MPAndroidChart Axis multiline labels

This PR allow multiline labels on the xAxis using '\n'

Example :

  XAxis xAxis = mChart.getXAxis();
  xAxis.setMultiLineLabel(true);


  xAxis.setValueFormatter(new IAxisValueFormatter() {
            @Override
           public String getFormattedValue(float value, AxisBase axis) {
                return value+"\n"+"%";
            }
        });

Jun 16 '17 14:06 fabriziogueli

Maybe it will be better to use StaticLayout for multiline text instead of splitting by '\n'?

Jul 05 '17 11:07 shamilovstas

This modification would be useful. hope @PhilJay or someone else will have a look :)

Jul 13 '17 11:07 ClemMahe

The texts are not center aligned. Here are my updates to your PR. In Utils.java#drawXMultiLineText()

Change paint.setTextAlign(Paint.Align.LEFT); to paint.setTextAlign(Paint.Align.CENTER);
Change drawOffsetX += x; to drawOffsetX += x + (mDrawTextRectBuffer.width() / 2.0f);

These changes are not tested if the angleDegrees != 0.f

The user should also add myChart.setExtraBottomOffset(20); or any number to accomodate the new line.

Jul 14 '17 16:07 dhagz

It is very important feature! I hope someone will look at this. If you have problem with alignment, use static layout. From my experience it is much easier than calculating manually :)