texttitle.java

jfreechart安装程序和使用说明

            throw new IllegalArgumentException(
                "TextTitle.setPaint(...): null paint not permitted."
            );
        }
        if (!this.paint.equals(paint)) {
            this.paint = paint;
            notifyListeners(new TitleChangeEvent(this));
        }
    }

    /**
     * Returns the background paint.
     *
     * @return The paint (possibly <code>null</code>).
     */
    public Paint getBackgroundPaint() {
        return this.backgroundPaint;
    }

    /**
     * Sets the background paint and sends a {@link TitleChangeEvent} to all registered listeners.
     * If you set this attribute to <code>null</code>, no background is painted (which makes the 
     * title background transparent).
     *
     * @param paint  the background paint (<code>null</code> permitted).
     */
    public void setBackgroundPaint(Paint paint) {
        this.backgroundPaint = paint;
        notifyListeners(new TitleChangeEvent(this));
    }

    /**
     * Returns the preferred width of the title.  This will only be called when the title
     * is being drawn at the left or right of a chart.
     *
     * @param g2  the graphics device.
     * @param height  the height.
     *
     * @return The preferred width of the title.
     */
    public float getPreferredWidth(Graphics2D g2, float height) {
        float result = 0.0f;
        if (this.text != null && !this.text.equals("")) {
            g2.setFont(this.font);
            TextBlock title = TextUtilities.createTextBlock(
                this.text, this.font, this.paint, height, new G2TextMeasurer(g2)
            );
            Size2D d = title.calculateDimensions(g2);
            result = (float) getSpacer().getAdjustedWidth(d.getHeight());
                                                     // use height here because the title
                                                     // is displayed rotated
        }
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("Title preferred width = " + result);   
        }
        return result;
    }

    /**
     * Returns the preferred height of the title.
     *
     * @param g2  the graphics device.
     * @param width  the width.
     *
     * @return The preferred height of the title.
     */
    public float getPreferredHeight(Graphics2D g2, float width) {
        float result = 0.0f;
        if (this.text != null && !this.text.equals("")) {
            g2.setFont(this.font);
            float textWidth = (float) getSpacer().trimWidth(width);
            TextBlock title = TextUtilities.createTextBlock(
                this.text, this.font, this.paint, textWidth, new G2TextMeasurer(g2)
            );
            Size2D d = title.calculateDimensions(g2);
            result = (float) getSpacer().getAdjustedHeight(d.getHeight());
        }
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("Title preferred height = " + result);   
        }
        return result;
    }

    /**
     * Draws the title on a Java 2D graphics device (such as the screen or a printer).
     *
     * @param g2  the graphics device.
     * @param area  the area allocated for the title.
     */
    public void draw(Graphics2D g2, Rectangle2D area) {
        if (LOGGER.isDebugEnabled()) {
            LOGGER.debug("Drawing title to area " + area.toString());
        }
        if (this.text.equals("")) {
            return;
        }
        if (this.backgroundPaint != null) {
            g2.setPaint(this.backgroundPaint);
            g2.fill(area);
        }
        RectangleEdge position = getPosition();
        if (position == RectangleEdge.TOP || position == RectangleEdge.BOTTOM) {
            drawHorizontal(g2, area);
        }
        else if (position == RectangleEdge.LEFT || position == RectangleEdge.RIGHT) {
            drawVertical(g2, area);
        }
    }
    
    /**
     * Draws a the title horizontally within the specified area.  This method will be called
     * from the {@link #draw(Graphics2D, Rectangle2D) draw} method.
     * 
     * @param g2  the graphics device.
     * @param area  the area for the title.
     */
    protected void drawHorizontal(Graphics2D g2, Rectangle2D area) {
        Rectangle2D titleArea = (Rectangle2D) area.clone();
        getSpacer().trim(titleArea);
        g2.setFont(this.font);
        g2.setPaint(this.paint);
        TextBlock title = TextUtilities.createTextBlock(
            this.text, this.font, this.paint, (float) titleArea.getWidth(), new G2TextMeasurer(g2)
        );
        TextBlockAnchor anchor = null;
        float x = 0.0f;
        HorizontalAlignment horizontalAlignment = getHorizontalAlignment();
        if (horizontalAlignment == HorizontalAlignment.LEFT) {
            x = (float) titleArea.getX();
            anchor = TextBlockAnchor.TOP_LEFT;
        }
        else if (horizontalAlignment == HorizontalAlignment.RIGHT) {
            x = (float) titleArea.getMaxX();
            anchor = TextBlockAnchor.TOP_RIGHT;
        }
        else if (horizontalAlignment == HorizontalAlignment.CENTER) {
            x = (float) titleArea.getCenterX();
            anchor = TextBlockAnchor.TOP_CENTER;
        }
        float y = 0.0f;
        RectangleEdge position = getPosition();
        if (position == RectangleEdge.TOP) {
            y = (float) titleArea.getY();
        }
        else if (position == RectangleEdge.BOTTOM) {
            y = (float) titleArea.getMaxY();
            if (horizontalAlignment == HorizontalAlignment.LEFT) {
                anchor = TextBlockAnchor.BOTTOM_LEFT;
            }
            else if (horizontalAlignment == HorizontalAlignment.CENTER) {
                anchor = TextBlockAnchor.BOTTOM_CENTER;
            }
            else if (horizontalAlignment == HorizontalAlignment.RIGHT) {
                anchor = TextBlockAnchor.BOTTOM_RIGHT;
            }
        }
        title.draw(g2, x, y, anchor);
    }
    
    /**
     * Draws a the title vertically within the specified area.  This method will be called
     * from the {@link #draw(Graphics2D, Rectangle2D) draw} method.
     * 
     * @param g2  the graphics device.
     * @param area  the area for the title.
     */
    protected void drawVertical(Graphics2D g2, Rectangle2D area) {
        Rectangle2D titleArea = (Rectangle2D) area.clone();
        getSpacer().trim(titleArea);
        g2.setFont(this.font);
        g2.setPaint(this.paint);
        TextBlock title = TextUtilities.createTextBlock(
            this.text, this.font, this.paint, (float) titleArea.getHeight(), new G2TextMeasurer(g2)
        );
        TextBlockAnchor anchor = null;
        float y = 0.0f;
        VerticalAlignment verticalAlignment = getVerticalAlignment();
        if (verticalAlignment == VerticalAlignment.TOP) {
            y = (float) titleArea.getY();
            anchor = TextBlockAnchor.TOP_RIGHT;
        }
        else if (verticalAlignment == VerticalAlignment.BOTTOM) {
            y = (float) titleArea.getMaxY();
            anchor = TextBlockAnchor.TOP_LEFT;
        }
        else if (verticalAlignment == VerticalAlignment.CENTER) {
            y = (float) titleArea.getCenterY();
            anchor = TextBlockAnchor.TOP_CENTER;
        }
        float x = 0.0f;
        RectangleEdge position = getPosition();
        if (position == RectangleEdge.LEFT) {
            x = (float) titleArea.getX();
        }
        else if (position == RectangleEdge.RIGHT) {
            x = (float) titleArea.getMaxX();
            if (verticalAlignment == VerticalAlignment.TOP) {
                anchor = TextBlockAnchor.BOTTOM_RIGHT;
            }
            else if (verticalAlignment == VerticalAlignment.CENTER) {
                anchor = TextBlockAnchor.BOTTOM_CENTER;
            }
            else if (verticalAlignment == VerticalAlignment.BOTTOM) {
                anchor = TextBlockAnchor.BOTTOM_LEFT;
            }
        }
        title.draw(g2, x, y, anchor, x, y, -Math.PI / 2.0);
    }

    /**
     * Tests this title 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 TextTitle) {

            TextTitle t = (TextTitle) obj;
            if (super.equals(obj)) {
                if (!ObjectUtils.equal(this.text, t.text)) {
                    return false;
                }
                if (!ObjectUtils.equal(this.font, t.font)) {
                    return false;
                }
                if (!ObjectUtils.equal(this.paint, t.paint)) {
                    return false;
                }
                if (!ObjectUtils.equal(this.backgroundPaint, t.backgroundPaint)) {
                    return false;
                }
                return true;
            }
        }

        return false;

    }

    /**
     * Returns a hash code.
     * 
     * @return A hash code.
     */
    public int hashCode() {
        int result = super.hashCode();
        result = 29 * result + (this.text != null ? this.text.hashCode() : 0);
        result = 29 * result + (this.font != null ? this.font.hashCode() : 0);
        result = 29 * result + (this.paint != null ? this.paint.hashCode() : 0);
        result = 29 * result + (this.backgroundPaint != null ? this.backgroundPaint.hashCode() : 0);
        return result;
    }

    /**
     * Returns a clone of this object.
     * 
     * @return A clone.
     * 
     * @throws CloneNotSupportedException never.
     */
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
    
    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException  if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        SerialUtilities.writePaint(this.paint, stream);
        SerialUtilities.writePaint(this.backgroundPaint, stream);
    }

    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream) throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        this.paint = SerialUtilities.readPaint(stream);
        this.backgroundPaint = SerialUtilities.readPaint(stream);
    }

}