MpAndroidChart set background between limit lines

问题

I a using MpAndroidChart library. I need to implement a design where I need to color the area between two limit lines. I have attached an image for reference. I have tried multiple ways but I have failed to achieve it. I am using this library for the first time. Can anyone help me about how this could be achieved.

As you can see the green shade behind the line graph. Which is the limit. I need to get that green shade

Thanks in advance,

Anudeep Reddy.

回答1:

I don't think that there is a direct way to achieve this, but this workaround should help you:

LimitLine ll = new LimitLine(lowerLimit, "Systolic range");
ll.setLineColor(Color.GREEN);
ll.setLineWidth(upperLimit - lowerLimit);

ll.setTextColor(Color.WHITE);
ll.setTextSize(12f);

chart.getAxisLeft().setDrawLimitLinesBehindData(true);

The important thing here is the method setDrawLimitLinesBehindData(true).

As always, all the information is available in the documentation.

回答2:

This can be done by sub-classing the chart class (e.g. LineChart) and then overriding the onDraw() method. In the overridden onDraw() you can draw the rectangle(s) you need directly onto the canvas and then call super.onDraw() to complete the rendering of the chart.

There is an example of how to do this on the MP Android Github (see below). I followed the code in the example and it worked well for me.

https://github.com/PhilJay/MPAndroidChart/issues/485

回答3:

I had the same problem but reached a different workaround without having to subclass the LineChart. Using canvas to draw the rectangle works, but you have to translate your charts coordinates to the canvas coordinates. You cannot use a single limit line as there is a limit to the width of the line. The workaround I used was to simply loop through limit lines to create a rectangle within my range.

    float increment = (rangeHigh - rangeLow) / 20;
    float metricLine = rangeLow;

    for(int i = 0; i < 20; i++) {
        LimitLine llRange = new LimitLine(metricLine, "");
        llRange.setLineColor(Color.parseColor("#b5eb45"));
        llRange.setLineWidth(10f);
        leftAxis.addLimitLine(llRange);
        metricLine = metricLine + increment;
    }

来源：https://stackoverflow.com/questions/37406003/mpandroidchart-set-background-between-limit-lines