Digital Line Chart is used to represent a sequence of discrete values, and often is a part of applications used in digital electronics, signal processing, communications etc. This example shows how to generate the Android Digital (step) Line Chart in code. In SciChart it is done by calling setIsDigitalLine(true) method on an instance of FastLineRenderableSeries class. Digital line series can be used to render an XyDataSeries, XyyDataSeries (renders Y values), XyzDataSeries, HlcDataSeries and OhlcDataSeries(renders Close values).

Tip!

You can be very flexible and change the Line appearance by far:
– Changing its’ color and thickness with setStrokeStyle(PenStyle) methods of FastLineRenderableSeries
– Make it dashed or digital line (step line) setIsVisible(), setIsDigitalLine() methods of FastLineRenderableSeries.
– Customize by adding either predefined or custom data-point markers on a line series using the PointMarker API.

Please note that custom data-point markers will be same very performant as the same bitmap rendering as in our Scatter-Charts is used.

// 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>

// DigitalLineChartFragment.java

//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2017. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales:   sales@scichart.com
//
// DigitalLineChartFragment.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.XyDataSeries;
import com.scichart.charting.visuals.SciChartSurface;
import com.scichart.charting.visuals.axes.IAxis;
import com.scichart.charting.visuals.renderableSeries.FastLineRenderableSeries;
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 DigitalLineChartFragment 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).withDrawMajorBands(true).withVisibleRange(1, 1.25).build();
        final IAxis yAxis = sciChartBuilder.newNumericAxis().withGrowBy(0.5, 0.5).withDrawMajorBands(true).withVisibleRange(2.3, 3.3).build();

        final DoubleSeries fourierSeries = DataManager.getInstance().getFourierSeries(1.0, 0.1, 5000);
        final XyDataSeries<Double, Double> dataSeries = sciChartBuilder.newXyDataSeries(Double.class, Double.class).build();
        dataSeries.append(fourierSeries.xValues, fourierSeries.yValues);

        final FastLineRenderableSeries rSeries = sciChartBuilder.newLineSeries()
                .withDataSeries(dataSeries)
                .withStrokeStyle(0xFF99EE99, 1f, true)
                .withIsDigitalLine(true)
                .build();

        UpdateSuspender.using(surface, new Runnable() {
            @Override
            public void run() {
                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).withWaveTransformation().withInterpolator(new DecelerateInterpolator()).withDuration(3000).withStartDelay(350).start();
            }
        });
    }
}

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