polarplot.java

jfreechart安装程序和使用说明

        if (!DatasetUtilities.isEmptyOrNull(this.dataset)) {
            int seriesCount = this.dataset.getSeriesCount();
            for (int series = 0; series < seriesCount; series++) {
                this.renderer.drawSeries(
                    g2, dataArea, info, this, this.dataset, series
                );
            }
        }
        else {
            drawNoDataMessage(g2, dataArea);
        }
    }
   
    /**
     * Draws the gridlines for the plot, if they are visible.
     *
     * @param g2  the graphics device.
     * @param dataArea  the data area.
     * @param angularTicks  the ticks for the angular axis.
     * @param radialTicks  the ticks for the radial axis.
     */
    protected void drawGridlines(Graphics2D g2, Rectangle2D dataArea, 
                                 List angularTicks, List radialTicks) {

        // no renderer, no gridlines...
        if (this.renderer == null) {
            return;
        }
       
        // draw the domain grid lines, if any...
        if (isAngleGridlinesVisible()) {
            Stroke gridStroke = getAngleGridlineStroke();
            Paint gridPaint = getAngleGridlinePaint();
            if ((gridStroke != null) && (gridPaint != null)) {
                this.renderer.drawAngularGridLines(g2, this, angularTicks, dataArea);
            }
        }
       
        // draw the radius grid lines, if any...
        if (isRadiusGridlinesVisible()) {
            Stroke gridStroke = getRadiusGridlineStroke();
            Paint gridPaint = getRadiusGridlinePaint();
            if ((gridStroke != null) && (gridPaint != null)) {
                this.renderer.drawRadialGridLines(g2, this, this.radiusAxis, radialTicks, dataArea);
            }
        }      
    }
   
    /**
     * Zooms the axis ranges by the specified percentage about the anchor point.
     *
     * @param percent  the amount of the zoom.
     */
    public void zoom(double percent) {
        if (percent > 0.0) {
            double radius = getMaxRadius();
            double scaledRadius = radius * percent;
            this.radiusAxis.setUpperBound(scaledRadius);
            getRadialAxis().setAutoRange(false);
        } 
        else {
            getRadialAxis().setAutoRange(true);
        }
    }
   
    /**
     * Returns the range for the specified axis.
     *
     * @param axis  the axis.
     *
     * @return the range.
     */
    public Range getDataRange(ValueAxis axis) {
        Range result = null;
        result = Range.combine(result, DatasetUtilities.findRangeExtent(this.dataset));
        return result;
    }
   
    /**
     * Receives notification of a change to the plot's m_Dataset.
     * <P>
     * The axis ranges are updated if necessary.
     *
     * @param event  information about the event (not used here).
     */
    public void datasetChanged(DatasetChangeEvent event) {

        if (this.radiusAxis != null) {
            this.radiusAxis.configure();
        }
       
        if (getParent() != null) {
            getParent().datasetChanged(event);
        }
        else {
            PlotChangeEvent e = new PlotChangeEvent(this);
            notifyListeners(e);
        }
    }
   
    /**
     * Notifies all registered listeners of a property change.
     * <P>
     * One source of property change events is the plot's m_Renderer.
     *
     * @param event  information about the property change.
     */
    public void rendererChanged(RendererChangeEvent event) {
        notifyListeners(new PlotChangeEvent(this));
    }
   
    /**
     * Returns the number of series in the dataset for this plot.  If the dataset is
     * <code>null</code>, the method returns 0.
     *
     * @return The series count.
     */
    public int getSeriesCount() {
        int result = 0;
       
        if (this.dataset != null) {
            result = this.dataset.getSeriesCount();
        }
        return result;
    }
   
    /**
     * Returns the legend items for the plot.  Each legend item is generated by the plot's
     * m_Renderer, since the m_Renderer is responsible for the visual representation of the
     * data.
     *
     * @return the legend items.
     */
    public LegendItemCollection getLegendItems() {
        LegendItemCollection result = new LegendItemCollection();
       
        // get the legend items for the main m_Dataset...
        if (this.dataset != null) {
            if (this.renderer != null) {
                int seriesCount = this.dataset.getSeriesCount();
                for (int i = 0; i < seriesCount; i++) {
                    LegendItem item = this.renderer.getLegendItem(i);
                    result.add(item);
                }
            }
        }      
        return result;
    }
   
    /**
     * Tests this plot 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 (super.equals(obj) && obj instanceof PolarPlot) {
            PolarPlot p = (PolarPlot) obj;
            boolean b1 = ObjectUtils.equal(this.radiusAxis, p.radiusAxis);
            boolean b2 = ObjectUtils.equal(this.renderer, p.renderer);
            
            boolean b3 = (this.angleGridlinesVisible == p.angleGridlinesVisible);
            boolean b4 = ObjectUtils.equal(this.angleGridlineStroke, p.angleGridlineStroke);
            boolean b5 = ObjectUtils.equal(this.angleGridlinePaint, p.angleGridlinePaint);
            boolean b6 = (this.radiusGridlinesVisible == p.radiusGridlinesVisible);
            boolean b7 = ObjectUtils.equal(this.radiusGridlineStroke, p.radiusGridlineStroke);
            boolean b8 = ObjectUtils.equal(this.radiusGridlinePaint, p.radiusGridlinePaint);
          
            return b1 && b2 && b3 && b4 && b5 && b6 && b7 && b8;
        }
        return false;
    }
   
    /**
     * Returns a clone of the plot.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException  this can occur if some component of the plot cannot
     *         be cloned.
     */
    public Object clone() throws CloneNotSupportedException {
      
        PolarPlot clone = (PolarPlot) super.clone();

        clone.radiusAxis = (ValueAxis) ObjectUtils.clone(this.radiusAxis);
        if (clone.radiusAxis != null) {
            clone.radiusAxis.setPlot(clone);
            clone.radiusAxis.addChangeListener(clone);
        }
      
        //private PolarDataset m_Dataset <-- just keep the reference, don't clone the m_Dataset
        if (clone.dataset != null) {
            clone.dataset.addChangeListener(clone);
        }
      
        clone.renderer = (PolarItemRenderer) ObjectUtils.clone(this.renderer);
        //private int m_Weight <-- primitive
        //private double anchorX <-- primitive
        //private double anchorY <-- primitive
       
        return 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.writeStroke(this.angleGridlineStroke, stream);
        SerialUtilities.writePaint(this.angleGridlinePaint, stream);
        SerialUtilities.writeStroke(this.radiusGridlineStroke, stream);
        SerialUtilities.writePaint(this.radiusGridlinePaint, 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.angleGridlineStroke = SerialUtilities.readStroke(stream);
        this.angleGridlinePaint = SerialUtilities.readPaint(stream);
        this.radiusGridlineStroke = SerialUtilities.readStroke(stream);
        this.radiusGridlinePaint = SerialUtilities.readPaint(stream);
      
        if (this.radiusAxis != null) {
            this.radiusAxis.setPlot(this);
            this.radiusAxis.addChangeListener(this);
        }
      
        if (this.dataset != null) {
            this.dataset.addChangeListener(this);
        }
    }
   
    // ---------------------------------------
    // --- ValueAxisPlot Interface Methods ---
    // ---------------------------------------
   
    /** 
     * Multiplies the range on the horizontal axis/axes by the specified factor.
     *
     * @param factor  the zoom factor.
     *
     */
    public void zoomHorizontalAxes(double factor) {
        zoom(factor);
    }
   
    /** 
     * Zooms in on the horizontal axes.
     *
     * @param lowerPercent  the new lower bound.
     * @param upperPercent  the new upper bound.
     *
     */
    public void zoomHorizontalAxes(double lowerPercent, double upperPercent) {
        zoom((upperPercent + lowerPercent) / 2.0);
    }
   
    /** 
     * Multiplies the range on the vertical axis/axes by the specified factor.
     *
     * @param factor  the zoom factor.
     */
    public void zoomVerticalAxes(double factor) {
        zoom(factor);
    }
   
    /** 
     * Zooms in on the vertical axes.
     *
     * @param lowerPercent  the new lower bound.
     * @param upperPercent  the new upper bound.
     */
    public void zoomVerticalAxes(double lowerPercent, double upperPercent) {
        zoom((upperPercent + lowerPercent) / 2.0);
    }   
   
    // ----------------------
    // --- Public Methods ---
    // ----------------------

    /**
     * Returns the upper bound of the radius axis.
     * 
     * @return The upper bound.
     */
    public double getMaxRadius() {
        return this.radiusAxis.getUpperBound();
    }

    /**
     * Translates a (theta, radius) pair into Java2D coordinates.
     * 
     * @param angleDegrees  the angle in degrees.
     * @param radius  the radius.
     * @param dataArea  the data area.
     * 
     * @return A point in Java2D space.
     */   
    public Point translateValueThetaRadiusToJava2D(double angleDegrees, 
                                                   double radius,
                                                   Rectangle2D dataArea) {
       
        double radians = Math.toRadians(angleDegrees - 90.0);
        double xv = radius * Math.cos(radians);
        double yv = radius * Math.sin(radians);
      
        double minx = dataArea.getMinX() + MARGIN;
        double maxx = dataArea.getMaxX() - MARGIN;
        double miny = dataArea.getMinY() + MARGIN;
        double maxy = dataArea.getMaxY() - MARGIN;
      
        double lengthX = maxx - minx;
        double lengthY = maxy - miny;
        double length = Math.min(lengthX, lengthY);
      
        double midX = minx + lengthX / 2.0;
        double midY = miny + lengthY / 2.0;
      
        double axisMin = -getMaxRadius();
        double axisMax =  getMaxRadius();
      
        float x = (float) (midX + (xv / (axisMax - axisMin)) * length);
        float y = (float) (midY + (yv / (axisMax - axisMin)) * length);
      
        int ix = Math.round(x);
        int iy = Math.round(y);
      
        Point p = new Point(ix, iy);
        return p;
        
    }
    
}