areaxyrenderer.java

大家打开看看啊, 很有用的东西

    /**
     * Returns true if Area is being plotted by the renderer.
     *
     * @return  <code>true</code> if Area is being plotted by the renderer.
     */
    public boolean getPlotArea() {
        return this.plotArea;
    }

    /**
<<<<<<< AreaXYRenderer.java
     * Initialises the renderer.  Here we calculate the Java2D y-coordinate for
     * zero, since all the bars have their bases fixed at zero.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area inside the axes.
     * @param plot  the plot.
     * @param data  the data.
     * @param info  an optional info collection object to return data back to the caller.
     *
     * @return The number of passes required by the renderer.
     */
    public int initialise(Graphics2D g2,
                          Rectangle2D dataArea,
                          XYPlot plot,
                          XYDataset data,
                          ChartRenderingInfo info) {

        super.initialise(g2, dataArea, plot, data, info);
        return 1;

    }

    /**
     * Draws the visual representation of a single data item.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area within which the data is being drawn.
     * @param info  collects information about the drawing.
     * @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 crosshairInfo  information about crosshairs on a plot.
     * @param pass  the pass index.
     */
    public void drawItem(Graphics2D g2,
                         Rectangle2D dataArea,
                         ChartRenderingInfo info,
                         XYPlot plot,
                         ValueAxis domainAxis,
                         ValueAxis rangeAxis,
                         XYDataset dataset,
                         int series,
                         int item,
                         CrosshairInfo crosshairInfo,
                         int pass) {

        // Get the item count for the series, so that we can know which is the end of the series.
        int itemCount = dataset.getItemCount(series);

        Paint paint = getItemPaint(series, item);
        Stroke seriesStroke = getItemStroke(series, item);
        g2.setPaint(paint);
        g2.setStroke(seriesStroke);

        // get the data point...
        Number x1 = dataset.getXValue(series, item);
        Number y1 = dataset.getYValue(series, item);
        double transX1 = domainAxis.translateValueToJava2D(x1.doubleValue(), dataArea, 
                                                           plot.getDomainAxisEdge());
        double transY1 = rangeAxis.translateValueToJava2D(y1.doubleValue(), dataArea, 
                                                          plot.getRangeAxisEdge());

        if (item == 0) {
            // Create a new Area for the series
            pArea = new Polygon();

            // start from Y = 0
            double transY2 = rangeAxis.translateValueToJava2D(0.0, dataArea, 
                                                              plot.getRangeAxisEdge());

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

        // Add each point to Area (x, y)
        if (plot.getOrientation() == PlotOrientation.VERTICAL) {
            pArea.addPoint((int) transX1, (int) transY1);
        }
        else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
            pArea.addPoint((int) transY1, (int) transX1);
        }
        Shape shape = null;
        if (this.plotShapes) {
            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);
            }
            g2.draw(shape);
        }
        else {
            if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                shape = new Rectangle2D.Double(transX1 - 2, transY1 - 2, 4.0, 4.0);
            }
            else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                shape = new Rectangle2D.Double(transY1 - 2, transX1 - 2, 4.0, 4.0);
            }
        }

        if (this.plotLines) {
            if (item > 0) {
                // get the previous data point...
                Number x0 = dataset.getXValue(series, item - 1);
                Number y0 = dataset.getYValue(series, item - 1);
                double transX0 = domainAxis.translateValueToJava2D(x0.doubleValue(), dataArea, 
                                                                   plot.getDomainAxisEdge());
                double transY0 = rangeAxis.translateValueToJava2D(y0.doubleValue(), dataArea, 
                                                                  plot.getRangeAxisEdge());

                if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                    line.setLine(transX0, transY0, transX1, transY1);
                }
                else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                    line.setLine(transY0, transX0, transY1, transX1);
                }
                g2.draw(line);
            }
        }

        // 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.plotArea && item > 0 && item == (itemCount - 1)) {

            double transY2 = rangeAxis.translateValueToJava2D(0.0, dataArea, 
                                                              plot.getRangeAxisEdge());

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

            // fill the polygon
            g2.fill(pArea);

            // draw an outline around the Area.
            if (showOutline) {
                g2.setStroke(plot.getOutlineStroke());
                g2.setPaint(plot.getOutlinePaint());
                g2.draw(pArea);
            }
        }

        // do we need to update the crosshair values?
        if (plot.isDomainCrosshairLockedOnData()) {
            if (plot.isRangeCrosshairLockedOnData()) {
                // both axes
                crosshairInfo.updateCrosshairPoint(x1.doubleValue(), y1.doubleValue());
            }
            else {
                // just the horizontal axis...
                crosshairInfo.updateCrosshairX(x1.doubleValue());

            }
        }
        else {
            if (plot.isRangeCrosshairLockedOnData()) {
                // just the vertical axis...
                crosshairInfo.updateCrosshairY(y1.doubleValue());
            }
        }

        // collect entity and tool tip information...
        if (getInfo() != null) {
            EntityCollection entities = getInfo().getEntityCollection();
            if (entities != null && shape != null) {
                String tip = null;
                if (getToolTipGenerator() != null) {
                    tip = getToolTipGenerator().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);
            }
        }

    }

}