stackedxyarearenderer.java

这是一个segy数据显示程序

     * @param plot  the plot (can be used to obtain standard color information etc).
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the dataset.
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     * @param crosshairState  information about crosshairs on a plot.
     * @param pass  the pass index.
     */
    public void drawItem(Graphics2D g2,
                         XYItemRendererState state,
                         Rectangle2D dataArea,
                         PlotRenderingInfo info,
                         XYPlot plot,
                         ValueAxis domainAxis,
                         ValueAxis rangeAxis,
                         XYDataset dataset,
                         int series,
                         int item,
                         CrosshairState crosshairState,
                         int pass) {

        PlotOrientation orientation = plot.getOrientation();
        StackedXYAreaRendererState areaState = (StackedXYAreaRendererState) state;
        // Get the item count for the series, so that we can know which is the end of the series.
        TableXYDataset tableXYDataset = (TableXYDataset) dataset;
        int itemCount = tableXYDataset.getItemCount();

        // get the data point...
        Number x1 = dataset.getXValue(series, item);
        Number y1 = dataset.getYValue(series, item);
        boolean nullPoint = false;
        if (y1 == null) {
            y1 = new Double(0);
            nullPoint = true;
        }

        //  Get height adjustment based on stack and translate to Java2D values
        double ph1 = this.getPreviousHeight(dataset, series, item);
        double transX1 = domainAxis.valueToJava2D(
            x1.doubleValue(), dataArea, plot.getDomainAxisEdge()
        );
        double transY1 = rangeAxis.valueToJava2D(
            y1.doubleValue() + ph1, dataArea, plot.getRangeAxisEdge()
        );

        //  Get series Paint and Stroke
        Paint seriesPaint = getItemPaint(series, item);
        Stroke seriesStroke = getItemStroke(series, item);

        if (pass == 0) {
            //  On first pass renderer the areas, line and outlines

            if (item == 0) {
                // Create a new Area for the series
                areaState.setSeriesArea(new Polygon());
                areaState.setLastSeriesPoints(areaState.getCurrentSeriesPoints());
                areaState.setCurrentSeriesPoints(new Stack());

                // start from previous height (ph1)
                double transY2 = rangeAxis.valueToJava2D(ph1, dataArea, plot.getRangeAxisEdge());

                // The first point is (x, 0)
                if (orientation == PlotOrientation.VERTICAL) {
                    areaState.getSeriesArea().addPoint((int) transX1, (int) transY2);
                } 
                else if (orientation == PlotOrientation.HORIZONTAL) {
                    areaState.getSeriesArea().addPoint((int) transY2, (int) transX1);
                }
            }

            // Add each point to Area (x, y)
            if (orientation == PlotOrientation.VERTICAL) {
                Point point = new Point((int) transX1, (int) transY1);
                areaState.getSeriesArea().addPoint((int) point.getX(), (int) point.getY());
                areaState.getCurrentSeriesPoints().push(point);
            }
            else if (orientation == PlotOrientation.HORIZONTAL) {
                areaState.getSeriesArea().addPoint((int) transY1, (int) transX1);
            }

            if (this.getPlotLines()) {
                if (item > 0) {
                    // get the previous data point...
                    Number x0 = dataset.getXValue(series, item - 1);
                    Number y0 = dataset.getYValue(series, item - 1);
                    double ph0 = this.getPreviousHeight(dataset, series, item - 1);
                    double transX0 = domainAxis.valueToJava2D(
                        x0.doubleValue(), dataArea, plot.getDomainAxisEdge()
                    );
                    double transY0 = rangeAxis.valueToJava2D(
                        y0.doubleValue() + ph0, dataArea, plot.getRangeAxisEdge()
                    );

                    if (orientation == PlotOrientation.VERTICAL) {
                        areaState.getLine().setLine(transX0, transY0, transX1, transY1);
                    }
                    else if (orientation == PlotOrientation.HORIZONTAL) {
                        areaState.getLine().setLine(transY0, transX0, transY1, transX1);
                    }
                    g2.draw(areaState.getLine());
                }
            }

            // Check if the item is the last item for the series.
            // and number of items > 0.  We can't draw an area for a single point.
            if (this.getPlotArea() && item > 0 && item == (itemCount - 1)) {

                double transY2 = rangeAxis.valueToJava2D(ph1, dataArea, plot.getRangeAxisEdge());

                if (orientation == PlotOrientation.VERTICAL) {
                    // Add the last point (x,0)
                    areaState.getSeriesArea().addPoint((int) transX1, (int) transY2);
                }
                else if (orientation == PlotOrientation.HORIZONTAL) {
                    // Add the last point (x,0)
                    areaState.getSeriesArea().addPoint((int) transY2, (int) transX1);
                }

                //  Add points from last series to complete the base of the polygon
                if (series != 0) {
                    Stack points = areaState.getLastSeriesPoints();
                    while (!points.empty()) {
                        Point point = (Point) points.pop();
                        areaState.getSeriesArea().addPoint((int) point.getX(), (int) point.getY());
                    }
                }

                //  Fill the polygon
                g2.setPaint(seriesPaint);
                g2.setStroke(seriesStroke);
                g2.fill(areaState.getSeriesArea());

                //  Draw an outline around the Area.
                if (this.isOutline()) {
                    g2.setStroke(plot.getOutlineStroke());
                    g2.setPaint(plot.getOutlinePaint());
                    g2.draw(areaState.getSeriesArea());
                }
            }

            updateCrosshairValues(
                crosshairState, x1.doubleValue(), y1.doubleValue(), transX1, transY1, orientation
            );

        } 
        else if (pass == 1) {
            //  On second pass render shapes and collect entity and tooltip information

            Shape shape = null;
            if (this.getPlotShapes()) {
                shape = getItemShape(series, item);
                if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                    shape = createTransformedShape(shape, transX1, transY1);
                } 
                else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                    shape = createTransformedShape(shape, transY1, transX1);
                }
                if (!nullPoint) {
                    if (getShapePaint() != null) {
                        g2.setPaint(getShapePaint());
                    } 
                    else {
                        g2.setPaint(seriesPaint);
                    }
                    if (getShapeStroke() != null) {
                        g2.setStroke(getShapeStroke());
                    } 
                    else {
                        g2.setStroke(seriesStroke);
                    }
                    g2.draw(shape);
                }
            } 
            else {
                if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                    shape = new Rectangle2D.Double(transX1 - 3, transY1 - 3, 6.0, 6.0);
                } 
                else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                    shape = new Rectangle2D.Double(transY1 - 3, transX1 - 3, 6.0, 6.0);
                }
            }

            // collect entity and tool tip information...
            if (state.getInfo() != null) {
                EntityCollection entities = state.getInfo().getOwner().getEntityCollection();
                if (entities != null && shape != null && !nullPoint) {
                    String tip = null;
                    XYToolTipGenerator generator = getToolTipGenerator(series, item);
                    if (generator != null) {
                        tip = generator.generateToolTip(dataset, series, item);
                    }
                    String url = null;
                    if (getURLGenerator() != null) {
                        url = getURLGenerator().generateURL(dataset, series, item);
                    }
                    XYItemEntity entity = new XYItemEntity(shape, dataset, series, item, tip, url);
                    entities.addEntity(entity);
                }
            }

        }
    }

    /**
     * Calculates the stacked value of the all series up to, but not including <code>series</code>
     * for the specified category, <code>category</code>.  It returns 0.0 if <code>series</code>
     * is the first series, i.e. 0.
     *
     * @param data  the data.
     * @param series  the series.
     * @param index  the index.
     *
     * @return double returns a cumulative value for all series' values up to
     * but excluding <code>series</code> for <code>index</code>.
     */
    protected double getPreviousHeight(XYDataset data, int series, int index) {

        double result = 0.0;

        Number tmp;
        for (int i = 0; i < series; i++) {
            tmp = data.getYValue(i, index);
            if (tmp != null) {
                result += tmp.doubleValue();
            }
        }

        return result;

    }

    /**
     * Returns a clone of the renderer.
     *
     * @return A clone.
     *
     * @throws CloneNotSupportedException  if the renderer cannot be cloned.
     */
    public Object clone() throws CloneNotSupportedException {
        return super.clone();
    }

    /**
     * Returns the Paint used for rendering shapes, or null if using series Paints
     *
     * @return The Paint.
     */
    public Paint getShapePaint() {
        return this.shapePaint;
    }

    /**
     * Returns the Stroke used for rendering shapes, or null if using series Strokes.
     *
     * @return The Stroke.
     */
    public Stroke getShapeStroke() {
        return this.shapeStroke;
    }

    /**
     * Sets the Paint for rendering shapes.
     *
     * @param shapePaint The Paint.
     */
    public void setShapePaint(Paint shapePaint) {
        this.shapePaint = shapePaint;
    }

    /**
     * Sets the Stroke for rendering shapes.
     *
     * @param shapeStroke The Stroke.
     */
    public void setShapeStroke(Stroke shapeStroke) {
        this.shapeStroke = shapeStroke;
    }

}