBound(double min) {
        if (this.range.getUpperBound() > min) {
            setRange(new Range(min, this.range.getUpperBound()));            
        }
        else {
            setRange(new Range(min, min + 1.0));                        
        }
    }

    /**
     * Returns the upper bound for the axis range.
     *
     * @return The upper bound.
     */
    public double getUpperBound() {
        return this.range.getUpperBound();
    }

    /**
     * Sets the upper bound for the axis range.  An {@link AxisChangeEvent} is 
     * sent to all registered listeners.
     *
     * @param max  the new maximum.
     */
    public void setUpperBound(double max) {

        if (this.range.getLowerBound() < max) {
            setRange(new Range(this.range.getLowerBound(), max));
        }
        else {
            setRange(max - 1.0, max);
        }

    }

    /**
     * Returns the range for the axis.
     *
     * @return The axis range (never <code>null</code>).
     */
    public Range getRange() {
        return this.range;
    }

    /**
     * Sets the range attribute and sends an {@link AxisChangeEvent} to all 
     * registered listeners.  As a side-effect, the auto-range flag is set to 
     * <code>false</code>.
     *
     * @param range  the range (<code>null</code> not permitted).
     */
    public void setRange(Range range) {
        // defer argument checking
        setRange(range, true, true);
    }

    /**
     * Sets the range for the axis, if requested, sends an 
     * {@link AxisChangeEvent} to all registered listeners.  As a side-effect, 
     * the auto-range flag is set to <code>false</code> (optional).
     *
     * @param range  the range (<code>null</code> not permitted).
     * @param turnOffAutoRange  a flag that controls whether or not the auto 
     *                          range is turned off.         
     * @param notify  a flag that controls whether or not listeners are 
     *                notified.
     */
    public void setRange(Range range, boolean turnOffAutoRange, 
                         boolean notify) {
        if (range == null) {
            throw new IllegalArgumentException("Null 'range' argument.");
        }
        if (turnOffAutoRange) {
            this.autoRange = false;
        }
        this.range = range;
        if (notify) {
            notifyListeners(new AxisChangeEvent(this));
        }
    }

    /**
     * Sets the axis range and sends an {@link AxisChangeEvent} to all 
     * registered listeners.  As a side-effect, the auto-range flag is set to 
     * <code>false</code>.
     *
     * @param lower  the lower axis limit.
     * @param upper  the upper axis limit.
     */
    public void setRange(double lower, double upper) {
        setRange(new Range(lower, upper));
    }