android - 使用 MpAndroidChart-CombinedChart，如何将图表分成上下两部分？

Question

在下图中，我绘制了一天的价格和每小时的交易量。
为了实现这一点，我使用了 CombinedChart类型。您可以立即看到交易量数据分散了用户对价格数据的注意力，因为两个图表都填满了屏幕。

问题:
有没有办法保留图表底部的 25% 的成交量和图表顶部的 75% 的价格？



代码如下:

private void setupChart(){
    chart.setAutoScaleMinMaxEnabled(true);
    chart.setBackgroundColor(Color.WHITE);
    chart.getDescription().setEnabled(false);
    chart.setPinchZoom(false);
    chart.setDrawGridBackground(false);
    chart.getLegend().setEnabled(true);
    chart.setDrawOrder(new CombinedChart.DrawOrder[]{ CombinedChart.DrawOrder.BAR, CombinedChart.DrawOrder.CANDLE });// draw bars behind candles

    // right side is for the volume
    YAxis rightAxis = chart.getAxisRight();
    rightAxis.setDrawGridLines(false);
    rightAxis.setAxisMinimum(0f);
}

@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
    chart.resetTracking();

    ArrayList<HistoricPrice> historicPrices = presenter.getHistoricalDataGranular(DEFAULT_GRANULARITY_MINS);

    ArrayList<CandleEntry> valuesCandles = new ArrayList<>();
    ArrayList<BarEntry> valuesBars = new ArrayList<>();


    for (int i = progress; (i < progress+MAX_CANDLES_COUNT) && (i < historicPrices.size()); i++) {
        HistoricPrice historicPrice = historicPrices.get(i);
        CandleEntry candleEntry = new CandleEntry(i, historicPrice.high.floatValue(), historicPrice.low.floatValue(), historicPrice.open.floatValue(), historicPrice.close.floatValue());
        valuesCandles.add(candleEntry);
        BarEntry barEntry = new BarEntry(i, Float.valueOf(historicPrice.volume.toPlainString()));
        valuesBars.add(barEntry);
    }

    CandleDataSet set1 = new CandleDataSet(valuesCandles, "Prices");
    set1.setDrawIcons(false);
    set1.setAxisDependency(YAxis.AxisDependency.LEFT);
    set1.setShadowColor(Color.DKGRAY);
    set1.setShadowWidth(0.7f);
    set1.setDecreasingColor(Color.RED);
    set1.setDecreasingPaintStyle(Paint.Style.FILL);
    set1.setIncreasingColor(Color.rgb(122, 242, 84));
    set1.setIncreasingPaintStyle(Paint.Style.FILL);
    set1.setNeutralColor(Color.BLUE);
    set1.setDrawValues(true);
    set1.setShowCandleBar(true);
    CandleData candleData = new CandleData(set1);

    BarDataSet set2 = new BarDataSet(valuesBars, "Volume");
    set2.setColor(ContextCompat.getColor(this, R.color.blue_grey));
    set2.setDrawValues(true);
    set2.setAxisDependency(YAxis.AxisDependency.RIGHT);
    BarData barData = new BarData(set2);

    CombinedData data = new CombinedData();
    data.setData(candleData);
    data.setData(barData);


    chart.setData(data);
    chart.invalidate();
}

Answer 1

您可以设置数据集是否依赖于 leftAxis 或 rightAxis。因此，您将 set1 设置为依赖 leftAxis，将 set2 设置为 RightAxis。完成此操作后，此调用 set1.getAxisLeft().setAxisMinimum(minValue) 将从图形开始的位置开始。
看看下面的 fragment

CandleDataSet set1 = new CandleDataSet(valuesCandles, "Prices");
set1.setAxisDependency(YAxis.AxisDependency.LEFT);
set1.getAxisLeft().setAxisMinimum(minValue)

BarDataSet set2 = new BarDataSet(valuesBars, "Volume");
set2.setAxisDependency(YAxis.AxisDependency.RIGHT);