The algorithms for smoothing the charts data or creating a spline series are commonly used when showing all raw data is not efficient. This might be the case when the raw dataset is so large that it does not gives meaningful insights to the pick and trends. In contrast the smoothed lines will provide a great user experience to the customers of your Android charting application. That is why we have created the Spline Line, Spline Mountain and Spline Band series for SciChart Android API.

This example demonstrates how to create a Spline Band Series for Android applications in Java using SplineBandRenderableSeries type. Spline High-Low Fill or Spline Band Series are provided by the SplineBandRenderableSeries type. This accepts data in a triplet form (X, Y1, Y2) and renders two lines with a polygon, which changes color depending on whether Y1>Y2 or vice versa. The flexible Spline Band series API allows to specify Fill, FillY1 brushes and Stroke, StrokeY1 pens. You can also add point markers onto this series.

Read more in the SciChart Android Spline Band Series documentation.

See also: Spline Mountain Series and Spline Line series.

// example_single_chart_fragment.xml

<?xml version="1.0" encoding="utf-8"?><!--*************************************************************************-->
<!-- SCICHART® Copyright SciChart Ltd. 2011-2016. All rights reserved. -->
<!--   -->
<!-- Web: http://www.scichart.com -->
<!-- Support: support@scichart.com -->
<!-- Sales:   sales@scichart.com -->
<!--  -->
<!-- example_single_chart_fragment.xml is part of the SCICHART® Examples. Permission is hereby granted -->
<!-- to modify, create derivative works, distribute and publish any part of this source -->
<!-- code whether for commercial, private or personal use. -->
<!--  -->
<!-- The SCICHART® examples are distributed in the hope that they will be useful, but -->
<!-- without any warranty. It is provided "AS IS" without warranty of any kind, either -->
<!-- expressed or implied. -->
<!--*************************************************************************-->

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <com.scichart.charting.visuals.SciChartSurface
        android:id="@+id/chart"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

// SplineBandChartFragment.java

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2020. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// SplineBandChartFragment.java is part of the SCICHART® Examples. Permission is hereby granted
// to modify, create derivative works, distribute and publish any part of this source
// code whether for commercial, private or personal use.
//
// The SCICHART® examples are distributed in the hope that they will be useful, but
// without any warranty. It is provided "AS IS" without warranty of any kind, either
// expressed or implied.
//******************************************************************************

package com.scichart.examples.fragments;

import com.daasuu.ei.Ease;
import com.daasuu.ei.EasingInterpolator;
import com.scichart.charting.model.dataSeries.XyyDataSeries;
import com.scichart.charting.visuals.SciChartSurface;
import com.scichart.charting.visuals.axes.IAxis;
import com.scichart.charting.visuals.pointmarkers.EllipsePointMarker;
import com.scichart.charting.visuals.renderableSeries.SplineBandRenderableSeries;
import com.scichart.core.framework.UpdateSuspender;
import com.scichart.examples.R;
import com.scichart.examples.data.DataManager;
import com.scichart.examples.data.DoubleSeries;
import com.scichart.examples.fragments.base.ExampleBaseFragment;

import java.util.Collections;

import butterknife.BindView;

public class SplineBandChartFragment extends ExampleBaseFragment {
    @BindView(R.id.chart)
    SciChartSurface surface;

    @Override
    protected int getLayoutId() {
        return R.layout.example_single_chart_fragment;
    }

    @Override
    protected void initExample() {
        final IAxis xAxis = sciChartBuilder.newNumericAxis().withGrowBy(0.1, 0.1).build();
        final IAxis yAxis = sciChartBuilder.newNumericAxis().withGrowBy(0.2, 0.2).build();

        final DoubleSeries data = DataManager.getInstance().getDampedSinewave(1.0, 0.005, 1000, 13);
        final DoubleSeries moreData = DataManager.getInstance().getDampedSinewave(1.0, 0.005, 1000, 12);

        final XyyDataSeries<Double, Double> dataSeries = sciChartBuilder.newXyyDataSeries(Double.class, Double.class).build();
        for (int i = 0; i < 10; i++) {
            final int index = i * 100;
            dataSeries.append(data.xValues.get(index), data.yValues.get(index), moreData.yValues.get(index));
        }

        final SplineBandRenderableSeries rSeries = sciChartBuilder.newSplineBandSeries()
                .withDataSeries(dataSeries)
                .withFillColor(0x33279B27).withFillY1Color(0x33FF1919)
                .withStrokeStyle(0xFFFF1919, 1f, true).withStrokeY1Style(0xFF279B27, 1f, true)
                .withPointMarker(sciChartBuilder.newPointMarker(new EllipsePointMarker()).withSize(7, 7).withStroke(0xFF006400, 1).withFill(0xFFFFFFFF).build())
                .build();

        UpdateSuspender.using(surface, () -> {
            Collections.addAll(surface.getXAxes(), xAxis);
            Collections.addAll(surface.getYAxes(), yAxis);
            Collections.addAll(surface.getRenderableSeries(), rSeries);
            Collections.addAll(surface.getChartModifiers(), sciChartBuilder.newModifierGroupWithDefaultModifiers().build());

            sciChartBuilder.newAnimator(rSeries).withScaleTransformation().withInterpolator(new EasingInterpolator(Ease.ELASTIC_OUT)).withDuration(3000).withStartDelay(350).start();
        });
    }
}

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