highlowrenderer.java

制作图表的好工具

     * @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) {

        // first make sure we have a valid x value...
        Number x = dataset.getX(series, item);
        if (x == null) {  
            return;    // if x is null, we can't do anything
        }
        double xdouble = x.doubleValue();
        if (!domainAxis.getRange().contains(xdouble)) {
            return;    // the x value is not within the axis range
        }
        double xx = domainAxis.valueToJava2D(xdouble, dataArea, 
                plot.getDomainAxisEdge());
        
        // setup for collecting optional entity info...
        Shape entityArea = null;
        EntityCollection entities = null;
        if (info != null) {
            entities = info.getOwner().getEntityCollection();
        }

        PlotOrientation orientation = plot.getOrientation();
        RectangleEdge location = plot.getRangeAxisEdge();

        Paint itemPaint = getItemPaint(series, item);
        Stroke itemStroke = getItemStroke(series, item);
        g2.setPaint(itemPaint);
        g2.setStroke(itemStroke);
        
        if (dataset instanceof OHLCDataset) {
            OHLCDataset hld = (OHLCDataset) dataset;
            
            double yHigh = hld.getHighValue(series, item);
            double yLow = hld.getLowValue(series, item);
            if (!Double.isNaN(yHigh) && !Double.isNaN(yLow)) {
                double yyHigh = rangeAxis.valueToJava2D(yHigh, dataArea, 
                        location);
                double yyLow = rangeAxis.valueToJava2D(yLow, dataArea, 
                        location);
                if (orientation == PlotOrientation.HORIZONTAL) {
                    g2.draw(new Line2D.Double(yyLow, xx, yyHigh, xx));
                    entityArea = new Rectangle2D.Double(Math.min(yyLow, yyHigh),
                            xx - 1.0, Math.abs(yyHigh - yyLow), 2.0);
                }
                else if (orientation == PlotOrientation.VERTICAL) {
                    g2.draw(new Line2D.Double(xx, yyLow, xx, yyHigh));   
                    entityArea = new Rectangle2D.Double(xx - 1.0, 
                            Math.min(yyLow, yyHigh), 2.0,  
                            Math.abs(yyHigh - yyLow));
                }
            }
            
            double delta = 2.0;
            if (domainAxis.isInverted()) {
                delta = -delta;
            }
            if (getDrawOpenTicks()) {
                double yOpen = hld.getOpenValue(series, item);
                if (!Double.isNaN(yOpen)) {
                    double yyOpen = rangeAxis.valueToJava2D(yOpen, dataArea, 
                            location);
                    if (this.openTickPaint != null) {
                        g2.setPaint(this.openTickPaint);
                    }
                    else {
                        g2.setPaint(itemPaint);
                    }
                    if (orientation == PlotOrientation.HORIZONTAL) {
                        g2.draw(new Line2D.Double(yyOpen, xx + delta, yyOpen, 
                                xx));   
                    }
                    else if (orientation == PlotOrientation.VERTICAL) {
                        g2.draw(new Line2D.Double(xx - delta, yyOpen, xx, 
                                yyOpen));   
                    }
                }
            }
            
            if (getDrawCloseTicks()) {
                double yClose = hld.getCloseValue(series, item);
                if (!Double.isNaN(yClose)) {
                    double yyClose = rangeAxis.valueToJava2D(
                        yClose, dataArea, location);
                    if (this.closeTickPaint != null) {
                        g2.setPaint(this.closeTickPaint);
                    }
                    else {
                        g2.setPaint(itemPaint);
                    }
                    if (orientation == PlotOrientation.HORIZONTAL) {
                        g2.draw(new Line2D.Double(yyClose, xx, yyClose, 
                                xx - delta));   
                    }
                    else if (orientation == PlotOrientation.VERTICAL) {
                        g2.draw(new Line2D.Double(xx, yyClose, xx + delta, 
                                yyClose));   
                    }
                }
            }
  
        }
        else {
            // not a HighLowDataset, so just draw a line connecting this point 
            // with the previous point...
            if (item > 0) {
                Number x0 = dataset.getX(series, item - 1);
                Number y0 = dataset.getY(series, item - 1);
                Number y = dataset.getY(series, item);
                if (x0 == null || y0 == null || y == null) {
                    return;
                }
                double xx0 = domainAxis.valueToJava2D(x0.doubleValue(), 
                        dataArea, plot.getDomainAxisEdge());
                double yy0 = rangeAxis.valueToJava2D(y0.doubleValue(), 
                        dataArea, location);
                double yy = rangeAxis.valueToJava2D(y.doubleValue(), dataArea, 
                        location);
                if (orientation == PlotOrientation.HORIZONTAL) {
                    g2.draw(new Line2D.Double(yy0, xx0, yy, xx));
                }
                else if (orientation == PlotOrientation.VERTICAL) {
                    g2.draw(new Line2D.Double(xx0, yy0, xx, yy));
                }
            }
        }
        
        // add an entity for the item...
        if (entities != null) {
            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(entityArea, dataset, 
                    series, item, tip, url);
            entities.add(entity);
        }

    }
    
    /**
     * 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();
    }
    
    /**
     * Tests this renderer for equality with an arbitrary object.
     * 
     * @param obj  the object (<code>null</code> permitted).
     * 
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof HighLowRenderer)) {
            return false;
        }
        HighLowRenderer that = (HighLowRenderer) obj;
        if (this.drawOpenTicks != that.drawOpenTicks) {
            return false;
        }
        if (this.drawCloseTicks != that.drawCloseTicks) {
            return false;
        }
        if (!PaintUtilities.equal(this.openTickPaint, that.openTickPaint)) {
            return false;
        }
        if (!PaintUtilities.equal(this.closeTickPaint, that.closeTickPaint)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        return true;
    }
    
    /**
     * Provides serialization support.
     *
     * @param stream  the input stream.
     *
     * @throws IOException  if there is an I/O error.
     * @throws ClassNotFoundException  if there is a classpath problem.
     */
    private void readObject(ObjectInputStream stream) 
            throws IOException, ClassNotFoundException {
        stream.defaultReadObject();
        this.openTickPaint = SerialUtilities.readPaint(stream);
        this.closeTickPaint = SerialUtilities.readPaint(stream);
    }
    
    /**
     * Provides serialization support.
     *
     * @param stream  the output stream.
     *
     * @throws IOException  if there is an I/O error.
     */
    private void writeObject(ObjectOutputStream stream) throws IOException {
        stream.defaultWriteObject();
        SerialUtilities.writePaint(this.openTickPaint, stream);
        SerialUtilities.writePaint(this.closeTickPaint, stream);
    }

}