standardxyitemrenderer.java

jfreechart安装程序和使用说明

     * Sets the flag that controls whether or not a line is plotted between each data point.
     *
     * @param flag  the flag.
     */
    public void setPlotLines(boolean flag) {
        if (this.plotLines != flag) {
            this.plotLines = flag;
            notifyListeners(new RendererChangeEvent(this));
        }
    }

    /**
     * Returns the gap threshold for discontinuous lines.
     *
     * @return the gap threshold.
     */
    public double getGapThreshold() {
        return this.gapThreshold;
    }

    /**
     * Sets the gap threshold for discontinuous lines.
     *
     * @param t  the threshold.
     */
    public void setGapThreshold(double t) {
        this.gapThreshold = t;
        notifyListeners(new RendererChangeEvent(this));
    }

    /**
     * Returns true if images are being plotted by the renderer.
     *
     * @return <code>true</code> if images are being plotted by the renderer.
     */
    public boolean getPlotImages() {
        return this.plotImages;
    }

    /**
     * Sets the flag that controls whether or not an image is drawn at each data point.
     *
     * @param flag  the flag.
     */
    public void setPlotImages(boolean flag) {
        if (this.plotImages != flag) {
            this.plotImages = flag;
            notifyListeners(new RendererChangeEvent(this));
        }
    }

    /**
     * Returns true if lines should be discontinuous.
     *
     * @return <code>true</code> if images are being plotted by the renderer.
     */
    public boolean getPlotDiscontinuous() {
        return this.plotDiscontinuous;
    }

    /**
     * Returns a legend item for a series.
     *
     * @param datasetIndex  the dataset index (zero-based).
     * @param series  the series index (zero-based).
     *
     * @return a legend item for the series.
     */
    public LegendItem getLegendItem(int datasetIndex, int series) {

        LegendItem result = null;

        XYPlot plot = getPlot();
        if (plot != null) {
            XYDataset dataset = plot.getDataset(datasetIndex);

            if (dataset != null) {
                if (getItemVisible(series, 0)) {
                    String label = dataset.getSeriesName(series);
                    String description = label;
                    Shape shape = getSeriesShape(series);
                    boolean shapeFilled = getSeriesShapesFilled(series);
                    Paint paint = getSeriesPaint(series);
                    Paint outlinePaint = getSeriesOutlinePaint(series);
                    Stroke stroke = getSeriesStroke(series);

                    result = new LegendItem(
                        label, description, shape, shapeFilled, paint, stroke, outlinePaint, stroke
                    );
                }
            }

        }

        return result;

    }

    /**
     * Draws the visual representation of a single data item.
     *
     * @param g2  the graphics device.
     * @param state  the renderer state.
     * @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 crosshairState  crosshair information for the plot (<code>null</code> permitted).
     * @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) {

        if (!getItemVisible(series, item)) {
            return;   
        }
        // setup for collecting optional entity info...
        Shape entityArea = null;
        EntityCollection entities = null;
        if (info != null) {
            entities = info.getOwner().getEntityCollection();
        }

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

        // get the data point...
        double x1 = dataset.getXValue(series, item);
        double y1 = dataset.getYValue(series, item);
        if (Double.isNaN(x1) || Double.isNaN(y1)) {
            return;
        }

        RectangleEdge xAxisLocation = plot.getDomainAxisEdge();
        RectangleEdge yAxisLocation = plot.getRangeAxisEdge();
        double transX1 = domainAxis.valueToJava2D(x1, dataArea, xAxisLocation);
        double transY1 = rangeAxis.valueToJava2D(y1, dataArea, yAxisLocation);

        if (getPlotLines()) {

            if (item > 0) {
                // get the previous data point...
                double x0 = dataset.getXValue(series, item - 1);
                double y0 = dataset.getYValue(series, item - 1);
                if (!Double.isNaN(x0) && !Double.isNaN(y0)) {
                    boolean drawLine = true;
                    if (getPlotDiscontinuous()) {
                        // only draw a line if the gap between the current and previous data
                        // point is within the threshold
                        int numX = dataset.getItemCount(series);
                        double minX = dataset.getXValue(series, 0);
                        double maxX = dataset.getXValue(series, numX - 1);
                        drawLine = (x1 - x0) <= ((maxX - minX) / numX * getGapThreshold());
                    }
                    if (drawLine) {
                        double transX0 = domainAxis.valueToJava2D(x0, dataArea, xAxisLocation);
                        double transY0 = rangeAxis.valueToJava2D(y0, dataArea, yAxisLocation);

                        // only draw if we have good values
                        if (Double.isNaN(transX0) || Double.isNaN(transY0) 
                            || Double.isNaN(transX1) || Double.isNaN(transY1)) {
                            return;
                        }

                        if (orientation == PlotOrientation.HORIZONTAL) {
                            state.workingLine.setLine(transY0, transX0, transY1, transX1);
                        }
                        else if (orientation == PlotOrientation.VERTICAL) {
                            state.workingLine.setLine(transX0, transY0, transX1, transY1);
                        }

                        if (state.workingLine.intersects(dataArea)) {
                            g2.draw(state.workingLine);
                        }
                    }
                }
            }
        }

        if (getPlotShapes()) {

            Shape shape = getItemShape(series, item);
            if (orientation == PlotOrientation.HORIZONTAL) {
                shape = createTransformedShape(shape, transY1, transX1);
            }
            else if (orientation == PlotOrientation.VERTICAL) {
                shape = createTransformedShape(shape, transX1, transY1);
            }
            if (shape.intersects(dataArea)) {
                if (getItemShapeFilled(series, item)) {
                    g2.fill(shape);
                }
                else {
                    g2.draw(shape);
                }
            }
            entityArea = shape;

        }

        if (getPlotImages()) {
            // use shape scale with transform??
            //double scale = getShapeScale(plot, series, item, transX1, transY1);
            Image image = getImage(plot, series, item, transX1, transY1);
            if (image != null) {
                Point hotspot = getImageHotspot(plot, series, item, transX1, transY1, image);
                g2.drawImage(
                    image, (int) (transX1 - hotspot.getX()), (int) (transY1 - hotspot.getY()), null
                );
                entityArea = new Rectangle2D.Double(
                    transX1 - hotspot.getX(), transY1 - hotspot.getY(),
                    image.getWidth(null), image.getHeight(null)
                );
            }

        }

        // draw the item label if there is one...
        if (isItemLabelVisible(series, item)) {
            drawItemLabel(
                g2, orientation, dataset, series, item, transX1, transY1, (y1 < 0.0)
            );
        }

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

        // add an entity for the item...
        if (entities != null) {
            addEntity(entities, entityArea, dataset, series, item, transX1, transY1);
        }

    }

    /**
     * Tests this renderer for equality with another object.
     *
     * @param obj  the object (<code>null</code> permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {

        if (obj == this) {
            return true;
        }
        if (!(obj instanceof StandardXYItemRenderer)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        StandardXYItemRenderer that = (StandardXYItemRenderer) obj;
        if (this.plotShapes != that.plotShapes) {
            return false;
        }
        if (this.plotLines != that.plotLines) {
            return false;
        }
        if (this.plotImages != that.plotImages) {
            return false;
        }
        if (this.plotDiscontinuous != that.plotDiscontinuous) {
            return false;
        }
        if (this.gapThreshold != that.gapThreshold) {
            return false;
        }
        if (!ObjectUtils.equal(this.shapesFilled, that.shapesFilled)) {
            return false;
        }
        
        return true;

    }

    ////////////////////////////////////////////////////////////////////////////////////////////////
    // PROTECTED METHODS
    // These provide the opportunity to subclass the standard renderer and create custom effects.
    ////////////////////////////////////////////////////////////////////////////////////////////////

    /**
     * Returns the image used to draw a single data item.
     *
     * @param plot  the plot (can be used to obtain standard color information etc).
     * @param series  the series index.
     * @param item  the item index.
     * @param x  the x value of the item.
     * @param y  the y value of the item.
     *
     * @return The image.
     */
    protected Image getImage(Plot plot, int series, int item, double x, double y) {
        // should this be added to the plot as well ?
        // return plot.getShape(series, item, x, y, scale);
        // or should this be left to the user - like this:
        return null;
    }

    /**
     * Returns the hotspot of the image used to draw a single data item.
     * The hotspot is the point relative to the top left of the image
     * that should indicate the data item. The default is the center of the
     * image.
     *
     * @param plot  the plot (can be used to obtain standard color information etc).
     * @param image  the image (can be used to get size information about the image)
     * @param series  the series index
     * @param item  the item index
     * @param x  the x value of the item
     * @param y  the y value of the item
     *
     * @return The hotspot used to draw the data item.
     */
    protected Point getImageHotspot(Plot plot, int series, int item,
                                    double x, double y, Image image) {

        int height = image.getHeight(null);
        int width = image.getWidth(null);
        return new Point(width / 2, height / 2);

    }

    /**
     * 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();
    }

}