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Android Chart Realtime Ghosted Traces
// Android Chart Examples
SciChart Android ships with ~60 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.
// Source Code
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).
// example_real_time_ghost_traces_fragment.xml
<!--*************************************************************************-->
<!-- SCICHART® Copyright SciChart Ltd. 2011-2016. All rights reserved. -->
<!-- -->
<!-- Web: http://www.scichart.com -->
<!-- Support: support@scichart.com -->
<!-- Sales: sales@scichart.com -->
<!-- -->
<!-- example_real_time_ghost_traces_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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".fragments.RealTimeGhostTracesFragment">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="4dp">
<TextView
android:id="@+id/speedText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:text="@string/speed_text"
android:textColor="@android:color/white" />
<TextView
android:id="@+id/speedValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:textColor="@android:color/white" />
<SeekBar
android:id="@+id/seekBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_toEndOf="@id/speedText"
android:layout_toStartOf="@id/speedValue"
android:max="100"
android:progress="20" />
</RelativeLayout>
<com.scichart.charting.visuals.SciChartSurface
android:id="@+id/chart"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
// RealTimeGhostTracesFragment.java
//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2017. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales: sales@scichart.com
//
// RealTimeGhostTracesFragment.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.widget.SeekBar;
import android.widget.TextView;
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.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;
import butterknife.BindView;
public class RealTimeGhostTracesFragment extends ExampleBaseFragment implements SeekBar.OnSeekBarChangeListener{
@BindView(R.id.seekBar)
SeekBar seekBar;
@BindView(R.id.speedValue)
TextView speedValue;
@BindView(R.id.chart)
SciChartSurface surface;
private final ScheduledExecutorService scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
private ScheduledFuture<?> schedule;
@Override
public boolean showDefaultModifiersInToolbar() {
return false;
}
@Override
protected int getLayoutId() {
return R.layout.example_real_time_ghost_traces_fragment;
}
@Override
protected void initExample() {
seekBar.setOnSeekBarChangeListener(this);
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();
Collections.addAll(surface.getXAxes(), xAxis);
Collections.addAll(surface.getYAxes(), yAxis);
final int seriesColor = ColorUtil.LimeGreen;
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());
onProgressChanged(seekBar, seekBar.getProgress(), false);
}
@Override
public void onDestroyView() {
super.onDestroyView();
if (schedule != null)
schedule.cancel(true);
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if (progress > 0) {
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 Random random = new Random();
@Override
public void run() {
UpdateSuspender.using(surface, new Runnable() {
@Override
public void run() {
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(dataSeries);
}
});
}
};
private void reassignRenderableSeries(final XyDataSeries<Double, Double> dataSeries) {
UpdateSuspender.using(surface, new Runnable() {
@Override
public void run() {
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);
}
});
}
}