www.pudn.com > JSystemTrader.zip > MultiColoredBarRenderer.java

package com.jsystemtrader.chart; 
 
import java.awt.*; 
import java.awt.geom.*; 
 
import org.jfree.chart.plot.*; 
import org.jfree.chart.renderer.xy.*; 
import org.jfree.data.xy.*; 
 
/** 
 * Custom renderer for the HighLowChart to paint OHLC bars in different colors. 
 * This functionality is not yet available in JFreeChart, thus the need for a 
 * custom renderer. 
 */ 
class MultiColoredBarRenderer extends HighLowRenderer { 
    private static final Color BULLISH_COLOR = Color.GREEN; 
    private static final Color BEARISH_COLOR = Color.RED; // TWS default is Color(255, 141, 51) 
    private static final Color NEUTRAL_COLOR = Color.YELLOW; 
    private OHLCDataset dataset; 
 
    public MultiColoredBarRenderer() { 
        super(); 
    } 
 
    public Paint getItemPaint(int series, int item) { 
        double open = dataset.getOpenValue(series, item); 
        double close = dataset.getCloseValue(series, item); 
        if (open == close) { 
            return NEUTRAL_COLOR; 
        } else { 
            return (close > open) ? BULLISH_COLOR : BEARISH_COLOR; 
        } 
    } 
 
 
    public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea, XYPlot plot, XYDataset dataset, 
                                          PlotRenderingInfo info) { 
        this.dataset = (OHLCDataset) dataset; 
        return super.initialise(g2, dataArea, plot, dataset, info); 
    } 
}