Questions

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?

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!
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

Referring to the stacked column side by side example in the android examples collection, if someone clicks on a column/series in that chart, how could i identify which the of columns has been selected (usa, china, india, etc).

I’ve attached example code where setting “majorTickLineLength” appears to have no effect on the length of the major tick lines. I’m trying to make them shorter than the default (half the length). How can I adjust the length of these tick lines?

I am extending a PieSegmentLabelFormatterBase to format the segment label of a piechart. however I cannot find any information regarding how I can change its size. So my question is How can I change the font size of piechart labels?

using android scichart with two surfaces vertically on the screen, that is one above the other, same width. I wish to match the width of the X axis on both. when the labels of the Y axis are formatted differently the X axis may change overall width. I suppose there could be two approaches,
1) fix or match the width of the X axis
2) fix or match the width of the Y axis labels

which is the simplest? and where can I learn more?

Hello,

I am wanting to “force” an axis label on a specific value. For example, right now in my datetime graph it always shows a “5PM” time on the axis regardless of the data. Instead, I would like to “anchor” the axis ticks on a different time value, like local Noon. We were able to do this in our previous charting solution, but I have not yet figured out how to do it with SciChart.

Thank you.

Hi,

I’d like to enable AnnotationCreationListener with a toggle button pressed down, and disable it with the button released. It’s different from the Android sample code in Create Annotation Dynamically. I have a few questions when I’m trying to code. I’m not sure if my approach is on the right track. Please advise, thanks.

// insert button listener
    insertAnnotationButton = findViewById(R.id.annotationInsertButton);
    insertAnnotationButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            // TODO: add chartmodifier/annotationCreationModifier when button pressed down
            if (insertAnnotationButton.isChecked()) {
                annotationCreationModifier.setAnnotationType(???); // how to set type to vertical line annotation?
                DefaultAnnotationFactory annotationFactory = new DefaultAnnotationFactory();
                annotationFactory.setFactoryForAnnotationType(DefaultAnnotationFactory.VERTICAL_LINE_ANNOTATION, new IAnnotationFactory() {
                    @NonNull
                    @Override
                    public IAnnotation createAnnotation(@NonNull ISciChartSurface parentSurface, int annotationType) {
                        return sciChartBuilder.newVerticalLineAnnotation().withIsEditable(true).withStroke(1, White).withVerticalGravity(Gravity.FILL_VERTICAL).build();
                    }
                });
                annotationCreationModifier.setAnnotationFactory(annotationFactory);
                annotationCreationModifier.setAnnotationCreationListener(new OnAnnotationCreatedListener() {
                    @Override
                    public void onAnnotationCreated(IAnnotation iAnnotation) {
                        // how to get X coordinate of the annotation and update my annotation variable

                    }
                });
                ecmSurface.getChartModifiers().add(sciChartBuilder.newModifierGroup().withModifier(annotationCreationModifier)..build());
            } else {
                // how to remove annotationCreationModifier from ChartModifiers?
                ecmSurface.getChartModifiers().remove(???);
            }
        }
    });

Hello,

I’m trying to figure out how to apply a consistent gradient to the areas underneath my line charts. For example, if I have chart with Y values 0-10, I might want the area corresponding to 0 to be white, and 10 to be black, regardless of what values are currently panned or zoomed onto the screen. From what I have seen so far, SciChart gradients are based on the current screen values, so if I were zoomed into an area that was only 0-5, it would should a white to black gradient (not what I want), whereas I need a white to grey variant (reserving the black for 10’s). I hope that makes sense.

Thank you.

How to move date labels to the middle of the day ?

val xAxis = DateAxis(applicationContext).apply {
        drawLabels = true
        autoFitMarginalLabels = true
        axisTitle = "X Date Axis"
        axisAlignment = AxisAlignment.Bottom
        drawMajorBands = false
        drawMinorGridLines = false
        drawMajorGridLines = true
    }

HI,

I’m trying to go through the “Your First App” tutorials

I’ve completed the first one:
“Creating your First SciChart Android App – Part 1”:
https://www.scichart.com/documentation/android/current/webframe.html#Creating%20your%20First%20SciChart%20Android%20App%20-%20Part%201.html

which seems fine.

I then go to
“Creating your First SciChart Android App – Part 2”:
https://www.scichart.com/documentation/android/current/webframe.html#Creating%20your%20First%20SciChart%20Android%20App%20-%20Part%202.html

Unfortunately, I don’t see the SciChart items in the Palette when I scroll down to the Custom section.

Could you point to how I can make SciChart available please?

Screen shots attached.

Thank you,
Ed

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

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
    )
}

Hello,

I get data from reading an URL so I save them (prepared) to a Arraylist (type PieSegment). How can I add the PieSegments from the Arraylist with (for example a loop) to my Piechart?

BR and thank you very much.
Marco

Hi everyone,

I’m working on a 2D chart on Android that requires the distance between major axes to be exactly 5 millimetres. How do I configure the major axis delta/ticks or resize the chart to meet my need?

Thank you.

Hello,

I want to use the MultiplePieDonutChart. Like in the example, I want to have a touch tooltip.
I tried it with that code:

LinearLayout chartLayout = (LinearLayout) root.findViewById(R.id.chart_layout);
SciChartLegend legend = root.findViewById(R.id.pieChartLegend);

    chartLayout.addView(surface);

    SciChartBuilder.init(MainMenu.getActivity());

    final SciChartBuilder sciChartBuilder = SciChartBuilder.instance();

    final IPieRenderableSeries pieSeries = sciChartBuilder.newPieSeries().withSeriesName("HowPeopleTravel").withSegments(
            sciChartBuilder.newPieSegment().withValue(34).withTitle("Ecologic").withRadialGradientColors(0xff84BC3D, 0xff5B8829).build(),
            sciChartBuilder.newPieSegment().withValue(34.4).withTitle("Municipal").withRadialGradientColors(0xffe04a2f, 0xffB7161B).build(),
            sciChartBuilder.newPieSegment().withValue(31.6).withTitle("Personal").withRadialGradientColors(0xff4AB6C1, 0xff2182AD).build()
    ).build();
    final IPieRenderableSeries donutSeries = sciChartBuilder.newDonutSeries().withSeriesName("DetailedGroup").withSegments(
            sciChartBuilder.newPieSegment().withValue(28.8).withTitle("Walking").withRadialGradientColors(0xff84BC3D, 0xff5B8829).build(),
            sciChartBuilder.newPieSegment().withValue(5.2).withTitle("Bicycle").withRadialGradientColors(0xff84BC3D, 0xff5B8829).build(),
            sciChartBuilder.newPieSegment().withValue(12.3).withTitle("Metro").withRadialGradientColors(0xffe04a2f, 0xffB7161B).build(),
            sciChartBuilder.newPieSegment().withValue(3.5).withTitle("Tram").withRadialGradientColors(0xffe04a2f, 0xffB7161B).build(),
            sciChartBuilder.newPieSegment().withValue(5.9).withTitle("Rail").withRadialGradientColors(0xffe04a2f, 0xffB7161B).build(),
            sciChartBuilder.newPieSegment().withValue(9.7).withTitle("Bus").withRadialGradientColors(0xffe04a2f, 0xffB7161B).build(),
            sciChartBuilder.newPieSegment().withValue(3.0).withTitle("Taxi").withRadialGradientColors(0xffe04a2f, 0xffB7161B).build(),
            sciChartBuilder.newPieSegment().withValue(23.2).withTitle("Car").withRadialGradientColors(0xff4AB6C1, 0xff2182AD).build(),
            sciChartBuilder.newPieSegment().withValue(3.1).withTitle("Motorcycle").withRadialGradientColors(0xff4AB6C1, 0xff2182AD).build(),
            sciChartBuilder.newPieSegment().withValue(5.3).withTitle("Other").withRadialGradientColors(0xff4AB6C1, 0xff2182AD).build()
    ).build();

    Collections.addAll(surface.getRenderableSeries(), pieSeries, donutSeries);
    Collections.addAll(surface.getChartModifiers(), sciChartBuilder.newLegendModifier(legend).withShowCheckBoxes(false).withSourceSeries(pieSeries).build(), new PieChartTooltipModifier());

But if I touch on the chart I didn’t get the tooltip. As you see I have nearly copy all the code of the Example but I do not work. Where is my fault?

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 used box annotation like pic
in a boxAnnotation I used

.withIsEditable(true)
.withPosition(1,-2, 0, 2)
.withBackgroundDrawableId(R.drawable.example_box_annotation_background_4)
.withResizingGrip(customIResizingGrip)
.withAnnotationDragListener(customIAnnotationSelectionDrawable)
.withResizeDirections(Direction2D.XDirection)
.withDragDirections(Direction2D.XDirection)
.build();

and i made a 2 box like pic

i use box for drag one side to make a box big or small

the first box which is left doesn’t move anywhere.
it just can only drag that i want
but the second box, the box moves when i drag after first touch
the left box never moves on but right box moves first drags
just move first time not sometimes

am i wrong something?

Hello.

I’m trying to modifying Audio Analyzer Example.

This is scenario.

1. Read wav file
2. Calculate FFT (for all sample data of wav file)
3. Display FFT result to FFT & Spectrogram chart.

The point is this : read all data at once and calulate FFT for dispaly in chart.

I already have FFT result with re[] and im[] type arrays.

1. When I setting up X,Y axis of FFT chart, following code applied.
   Q. x,y axis and value setup is correct?

               // prepare fft input (dataF is float type sample data of wav file)
               double[] re = new double[dataF.length];
               double[] im = new double[dataF.length];
               double[] mag = new double[dataF.length];
               for(int ii=0; ii<dataF.length; ii++) {
                   re[ii] = (double)dataF[ii];
                   im[ii] = 0.0d;
               }
   
               FFTf.transform(re, im);  // using Bluestein DFT algorithm.
   
               for(int nn=0; nn < re.length; nn++) {
                   mag[nn] = Math.sqrt(re[nn] * re[nn] + im[nn] * im[nn]);
                   if(nn <= 10 || re.length - 10 <= nn)
               }
   
               // setup fft and x,y values
               for(int l=0; l < re.length/20; l++) {
                   fftDS.append((1.0*l*sampleRate/re.length), Math.sqrt(re[l] * re[l] + im[l] * im[l]));
               }
   

2. When I setting up X,Y axis of Spectrogram chart, following code applied.
   Q. x,y axis and value setup is correct?

               fftCount = dataProvider.getAudioDataByteSize() / 4096;
               spectrogramDS = new UniformHeatmapDataSeries<>(Long.class, Long.class, Double.class, re.length/20, fftCount);
               fftOffsetValueCount = (re.length/20)*fftCount - (re.length/20);
               spectrogramValues = new DoubleValues((re.length/20)*fftCount);
               spectrogramValues.setSize((re.length/20)*fftCount);
   
               // update spectrogram chart data
               for(int jj=0; jj < fftCount; jj += 4096) {
                   double[] spectrogramItems = spectrogramValues.getItemsArray();
                   double[] fftItems = getFrom(mag, 4096, jj);
   
                   System.arraycopy(spectrogramItems, re.length/20, spectrogramItems, 0, fftOffsetValueCount);
                   System.arraycopy(fftItems, 0, spectrogramItems, fftOffsetValueCount, re.length/20);
   
                   spectrogramDS.updateZValues(spectrogramValues);
               }
   

FFT chart is working but Spectrogram is not.

Thank you for your help!

How do I know when user edited the text on TextAnnoation so the app can save it?
How to do the same for https://www.scichart.com/questions/wpf/get-textannotation-text-after-user-editing for Android and iOS version of SciChart?

Hello,

I would try out the examples with my trial but I got this error:

error: package io.reactivex does not exist import
io.reactivex.Observable;

I hope you can help me. Thank you.

BR
Marco

PS.: I did everything like in the Tutorial

want to show error marker in line series if data point is bad (isGoodValue=false). how to set metadata in android series

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 wanna use vertical line annotation in box annotation that only one edge moves to drag like using ‘chart drag area to zoom’

I checked about custom annotation and there’s features said ‘common features of annotations’ but they don’t have any features l’m looking for

i put pictures for understanding.

there are box annotation on a graph and I want to move line to drag and box is going to smaller or larger

and i also want the other edge is fixed, it can not be dragged

do you guys have any tips for me?

Hi, I have a question for clearing data series.

Unlike XyDataSeriess object, when I call clear() method on UniformHeatmapDataSeries,

following exception occured.

[error message]
java.lang.UnsupportedOperationException: This operation isn’t supported by this type of data series
at com.scichart.charting.model.dataSeries.UniformHeatmapDataSeries.clear(SourceFile:328)
at com.scichart.charting.model.dataSeries.DataSeriesCore.clear(SourceFile:66)

How to clear UniformHeatmapDataSeries object data?

Thanks a lot.

Here my code, i try to draw a chart with candle stick and horizontal line with real time data update, but HorizontalLineAnnotation never show, here my code:
final CategoryDateAxis xAxis = sciChartBuilder.newCategoryDateAxis()
.withGrowBy(0, 0.01)
.withVisibleRange(80, 102)
.build();
NumericAxis yAxis = sciChartBuilder.newNumericAxis()
.withAxisId(PRICES)
.withTextFormatting(“0.00”)
.withAutoRangeMode(AutoRange.Always)
.build();

    Collections.addAll(surface.getXAxes(), xAxis);
    Collections.addAll(surface.getYAxes(), yAxis);

               FastCandlestickRenderableSeries rSeries =  sciChartBuilder.newCandlestickSeries().withDataSeries(stockPrices).withYAxisId(PRICES)
                       .build();

                HorizontalLineAnnotation horizontalLine = sciChartBuilder.newHorizontalLineAnnotation()
                        .withPosition(5d, 3.2d) // i have try to change this but wont work
                        .withStroke(2, ColorUtil.Orange)
                        .withHorizontalGravity(Gravity.RIGHT)
                        .withIsEditable(true)
                        .build();
    ohlcAxisMarker = sciChartBuilder.newAxisMarkerAnnotation().withY1(1d).withBackgroundColor(0xFF33DD33).withYAxisId(PRICES).build();

                UpdateSuspender.using(surface, new Runnable() {
                    @Override
                    public void run() {
                        Collections.addAll(surface.getAnnotations(), ohlcAxisMarker, horizontalLine);
                        Collections.addAll(surface.getRenderableSeries(), rSeries);
                        Collections.addAll(surface.getChartModifiers(), sciChartBuilder.newModifierGroupWithDefaultModifiers().build());
                    }
                });

Hi, I’m modifying AudioAnalyzer chart example.

1. I want to know that how to display time value on XAxis in this example.

In audio stream chart example, xData value store 0 to 2048 value for each onNext.

like this,

final long[] itemsArray = audioData.xData.getItemsArray();
for (int i = 0; i < minBufferSize; i++) {
itemsArray[i] = time++;
}

I want to display time value like “mm:ss” format on XAxis.

What kinds of data should be stored in itemsArray?

How to setup VisibleRange and labelFormat?

1. In same example. XAxis lable fixed start to 0(does not move to outside of left for each new data)

How to move xAxis label right to left when new data generated?

Thanks for you kindness.

Hello

I have this chart with CategoryXAxis` as X and **NumericAxis as Y. I update its IohlcDataseries with new prices for creating a live chart. I also added a HorizontalLineAnnotation on Y-Axis to point to the current price. The problem is when chart auto-scales on Y-axis it only tries to cover price data and not the Line annotation, and its label is half visible.

Hi,
=>Scenario
i am using one LineSeries, two ScatterSeries and one ErrorBarsSeries in my Graph.

=> ISSUE
I want to disable whole Rollover Modifier or labels of Rollover Modifier for only ErrorBarsSeries , How can I do that?

Hello Everybody,

I have to continue a Xamarin.Forms application that mainly target android devices. The developer before me wrote everything in shared code and the question is:

Is it possible the use SciChart Xamarin chart in shared code in xaml or I have to code it in Xamarin.Android project?

I am new to Xamarin and just learning the things.
Thanks for the answers and any advice.

Bests,
Roland

I am using RenderSurfaceGL in my chart but I am not able to use Transparency.
What should I do to do this?