SciChart® the market leader in Fast WPF Charts, WPF 3D Charts, and iOS Chart & Android Chart Components

1 vote
132 views

Regarding Andrews comment on my question in this thread: https://www.scichart.com/questions/wpf/hittest-with-mvvm#sabai-entity-content-13177.

Thanks Andrew,
actually I need to know which nearest Y-value my XY line series has at the given VerticalLineAnnotationViewModel position. I need this value only for some calculation no need to show this on screen.

I found this post:
https://www.scichart.com/questions/wpf/current-y-value-of-annotation

But neither your answer Andrew nor the suggested solution of Alitec Developer works for me. The VerticalSliceHitTest() returns always a HitTestInfo with default values and the FindIndex() approach is not suitable for me because I have unsorted data.

  • Roland D asked 1 month ago
  • last active 1 month ago
0 votes
288 views

Hello,

I am creating a LineAnnotation using Annotation Modifier.

In AnnotationCreated event, I need the Hit Test Info of the start and end Points of annotation i.e. annotation.X1,Y1,X2,Y2 points in order to find out the series name and other information(similar to HitTestAPI example in examples suit).

I also need to verify if they are lying on a series or not.

The problem here is series.HitTest() accepts a raw point which I am unable to get from annotation.

Is there any way to do this.

0 votes
308 views

I am creating point data series using SCIXyScatterRenderableSeries.
I need to tap on specific data points and display pop over or some view on top of it. Pop over provides information regarding that point.

How can I implement that in iOS.

0 votes
343 views

We have a graph surface with some point markers on it and we want to show a custom tooltip every time the user taps on a point marker. So far I’ve used a UITapGestureRecognizer, convert the touchpoint in the chart frame and for each of the renderable series perform a HitTestAtX with a radius (I’ve tried 1, 5 and 30) but it always returns true, even if I tap on an area where there’s a gap in the chart. Here’s some sample code:

SCIHitTestInfo hitTestInfo = renderableSeries.HitTestProvider.HitTestInterpolateModeAtX(touchPoint.X, touchPoint.Y, 30, renderableSeries.CurrentRenderPassData);

if (hitTestInfo.match)
{
       Console.WriteLine($"Tapped {hitTestInfo.xValue} {hitTestInfo.yValue} with index {hitTestInfo.index} of the series {renderableSeries.DataSeries.SeriesName}");

       var elementSeries = Model.BottomRightLegendList.FirstOrDefault(tup => tup.DataSeries.SeriesName == renderableSeries.DataSeries.SeriesName);

       var element = elementSeries.GraphElement;

       if (element != null)
       {
            matchedElements.Add(element);
       }
}

Why is the “match” property always true, even if there are no Point Markers in the radius?

0 votes
2k views

Hi All,

I’ve got a class that derives from the DataPointSelectionModifier in order to access the OnValueChanged() functionality and everything is fine (Thank you Andrew).

However – When I have 2 series on the chart (scatter series) and 2 points are quite close together, a single selection of a point can result in the selection of two points. On playing around with it a bit I notice that a point can be selected when the mouse pointer is slightly outside the limits of the pointmarker (in this case a 10×10 EllipsePointMarker) so if you get 2 points only a few pixels apart it is possible to place the mouse between the two and get both points selected. You can also see the behaviour in the SciChart examples 2DCharts|Toltips and Hit Test| Pointmarkers Selection example if you play with the points in the top left corner.

The Question: Is there a way to reduce the area around the mouse pointer that a hit test is detected in? (e.g. 20 pixel radius down to say 5 pixel radius)

I’ve had a look at overriding GeometryHitTestResult HitTestCore but I don’t really know if this is even the right way to go. If somebody can confirm this is where I should be looking then I’ll find some time to persevere with it.

Thanks in advance
/Stuart

1 vote
2k views

I have multiple series on a chart surface, each with their own y-axis. I do not want to display all y-axes as this would take up half the chart surface.

Is there a way to make the matching y-axis only visible when the mouse cursor hovers over a series (hit-test)? How would I go about that?

Thanks
Matt

  • bbmat asked 2 years ago
  • last active 2 years ago
2 votes
3k views

Hi,
I am currently trying the iOS Charting Library and want to implement a Column series with the drill-down functionality (when touching one of column points by end user). Does the charting component supports the hit-testing or selection feature to determine which point has been clicked at runtime?
Thanks!
Liza

  • liza yudup asked 3 years ago
  • last active 3 years ago
0 votes
2k views

I have multliple renderable series on one scichartsurface and each series has its own y-axis, when CursorModifier-cross moves over line/scatter point/ohlc/candle series how can I ONLY show the y-Value on the with the rendered series matching y-Axis?

With multiple rendered series its virtually impossible to determine which y-Axis value pertains to the specific point of the CursorModifier which “hit-tests” a rendered series.

Is there a simple way to only highlight the y-Value on the matching yAxis as soon as the CursorModifier hit-tests a rendered series? I do not mind to show all yValues on all yAxes when the CursorModifier does not hit-test any rendered series.

Thanks

  • bbmat asked 4 years ago
  • last active 4 years ago
0 votes
6k views

We are using SciChart 2.2.3441
And i need to detect hit only at DataPoint,
RenderableSeries.HitTest(hitTestPoint, true) – works fine!
But RenderableSeries.HitTest(hitTestPoint, 10, false) – always returns IsHit = false. No matter what is hitTestRadius.
See attached project for example

Showing 9 results
This template supports the sidebar's widgets. Add one or use Full Width layout.
SciChart WPF v6 BETA released! Note pricing/licensing changes are coming. Contact us to beat the rise!Read more
+