compassplot.java

大家打开看看啊, 很有用的东西

                seriesNeedle[index].setHighlightPaint(Color.white);
                break;
            case 1:
                setSeriesNeedle(index, new LineNeedle());
                break;
            case 2:
                setSeriesNeedle(index, new LongNeedle());
                break;
            case 3:
                setSeriesNeedle(index, new PinNeedle());
                break;
            case 4:
                setSeriesNeedle(index, new PlumNeedle());
                break;
            case 5:
                setSeriesNeedle(index, new PointerNeedle());
                break;
            case 6:
                setSeriesPaint(index, null);
                setSeriesOutlineStroke(index, new BasicStroke(3));
                setSeriesNeedle(index, new ShipNeedle());
                break;
            case 7:
                setSeriesPaint(index, Color.blue);
                setSeriesNeedle(index, new WindNeedle());
                break;
            case 8:
                setSeriesNeedle(index, new ArrowNeedle(true));
                break;
            default:
                String message = "CompassPlot.setSeriesNeedle(...): unrecognised type.";
                throw new IllegalArgumentException(message);
        }
        
    }

    /**
     * Sets the needle for a series.
     *
     * @param index  the series index.
     * @param needle  the needle.
     */
    public void setSeriesNeedle(int index, MeterNeedle needle) {

        if ((needle != null) && (index < seriesNeedle.length)) {
            seriesNeedle[index] = needle;
        }
        notifyListeners(new PlotChangeEvent(this));

    }

    /**
     * Returns the dataset.
     * <P>
     * Provided for convenience.
     *
     * @return    The dataset for the plot, cast as a ValueDataset.
     */
    public ValueDataset[] getData() {
        return this.datasets;
    }

    /**
     * Adds a dataset to the compass.
     *
     * @param data  the new dataset.
     */
    public void addData(ValueDataset data) {
        addData(data, null);
    }

    /**
     * Adds a dataset to the compass.
     *
     * @param data  the new dataset.
     * @param needle  the needle.
     */
    public void addData(ValueDataset data, MeterNeedle needle) {

        if (data != null) {
            int i = datasets.length + 1;
            ValueDataset[] t = new ValueDataset[i];
            MeterNeedle[] p = new MeterNeedle[i];
            i = i - 2;
            for (; i >= 0; --i) {
                t[i] = datasets[i];
                p[i] = seriesNeedle[i];
            }
            i = datasets.length;
            t[i] = data;
            p[i] = ((needle != null) ? needle : p[i - 1]);

            ValueDataset[] a = datasets;
            MeterNeedle[] b = seriesNeedle;
            datasets = t;
            seriesNeedle = p;

            for (--i; i >= 0; --i) {
                a[i] = null;
                b[i] = null;
            }
            data.addChangeListener(this);
        }
    }

    /**
     * Draws the plot on a Java 2D graphics device (such as the screen or a printer).
     *
     * @param g2  the graphics device.
     * @param plotArea  the area within which the plot should be drawn.
     * @param info  collects info about the drawing.
     */
    public void draw(Graphics2D g2, Rectangle2D plotArea, ChartRenderingInfo info) {

        int outerRadius = 0;
        int innerRadius = 0;
        int x1, y1, x2, y2;
        double a;

        if (info != null) {
            info.setPlotArea(plotArea);
        }

        // adjust for insets...
        Insets insets = getInsets();
        if (insets != null) {
            plotArea.setRect(plotArea.getX() + insets.left,
                             plotArea.getY() + insets.top,
                             plotArea.getWidth() - insets.left - insets.right,
                             plotArea.getHeight() - insets.top - insets.bottom);
        }

        // draw the background
        if (drawBorder) {
            drawBackground(g2, plotArea);
        }

        int midX = (int) (plotArea.getWidth() / 2);
        int midY = (int) (plotArea.getHeight() / 2);
        int radius = midX;
        if (midY < midX) {
            radius = midY;
        }
        --radius;
        int diameter = 2 * radius;

        midX += (int) plotArea.getMinX();
        midY += (int) plotArea.getMinY();

        circle1.setFrame(midX - radius, midY - radius, diameter, diameter);
        circle2.setFrame(midX - radius + 15, midY - radius + 15, diameter - 30, diameter - 30);
        g2.setColor(roseColour);
        a1 = new Area(circle1);
        a2 = new Area(circle2);
        a1.subtract(a2);
        g2.fill(a1);

        g2.setColor(roseCenterColour);
        x1 = diameter - 30;
        g2.fillOval(midX - radius + 15, midY - radius + 15, x1, x1);
        g2.setColor(roseHighlightColour);
        g2.drawOval(midX - radius, midY - radius, diameter, diameter);
        x1 = diameter - 20;
        g2.drawOval(midX - radius + 10, midY - radius + 10, x1, x1);
        x1 = diameter - 30;
        g2.drawOval(midX - radius + 15, midY - radius + 15, x1, x1);
        x1 = diameter - 80;
        g2.drawOval(midX - radius + 40, midY - radius + 40, x1, x1);

        outerRadius = radius - 20;
        innerRadius = radius - 32;
        for (int w = 0; w < 360; w += 15) {
            a = Math.toRadians(w);
            x1 = midX - ((int) (Math.sin(a) * innerRadius));
            x2 = midX - ((int) (Math.sin(a) * outerRadius));
            y1 = midY - ((int) (Math.cos(a) * innerRadius));
            y2 = midY - ((int) (Math.cos(a) * outerRadius));
            g2.drawLine(x1, y1, x2, y2);
        }

        g2.setColor(roseHighlightColour);
        innerRadius = radius - 26;
        outerRadius = 7;
        for (int w = 45; w < 360; w += 90) {
            a = Math.toRadians(w);
            x1 = midX - ((int) (Math.sin(a) * innerRadius));
            y1 = midY - ((int) (Math.cos(a) * innerRadius));
            g2.fillOval(x1 - outerRadius, y1 - outerRadius, 2 * outerRadius, 2 * outerRadius);
        }

        /// Squares
        for (int w = 0; w < 360; w += 90) {
            a = Math.toRadians(w);
            x1 = midX - ((int) (Math.sin(a) * innerRadius));
            y1 = midY - ((int) (Math.cos(a) * innerRadius));

            Polygon p = new Polygon();
            p.addPoint(x1 - outerRadius, y1);
            p.addPoint(x1, y1 + outerRadius);
            p.addPoint(x1 + outerRadius, y1);
            p.addPoint(x1, y1 - outerRadius);
            g2.fillPolygon(p);
        }

        /// Draw N, S, E, W
        innerRadius = radius - 42;
        Font f = getCompassFont(radius);
        g2.setFont(f);
        g2.drawString("N", midX - 5, midY - innerRadius + f.getSize());
        g2.drawString("S", midX - 5, midY + innerRadius - 5);
        g2.drawString("W", midX - innerRadius + 5, midY + 5);
        g2.drawString("E", midX + innerRadius - f.getSize(), midY + 5);

        // plot the data (unless the dataset is null)...
        y1 = radius / 2;
        x1 = radius / 6;
        Rectangle2D needleArea = new Rectangle2D.Double((midX - x1), (midY - y1),
                                                        (2 * x1), (2 * y1));
        int x = seriesNeedle.length;
        int current = 0;
        double value = 0;
        int i = (datasets.length - 1);
        for (; i >= 0; --i) {
            ValueDataset data = datasets[i];

            if (data != null) {
                value = (data.getValue().doubleValue()) % 360;
                current = i % x;
                seriesNeedle[current].draw(g2, needleArea, value);
            }
        }

        if (drawBorder) {
            drawOutline(g2, plotArea);
        }

    }

    /**
     * Returns a short string describing the type of plot.
     *
     * @return a string describing the plot.
     */
    public String getPlotType() {
        return "Compass Plot";
    }

    /**
     * Returns the legend items for the plot.  For now, no legend is available - this method
     * returns null.
     *
     * @return the legend items.
     */
    public LegendItemCollection getLegendItems() {
        return null;
    }

    /**
     * No zooming is implemented for compass plot, so this method is empty.
     *
     * @param percent  the zoom amount.
     */
    public void zoom(double percent) {
    }

    /**
     * Returns the font for the compass.
     *
     * @param radius the radius.
     *
     * @return the font.
     */
    protected Font getCompassFont(int radius) {

        float fontSize = radius / 10;
        if (fontSize < 8) {
            fontSize = 8;
        }

        Font newFont = compassFont.deriveFont(fontSize);
        return newFont;

    }

    /**
     * Returns a list of legend item labels.
     *
     * @return a list of legend item labels.
     *
     * @deprecated use getLegendItems().
     */
    public java.util.List getLegendItemLabels() {
        return null;
    }

}