Questions

Hello.

I have found out that calling suspendUpdate() and resumeUpdate() on a SciChartSurface object allocates memory that is never released. The allocations get bigger with more data in the chart.

I have created an empty Android project. I have added a SciChartSurface and a Button. Pressing the button suspends and resumes updates. You can then see in the Android Monitor that after each press of the button the memory consumption of the app increases. Since the chart is empty the allocations are very small but still noticeable. I have attached the zip of the example project.

Kotlin code of the Activity in the project:

class MainActivity : AppCompatActivity()
{
    override fun onCreate(savedInstanceState: Bundle?)
    {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val layout = findViewById(R.id.layout) as ConstraintLayout

        val chartSurface = SciChartSurface(this)
        layout.addView(chartSurface)

        val button = findViewById(R.id.button) as Button
        button.setOnClickListener {
            val suspender = chartSurface.suspendUpdates()
            chartSurface.resumeUpdates(suspender)
        }
    }
}

I

P.S.:
I have tried to open a priority ticket, but I got the following error:

We encountered a problem (cross-site request forgery detected); please try again
Sorry, we encountered a problem (invalid department). Please start over.

hi

any plans to support xamarin forms in the future.

Hello!

I want the chart to scroll from right to left and stop at left side. Don’t automatically scale, don’t move right.

I have a modifier:

ZoomPanModifier zoomModifier = new ZoomPanModifier() { ... };
zoomModifier.setReceiveHandledEvents(true);
zoomModifier.setXyDirection(XyDirection.XDirection);
zoomModifier.setClipModeX(ClipMode.ClipAtExtents);
// zoomModifier.setClipModeX(ClipMode.ClipAtMin);

When I scroll a chart left to the beginning, it scales the chart to one screen. So, all points are visible, proportions are broken.
When I replace “ClipMode.ClipAtExtents” to “ClipMode.ClipAtMin”, it sometimes stops at left side (as desired), but if I swipe too fast, it shows a right part of the chart and continues to scroll left.
Currently a first version of the SciChart library is installed.
As written in https://www.scichart.com/documentation/android/v1.x/SciChart.Charting~com.scichart.charting.ClipMode.html both “ClipAtExtents” and “ClipAtMin” have another behaviour.
My question is similar to https://www.scichart.com/questions/question/disable-scaling-on-zoompanmodifier, but for Android.

Answer, please, is it a bug? Has it been already fixed or expected to be fixed?

Hi, I would like to make styling on the candlestick stroke of each tick by different situation, like if open > close show red stroke and on reverse in blue color stoke.

I have extended the PaletteProviderBase and implemented the IStrokePaletteProvider and IFillPaletteProvider interface, it seems that it always render the black stroke, but the filled color was correct as expected. Is there any way to custom the stroke color by case? Thanks!

I use the same approach as this suggested (candlestick-chart-coloring) , it seems in 2.0.0 cannot style the stroke as this way.

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

Hi,

I’m trying to colorize my Column Chart according to my Candle Chart (red / green).
I’ve tried to create a Palette provider, but I don’t know how to get the corresponding item from my Candle Data.

How can I do this?

Hi ,

I am trying to change background color of scichart surface and also need to change color of grid bands and grid lines.

So far I am able change background color of scichart surface using scichartSurface.setBackgroundcolor API

But I am not able to find api can customize/ remove grid bands and grid lines.

Please find images attached for more details.

I see there is a Polar chart type for WPF charts and that one is “coming soon” to Android. Is it known when we can expect it to be available on Android?

Thank you in advance.

Hello, I hope you can help me! please
How could you reach this special design with androidchar.
it’s possible?
Please I need to know if it is feasible, with this I could start to carry out my project.
Thanks in advance.

Hello !

I have a chart displaying very accurate data and I would like the RolloverModifier to adopt the same format as my Y axis.
I want to avoid problems similar to the one on the screenshot attached. The tooltip is indicating -0 and I would like it to display something like -2.5E-6.

Thank you for your help,

Adrien

Is it possible to give an arrow type style to the axes? As seen in the attached image.

It would be perfect!

Otherwise, I would like to know if it is not possible, not to take into account this characteristic in my development.

I hope you can give me a clue please. Thanks in advance.

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…

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.

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 have to implement a zoomable real time chart. I started with CreateRealTimeTickingStockChartFragment as it seems to be the nearest to what I need. I added .withPinchZoomModifier().build() to the chart modifiers, but it doesn’t work very well, there’s lag and jumps…

I’m testing on a Nexus 5.

I also started adapting the example to what I need need which uses a numeric x axis (it measures seconds, which can appear irregularly, so I assume it’s numeric), but noticing the same problems there.

Using SciChart v1.2.1.1540

From this thread, there seems to have been some related problems in an older version, maybe this hasn’t been fully fixed yet? Or maybe I’m configuring something wrong, started using SciChart today and very new to this.

Thanks in advance and amazing work! I’m very excited about this library and hope this works because otherwise it will be probably a deal breaker for the people I’m working for :/

On VS2017, in LineChartFragment.cs, I am trying to use VerticalSliceModifier, but it is not found.

var verticalSliceModifier = new VerticalSliceModifier();

Thank for your help.

in IOS SDK there are SCIAxisRangeSyncronization and SCIAxisAreaSizeSyncronization for dealing with axis sync. I would like to ask are there any similar classes in Android to do this ? Thanks.

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

How to scale axes with different scale factor using pinch zoom?
For example, scale x axis only or scale x axis greater then y axis.

I want to use the SCI Schart view over the smartphone camera surfaceview layout.
When the SCI Chart view is overlapped on the camera surfaceview, only the camera image is visible.
How can the SCI Chart view look normal on the camera surfaceview?

I have DateAxis as X Axis, so I want to trigger a button to zoom In/Out to a specific time at the latest plotted point (Price).
Example: I have zoom button 30 minutes, 15 minutes, 5 minutes and 2 minutes….

do you have offline version of android charts.
my computer is not connected to the internet.
thanks

Hi all, how i can add annotation on the columns of a chart?

Is there an convenient way to convert an existing IXyDataSeries<Date, Double> to IOhlcDataSeries<Date, Double> ?
How do Scichart collapse Candlesticks (and presumably merging with neighbouring candlesticks) when its very zoomed out e.g. 1 year period

How do you place a CustomAnnotation on the axis like an AxisMarkerAnnotation?

Based on the example in https://www.scichart.com/documentation/android/v1.x/webframe.html#Axis%20Types.html

IAxis axis = new CategoryDateAxis(getActivity());
axis.setAxisAlignment(AxisAlignment.Right);
axis.setAutoRange(AutoRange.Once);
axis.setGrowBy(new DoubleRange(0.1d, 0.1d));
axis.setVisibleRange(new DateRange(dateMin, dateMax));

It will crash at setVisibleRange with

java.lang.UnsupportedOperationException: Expected instance of DoubleRange
at com.scichart.core.utility.Guard.instanceOf(SourceFile:45)
at com.scichart.core.utility.Guard.instanceOfAndNotNull(SourceFile:52)
at com.scichart.charting.visuals.axes.AxisCore.setVisibleRange(SourceFile:241)
…

What would be the proper way to set a date range?

I am building a real-time graph with CategoryDate X Axis and Numeric Y Axis. I found it hard to understand the Annotation API’s regarding the X and Y positions.

Q1:
Looking at AnnotationsAreEasyFragment, it draw a Horizontal line of (seemingly) full width. it declares

sciChartBuilder.newHorizontalLineAnnotation()
    .withPosition(7d, 2.8d)
    .withStroke(2, ColorUtil.Orange)
    .build()

i can under Y = 2.8d, but what is the X=7d for? and in the next Horizontal line which is short, it declares .withPosition(5d, 3.2d)?? X=5d and X=7d gives such a big difference.

Q2:
Since i am using CategoryDateAxis, referring to InteractionWithAnnotationsFragment to draw a vertical line at a specific date/time, there is a short line vertical line on 3rd Dec with the code

sciChartBuilder.newVerticalLineAnnotation()
    .withX1(20).withY1(35d).withY2(33d)
    ...

Since its a date axis, i would expect it to accept a Date.class (or long in millis) instead of .withX1(20). It doesnt even make sense! How exactly do i create full height vertical line at a specific date/time?

Hi !

Does the android version of SciChart feature logartihmic axis scaling ?

Hello all,

I’ve a question about the android chart,

I’ve see WPF include fft plotting support, but I didn’t see it in android ?

can you tell me if the android scichart have it ?

thanks