Android Chart - Examples
SciChart Android ships with ~90 Android Chart Examples which you can browse, play with, view the source-code and even export each SciChart Android Chart Example to a stand-alone Android Studio project. All of this is possible with the new and improved SciChart Android Examples Suite, which ships as part of our Android Charts SDK.
This example shows persistence of old traces giving a ‘ghosted’ effect.
Tip!
As new series are drawn older series are made increasingly transparent until they become invisible.
The full source code for the Android Chart Realtime Ghosted Traces example is included below (Scroll down!).
Did you know you can also view the source code from one of the following sources as well?
- Clone the SciChart.Android.Examples from Github.
- Or, view source and export each example to an Android Studio project from the Java version of the SciChart Android Examples app.
- Also the SciChart Android Trial contains the full source for the examples (link below).
Kotlin: RealTimeGhostTracesFragment.kt
View source code//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2021. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales: sales@scichart.com
//
// RealTimeGhostTracesFragment.kt is part of SCICHART®, High Performance Scientific Charts
// For full terms and conditions of the license, see http://www.scichart.com/scichart-eula/
//
// This source code is protected by international copyright law. Unauthorized
// reproduction, reverse-engineering, or distribution of all or any portion of
// this source code is strictly prohibited.
//
// This source code contains confidential and proprietary trade secrets of
// SciChart Ltd., and should at no time be copied, transferred, sold,
// distributed or made available without express written permission.
//******************************************************************************
package com.scichart.examples.fragments.examples2d.createRealtimeCharts.kt
import android.view.LayoutInflater
import android.widget.SeekBar
import android.widget.SeekBar.OnSeekBarChangeListener
import com.scichart.charting.model.dataSeries.XyDataSeries
import com.scichart.charting.visuals.SciChartSurface
import com.scichart.charting.visuals.axes.AutoRange
import com.scichart.core.utility.NumberUtil
import com.scichart.data.model.DoubleRange
import com.scichart.drawing.utility.ColorUtil
import com.scichart.examples.R
import com.scichart.examples.data.DataManager
import com.scichart.examples.databinding.ExampleRealTimeGhostTracesFragmentBinding
import com.scichart.examples.fragments.base.ExampleBaseFragment
import com.scichart.examples.utils.scichartExtensions.*
import java.util.*
import java.util.concurrent.Executors
import java.util.concurrent.ScheduledFuture
import java.util.concurrent.TimeUnit
class RealTimeGhostTracesFragment : ExampleBaseFragment<ExampleRealTimeGhostTracesFragmentBinding>(), OnSeekBarChangeListener {
private val scheduledExecutorService = Executors.newSingleThreadScheduledExecutor()
private var schedule: ScheduledFuture<*>? = null
override fun showDefaultModifiersInToolbar(): Boolean = false
override fun inflateBinding(inflater: LayoutInflater): ExampleRealTimeGhostTracesFragmentBinding {
return ExampleRealTimeGhostTracesFragmentBinding.inflate(inflater)
}
override fun initExample(binding: ExampleRealTimeGhostTracesFragmentBinding) {
binding.surface.theme = R.style.SciChart_NavyBlue
binding.surface.run {
xAxes { numericAxis { autoRange = AutoRange.Always } }
yAxes { numericAxis {
growBy = DoubleRange(0.1, 0.1)
autoRange = AutoRange.Never
visibleRange = DoubleRange(-2.0, 2.0)
}}
renderableSeries {
val seriesColor = (0xff68bcae).toInt();
fastLineRenderableSeries { strokeStyle = SolidPenStyle(seriesColor) }
fastLineRenderableSeries { strokeStyle = SolidPenStyle(ColorUtil.argb(seriesColor, 0.9f)) }
fastLineRenderableSeries { strokeStyle = SolidPenStyle(ColorUtil.argb(seriesColor, 0.8f)) }
fastLineRenderableSeries { strokeStyle = SolidPenStyle(ColorUtil.argb(seriesColor, 0.7f)) }
fastLineRenderableSeries { strokeStyle = SolidPenStyle(ColorUtil.argb(seriesColor, 0.62f)) }
fastLineRenderableSeries { strokeStyle = SolidPenStyle(ColorUtil.argb(seriesColor, 0.55f)) }
fastLineRenderableSeries { strokeStyle = SolidPenStyle(ColorUtil.argb(seriesColor, 0.45f)) }
fastLineRenderableSeries { strokeStyle = SolidPenStyle(ColorUtil.argb(seriesColor, 0.35f)) }
fastLineRenderableSeries { strokeStyle = SolidPenStyle(ColorUtil.argb(seriesColor, 0.25f)) }
fastLineRenderableSeries { strokeStyle = SolidPenStyle(ColorUtil.argb(seriesColor, 0.15f)) }
}
}
binding.seekBar.run {
setOnSeekBarChangeListener(this@RealTimeGhostTracesFragment)
onProgressChanged(this, this.progress, false)
}
}
override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
if (progress > 0) {
binding.speedValue.text = String.format("%d ms", progress)
schedule?.cancel(true)
schedule = scheduledExecutorService.scheduleWithFixedDelay(scheduledRunnable, 0, progress.toLong(), TimeUnit.MILLISECONDS)
}
}
override fun onStartTrackingTouch(seekBar: SeekBar?) { }
override fun onStopTrackingTouch(seekBar: SeekBar?) { }
private val scheduledRunnable: Runnable = object : Runnable {
private var lastAmplitude = 1.0
private val phase = 0.0
private val random = Random()
override fun run() {
val surface = binding.surface
surface.suspendUpdates {
val dataSeries = XyDataSeries<Double, Double>()
val randomAmplitude = NumberUtil.constrain(lastAmplitude + (random.nextDouble() - 0.5), -2.0, 2.0)
val noisySinewave = DataManager.getInstance().getNoisySinewave(randomAmplitude, phase, 1000, 0.25)
lastAmplitude = randomAmplitude
dataSeries.append(noisySinewave.xValues, noisySinewave.yValues)
reassignRenderableSeries(surface, dataSeries)
}
}
}
private fun reassignRenderableSeries(surface: SciChartSurface, dataSeries: XyDataSeries<Double, Double>) {
surface.suspendUpdates {
val rs = surface.renderableSeries
// shift old data series
rs[9].dataSeries = rs[8].dataSeries
rs[8].dataSeries = rs[7].dataSeries
rs[7].dataSeries = rs[6].dataSeries
rs[6].dataSeries = rs[5].dataSeries
rs[5].dataSeries = rs[4].dataSeries
rs[4].dataSeries = rs[3].dataSeries
rs[3].dataSeries = rs[2].dataSeries
rs[2].dataSeries = rs[1].dataSeries
rs[1].dataSeries = rs[0].dataSeries
// use new data series to draw first renderable series
rs[0].dataSeries = dataSeries
}
}
override fun onDestroyView() {
super.onDestroyView()
schedule?.cancel(true)
}
}
Java: RealTimeGhostTracesFragment.java
View source code//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2021. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales: sales@scichart.com
//
// RealTimeGhostTracesFragment.java is part of SCICHART®, High Performance Scientific Charts
// For full terms and conditions of the license, see http://www.scichart.com/scichart-eula/
//
// This source code is protected by international copyright law. Unauthorized
// reproduction, reverse-engineering, or distribution of all or any portion of
// this source code is strictly prohibited.
//
// This source code contains confidential and proprietary trade secrets of
// SciChart Ltd., and should at no time be copied, transferred, sold,
// distributed or made available without express written permission.
//******************************************************************************
package com.scichart.examples.fragments.examples2d.createRealtimeCharts;
import android.view.LayoutInflater;
import android.widget.SeekBar;
import androidx.annotation.NonNull;
import com.scichart.charting.model.RenderableSeriesCollection;
import com.scichart.charting.model.dataSeries.XyDataSeries;
import com.scichart.charting.visuals.SciChartSurface;
import com.scichart.charting.visuals.axes.AutoRange;
import com.scichart.charting.visuals.axes.NumericAxis;
import com.scichart.core.framework.UpdateSuspender;
import com.scichart.core.utility.NumberUtil;
import com.scichart.data.model.DoubleRange;
import com.scichart.drawing.utility.ColorUtil;
import com.scichart.examples.R;
import com.scichart.examples.data.DataManager;
import com.scichart.examples.data.DoubleSeries;
import com.scichart.examples.databinding.ExampleRealTimeGhostTracesFragmentBinding;
import com.scichart.examples.fragments.base.ExampleBaseFragment;
import java.util.Collections;
import java.util.Random;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
public class RealTimeGhostTracesFragment extends ExampleBaseFragment<ExampleRealTimeGhostTracesFragmentBinding> implements SeekBar.OnSeekBarChangeListener {
private final ScheduledExecutorService scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
private ScheduledFuture<?> schedule;
@Override
public boolean showDefaultModifiersInToolbar() {
return false;
}
@NonNull
@Override
protected ExampleRealTimeGhostTracesFragmentBinding inflateBinding(@NonNull LayoutInflater inflater) {
return ExampleRealTimeGhostTracesFragmentBinding.inflate(inflater);
}
@Override
protected void initExample(ExampleRealTimeGhostTracesFragmentBinding binding) {
binding.surface.setTheme(R.style.SciChart_NavyBlue);
final NumericAxis xAxis = sciChartBuilder.newNumericAxis().withAutoRangeMode(AutoRange.Always) .build();
final NumericAxis yAxis = sciChartBuilder.newNumericAxis()
.withGrowBy(new DoubleRange(0.1d, 0.1d))
.withAutoRangeMode(AutoRange.Never)
.withVisibleRange(new DoubleRange(-2d, 2d))
.build();
final SciChartSurface surface = binding.surface;
Collections.addAll(surface.getXAxes(), xAxis);
Collections.addAll(surface.getYAxes(), yAxis);
final int seriesColor = 0xFF68bcae;
Collections.addAll(surface.getRenderableSeries(),
sciChartBuilder.newLineSeries().withStrokeStyle(seriesColor).build(),
sciChartBuilder.newLineSeries().withStrokeStyle(ColorUtil.argb(seriesColor, 0.9f)).build(),
sciChartBuilder.newLineSeries().withStrokeStyle(ColorUtil.argb(seriesColor, 0.8f)).build(),
sciChartBuilder.newLineSeries().withStrokeStyle(ColorUtil.argb(seriesColor, 0.7f)).build(),
sciChartBuilder.newLineSeries().withStrokeStyle(ColorUtil.argb(seriesColor, 0.62f)).build(),
sciChartBuilder.newLineSeries().withStrokeStyle(ColorUtil.argb(seriesColor, 0.55f)).build(),
sciChartBuilder.newLineSeries().withStrokeStyle(ColorUtil.argb(seriesColor, 0.45f)).build(),
sciChartBuilder.newLineSeries().withStrokeStyle(ColorUtil.argb(seriesColor, 0.35f)).build(),
sciChartBuilder.newLineSeries().withStrokeStyle(ColorUtil.argb(seriesColor, 0.25f)).build(),
sciChartBuilder.newLineSeries().withStrokeStyle(ColorUtil.argb(seriesColor, 0.15f)).build()
);
final SeekBar seekBar = binding.seekBar;
seekBar.setOnSeekBarChangeListener(this);
onProgressChanged(seekBar, seekBar.getProgress(), false);
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if (progress > 0) {
binding.speedValue.setText(String.format("%d ms", progress));
if (schedule != null) {
schedule.cancel(true);
}
schedule = scheduledExecutorService.scheduleWithFixedDelay(scheduledRunnable, 0, progress, TimeUnit.MILLISECONDS);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) { }
@Override
public void onStopTrackingTouch(SeekBar seekBar) { }
private final Runnable scheduledRunnable = new Runnable() {
private double lastAmplitude = 1.0;
private double phase = 0;
private final Random random = new Random();
@Override
public void run() {
final SciChartSurface surface = binding.surface;
UpdateSuspender.using(surface, () -> {
final XyDataSeries<Double, Double> dataSeries = new XyDataSeries<>(Double.class, Double.class);
final double randomAmplitude = NumberUtil.constrain(lastAmplitude + (random.nextDouble() - 0.5), -2d, 2);
final DoubleSeries noisySinewave = DataManager.getInstance().getNoisySinewave(randomAmplitude, phase, 1000, 0.25);
lastAmplitude = randomAmplitude;
dataSeries.append(noisySinewave.xValues, noisySinewave.yValues);
reassignRenderableSeries(surface, dataSeries);
});
}
};
private void reassignRenderableSeries(final SciChartSurface surface, final XyDataSeries<Double, Double> dataSeries) {
UpdateSuspender.using(surface, () -> {
final RenderableSeriesCollection rs = surface.getRenderableSeries();
// shift old data series
rs.get(9).setDataSeries(rs.get(8).getDataSeries());
rs.get(8).setDataSeries(rs.get(7).getDataSeries());
rs.get(7).setDataSeries(rs.get(6).getDataSeries());
rs.get(6).setDataSeries(rs.get(5).getDataSeries());
rs.get(5).setDataSeries(rs.get(4).getDataSeries());
rs.get(4).setDataSeries(rs.get(3).getDataSeries());
rs.get(3).setDataSeries(rs.get(2).getDataSeries());
rs.get(2).setDataSeries(rs.get(1).getDataSeries());
rs.get(1).setDataSeries(rs.get(0).getDataSeries());
// use new data series to draw first renderable series
rs.get(0).setDataSeries(dataSeries);
});
}
@Override
public void onDestroyView() {
super.onDestroyView();
if (schedule != null) {
schedule.cancel(true);
}
}
}
