MPAndroidChart: How do I get the corresponding chart x-value for a pixel point?

Question

How can I obtain the corresponding x-axis value (xIndex) of a pixel point in a ScatterChart?

I have been looking through the source code of the library and I think t

Answer 1

Using MPAndroidChart 3.0.1

I think the method you want is:

public MPPointD getValuesByTouchPoint(float x, float y);

Here's a snip from the javadoc:

/**
 * Returns a recyclable MPPointD instance.
 * returns the x and y values in the chart at the given touch point
 * (encapsulated in a MPPointD). This method transforms pixel coordinates to
 * coordinates / values in the chart. This is the opposite method to
 * getPixelsForValues(...).

To use it in your app, do something like this:

MPPointD point = mChart.getTransformer(AxisDependency.LEFT).getValuesByTouchPoint(x,y);
double xValue = point.x;
double yValue = point.y;

The parameters passed into the method (float x, float y) are your pixel co-ordinates that you want to be converted into x and y values in your chart.