Line Chart line color alpha

[Vattanatann]

This is code for creating dataset for Line chart.

private fun setUpChartData() {
        val mainEntries = listOf(
            Entry(1f, 20f),
            Entry(6f, 28f),
            Entry(11f, 26f),
            Entry(16f, 35f),
            Entry(21f, 30f),
            Entry(25f, 40f),
            Entry(31f, 48f)
        )

        val mainDataSet = LineDataSet(mainEntries, "Main").apply {
            setColor(R.color.red, 255) // Not working. Just example
            lineWidth = 2f

            highlightLineWidth = 2f
            highLightColor = themeColor(R.attr.bg_dark_blue)

            setDrawCircles(true)
            circleRadius = 3f
            setDrawCircleHole(false)
            setCircleColor(themeColor(R.attr.states_red))

            setDrawValues(false)
            setDrawHorizontalHighlightIndicator(false)
            setDrawVerticalHighlightIndicator(true)

            mode = LineDataSet.Mode.CUBIC_BEZIER
        }

        val avgEntries = listOf(
            Entry(1f, 5f),
            Entry(6f, 18f),
            Entry(11f, 20f),
            Entry(16f, 30f),
            Entry(21f, 38f),
            Entry(25f, 43f),
            Entry(31f, 55f)
        )

        val avgDataSet = LineDataSet(avgEntries, "Avg").apply {
            setColor(R.color.red, (0.3 * 255).toInt()) // Not working. Just example
            lineWidth = 2f

            enableDashedLine(10f, 8f, 0f)

            setDrawCircles(false)
            setDrawValues(false)
            setDrawHorizontalHighlightIndicator(false)
            setDrawVerticalHighlightIndicator(false)

            mode = LineDataSet.Mode.CUBIC_BEZIER
        }

        mBinding.chart.apply { 
            data = LineData(mainDataSet, avgDataSet)
            animateX(800, Easing.EaseInOutCubic)
            invalidate()
        }
    }

Above in setColor, I want to set alpha to avg dataset. But the alpha also set to main dataset. What is the issue here?

What I want

What the code does

[hannesa2]

As it's not a running sample, please can you post a screenshot without the setColor() and one with the setColor().
Btw, If you want really a solution you should move to https://github.com/AppDevNext/AndroidChart and make there a pull request to demonstrate the issue

[Vattanatann]

I have updated the question with screenshot.

[hannesa2]

On my fork it only draws (as desired) one dataset with alpha. Here is the resulting screenshot diff
AppDevNext/AndroidChart#753

[Vattanatann]

I switch to com.github.AppDevNext:AndroidChart, the line is drawn correctly. But not in com.github.PhilJay:MPAndroidChart:v3.1.0