java - 是否可以在 Candlestick jfreechart 中显示空心蜡烛？

Question

大多数金融图表库都使用一些给蜡烛着色的规则:

1. 如果close >= open , 那么蜡烛是 hollow (未填写)
2. 如果close < open , 那么蜡烛是 filled
3. 如果previous close <= close , 那么蜡烛是 green
4. 如果previous close > close , 那么蜡烛是 red

jFreeChart 似乎有自己的着色规则，并且可以更改它们。默认情况下，图表看起来像这样(一些颜色已更改):

所以如您所见，可以更改蜡烛的颜色、背景、绘图边框等。

我想对图表实现规则 1 和 2(上文)。可能吗？

结果应该是这样的:

这是我当前在示例中使用的 CandlestickRenderer:

public class CandlestickRenderer extends org.jfree.chart.renderer.xy.CandlestickRenderer {

    public CandlestickRenderer() {
        setDrawVolume(false);
    }

    @Override
    public Paint getItemPaint(int series, int item) {
        OHLCDataset highLowData = (OHLCDataset)getPlot().getDataset(series);
        Number curClose = highLowData.getClose(series, item);
        Number prevClose = highLowData.getClose(series, item>0 ? item-1 : 0);
        if (prevClose.doubleValue() <=  curClose.doubleValue()) {
            return getUpPaint();
        }
        else {
            return getDownPaint();
        }
    }   
}

更新1

看来只要设置up paint就可以了至 black并绘制item pant颜色不变。

public class CandlestickRenderer extends org.jfree.chart.renderer.xy.CandlestickRenderer {

    public CandlestickRenderer() {
        setDrawVolume(false);
        setUseOutlinePaint(false);
        setUpPaint(Color.BLACK); // <-- rule 1. (plot is also black so it looks not filled)
    }

    @Override
    public Paint getItemPaint(int series, int item) {
        OHLCDataset highLowData = (OHLCDataset) getPlot().getDataset(series);
        Number curClose = highLowData.getClose(series, item);
        Number prevClose = highLowData.getClose(series, item>0 ? item-1 : 0);

        if (prevClose.doubleValue() <=  curClose.doubleValue()) {
            return Color.GREEN; // <-- rule 3.
        } else {
            return Color.RED; // <-- rule 4.
        }
    }

}

但主要问题仍然存在:

• 这是什么意思 down (downPaint)和 up (upPaint)根据 jFreeChart?它比较prev. close vs. close吗值或 open vs. close ?

• 在 jFreeChart 的源代码中，我可以在哪里找到 upPaint 的部分？ & downPaint都用过吗？

现在这是奇怪的结果:

Answer 1

我已经做到了。这是完整的自己的渲染器:

public class CandlestickRenderer extends org.jfree.chart.renderer.xy.CandlestickRenderer {

    private final Paint colorRaising = Color.GREEN;
    private final Paint colorFalling = Color.RED;
    private final Paint colorUnknown = Color.GRAY;
    private final Paint colorTransparent = Color.BLACK;

    public CandlestickRenderer() {
        setDrawVolume(false);
        setUpPaint(colorUnknown); // use unknown color if error
        setDownPaint(colorUnknown); // use unknown color if error
    }


    @Override
    public Paint getItemPaint(int series, int item) {
        OHLCDataset highLowData = (OHLCDataset) getPlot().getDataset(series);
        Number curClose = highLowData.getClose(series, item);
        Number prevClose = highLowData.getClose(series, item>0 ? item-1 : 0);

        if (prevClose.doubleValue() <=  curClose.doubleValue()) {
            return Color.GREEN;
        } else {
            return Color.RED;
        }
    }


    @Override
    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) {

        OHLCDataset highLowData = (OHLCDataset) dataset;
        double yOpen = highLowData.getOpenValue(series, item);
        double yClose = highLowData.getCloseValue(series, item);        

        // set color for filled candle
        if (yClose >= yOpen) {
            setUpPaint(colorRaising);
            setDownPaint(colorFalling);
        }

        // set color for hollow (not filled) candle
        else {
            setUpPaint(colorTransparent);
            setDownPaint(colorTransparent);
        }

        // call parent method
        super.drawItem(g2, state, dataArea, info, plot, domainAxis, rangeAxis, dataset, series, item, crosshairState, pass);
    }   

}

结果图表:

如果您需要所有示例代码，请随时与我联系。