dialvalueindicator.java

java图形利器

     * Returns the background paint.
     * 
     * @return The background paint.
     */
    public Paint getBackgroundPaint() {
        return this.backgroundPaint;
    }
    
    /**
     * Sets the background paint.
     * 
     * @param paint  the paint (<code>null</code> not permitted).
     */
    public void setBackgroundPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.backgroundPaint = paint;
        notifyListeners(new DialLayerChangeEvent(this));      
    }
    
    /**
     * Returns the outline stroke.
     * 
     * @return The outline stroke.
     */
    public Stroke getOutlineStroke() {
        return this.outlineStroke;
    }
     
    /**
     * Sets the outline stroke.
     * 
     * @param stroke  the stroke (<code>null</code> not permitted).
     */
    public void setOutlineStroke(Stroke stroke) {
        if (stroke == null) {
            throw new IllegalArgumentException("Null 'stroke' argument.");
        }
        this.outlineStroke = stroke;
        notifyListeners(new DialLayerChangeEvent(this));
    }
    
    /**
     * Returns the outline paint.
     * 
     * @return The outline paint.
     */
    public Paint getOutlinePaint() {
        return this.outlinePaint;
    }
    
    /**
     * Sets the outline paint and sends a {@link DialLayerChangeEvent} to all
     * registered listeners.
     * 
     * @param paint  the paint.
     */
    public void setOutlinePaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.outlinePaint = paint;
        notifyListeners(new DialLayerChangeEvent(this));
    }
    
    /**
     * Returns the insets.
     * 
     * @return The insets (never <code>null</code>).
     */
    public RectangleInsets getInsets() {
        return this.insets;
    }
    
    /**
     * Sets the insets.
     * 
     * @param insets  the insets (<code>null</code> not permitted).
     */
    public void setInsets(RectangleInsets insets) {
        if (insets == null) {
            throw new IllegalArgumentException("Null 'insets' argument.");
        }
        this.insets = insets;
        notifyListeners(new DialLayerChangeEvent(this));        
    }
    
    /**
     * Returns the value anchor.
     * 
     * @return The value anchor.
     */
    public RectangleAnchor getValueAnchor() {
        return this.valueAnchor;
    }
    
    /**
     * Sets the value anchor.
     * 
     * @param anchor  the anchor (<code>null</code> not permitted).
     */
    public void setValueAnchor(RectangleAnchor anchor) {
        if (anchor == null) {
            throw new IllegalArgumentException("Null 'anchor' argument.");
        }
        this.valueAnchor = anchor;
        notifyListeners(new DialLayerChangeEvent(this));                
    }
    
    /**
     * Returns the text anchor.
     * 
     * @return The text anchor.
     */
    public TextAnchor getTextAnchor() {
        return this.textAnchor;
    }
    
    /**
     * Sets the text anchor.
     * 
     * @param anchor  the anchor (<code>null</code> not permitted).
     */
    public void setTextAnchor(TextAnchor anchor) {
        if (anchor == null) {
            throw new IllegalArgumentException("Null 'anchor' argument.");
        }
        this.textAnchor = anchor;
        notifyListeners(new DialLayerChangeEvent(this));                        
    }
    
    /**
     * Returns <code>true</code> to indicate that this layer should be 
     * clipped within the dial window. 
     *
     * @return <code>true</code>.
     */
    public boolean isClippedToWindow() {
        return true;
    }
    
    /**
     * Draws the background to the specified graphics device.  If the dial
     * frame specifies a window, the clipping region will already have been 
     * set to this window before this method is called.
     *
     * @param g2  the graphics device (<code>null</code> not permitted).
     * @param plot  the plot (ignored here).
     * @param frame  the dial frame (ignored here).
     * @param view  the view rectangle (<code>null</code> not permitted). 
     */
    public void draw(Graphics2D g2, DialPlot plot, Rectangle2D frame, 
            Rectangle2D view) {

        // work out the anchor point
        Rectangle2D f = DialPlot.rectangleByRadius(frame, this.radius, 
                this.radius);
        Arc2D arc = new Arc2D.Double(f, this.angle, 0.0, Arc2D.OPEN);
        Point2D pt = arc.getStartPoint();
        
        // calculate the bounds of the template value
        FontMetrics fm = g2.getFontMetrics(this.font);
        String s = this.formatter.format(this.templateValue);
        Rectangle2D tb = TextUtilities.getTextBounds(s, g2, fm);

        // align this rectangle to the frameAnchor
        Rectangle2D bounds = RectangleAnchor.createRectangle(new Size2D(
                tb.getWidth(), tb.getHeight()), pt.getX(), pt.getY(), 
                this.frameAnchor);
        
        // add the insets
        Rectangle2D fb = this.insets.createOutsetRectangle(bounds);

        // draw the background
        g2.setPaint(this.backgroundPaint);
        g2.fill(fb);

        // draw the border
        g2.setStroke(this.outlineStroke);
        g2.setPaint(this.outlinePaint);
        g2.draw(fb);
        
        
        // now find the text anchor point
        double value = plot.getValue(this.datasetIndex);
        String valueStr = this.formatter.format(value);
        Point2D pt2 = RectangleAnchor.coordinates(bounds, this.valueAnchor);
        g2.setPaint(this.paint);
        g2.setFont(this.font);
        TextUtilities.drawAlignedString(valueStr, g2, (float) pt2.getX(), 
                (float) pt2.getY(), this.textAnchor);
        
    }
    
    /**
     * Tests this instance for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null</code> permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof DialValueIndicator)) {
            return false;
        }
        DialValueIndicator that = (DialValueIndicator) obj;
        if (this.datasetIndex != that.datasetIndex) {
            return false;
        }
        if (this.angle != that.angle) {
            return false;
        }
        if (this.radius != that.radius) {
            return false;
        }
        if (!this.frameAnchor.equals(that.frameAnchor)) {
            return false;
        }
        if (!this.templateValue.equals(that.templateValue)) {
            return false;
        }
        if (!this.font.equals(that.font)) {
            return false;
        }
        if (!PaintUtilities.equal(this.paint, that.paint)) {
            return false;
        }
        if (!PaintUtilities.equal(this.backgroundPaint, that.backgroundPaint)) {
            return false;
        }
        if (!this.outlineStroke.equals(that.outlineStroke)) {
            return false;
        }
        if (!PaintUtilities.equal(this.outlinePaint, that.outlinePaint)) {
            return false;
        }
        if (!this.insets.equals(that.insets)) {
            return false;
        }
        if (!this.valueAnchor.equals(that.valueAnchor)) {
            return false;
        }
        if (!this.textAnchor.equals(that.textAnchor)) {
            return false;
        }
        
        return true;
    }
    
    /**
     * Returns a hash code for this instance.
     * 
     * @return The hash code.
     */
    public int hashCode() {
        int result = 193;
        result = 37 * result + HashUtilities.hashCodeForPaint(this.paint);
        result = 37 * result + HashUtilities.hashCodeForPaint(
                this.backgroundPaint);
        result = 37 * result + HashUtilities.hashCodeForPaint(
                this.outlinePaint);
        result = 37 * result + this.outlineStroke.hashCode();
        return result;
    }
    
    /**
     * Returns a clone of this instance.
     *
     * @return The clone.
     *
     * @throws CloneNotSupportedException if some attribute of this instance
     *     cannot be cloned.
     */
    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);
        SerialUtilities.writePaint(this.outlinePaint, stream);
        SerialUtilities.writeStroke(this.outlineStroke, 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);
        this.outlinePaint = SerialUtilities.readPaint(stream);
        this.outlineStroke = SerialUtilities.readStroke(stream);
    }

}