Candlestick chart stroke styling

Hi May Lun,

I’ve tried to adapt the code from the question which you referenced so it could be used in v2.0. You need to change one line to make it work, just replace:

final OhlcRenderPassData currentRenderPassData = ((FastCandlestickRenderableSeries<?, ?>) renderableSeries).getCurrentRenderPassData();

on

 final OhlcRenderPassData currentRenderPassData = (OhlcRenderPassData) renderableSeries.getCurrentRenderPassData();

The rest of code should be the same. Here is an entire code of PaletteProvider:

    public class CandlePaletteProvider extends PaletteProviderBase<FastCandlestickRenderableSeries> implements IStrokePaletteProvider, IFillPaletteProvider {

    private final IntegerValues colors = new IntegerValues();

    public CandlePaletteProvider() {
        super(FastCandlestickRenderableSeries.class);
    }

    @Override
    public void update() {
        final OhlcRenderPassData currentRenderPassData = (OhlcRenderPassData) renderableSeries.getCurrentRenderPassData();

        final int pointsCount = currentRenderPassData.pointsCount();
        colors.setSize(pointsCount);

        final int[] colorsItems = colors.getItemsArray();
        final double[] closeValues = currentRenderPassData.closeValues.getItemsArray();

        colorsItems[0] = Color.GREEN;
        for (int i = 1; i < pointsCount; i++) {
            colorsItems[i] = closeValues[i] >= closeValues[i-1] ? Color.GREEN : Color.RED;
        }
    }

    @Override
    public final IntegerValues getFillColors() {
        return colors;
    }

    @Override
    public final IntegerValues getStrokeColors() {
        return colors;
    }
}

Edit: To demonstrate how to use this code I modified candlestick chart example from our demo application:

  @Override
protected void initExample() {
    PriceSeries priceSeries = DataManager.getInstance().getPriceDataIndu(getActivity());

    IOhlcDataSeries<Date, Double> dataSeries = new OhlcDataSeries<>(Date.class, Double.class);
    dataSeries.append(priceSeries.getDateData(), priceSeries.getOpenData(), priceSeries.getHighData(), priceSeries.getLowData(), priceSeries.getCloseData());

    int size = priceSeries.size();
    final IAxis xAxis = sciChartBuilder.newCategoryDateAxis().withVisibleRange(size - 30, size).withGrowBy(0, 0.1).build();
    final IAxis yAxis = sciChartBuilder.newNumericAxis().withGrowBy(0d, 0.1d).withAutoRangeMode(AutoRange.Always).build();

    final FastCandlestickRenderableSeries candlestickSeries = sciChartBuilder.newCandlestickSeries()
            .withPaletteProvider(new CandlePaletteProvider())
            .withDataSeries(dataSeries)
            .build();

    UpdateSuspender.using(surface, new Runnable() {
        @Override
        public void run() {
            Collections.addAll(surface.getRenderableSeries(), candlestickSeries);
            Collections.addAll(surface.getXAxes(), xAxis);
            Collections.addAll(surface.getYAxes(), yAxis);

            surface.getChartModifiers().add(sciChartBuilder.newModifierGroupWithDefaultModifiers().build());
        }
    });
}

Hope this will help you!

Best regards,
Yura