Category: Android

Hi,
I am using Sci Chart android I want to Share/Link Custom Modifier on Multiple Charts ,
How Can i do that?

I’m seeing the following exception:

E/Exception: null
    java.lang.ArrayIndexOutOfBoundsException: length=0; index=-1
        at com.scichart.core.model.DoubleValues.get(SourceFile:167)
        at com.scichart.charting.numerics.tickProviders.LogarithmicNumericTickProvider.updateTicks(SourceFile:94)
        at com.scichart.charting.numerics.tickProviders.TickProvider.update(SourceFile:59)
        at com.scichart.charting.numerics.tickProviders.DeltaTickProvider.update(SourceFile:81)
        at com.scichart.charting.visuals.axes.AxisBase.onUpdateMeasure(SourceFile:957)
        at com.scichart.charting.visuals.axes.AxisBase.updateAxisMeasurements(SourceFile:936)
        at com.scichart.charting.layoutManagers.RightAlignmentOuterAxisLayoutStrategy.measureAxes(SourceFile:39)
        at com.scichart.charting.layoutManagers.DefaultLayoutManager.onLayoutChart(SourceFile:235)
        at com.scichart.charting.visuals.rendering.RenderSurfaceRenderer.a(SourceFile:207)
        at com.scichart.charting.visuals.rendering.RenderSurfaceRenderer.a(SourceFile:132)
        at com.scichart.charting.visuals.rendering.RenderSurfaceRenderer.onDraw(SourceFile:123)
        at com.scichart.drawing.opengl.RenderSurfaceGL$a.onDraw(SourceFile:234)
        at com.scichart.drawing.opengl.MyGLRenderer.b(SourceFile:299)
        at com.scichart.drawing.opengl.MyGLRenderer.onDrawFrame(SourceFile:283)
        at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1571)
        at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1270)

I’m initializing my chart as follows:

SciChartBuilder.init(context)
builder = SciChartBuilder.instance()

...

val xAxis = builder.newCategoryDateAxis()
                            .withGrowBy(0.0, 0.05)
                            .withAxisAlignment(AxisAlignment.Bottom)
                            .withVisibleRange(sharedXRange)
                            .withDrawMinorGridLines(true)
                            .withDrawMajorGridLines(true)
                            .build()
val yAxis = builder.newLogarithmicNumericAxis()
                            .withTextFormatting("#.#E+0")
                            .withScientificNotation(ScientificNotation.LogarithmicBase)
                            .withLogarithmicBase(2.0)
                            .build()
val seriesData = builder.newXyDataSeries(Date::class.java, Double::class.javaObjectType)
                            .withSeriesName("Series A")
                            .build()
seriesData.append(data.dateData, data.yData)
series = builder.newLineSeries()
                            .withDataSeries(seriesData)
                            .build()

UpdateSuspender.using(surface) {
                Collections.addAll(surface.xAxes, xAxis)
                Collections.addAll(surface.yAxes, yAxis)
                Collections.addAll(surface.renderableSeries, series)
}

data object has about 300 valid data points.

Any ideas what’s going on? I tried running this on a new activity. If I swap LogarithmicNumericAxis for a NumericAxis, everything works fine. I looked at the decompiled .class file where the crash was occurring (I don’t have the source for SciChart), and it seems like the crash occurs when major ticks fail to get generated (majorTicks.size == 0). I tried disabling all minor/major ticks but no joy.

for(int var22 = majorTicks.size(); var22 >= 0; --var22) {
            double var23 = var4.fromExponent(var11);
            double var25 = var22 < majorTicks.size() ? majorTicks.get(var22) : majorTicks.get(var22 - 1) * var23;

Hi;

When I open Scichart for the first time, the chart view looks black until it is displayed by drawing the chart.
Is it possible to make the background in a different color until the chart is displayed?

Tnx.

I’m using boxAnnotation Object with some properties

I use
.withDragDirections(Direction2D.XDirection)
.withResizeDirections(Direction2D.XDirection)
for resize and drag only x direction

It looks like drag and resize only x direction but the box resize y direction a little bit

I do not use any special properties using boxAnnotation

use of course .withIsEditable for editing
.withPosition, .withBackgroundDrawableId
that’ it

and I also wonder when i declare new CustomIResizingGrip object with new Canvas

why withDragDirections, withResizeDirections dont work?

I am developing an application which can receive the data from an ECG circuit, then transmit that data through Bluetooth into my phone application. My phone application would then display the ECG graph. I tried downloading the ECG demo example and it works find on its own. I am trying to incorporate that into my own project and see if it works. However I have been getting errors. Please help me out! 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?

Hello!
There is interesting situation when I’m trying to show volumes on charts in my application. On the first screen you can see that on the left side of the image there is height values of volumes (the data is between 2.000.000 and 5.000.000), on the other side are low (they are between 0 and 100.000 in true values and hardcoded in my sample). It looks like correct because of low vaues, but when i’m scrolling screen to the later data (seconds screenshot), it “jumps” and displays with full-size (on image I’m hardcoded values for 3.000.000, so that’s why they are equals).
When data is hardcoded for 3.000.000 I think it should be closer to the preveous “true” values which are on the left side, but they are not.
It looks like the bottom side of the candles extruding them.
What is the reason of this behaviour? How can I correctly display this data?

Thank you!

Hi,

I was using android sdk 2.5 and i’m not getting any runtime errors and error logs. But after updating the project to sdk 3.0 i started getting errors (no code has been changed). During the runtime, chart’s xAxis shows wrong times and started writing 1970 under every vertical grid line. Also debug log says: “SciChartSurface has no XAxes. Please ensure SciChartSurface.XAxis is set, or SciChartSurface.XAxes has at least one axis”.

I’m just upgrade sdk 2.5 to 3.0, how can i fix errors?

Tnx.

I have a few problems that I’m trying to address with y-axis labelling.

1. I am including a y-axis on the left side of my graph but want the text of the labels to be right-aligned. Each label uses two lines of text. How can I do that?
2. I want the margin of the text to be a specific width so that I can line up the y-axis of multiple scichart surfaces that are stacked vertically. How can I set each of my scichart surfaces to use a particular margin for the y-axis labelling?
3. The y-axis label text will wrap when I don’t want it to (see attached image — The text of the label should be “1m \n Left” and I am currently seeing “1m \n Lef \n t”). How do I turn off the wrapping of text on the y-axis?

———-

This is how I am currently implementing the y-axis:

NumericAxis(context).apply {
    drawLabels = true
    axisAlignment = AxisAlignment.Left
    this.labelProvider = labelProvider
    this.tickProvider = tickProvider
    drawMajorBands = false
    drawMajorTicks = false
    drawMinorTicks = false
    drawMajorGridLines = false
    drawMinorGridLines = false
    isLabelCullingEnabled = false
    visibleRange = DoubleRange(
            dataRange.first,
            dataRange.second
    )
    autoRange = AutoRange.Never
    tickLabelStyle = FontStyle(
            TypefaceManager.obtainTypeface(context, CustomTypeface.PROXIMA_NOVA_REG),
            context.resources.getDimension(R.dimen.results_screen_graph_labels_text_size),
            Color.LTGRAY
    )
}

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.

In the picture below you can see that upday bar can be:
1. open in the left
2. close in the right
3. close is greater then open

As you can see in the screenshot I have different behavior

I’m trying to add custom layout to the tooltip modifier ,but i couldn’t find the solution , also i would like to change the crosshair type behavior on the tool tip ,instead of that i would like to add my own style

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

When I work with the 2D Android Heatmap Chart, I want to draw a frame on the borders of the cells. Is this possible?

Thanks already for your help.

Dear Sir,

Warm Greetings!
Sir, could you give some tips how we can draw circle or ellipse in the SciChart?

Your swift reply will be deeply appreciated.

Thank you and kind regards,

Team Solmitech

I am using SCICHART in my project on Xamarin.Android, but the default them show some themes but I would like to change the background grid color of the reports. Please any can help me ?.

When I import my own .jar library after importing Scichart .aar libraries(core and data) my own .jar library generates an error(Error: findLibrary returned null). How can I overcome that error.

Hi,

I just downloaded SciChart for Android. Trying to get the Example to work.

I’ve put my trial key in SciChartApp.java and tried to run.

Here are the errors (screen shot attached).

Thank you,
Ed

Hi,

I have a valid license key for development. But occasionally the charts show the message below and I have to restart the app to avoid that. May I ask is there a reason for that and how to fix it?

"Sorry! You have not set a License Key. You can request a free trial key from www.scichart.com/licensing-scichart-android or purchase at store.scichart.com."

Thanks,
Gang

When I insert a series of data, the hollow K diagram shows the error, and a line is displayed in the middle

ohlcSeries.insertRange(0,date,open,high,low,close);

My Settings are as follows：

candlestickSeries = sciChartBuilder.newCandlestickSeries()
            .withStrokeUp(UP_COLOR)
            .withStrokeDown(DOWN_COLOR)
            .withDataSeries(ohlcSeries)
            .withFillDownColor(0xFFFFFFFF)
            .withFillUpColor(UP_COLOR)
            .build();

How can I solve this problem?Please see the attachment for details。

I have this strict mode configuration:

StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
            .detectDiskReads()
            .detectDiskWrites()
            .detectNetwork()
            .penaltyLog()
            .build());

StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
            .detectLeakedSqlLiteObjects()
            .detectLeakedClosableObjects()
            .penaltyLog()
            .penaltyDeath()
            .build());

I have an error when I rotate screen:

 03-15 09:40:24.215 29914-29923 E/StrictMode: A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks.
   java.lang.Throwable: Explicit termination method 'release' not called
       at dalvik.system.CloseGuard.open(CloseGuard.java:223)
       at android.view.Surface.setNativeObjectLocked(Surface.java:554)
       at android.view.Surface.<init>(Surface.java:187)
       at com.scichart.drawing.opengl.ac.<init>(SourceFile:69)
       at com.scichart.drawing.opengl.n.createCanvasTexture(SourceFile:140)
       at com.scichart.charting.visuals.axes.AxisTickLabelsRendererComponent.onDraw(SourceFile:120)
       at com.scichart.charting.visuals.axes.AxisTickLabelsRendererComponent$HorizontalAxisTickLabelsRendererComponent.onDraw(SourceFile:278)
       at com.scichart.charting.visuals.axes.f.onDraw(SourceFile:182)
       at com.scichart.charting.visuals.axes.AxisBase.onDraw(SourceFile:866)
       at com.scichart.charting.visuals.rendering.RenderSurfaceRenderer.a(SourceFile:491)
       at com.scichart.charting.visuals.rendering.RenderSurfaceRenderer.g(SourceFile:485)
       at com.scichart.charting.visuals.rendering.RenderSurfaceRenderer.a(SourceFile:359)
       at com.scichart.charting.visuals.rendering.RenderSurfaceRenderer.a(SourceFile:134)
       at com.scichart.charting.visuals.rendering.RenderSurfaceRenderer.onDraw(SourceFile:123)
       at com.scichart.drawing.opengl.RenderSurfaceGL$a.onDraw(SourceFile:228)
       at com.scichart.drawing.opengl.MyGLRenderer.b(SourceFile:299)
       at com.scichart.drawing.opengl.MyGLRenderer.onDrawFrame(SourceFile:283)
       at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1571)
       at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1270)

Hello there. I am very novice compared to you. As soon as I press a button in the main activty, what should I do to see the data set that I have determined before on the screen?

Thank you from now.

MainActivity code part:

        btn1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            mdata = new double[][]{
                    {3, 2, -1.97, -2.81, -0.33, 1.53, 2.04, 2-.08, -1.94, -1.42, -1.58},
                    {-1.77, -1.76, 1.1, 0.26, -0.72, -0.64, -3.26, -3.2, -3.1, -1.94, -1.54},
                    {0, 0, 0, 0, 0, -3.7, -3.7, -3.7, -3.7, 0.48, 0.48},
                    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
            };

            final Camera3D camera = sciChart3DBuilder.newCamera3D().withPosition(-1300, 1300, -1300).build();

            final NumericAxis3D xAxis = sciChart3DBuilder.newNumericAxis3D().withMaxAutoTicks(7).build();
            final NumericAxis3D yAxis = sciChart3DBuilder.newNumericAxis3D().withVisibleRange(-4d, 4d).build();
            final NumericAxis3D zAxis = sciChart3DBuilder.newNumericAxis3D().build();
            final int xSize = 11;
            final int zSize = 4;

            final UniformGridDataSeries3D<Double, Double, Double> ds = new UniformGridDataSeries3D<>(Double.class, Double.class, Double.class, xSize, zSize);
            ds.setStartX(0d);
            ds.setStepX(0.09);
            ds.setStartZ(0d);
            ds.setStepZ(0.75);

            for (int z = 0; z < zSize; z++) {
                for (int x = 0; x < xSize; x++) {
                    ds.updateYAt(x, z, mdata[z][x]);
                }
            }
        }
    });

Hello,
is it possible to modify the corner radius of tooltips in SciChart Android?

How to reduce size of colored rectangle of the legends ?

Hello, I’m using rollover modifier. By default data label is in first line, and data value is in second line. How can I modify it to have label and value in single line?

I want to maintain shape of scichart minor and major grids as square as shown in image below how can I do that?

This is stackTrace:
E/Axis: VisibleRange was restored to its last valid value. The range class com.scichart.data.model.DoubleRange (Min = 27748.0, Max = 32248.0) either is not valid or it doesn’t satisfy MinimalZoomConstrain or MaximumZoomConstrain. To provide fallback value please override AxisCore#coerceVisibleRange(IRange) method

Hello to everyone.

Is it possible to draw the 2d heatmap chart output that appears in pixel shape smoothly? Is there any way to solve this with the current library?

Hi,
I want to implement a chart that represent currency changed rate, so that the chart will show a rise with a green point and a fall with a red point.

in the image I’ve uploaded I’ve used Custom PaletteProvider to manipulate the colors accordingly.

what I want to implement is instead of coloring the Point (Ellipse) I want to load an Image.
the closest i’ve got is to load a single image to all the points, without theme changing (red or green) accordingly.

I did managed to implement that exact behavior in iOS.

how could I implement a dynamically changing Sprits in a PaletteProvider ?

Thanks in advance…