spiderwebplot.java

关于jfreechart的电子说明书,一种说明图型使用的介绍

    }

    /**
     * Draws a radar plot polygon.
     * 
     * @param g2 the graphics device.
     * @param plotArea the area we are plotting in (already adjusted).
     * @param centre the centre point of the radar axes
     * @param info chart rendering info.
     * @param series the series within the dataset we are plotting
     * @param catCount the number of categories per radar plot
     * @param headH the data point height
     * @param headW the data point width
     */
    protected void drawRadarPoly(Graphics2D g2, 
                                 Rectangle2D plotArea,
                                 Point2D centre,
                                 PlotRenderingInfo info,
                                 int series, int catCount,
                                 double headH, double headW) {

        Polygon polygon = new Polygon();

        // plot the data...
        for (int cat = 0; cat < catCount; cat++) {
            Number dataValue = getPlotValue(series, cat);

            if (dataValue != null) {
                double value = dataValue.doubleValue();
  
                if (value > 0) { // draw the polygon series...
              
                    // Finds our starting angle from the centre for this axis

                    double angle = getStartAngle()
                        + (getDirection().getFactor() * cat * 360 / catCount);

                    // The following angle calc will ensure there isn't a top 
                    // vertical axis - this may be useful if you don't want any 
                    // given criteria to 'appear' move important than the 
                    // others..
                    //  + (getDirection().getFactor() 
                    //        * (cat + 0.5) * 360 / catCount);

                    // find the point at the appropriate distance end point 
                    // along the axis/angle identified above and add it to the
                    // polygon

                    Point2D point = getWebPoint(plotArea, angle, 
                            value / this.maxValue);
                    polygon.addPoint((int) point.getX(), (int) point.getY());

                    // put an elipse at the point being plotted..
          
                    // TODO add tooltip/URL capability to this elipse
          
                    Paint paint = getSeriesPaint(series);
                    Paint outlinePaint = getSeriesOutlinePaint(series);
                    Stroke outlineStroke = getSeriesOutlineStroke(series);

                    Ellipse2D head = new Ellipse2D.Double(point.getX() 
                            - headW / 2, point.getY() - headH / 2, headW, 
                            headH);
                    g2.setPaint(paint);
                    g2.fill(head);
                    g2.setStroke(outlineStroke);
                    g2.setPaint(outlinePaint);
                    g2.draw(head);

                    // then draw the axis and category label, but only on the 
                    // first time through.....

                    if (series == 0) {
                        Point2D endPoint = getWebPoint(plotArea, angle, 1); 
                                                             // 1 = end of axis
                        Line2D  line = new Line2D.Double(centre, endPoint);
                        g2.draw(line);
                        drawLabel(g2, plotArea, value, cat, angle, 
                                360.0 / catCount);
                    }
                }
            }
        }
        // Plot the polygon
    
        Paint paint = getSeriesPaint(series);
        g2.setPaint(paint);
        g2.draw(polygon);

        // Lastly, fill the web polygon if this is required
    
        if (this.webFilled) {
            g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 
                    0.1f));
            g2.fill(polygon);
            g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 
                    getForegroundAlpha()));
        }
    }

    /**
     * Returns the value to be plotted at the interseries of the 
     * series and the category.  This allows us to plot
     * BY_ROW or BY_COLUMN which basically is just reversing the
     * definition of the categories and data series being plotted
     * 
     * @param series the series to be plotted 
     * @param cat the category within the series to be plotted
     * 
     * @return The value to be plotted
     */
    Number getPlotValue(int series, int cat) {
        Number value = null;
        if (this.dataExtractOrder == TableOrder.BY_ROW) {
            value = this.dataset.getValue(series, cat);
        }
        else if (this.dataExtractOrder == TableOrder.BY_COLUMN) {
            value = this.dataset.getValue(cat, series);
        }
        return value;
    }

    /**
     * Draws the label for one axis.
     * 
     * @param g2  the graphics device.
     * @param plotArea  the plot area
     * @param value  the value of the label.
     * @param cat  the category (zero-based index).
     * @param startAngle  the starting angle.
     * @param extent  the extent of the arc.
     */
    protected void drawLabel(Graphics2D g2, Rectangle2D plotArea, double value, 
                             int cat, double startAngle, double extent) {
        FontRenderContext frc = g2.getFontRenderContext();
 
        String label = null;
        if (this.dataExtractOrder == TableOrder.BY_ROW) {
            // if series are in rows, then the categories are the column keys
            label = this.labelGenerator.generateColumnLabel(this.dataset, cat);
        }
        else {
            // if series are in columns, then the categories are the row keys
            label = this.labelGenerator.generateRowLabel(this.dataset, cat);
        }
 
        Rectangle2D labelBounds = getLabelFont().getStringBounds(label, frc);
        LineMetrics lm = getLabelFont().getLineMetrics(label, frc);
        double ascent = lm.getAscent();

        Point2D labelLocation = calculateLabelLocation(labelBounds, ascent, 
                plotArea, startAngle);

        Composite saveComposite = g2.getComposite();
    
        g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 
                1.0f));
        g2.setPaint(getLabelPaint());
        g2.setFont(getLabelFont());
        g2.drawString(label, (float) labelLocation.getX(), 
                (float) labelLocation.getY());
        g2.setComposite(saveComposite);
    }

    /**
     * Returns the location for a label
     * 
     * @param labelBounds the label bounds.
     * @param ascent the ascent (height of font).
     * @param plotArea the plot area
     * @param startAngle the start angle for the pie series.
     * 
     * @return The location for a label.
     */
    protected Point2D calculateLabelLocation(Rectangle2D labelBounds, 
                                             double ascent,
                                             Rectangle2D plotArea, 
                                             double startAngle)
    {
        Arc2D arc1 = new Arc2D.Double(plotArea, startAngle, 0, Arc2D.OPEN);
        Point2D point1 = arc1.getEndPoint();

        double deltaX = -(point1.getX() - plotArea.getCenterX()) 
                        * this.axisLabelGap;
        double deltaY = -(point1.getY() - plotArea.getCenterY()) 
                        * this.axisLabelGap;

        double labelX = point1.getX() - deltaX;
        double labelY = point1.getY() - deltaY;

        if (labelX < plotArea.getCenterX()) {
            labelX -= labelBounds.getWidth();
        }
    
        if (labelX == plotArea.getCenterX()) {
            labelX -= labelBounds.getWidth() / 2;
        }

        if (labelY > plotArea.getCenterY()) {
            labelY += ascent;
        }

        return new Point2D.Double(labelX, labelY);
    }
    
    /**
     * Tests this plot 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 SpiderWebPlot)) {
            return false;   
        }
        if (!super.equals(obj)) {
            return false;   
        }
        SpiderWebPlot that = (SpiderWebPlot) obj;
        if (!this.dataExtractOrder.equals(that.dataExtractOrder)) {
            return false;   
        }
        if (this.headPercent != that.headPercent) {
            return false;   
        }
        if (this.interiorGap != that.interiorGap) {
            return false;   
        }
        if (this.startAngle != that.startAngle) {
            return false;   
        }
        if (!this.direction.equals(that.direction)) {
            return false;   
        }
        if (this.maxValue != that.maxValue) {
            return false;   
        }
        if (this.webFilled != that.webFilled) {
            return false;   
        }
        if (!ShapeUtilities.equal(this.legendItemShape, that.legendItemShape)) {
            return false;   
        }
        if (!PaintUtilities.equal(this.seriesPaint, that.seriesPaint)) {
            return false;   
        }
        if (!this.seriesPaintList.equals(that.seriesPaintList)) {
            return false;   
        }
        if (!PaintUtilities.equal(this.baseSeriesPaint, that.baseSeriesPaint)) {
            return false;   
        }
        if (!PaintUtilities.equal(this.seriesOutlinePaint, 
                that.seriesOutlinePaint)) {
            return false;   
        }
        if (!this.seriesOutlinePaintList.equals(that.seriesOutlinePaintList)) {
            return false;   
        }
        if (!PaintUtilities.equal(this.baseSeriesOutlinePaint, 
                that.baseSeriesOutlinePaint)) {
            return false;   
        }
        if (!ObjectUtilities.equal(this.seriesOutlineStroke, 
                that.seriesOutlineStroke)) {
            return false;   
        }
        if (!this.seriesOutlineStrokeList.equals(
                that.seriesOutlineStrokeList)) {
            return false;   
        }
        if (!this.baseSeriesOutlineStroke.equals(
                that.baseSeriesOutlineStroke)) {
            return false;   
        }
        if (!this.labelFont.equals(that.labelFont)) {
            return false;   
        }
        if (!PaintUtilities.equal(this.labelPaint, that.labelPaint)) {
            return false;   
        }
        if (!this.labelGenerator.equals(that.labelGenerator)) {
            return false;   
        }
        return true;
    }
    
    /**
     * 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.writeShape(this.legendItemShape, stream);
        SerialUtilities.writePaint(this.seriesPaint, stream);
        SerialUtilities.writePaint(this.baseSeriesPaint, stream);
        SerialUtilities.writePaint(this.seriesOutlinePaint, stream);
        SerialUtilities.writePaint(this.baseSeriesOutlinePaint, stream);
        SerialUtilities.writeStroke(this.seriesOutlineStroke, stream);
        SerialUtilities.writeStroke(this.baseSeriesOutlineStroke, stream);
        SerialUtilities.writePaint(this.labelPaint, 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.legendItemShape = SerialUtilities.readShape(stream);
        this.seriesPaint = SerialUtilities.readPaint(stream);
        this.baseSeriesPaint = SerialUtilities.readPaint(stream);
        this.seriesOutlinePaint = SerialUtilities.readPaint(stream);
        this.baseSeriesOutlinePaint = SerialUtilities.readPaint(stream);
        this.seriesOutlineStroke = SerialUtilities.readStroke(stream);
        this.baseSeriesOutlineStroke = SerialUtilities.readStroke(stream);
        this.labelPaint = SerialUtilities.readPaint(stream);
       
        if (dataset != null) {
            dataset.addChangeListener(this);
        }
    } 

}