texttitle.java

java图形利器

     */
    public String getURLText() {
        return this.urlText;
    }

    /**
     * Sets the URL text to the specified text and sends a 
     * {@link TitleChangeEvent} to all registered listeners.
     *
     * @param text  the text (<code>null</code> permitted).
     */
    public void setURLText(String text) {
        this.urlText = text;
        notifyListeners(new TitleChangeEvent(this));
    }
    
    /**
     * Returns the flag that controls whether or not the title expands to fit
     * the available space.
     * 
     * @return The flag.
     */
    public boolean getExpandToFitSpace() {
        return this.expandToFitSpace;   
    }
    
    /**
     * Sets the flag that controls whether the title expands to fit the 
     * available space, and sends a {@link TitleChangeEvent} to all registered
     * listeners.
     * 
     * @param expand  the flag.
     */
    public void setExpandToFitSpace(boolean expand) {
        this.expandToFitSpace = expand;
        notifyListeners(new TitleChangeEvent(this));        
    }

    /**
     * Arranges the contents of the block, within the given constraints, and 
     * returns the block size.
     * 
     * @param g2  the graphics device.
     * @param constraint  the constraint (<code>null</code> not permitted).
     * 
     * @return The block size (in Java2D units, never <code>null</code>).
     */
    public Size2D arrange(Graphics2D g2, RectangleConstraint constraint) {
        RectangleConstraint cc = toContentConstraint(constraint);
        LengthConstraintType w = cc.getWidthConstraintType();
        LengthConstraintType h = cc.getHeightConstraintType();
        Size2D contentSize = null;
        if (w == LengthConstraintType.NONE) {
            if (h == LengthConstraintType.NONE) {
                throw new RuntimeException("Not yet implemented."); 
            }
            else if (h == LengthConstraintType.RANGE) {
                throw new RuntimeException("Not yet implemented."); 
            }
            else if (h == LengthConstraintType.FIXED) {
                throw new RuntimeException("Not yet implemented.");                 
            }            
        }
        else if (w == LengthConstraintType.RANGE) {
            if (h == LengthConstraintType.NONE) {
                throw new RuntimeException("Not yet implemented."); 
            }
            else if (h == LengthConstraintType.RANGE) {
                contentSize = arrangeRR(g2, cc.getWidthRange(), 
                        cc.getHeightRange()); 
            }
            else if (h == LengthConstraintType.FIXED) {
                throw new RuntimeException("Not yet implemented.");                 
            }
        }
        else if (w == LengthConstraintType.FIXED) {
            if (h == LengthConstraintType.NONE) {
                throw new RuntimeException("Not yet implemented."); 
            }
            else if (h == LengthConstraintType.RANGE) {
                throw new RuntimeException("Not yet implemented."); 
            }
            else if (h == LengthConstraintType.FIXED) {
                throw new RuntimeException("Not yet implemented.");                 
            }
        }
        return new Size2D(calculateTotalWidth(contentSize.getWidth()),
                calculateTotalHeight(contentSize.getHeight()));
    }
    
    /**
     * Returns the content size for the title.  This will reflect the fact that
     * a text title positioned on the left or right of a chart will be rotated
     * 90 degrees.
     * 
     * @param g2  the graphics device.
     * @param widthRange  the width range.
     * @param heightRange  the height range.
     * 
     * @return The content size.
     */
    protected Size2D arrangeRR(Graphics2D g2, Range widthRange, 
            Range heightRange) {
        RectangleEdge position = getPosition();
        if (position == RectangleEdge.TOP || position == RectangleEdge.BOTTOM) {
            float maxWidth = (float) widthRange.getUpperBound();
            g2.setFont(this.font);
            this.content = TextUtilities.createTextBlock(this.text, this.font, 
                    this.paint, maxWidth, new G2TextMeasurer(g2));
            this.content.setLineAlignment(this.textAlignment);
            Size2D contentSize = this.content.calculateDimensions(g2);
            if (this.expandToFitSpace) {
                return new Size2D(maxWidth, contentSize.getHeight());
            }
            else {
                return contentSize;
            }
        }
        else if (position == RectangleEdge.LEFT || position 
                == RectangleEdge.RIGHT) {
            float maxWidth = (float) heightRange.getUpperBound();
            g2.setFont(this.font);
            this.content = TextUtilities.createTextBlock(this.text, this.font, 
                    this.paint, maxWidth, new G2TextMeasurer(g2));
            this.content.setLineAlignment(this.textAlignment);
            Size2D contentSize = this.content.calculateDimensions(g2);
            
            // transpose the dimensions, because the title is rotated
            if (this.expandToFitSpace) {
                return new Size2D(contentSize.getHeight(), maxWidth);
            }
            else {
                return new Size2D(contentSize.height, contentSize.width);
            }
        }
        else {
            throw new RuntimeException("Unrecognised exception.");
        }
    }
    
    /**
     * 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) {
        draw(g2, area, null);
    }
    
    /**
     * Draws the block within the specified area.
     * 
     * @param g2  the graphics device.
     * @param area  the area.
     * @param params  if this is an instance of {@link EntityBlockParams} it
     *                is used to determine whether or not an 
     *                {@link EntityCollection} is returned by this method.
     * 
     * @return An {@link EntityCollection} containing a chart entity for the
     *         title, or <code>null</code>.
     */
    public Object draw(Graphics2D g2, Rectangle2D area, Object params) {
        if (this.content == null) {
            return null;   
        }
        area = trimMargin(area);
        drawBorder(g2, area);
        if (this.text.equals("")) {
            return null;
        }
        ChartEntity entity = null;
        if (params instanceof EntityBlockParams) {
            EntityBlockParams p = (EntityBlockParams) params;
            if (p.getGenerateEntities()) {
                entity = new ChartEntity(area, this.toolTipText, this.urlText);    
            }
        }
        area = trimBorder(area);
        if (this.backgroundPaint != null) {
            g2.setPaint(this.backgroundPaint);
            g2.fill(area);
        }
        area = trimPadding(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);
        }
        BlockResult result = new BlockResult();
        if (entity != null) {
            StandardEntityCollection sec = new StandardEntityCollection();
            sec.add(entity);
            result.setEntityCollection(sec);
        }
        return result;
    }

    /**
     * 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();
        g2.setFont(this.font);
        g2.setPaint(this.paint);
        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;
            }
        }
        this.content.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();
        g2.setFont(this.font);
        g2.setPaint(this.paint);
        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;
            }
        }
        this.content.draw(g2, x, y, anchor, x, y, -Math.PI / 2.0);
    }

    /**
     * Tests this title for equality with another object.
     *
     * @param obj  the object (<code>null</code> permitted).
     *
     * @return <code>true</code> or <code>false</code>.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof TextTitle)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        TextTitle that = (TextTitle) obj;
        if (!ObjectUtilities.equal(this.text, that.text)) {
            return false;
        }
        if (!ObjectUtilities.equal(this.font, that.font)) {
            return false;
        }
        if (!PaintUtilities.equal(this.paint, that.paint)) {
            return false;
        }
        if (this.textAlignment != that.textAlignment) {
            return false;
        }
        if (!PaintUtilities.equal(this.backgroundPaint, that.backgroundPaint)) {
            return false;
        }
        return true;
    }

    /**
     * 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);
    }

}