有没有办法获得 MP Android BarChart 的 px/dp 的条宽？

Question

I want to create a "table" (which is build with a recycle view) below my chart. But I want the RecycleView to have the same number of elements of my chart (In this case 7) Is there a way to get the column width of the Bar Chart so I can assign the same width to my Recycle View Cells?

At the end (if it is posible) I want the two scroll to be synced.

Answer 1

The bar width in pixels is the difference between the value bar width x position (wp) and the label starting position (xp):

        Transformer transformer = bChart.getTransformer(YAxis.AxisDependency.LEFT);
        float bw = (float) transformer.getPixelForValues(bChart.getBarData().getBarWidth(), 0).x;
        float xp = (float) transformer.getPixelForValues(0, 0).x;
        float barWidthInPixels = bw - xp;

Answer 2

As you can see from the javadoc, BarData#getBarWidth() returns a the bar width in chart values (not in pixels).

You can translate between chart values (x and y values on the chart) and pixel values (for the Android handset's screen) using a Transformer . Something like the following:

float barWidth = barData.getBarWidth();
Transformer transformer = mChart.getViewPortHandler().getTransformer(AxisDependency.LEFT);
MPPointD barDimensPoint = transformer.getPixelForValues(barWidth, 0);
float barWidthInPixels = (float) barDimensPoint.x;

It's essentially the opposite operation from this question where the requirement is to translate pixels into values on the chart.