Pre loader

HeatMap ResamplingMode Max not working

Welcome to the SciChart Forums!

  • Please read our Question Asking Guidelines for how to format a good question
  • Some reputation is required to post answers. Get up-voted to avoid the spam filter!
  • We welcome community answers and upvotes. Every Q&A improves SciChart for everyone

WPF Forums | JavaScript Forums | Android Forums | iOS Forums

0
0

I have created a heatmap chart with values for the data series with four vertical lines of width 1. When the width of data series is smaller than width of SciChartSurface in pixels the four lines are clearly visible. However when I increase the width of data series to be bigger than the width in pixels, then some lines disappear, even though I’ve set the re-sampling mode to ResamplingMode.Max.

I wasn’t able to attach images to the post (got a Forbidden error), so I’ve uploaded them to Imagur:
Missing Lines
Visible lines

Here is the code from which the screen shots were made:

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import com.scichart.charting.model.dataSeries.UniformHeatmapDataSeries
import com.scichart.charting.visuals.SciChartSurface
import com.scichart.charting.visuals.renderableSeries.ColorMap
import com.scichart.data.numerics.ResamplingMode
import com.scichart.drawing.utility.ColorUtil
import com.scichart.extensions.builders.SciChartBuilder
import kotlin.math.roundToInt

const val WIDTH = 2000
const val HEIGHT = 50

class MainActivity : AppCompatActivity()
{
    override fun onCreate(savedInstanceState: Bundle?)
    {
        super.onCreate(savedInstanceState)

        SciChartSurface.setRuntimeLicenseKey(getString(R.string.sciChart_license))
        SciChartBuilder.init(this)

        setContentView(R.layout.activity_main)

        val chartSurface = findViewById<SciChartSurface>(R.id.chart)
        val chartBuilder = SciChartBuilder.instance()

        val xAxis = chartBuilder.newNumericAxis().build()
        val yAxis = chartBuilder.newNumericAxis().build()

        val dataSeries = UniformHeatmapDataSeries<Int, Int, Int>(Int::class.javaObjectType, Int::class.javaObjectType, Int::class.javaObjectType, WIDTH, HEIGHT)
        for (x in 0 until WIDTH)
        {
            for (y in 0 until HEIGHT)
            {
                val value = when (x)
                {
                    0,
                    (0.25 * WIDTH).roundToInt(),
                    (0.5 * WIDTH).roundToInt(),
                    (0.75 * WIDTH).roundToInt() -> 50
                    else                        -> 0
                }
                dataSeries.updateZAt(x, y, value)
            }
        }

        val series = chartBuilder.newUniformHeatmap()
            .withDataSeries(dataSeries)
            .withColorMap(ColorMap(intArrayOf(ColorUtil.DarkBlue, ColorUtil.CornflowerBlue, ColorUtil.DarkGreen, ColorUtil.Chartreuse, ColorUtil.Yellow, ColorUtil.Red), floatArrayOf(0f, 0.2f, 0.4f, 0.6f, 0.8f, 1f)))
            .withResamplingMode(ResamplingMode.Max)
            .build()

        chartSurface.suspendUpdates().use {
            chartSurface.xAxes.add(xAxis)
            chartSurface.yAxes.add(yAxis)
            chartSurface.renderableSeries.add(series)
        }
    }
}
Version
2.2.1.2391
  • You must to post comments
0
0

Hi Miha,

Thanks for your question.

Unfortunately, FastUniformHeatmapRenderableSeries doesn’t support resampling for now and it always copies all values to texture which is used for rendering. I believe line disappears because of how texture filtering is implemented in OpenGL – there are too many texture pixels in single screen pixel and OpenGL rasterizer selects only one of them to be rendered. Unfortunately this is a limitation of current heatmap implementation and there is nothing we can do without significant rewriting of its code. For now I would suggest you to submit feature request and if it gets enough votes we’ll implement it.

Best regards,
Yura

  • You must to post comments
Showing 1 result
Your Answer

Please first to submit.

Try SciChart Today

Start a trial and discover why we are the choice
of demanding developers worldwide

Start TrialCase Studies