Tag: android

Hello

I was wondering if it would be possible to create a simple clean looking chart like described in the attached image. I am looking for a “SuccessRateChart” that has some similarity to the PieChart but does not use the whole circle to describe its content. I would also need a way to adjust the visible radius of the Pie. In means of information visualization you often hear the term “doughnut chart”…

On way could be to draw some circle stacked over the chart itself, but there should be a better solution.

Would love to hear from you,

Kind regards,
Stephan

We are working on an android based ELD application. We are looking for a ELD graph. Is it possible to accomplish this using SCICHART?

This issue repros on Android 4.4 API 19, but not API 27. It happens with the example project (Multi-Pane Stock Charts). The issue is that on certain zoom levels, the x-axis labels are cut off (so instead of displaying 11 Mar, it just displays 11).

I have tried to override TradeChartAxisLabelFormatter with my custom implementation but saw the same issue, so the bug seems to be in the provider or somewhere else.

Please see screenshot: https://imgur.com/a/2RDC2MZ

I was wondering about the possibilities to show markers. I dug a while in the examples and played with default interactions, which use dragging to update the position of the marker.

On mobile devices this conflicts a little with the pan interaction to move the chart. I saw there’s also the possibility to pan using the axes area. There’s also the possibility to just tap on the chart, which doesn’t conflict with other interactions, to show a marker, but I couldn’t find how to do this. At least there doesn’t seem to be built in support for it? How should this be done?

Additionally I would like once a marker appears to either be able to update only by tapping again at other place on the chart (simple solution) or temporarily disabling the panning such that this gesture only moves the marker and not the chart (preferred, but probably less simple solution). So tapping on the chart would enter “marker mode” which disables zooming and panning and some other gesture – e.g. using an external button on the chart, would leave “marker mode” and enter zoom/pan mode again.

Any ideas how to achieve this? Thanks in advance!

P.S. I’m also using a real time chart, though this probably doesn’t make a difference concerning this.

I would like to add scroll listener on x axis title. Is it possible to add scroll to axis title

In Xamarin.IOS when you set the legend to Horizontal and Top it will create a legend at the top then allow you to scroll horizontally to see all your LineSeries. In Xamarin.Android when you have more Series than can originally fit on the screen, the legend malfunctions and takes up the entire screen. Picture will be attached.

I set a rolloverModifier to a CandlestickSeries, but I can not find a API to hide RolloverMarker,I only find a article about WPF(https://www.scichart.com/documentation/v5.x/webframe.html#RolloverModifier.html)， how could I hide RolloverMarker or change the style of RolloverMarker in Android?

Hi,

I would like to display all the hours of the day in X axis e.g 01 to 24 and I haven’t been able to achieve it yet, I tried use date delta but I couldn’t figure out how it really works, could you please share a code snippet or some example.

Thanks

Hi,

Let me explain the structure of attached views. Default view state is https://imgur.com/a/zqAqpXp .

<VerticalViewPager>
    <FirstPagedFragment>
         <TradingViewFragment>
             <WebView />
         </TradingViewFragment>
         <SciChartFragment>
             <com.scichart.charting.visuals.SciChartSurface />
         </SciChartFragment>
    </FirstPagedFragment>
    <SecondPagedFragment> 
           ... 
    </ SecondPagedFragment>
</VerticalViewPager>

When FirstPagedFragment is dragged, SecondPagedFragment becomes displayed. You can see it on https://imgur.com/a/2VqZ1HY

The problem is the chart becomes disappeared when ViewPager is on changing state. Here is another link : https://imgur.com/a/xDO6Xtx

It is happened on [Samsung Galaxy S9, API 26] and [Xiaomi Mi A1, API 25] and I did not update displayMetric of chart.
Is there any configuration to fix this issue? Thanks.

All images are attached.

Hi,

I have a list of 12 items, but at the start I only want to see the last 6 items on the chart (stacked column chart). I want to be able to scroll / drag to reveal the first part of the list. I use the index of the list for the x-axis, so the list has indexes with range from [0, 11]

I’m having some weird behaviour implementing this.
When the data is loaded, i see the complete bars:

but when I start to scroll, i’m never able to reveal the complete bars anymore:
![Screenshot 2020-09-18 at 11.04.40.png][2]
![Screenshot 2020-09-18 at 11.04.59.png][3]

When i start scrolling to the end (although the chart is already at the end), the UI jumps and only shows half a bar. Also when i scroll to the beginning, it only shows half a bar.

How can I make sure I always see the complete bars?

This is the code, specific to the x axis & the scrolling:

val xAxis = sciChartBuilder.newNumericAxis()
            .withDrawMajorBands(false)
            .withDrawMajorGridLines(false)
            .withDrawMinorGridLines(false)
            .withDrawMinorTicks(false)
            .withMajorDelta(1.0)
            .withMinorDelta(0.2)
            .withAutoTicks(false)
            .withVisibleRange(5.5, 11.5)
            .build()

using half values for the range seems to be the only way I can see the full bars. Once I start scrolling I only see half bars at the start & end

val surfaceChartModifiers: ChartModifierCollection = chart.chartModifiers
val dragModifier = XAxisDragModifier()
dragModifier.dragMode = AxisDragModifierBase.AxisDragMode.Pan
surfaceChartModifiers.add(dragModifier)

val zoomPanModifier = ZoomPanModifier()
zoomPanModifier.clipModeX = ClipMode.ClipAtExtents
zoomPanModifier.direction = Direction2D.XDirection
zoomPanModifier.zoomExtentsY = false
surfaceChartModifiers.add(zoomPanModifier)

I hope you can help me I have managed to change the font color, size, but I do not know how to put the annotation with underlined font, who could give me a clue please. I would like to get something like what is shown in the image I attached. Thanks in advance.

Hi,

Can you please tell me do you have tool like https://www.scichart.com/documentation/win/current/webframe.html#Fibonacci%20Retracement%20Drawing%20Tool.html
on Android?
If not, please give me a sample code on how to implement this with scichart.
Thanks in advance.

Regards,
Batyr

Hi
Is there a way to just change the values of the pie segments so it get updated on the donut chart.
If I remove and add the pie segments again it works, is this the correct way?

Also I can’t find any documentation around the donut for android/xamarin

regards
Per

Hi, I want to draw a chart like the attached image.

This is a chart with XyDataSeries, it show as vertical line at each data point and verticle line is a dotted line in order to separated from other series.
Since the OHLC chart will have the open, close on the data point and an impulse chart is forced to draw from an axis, is there any better way that can achieve a series like this? Thank you!

I have a question about the scichart performance. I need to display a lot of data on the real time chart and above 2400000 values the chart crops and reacts very slowly. It was tested on Samsung s7. Does scichart handle that much data on devices? Is there any minimum phone performance requirements?

I hope you can help me, please. Is it possible to remove the lines that protrude on the edge of the graphics, as shown in the image? If so, what would be the procedure?

Thank you very much in advance…

Hi, i want to make something like that : https://i.ibb.co/617TmD2/screenshot-line.png

I have tried HorizontalLineAnnotation but i successed to have it only on bottom graph : https://i.ibb.co/qsCjjGd/screen-bot-graph.png

Here how i initialize my top graph :

@Override
public void initGraph(Context context) {
    Log.d(TAG, "initGraphs");
    SciChartSurface spectogramSciChart = new SciChartSurface(context);
    spectogram.addView(spectogramSciChart);

    xAxis = new NumericAxis(context);
    xAxis.setAutoRange(AutoRange.Always);
    xAxis.setDrawMinorTicks(false);
    xAxis.setDrawMajorBands(false);
    xAxis.setDrawMinorGridLines(false);
    xAxis.setAxisAlignment(AxisAlignment.Left);
    xAxis.setFlipCoordinates(true);
    xAxis.setAxisTitle("Frequences (KHz)");
    xAxis.setAxisTitleOrientation(AxisTitleOrientation.VerticalFlipped);
    spectogramSciChart.getXAxes().add(xAxis);


    yAxis = new NumericAxis(context);
    yAxis.setVisibleRange(new DoubleRange(startSpectrogramRange, endSpectrogramRange));
    yAxis.setDrawLabels(false);
    yAxis.setDrawMinorTicks(false);
    yAxis.setDrawMajorBands(false);
    yAxis.setDrawMinorGridLines(false);
    yAxis.setAxisAlignment(AxisAlignment.Bottom);
    yAxis.setFlipCoordinates(true);
    yAxis.setAxisTitleOrientation(AxisTitleOrientation.Horizontal);
    spectogramSciChart.getYAxes().add(yAxis);

    FastUniformHeatmapRenderableSeries f = new FastUniformHeatmapRenderableSeries();
    scichartTools.getSpectrogramDS().setStartX(0f);
    scichartTools.getSpectrogramDS().setStepX(0.9f);
    f.setDataSeries(scichartTools.getSpectrogramDS());
    f.setMaximum(100);
    f.setMinimum(-30.0);
    f.setColorMap(new ColorMap(
            new int[]{ColorUtil.Transparent, ColorUtil.DarkBlue, ColorUtil.Purple, ColorUtil.Red, ColorUtil.Yellow, ColorUtil.White},
            new float[]{0f, 0.0001f, 0.25f, 0.50f, 0.75f, 1f}
    ));

    spectogramSciChart.getRenderableSeries().add(f);
    scichartTools.getSpectrogramValues().setSize(scichartTools.getFftSize() * scichartTools.getBatchSize() * 2);

    // I add the line but it's not displayed
    HorizontalLineAnnotation horizontalLine = new HorizontalLineAnnotation(context);
    horizontalLine.setHorizontalGravity(Gravity.FILL_HORIZONTAL);
    horizontalLine.setY1(5f);
    horizontalLine.setLabelValue("Label");
    spectogramSciChart.getAnnotations().add(horizontalLine);
}

You can see at the bottom of the function that i added it, but it doesn’t work on this graph. Why ? Maybe the graph is drawing over my line ?

Thanks,
Best regards

Hello Friends,

I'm looking a solution where i can change Y-Axis range in between (0.1,0.2,0.4,0.6,0.8,1.0) .

I appreciate any help for above question

Thanks
Vasim

Hello!

We are using SciChart in our Android application, and our Crashlytics reports that it crashes:

Fatal Exception: java.lang.OutOfMemoryError
Failed to allocate a 4581372 byte allocation with 8664 free bytes and 8KB until OOM
dalvik.system.VMRuntime.newNonMovableArray (VMRuntime.java)
android.graphics.Bitmap.createBitmap (Bitmap.java:727)
com.scichart.drawing.utility.BitmapUtil.createFrom (SourceFile:46)
com.scichart.drawing.opengl.aa. (SourceFile:113)
com.scichart.drawing.opengl.n.createTexture (SourceFile:130)
com.scichart.drawing.common.AssetManagerBase.createTexture (SourceFile:158)
com.scichart.charting.visuals.rendering.a.a (SourceFile:84)
com.scichart.charting.visuals.rendering.a.a (SourceFile:54)
com.scichart.charting.visuals.rendering.RenderSurfaceRenderer.b (SourceFile:364)
com.scichart.charting.visuals.rendering.RenderSurfaceRenderer.a (SourceFile:357)
com.scichart.charting.visuals.rendering.RenderSurfaceRenderer.a (SourceFile:134)
com.scichart.charting.visuals.rendering.RenderSurfaceRenderer.onDraw (SourceFile:123)
com.scichart.drawing.opengl.RenderSurfaceGL$a.onDraw (SourceFile:228)
com.scichart.drawing.opengl.MyGLRenderer.b (SourceFile:293)
com.scichart.drawing.opengl.MyGLRenderer.onDrawFrame (SourceFile:277)
android.opengl.GLSurfaceView$GLThread.guardedRun (GLSurfaceView.java:1548)
android.opengl.GLSurfaceView$GLThread.run (GLSurfaceView.java:1259)

Can anyone help please?

Hello!
I’m trying to migrate OhlcDataSeries from Double to more accurate BigDecimal on Android.
But I faced with an issue that “GenericClass doesn’t support class”

How can I fix it?
I want to use BigDecimal with chart.

Thank you

Hi all,

Why the API’s for iOS, Android and WPF are not identically?
I have seen many samples on the forum, but to adapt it to a different platform is very hard.
A lot of classes are different for each platform.

• Is there any “comparison” for the different platforms?
• Is this planned to unify the API’s?

Regards
Urs

Hello Friends ,

   Sync two Chart in Android Bottom chart can be change on top chart touch

We are looking a solution where we want show two chart at Top and Bottom in Android Screen.based on Top chart changed by gesture /finger touch should be expend/shrink like zoom in and out bottom chart

Assume at top chart data range has between 0 to 3,00,000 , I want to capture in bottom chart only selected/touched part in with expanded form.

I have attached below screen shot which may be helpful.

Solution can be like this but not able to get code for this implementation

https://blog.scichart.com/content/images/2021/06/Navigate-ECG-strip-with-Pocket-ECM.gif

https://blog.scichart.com/android-app-to-view-long-term-ecg-signals/

I appreciate any help regarding this issue.

can you please provide me source code (XML as well as Java) for the medical app. I have seen ECG example code but it is only for ECG. I want to show all parameters diplayed in pic.

In financial markets, there is a type of chart that is as follows.

I did not find this type of chart in SciChart.

Please help me how to draw this chart

We’d like to customize the look of our legends. We have 4 legends displaying different data, but right now the only thing we can change is the Theme. Is there any way to customize the legend items, like add some icons, change the point marker shape and size, change the check box icon etc…

P.S.: I’m not a trial user. We have an iOS, Android and WPF licenses purchased.

Project info:
Xamarin.Android
SciChart.Android 2.2.2.854

Version
2.2.2.854

I’m evaluating chart libraries to my next project and I’m trying to do a simple chart like the one in the attached image.
It was actually very easy to do it using MPAndroidChart, however it’s been hard to do a simple task like put a label aligned with the column… I did take a look into the SciChart sample application, but the application just uses numeric labels…
Can someone provide some guidance of how to do this?

Hi !
Is it possible to display the RollOverModifier tooltip on the real points only ? Say I have points (1 1) and (3 3) in my chart and I don’t wan’t the tooltip to display (1.5 1.5), (2 2), (2.5 2.5) etc. when rolling over… Any idea ?

Thank you,

Adrien

So I am trying to set paddings on the chart, so that the data series do not touch chart edges

I can’t do it with View’s method setPadding because then the black background is present (screenshot shows padding on all sides but I need just left and right)

Also, I managed to achieve no labels, axes, grids etc. but in totally hacky way; I set .withIsCenterAxis and then all other things to false

 .withAxisId(Y_AXIS_ID)
        .withDrawMajorBands(false)
        .withDrawMajorGridLines(false)
        .withDrawMinorGridLines(false)
        .withDrawLabels(false)
        .withIsCenterAxis(true)
        .withDrawMajorTicks(false)
        .withDrawMinorTicks(false)

Is there a normal way of doing this?

thanks

Hello,

At right chart we have show only one X-axis which needs to update in real time .whenever new values will come we have to update in X-axis in itself instead of adding new line at X-Axis.

Each time New Y – axis will come that will append at left chart (Can be consider left chart showing history of right chart)

Let me know if anything further requred

Thanks.

Hi,

I’m evaluating SciChart for use in a production app.

Is there any way to log exceptions generated by SciChart? Currently I’m logging all handled and unhandled exceptions in my app to my server so that issues can be flagged without users having to manually submit support tickets. SciChart is printing internal exceptions to console – is there any way to override that with our own error handling mechanism? If not, how should we monitor for production errors generated internally by SciChart?

Thanks

Hi
I have a line chart that has already been drawn and synced with a sound.
when we play sound, chart begin to scroll horizontally.
but problem is lagging when scrolling chart.
Is there a way to fix this problem?

private Runnable mRunnable = new Runnable() {
    @Override
    public void run() {
        forceRunInPauseMode = false;

        getActivity().runOnUiThread(() -> {
            currentTime = (int) exoPlayer.getCurrentPosition();
            binding.tvCurrentDuration.setText(MiliToTimeConverter.milliToTime(currentTime));
        });

        int currentRange = currentTime * 2;


        if (!isDraw) {
            DoubleValues xValues = new DoubleValues(Arrays.copyOfRange(xDoubleArray, 0, xDoubleArray.length - 1));
            DoubleValues yValues = new DoubleValues(Arrays.copyOfRange(yDoubleArray, 0, yDoubleArray.length - 1));
            DoubleSeries doubleSeries = new DoubleSeries(xValues, yValues);
            lineData.append(doubleSeries.getxValues(), doubleSeries.getyValues());
            isDraw = true;
        }
        xVisibleRange.setMinMax(currentRange - visibleInterval / 2, currentRange + visibleInterval / 2);
    }
};

private void updateChart() {
    schedule = scheduledExecutorService.scheduleWithFixedDelay(() -> {
        if (!isPlaying && !forceRunInPauseMode)
            return;
        UpdateSuspender.using(binding.sciChart, mRunnable);
    }, 0, TIME_INTERVAL, TimeUnit.MILLISECONDS);
}


private void pause() {
    exoPlayer.setPlayWhenReady(false);
    binding.ivPlay.setImageResource(R.drawable.ic_play);
    if (schedule != null)
        schedule.cancel(false);
}

private void initSciChart() {

    isChartConfigured = true;
    SciChartBuilder.init(getContext());
    binding.sciChart.setBackgroundColor(getResources().getColor(R.color.colorTransparent));

    // Obtain the SciChartBuilder instance
    SciChartBuilder mSciChartBuilder = SciChartBuilder.instance();

    //set border style
    binding.sciChart.setRenderableSeriesAreaBorderStyle(null);

    xVisibleRange = new DoubleRange();

    // Create a numeric X axis
    final IAxis xAxis = mSciChartBuilder.newNumericAxis()
            .withVisibleRange(xVisibleRange)
            .withGrowBy(new DoubleRange(0.25d * visibleInterval / totalDuration, 0.25d * visibleInterval / totalDuration))
            .withAutoRangeMode(AutoRange.Never)
            .build();

    final IAxis yAxis = mSciChartBuilder.newNumericAxis()
            .withVisibleRange(-1d, 1d)
            .withAutoRangeMode(AutoRange.Never)
            .build();

    xAxis.setVisibleRangeChangeListener((iAxisCore, oldRange, newRange, isAnimating) -> {
        if (!isPlaying) {
            double c = ((newRange.getMinAsDouble() + newRange.getMaxAsDouble()) / 4);
            getActivity().runOnUiThread(() -> binding.tvCurrentDuration.setText(MiliToTimeConverter.milliToTime((long) c)));
        }
    });


    xAxis.setDrawMajorGridLines(false);
    xAxis.setDrawMinorGridLines(false);
    xAxis.setDrawMajorBands(false);
    xAxis.setDrawMajorTicks(true);
    xAxis.setDrawMinorTicks(true);
    xAxis.setTickProvider(new CustomTickProvider());
    xAxis.setMaxAutoTicks(MAX_AUTO_TICKS);
    xAxis.setMinorsPerMajor(MINOR_PER_MAJOR);
    xAxis.setVisibility(View.GONE);


    yAxis.setDrawMajorGridLines(false);
    yAxis.setDrawMinorGridLines(false);
    yAxis.setDrawMajorBands(false);
    yAxis.setDrawMajorTicks(false);
    yAxis.setDrawMinorTicks(false);
    yAxis.setTickProvider(new CustomTickProvider());
    yAxis.setMaxAutoTicks(MAX_AUTO_TICKS);
    yAxis.setMinorsPerMajor(MINOR_PER_MAJOR);
    yAxis.setVisibility(View.GONE);


    VerticalLineAnnotation verticalLine = mSciChartBuilder.newVerticalLineAnnotation()
            .withX1(0.5)   // black
            .withStroke(new SolidPenStyle(ColorUtil.argb(250, 120, 126, 136), true, 1f, null))
            .withCoordinateMode(AnnotationCoordinateMode.RelativeX)
            .build();

    ModifierGroup chartModifiers = mSciChartBuilder.newModifierGroup()
            .withModifier(new GestureModifierBase() {
                @Override
                public void detach() {
                    super.detach();
                }

                @Override
                public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
                    return false;
                }

                @Override
                public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
                    // Scroll X
                    xAxis.scroll((-distanceX/2), ClipMode.ClipAtExtents);

                    return true;
                }
            })
            .build();

    lineData = mSciChartBuilder.newXyDataSeries(Double.class, Double.class).build();
    XyDataSeries staticData = mSciChartBuilder.newXyDataSeries(Double.class, Double.class).build();

    final FastLineRenderableSeries lineSeries = mSciChartBuilder.newLineSeries()
            .withDataSeries(lineData)
            //.withPointMarker(mSciChartBuilder.newPointMarker(new EllipsePointMarker()).withSize(7, 7).withStroke(0xFF006400, 1).withFill(0xFFFFFFFF).build())
            .withPaletteProvider(new XYCustomPaletteProvider(ColorUtil.argb(255, 50, 153, 0))) // green
            .withStrokeStyle(ColorUtil.argb(250, 120, 126, 136), 1f, true) // black
            .build();

    final IRenderableSeries staticLineSeries = mSciChartBuilder.newLineSeries()
            .withDataSeries(staticData)
            .withPaletteProvider(new XYCustomPaletteProvider(ColorUtil.argb(255, 50, 153, 0))) // green
            .withStrokeStyle(ColorUtil.argb(250, 120, 126, 136), 1f, true) // black
            .build();

    DoubleValues xValues = new DoubleValues(Arrays.copyOfRange(xDoubleArray, 0, totalRange));
    DoubleValues yValues = new DoubleValues(Arrays.copyOfRange(yDoubleArray, 0, totalRange));
    DoubleSeries doubleSeries = new DoubleSeries(xValues, yValues);

    binding.sciChart.getRenderableSeries().add(lineSeries);
    binding.sciChart.getRenderableSeries().add(staticLineSeries);

    binding.sciChart.setRenderSurface(new RenderSurface(getContext()));

    Collections.addAll(binding.sciChart.getYAxes(), yAxis);
    Collections.addAll(binding.sciChart.getXAxes(), xAxis);
    Collections.addAll(binding.sciChart.getChartModifiers(), chartModifiers);
    Collections.addAll(binding.sciChart.getAnnotations(), verticalLine);

    staticData.append(doubleSeries.getxValues(), doubleSeries.getyValues());
    lineData.setAcceptsUnsortedData(true);

    begin();
}