android - MPAndroidChart 中限制线的自定义 View

Question

是否可以用自定义布局替换 LimitLine？所以它看起来像这样:

我看到的解决方案很少:

1. 也许库中有这样的自定义方法，有吗？
2. 获取存储值的 TextView 的坐标，并在该位置添加自定义布局。但是我怎样才能到达这个 TextView？

也许有人遇到过这个问题。请分享您的经验。

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编辑:最新的部分解决方案

经过长期搜索解决方案后，我想到了通过限制线的坐标以编程方式添加自定义 View 。

屏幕总体布局如下:

坐标的计算非常简单。 X 可从图表坐标和 Y 中获知:

Y = ((max - lastValue) * height) / ((max + min) + y)

所以至此我基本上知道了我需要的位置。尽管由于父 ScrollView，我不确定它是否正确。

下一步是在这些坐标处添加自定义布局 (x, y)

新的问题来了。我试图将 View 添加到顶部 RelativeLayout。它已添加，但不会与 ScrollView 一起移动。因此，它需要准确地在图表上添加该 View 。看看我是如何尝试实现这一目标的:

private void addCustomLayoutOnLimitLine(final double lastValue) {

    mChart.post(new Runnable() { //check location when view is created
        public void run() {
            int[] chartLocationOnScreen = new int[2];
            mChart.getLocationOnScreen(chartLocationOnScreen);

            int x = chartLocationOnScreen[0];
            int y = chartLocationOnScreen[1];

            int width = mChart.getWidth();
            int height = mChart.getHeight();


            double max = mChart.getYMax();
            double min = mChart.getYMin();

            int limitXPoint = x + width;
            int limitYPoint = (int) ((((max - lastValue) * height) / (max + min))+ y);



            LayoutInflater inflater = (LayoutInflater)   getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            RelativeLayout rlValue = (RelativeLayout) inflater.inflate(R.layout.item_chart_value, null);
            TextView tvValue = (TextView) rlValue.findViewById(R.id.tv_value);
            tvValue.setText(String.valueOf(lastValue));

            RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(50, 50);
            params.leftMargin = limitXPoint - 100;
            params.topMargin = limitYPoint;
            mChart.addView(rlValue, params); //this doesn't seem to be working
            rlValue.bringToFront();
        }
    });
}

也许我应该到达 Chart 的父布局并在那里扩展我的自定义布局。但是如何？

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编辑 2:在图表上添加了自定义 View ，但由于 ScrollView 无法找到合适的位置

现在的情况是这样的:

也许我计算有误。但至少那个 View 用新值改变了它的位置，尽管它从来没有达到正确的协调。

private void addCustomLayoutOnLimitLine() {
    if (mChart == null){
        return;
    }

    mChart.post(new Runnable() { //check location when view is created
        public void run() {
            int[] chartLocationOnScreen = new int[2];
            mChart.getLocationOnScreen(chartLocationOnScreen);

            int xChart = chartLocationOnScreen[0];
            int yChart = chartLocationOnScreen[1];

            int chartWidth = mChart.getWidth();
            int chartHeight = mChart.getHeight();

            int rootWidth = rlSvContent.getWidth();
            int rootHeight = rlSvContent.getHeight(); //this is height of ScrollView

            int infoWidth = llInfoWrapper.getWidth(); //width of info panel ABOVE chart
            int infoHeight = llInfoWrapper.getHeight();

            double lastValue = mSingleAsset.getGraph().get(mSingleAsset.getGraph().size() - 1).getValue();
            double maxValue = mChart.getYMax();
            double minValue = mChart.getYMin();

            int limitXPoint = (rootWidth - chartWidth) / 2 + chartWidth;
            int limitYPoint = (int) ((maxValue - lastValue) * chartHeight/(maxValue - minValue)) + yChart;

            tvCustomValue.setText(SingleAsset.round((float) lastValue, 2).toString()); //display last value on custom view

            RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
            params.leftMargin = limitXPoint - xChart - 50; //move custom view. xChart = right margin value and 50 is taken to count values bar to the right of chart
            params.topMargin = limitYPoint;
            rlCustomValue.setLayoutParams(params);
            rlCustomValue.bringToFront();
            rlCustomValue.invalidate();
        }
    });
}

Answer 1

<ScrollView>

    <LinearLayout/>

    <FrameLayout>

        <Chart/>
        <TextView/>

    <FrameLauyout>

</ScrollView>

使用 ViewPortHandler 获取图表的偏移量

    float offsetTop = mChart.getViewPortHandler().offsetTop();
    float offsetLeft = mChart.getViewPortHandler().offsetLeft();
    float offsetRight = mChart.getViewPortHandler().offsetRight();
    float chartHeight = mChart.getViewPortHandler().contentHeight();