The smoothing algorithms or spline line series are often used when there is too much of the raw data to show on a screen of a mobile devise. It is important that the charts are easy to read, and the data displayed provides meaningful insides to the picks and trends of the data. In this case the spline series will be the best choice. The android spline lines will give the charts its smooth look, so that the customers can have a great user experience with your android applications.

This example demonstrates how you can create a Spline line for Android in Java using SplineLineRenderableSeries type. With SciChart Android Spline Line API you can also render a gap in series, add point markers onto it and paint spline line segments with different colors.

Read more in the SciChart Android Spline Line Series documentation.

Also see: Spline Band Series and Spline Mountain 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>

// SplineLineChartFragment.java

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2020. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// SplineLineChartFragment.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 android.view.animation.DecelerateInterpolator;

import com.scichart.charting.model.dataSeries.IXyDataSeries;
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.FastLineRenderableSeries;
import com.scichart.charting.visuals.renderableSeries.SplineLineRenderableSeries;
import com.scichart.core.framework.UpdateSuspender;
import com.scichart.examples.R;
import com.scichart.examples.fragments.base.ExampleBaseFragment;

import java.util.Collections;

import butterknife.BindView;

public class SplineLineChartFragment 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(0.1d, 0.1d).build();
        final IAxis yAxis = sciChartBuilder.newNumericAxis().withGrowBy(0.2d, 0.2d).build();

        final IXyDataSeries<Integer, Integer> dataSeries = sciChartBuilder.newXyDataSeries(Integer.class, Integer.class).build();
        final int[] yValues = {50, 35, 61, 58, 50, 50, 40, 53, 55, 23, 45, 12, 59, 60};
        for (int i = 0; i < yValues.length; i++) {
            dataSeries.append(i, yValues[i]);
        }

        final FastLineRenderableSeries lineSeries = sciChartBuilder.newLineSeries()
                .withDataSeries(dataSeries)
                .withPointMarker(sciChartBuilder.newPointMarker(new EllipsePointMarker()).withSize(7, 7).withStroke(0xFF006400, 1).withFill(0xFFFFFFFF).build())
                .withStrokeStyle(0xFF4282B4, 1f, true)
                .build();

        final SplineLineRenderableSeries rSeries = sciChartBuilder.newSplineLineSeries()
                .withDataSeries(dataSeries)
                .withStrokeStyle(0xFF006400, 2f, true)
                .build();

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

            sciChartBuilder.newAnimator(rSeries).withSweepTransformation().withInterpolator(new DecelerateInterpolator()).withDuration(3000).withStartDelay(350).start();
            sciChartBuilder.newAnimator(lineSeries).withSweepTransformation().withInterpolator(new DecelerateInterpolator()).withDuration(3000).withStartDelay(350).start();
        });
    }
}

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