polarplot.java

jfreechart-1.0.12.zip 可以用来作图

    /**
     * Sets the flag that controls whether or not the angle labels are visible,
     * and sends a {@link PlotChangeEvent} to all registered listeners.
     *
     * @param visible  the flag.
     *
     * @see #isAngleLabelsVisible()
     */
    public void setAngleLabelsVisible(boolean visible) {
        if (this.angleLabelsVisible != visible) {
            this.angleLabelsVisible = visible;
            fireChangeEvent();
        }
    }

    /**
     * Returns the font used to display the angle labels.
     *
     * @return A font (never <code>null</code>).
     *
     * @see #setAngleLabelFont(Font)
     */
    public Font getAngleLabelFont() {
        return this.angleLabelFont;
    }

    /**
     * Sets the font used to display the angle labels and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param font  the font (<code>null</code> not permitted).
     *
     * @see #getAngleLabelFont()
     */
    public void setAngleLabelFont(Font font) {
        if (font == null) {
            throw new IllegalArgumentException("Null 'font' argument.");
        }
        this.angleLabelFont = font;
        fireChangeEvent();
    }

    /**
     * Returns the paint used to display the angle labels.
     *
     * @return A paint (never <code>null</code>).
     *
     * @see #setAngleLabelPaint(Paint)
     */
    public Paint getAngleLabelPaint() {
        return this.angleLabelPaint;
    }

    /**
     * Sets the paint used to display the angle labels and sends a
     * {@link PlotChangeEvent} to all registered listeners.
     *
     * @param paint  the paint (<code>null</code> not permitted).
     */
    public void setAngleLabelPaint(Paint paint) {
        if (paint == null) {
            throw new IllegalArgumentException("Null 'paint' argument.");
        }
        this.angleLabelPaint = paint;
        fireChangeEvent();
    }

    /**
     * Returns <code>true</code> if the angular gridlines are visible, and
     * <code>false<code> otherwise.
     *
     * @return <code>true</code> or <code>false</code>.
     *
     * @see #setAngleGridlinesVisible(boolean)
     */
    public boolean isAngleGridlinesVisible() {
        return this.angleGridlinesVisible;
    }

    /**
     * Sets the flag that controls whether or not the angular grid-lines are
     * visible.
     * <p>
     * If the flag value is changed, a {@link PlotChangeEvent} is sent to all
     * registered listeners.
     *
     * @param visible  the new value of the flag.
     *
     * @see #isAngleGridlinesVisible()
     */
    public void setAngleGridlinesVisible(boolean visible) {
        if (this.angleGridlinesVisible != visible) {
            this.angleGridlinesVisible = visible;
            fireChangeEvent();
        }
    }

    /**
     * Returns the stroke for the grid-lines (if any) plotted against the
     * angular axis.
     *
     * @return The stroke (possibly <code>null</code>).
     *
     * @see #setAngleGridlineStroke(Stroke)
     */
    public Stroke getAngleGridlineStroke() {
        return this.angleGridlineStroke;
    }

    /**
     * Sets the stroke for the grid lines plotted against the angular axis and
     * sends a {@link PlotChangeEvent} to all registered listeners.
     * <p>
     * If you set this to <code>null</code>, no grid lines will be drawn.
     *
     * @param stroke  the stroke (<code>null</code> permitted).
     *
     * @see #getAngleGridlineStroke()
     */
    public void setAngleGridlineStroke(Stroke stroke) {
        this.angleGridlineStroke = stroke;
        fireChangeEvent();
    }

    /**
     * Returns the paint for the grid lines (if any) plotted against the
     * angular axis.
     *
     * @return The paint (possibly <code>null</code>).
     *
     * @see #setAngleGridlinePaint(Paint)
     */
    public Paint getAngleGridlinePaint() {
        return this.angleGridlinePaint;
    }

    /**
     * Sets the paint for the grid lines plotted against the angular axis.
     * <p>
     * If you set this to <code>null</code>, no grid lines will be drawn.
     *
     * @param paint  the paint (<code>null</code> permitted).
     *
     * @see #getAngleGridlinePaint()
     */
    public void setAngleGridlinePaint(Paint paint) {
        this.angleGridlinePaint = paint;
        fireChangeEvent();
    }

    /**
     * Returns <code>true</code> if the radius axis grid is visible, and
     * <code>false<code> otherwise.
     *
     * @return <code>true</code> or <code>false</code>.
     *
     * @see #setRadiusGridlinesVisible(boolean)
     */
    public boolean isRadiusGridlinesVisible() {
        return this.radiusGridlinesVisible;
    }

    /**
     * Sets the flag that controls whether or not the radius axis grid lines
     * are visible.
     * <p>
     * If the flag value is changed, a {@link PlotChangeEvent} is sent to all
     * registered listeners.
     *
     * @param visible  the new value of the flag.
     *
     * @see #isRadiusGridlinesVisible()
     */
    public void setRadiusGridlinesVisible(boolean visible) {
        if (this.radiusGridlinesVisible != visible) {
            this.radiusGridlinesVisible = visible;
            fireChangeEvent();
        }
    }

    /**
     * Returns the stroke for the grid lines (if any) plotted against the
     * radius axis.
     *
     * @return The stroke (possibly <code>null</code>).
     *
     * @see #setRadiusGridlineStroke(Stroke)
     */
    public Stroke getRadiusGridlineStroke() {
        return this.radiusGridlineStroke;
    }

    /**
     * Sets the stroke for the grid lines plotted against the radius axis and
     * sends a {@link PlotChangeEvent} to all registered listeners.
     * <p>
     * If you set this to <code>null</code>, no grid lines will be drawn.
     *
     * @param stroke  the stroke (<code>null</code> permitted).
     *
     * @see #getRadiusGridlineStroke()
     */
    public void setRadiusGridlineStroke(Stroke stroke) {
        this.radiusGridlineStroke = stroke;
        fireChangeEvent();
    }

    /**
     * Returns the paint for the grid lines (if any) plotted against the radius
     * axis.
     *
     * @return The paint (possibly <code>null</code>).
     *
     * @see #setRadiusGridlinePaint(Paint)
     */
    public Paint getRadiusGridlinePaint() {
        return this.radiusGridlinePaint;
    }

    /**
     * Sets the paint for the grid lines plotted against the radius axis and
     * sends a {@link PlotChangeEvent} to all registered listeners.
     * <p>
     * If you set this to <code>null</code>, no grid lines will be drawn.
     *
     * @param paint  the paint (<code>null</code> permitted).
     *
     * @see #getRadiusGridlinePaint()
     */
    public void setRadiusGridlinePaint(Paint paint) {
        this.radiusGridlinePaint = paint;
        fireChangeEvent();
    }

    /**
     * Generates a list of tick values for the angular tick marks.
     *
     * @return A list of {@link NumberTick} instances.
     *
     * @since 1.0.10
     */
    protected List refreshAngleTicks() {
        List ticks = new ArrayList();
        for (double currentTickVal = 0.0; currentTickVal < 360.0;
                currentTickVal += this.angleTickUnit.getSize()) {
            NumberTick tick = new NumberTick(new Double(currentTickVal),
                this.angleTickUnit.valueToString(currentTickVal),
                TextAnchor.CENTER, TextAnchor.CENTER, 0.0);
            ticks.add(tick);
        }
        return ticks;
    }

    /**
     * Draws the plot on a Java 2D graphics device (such as the screen or a
     * printer).
     * <P>
     * This plot relies on a {@link PolarItemRenderer} to draw each
     * item in the plot.  This allows the visual representation of the data to
     * be changed easily.
     * <P>
     * The optional info argument collects information about the rendering of
     * the plot (dimensions, tooltip information etc).  Just pass in
     * <code>null</code> if you do not need this information.
     *
     * @param g2  the graphics device.
     * @param area  the area within which the plot (including axes and
     *              labels) should be drawn.
     * @param anchor  the anchor point (<code>null</code> permitted).
     * @param parentState  ignored.
     * @param info  collects chart drawing information (<code>null</code>
     *              permitted).
     */
    public void draw(Graphics2D g2,
                     Rectangle2D area,
                     Point2D anchor,
                     PlotState parentState,
                     PlotRenderingInfo info) {

        // if the plot area is too small, just return...
        boolean b1 = (area.getWidth() <= MINIMUM_WIDTH_TO_DRAW);
        boolean b2 = (area.getHeight() <= MINIMUM_HEIGHT_TO_DRAW);
        if (b1 || b2) {
            return;
        }

        // record the plot area...
        if (info != null) {
            info.setPlotArea(area);
        }

        // adjust the drawing area for the plot insets (if any)...
        RectangleInsets insets = getInsets();
        insets.trim(area);

        Rectangle2D dataArea = area;
        if (info != null) {
            info.setDataArea(dataArea);
        }

        // draw the plot background and axes...
        drawBackground(g2, dataArea);
        double h = Math.min(dataArea.getWidth() / 2.0,
                dataArea.getHeight() / 2.0) - MARGIN;
        Rectangle2D quadrant = new Rectangle2D.Double(dataArea.getCenterX(),
                dataArea.getCenterY(), h, h);
        AxisState state = drawAxis(g2, area, quadrant);
        if (this.renderer != null) {
            Shape originalClip = g2.getClip();
            Composite originalComposite = g2.getComposite();

            g2.clip(dataArea);
            g2.setComposite(AlphaComposite.getInstance(
                    AlphaComposite.SRC_OVER, getForegroundAlpha()));

            this.angleTicks = refreshAngleTicks();
            drawGridlines(g2, dataArea, this.angleTicks, state.getTicks());

            // draw...
            render(g2, dataArea, info);

            g2.setClip(originalClip);
            g2.setComposite(originalComposite);
        }
        drawOutline(g2, dataArea);
        drawCornerTextItems(g2, dataArea);
    }

    /**
     * Draws the corner text items.
     *
     * @param g2  the drawing surface.
     * @param area  the area.
     */
    protected void drawCornerTextItems(Graphics2D g2, Rectangle2D area) {
        if (this.cornerTextItems.isEmpty()) {
            return;
        }

        g2.setColor(Color.black);
        double width = 0.0;
        double height = 0.0;
        for (Iterator it = this.cornerTextItems.iterator(); it.hasNext();) {
            String msg = (String) it.next();
            FontMetrics fm = g2.getFontMetrics();
            Rectangle2D bounds = TextUtilities.getTextBounds(msg, g2, fm);
            width = Math.max(width, bounds.getWidth());
            height += bounds.getHeight();
        }

        double xadj = ANNOTATION_MARGIN * 2.0;
        double yadj = ANNOTATION_MARGIN;
        width += xadj;
        height += yadj;

        double x = area.getMaxX() - width;
        double y = area.getMaxY() - height;
        g2.drawRect((int) x, (int) y, (int) width, (int) height);
        x += ANNOTATION_MARGIN;
        for (Iterator it = this.cornerTextItems.iterator(); it.hasNext();) {
            String msg = (String) it.next();
            Rectangle2D bounds = TextUtilities.getTextBounds(msg, g2,
                    g2.getFontMetrics());
            y += bounds.getHeight();
            g2.drawString(msg, (int) x, (int) y);
        }
    }

    /**
     * A utility method for drawing the axes.
     *
     * @param g2  the graphics device.
     * @param plotArea  the plot area.
     * @param dataArea  the data area.
     *
     * @return A map containing the axis states.
     */
    protected AxisState drawAxis(Graphics2D g2, Rectangle2D plotArea,
                                 Rectangle2D dataArea) {
        return this.axis.draw(g2, dataArea.getMinY(), plotArea, dataArea,
                RectangleEdge.TOP, null);
    }

    /**
     * Draws a representation of the data within the dataArea region, using the
     * current m_Renderer.
     *
     * @param g2  the graphics device.
     * @param dataArea  the region in which the data is to be drawn.
     * @param info  an optional object for collection dimension
     *              information (<code>null</code> permitted).
     */
    protected void render(Graphics2D g2,
                       Rectangle2D dataArea,
                       PlotRenderingInfo info) {

        // now get the data and plot it (the visual representation will depend
        // on the m_Renderer that has been set)...
        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);
            }
        }