Pre loader

Tag: ChartModifierBase

Welcome to the SciChart Forums!

  • Please read our Question Asking Guidelines for how to format a good question
  • Some reputation is required to post answers. Get up-voted to avoid the spam filter!
  • We welcome community answers and upvotes. Every Q&A improves SciChart for everyone

WPF Forums | JavaScript Forums | Android Forums | iOS Forums

0 votes
0 answers


I created a custom chart modifier that moves a vertical line to the position where the user clicks on the scichart surface (I used OnModifierMouseUp to listen to this event), everything works well except the event fires also when the user scrolls or clicks on the scrollbar i defined for the x Axis (I guess because it is part of the surface anyway).

Is there a way to avoid the scrollbar interaction to fire this event? I’d like for it to be fired only when the user clicks directly on the data/surface rather than the scrollbar itself

Thanks a lot

1 vote


I am evaluating the SciChart control – so far it looks very promising.

I have a FastHeatMapRenderableSeries that is analyzed and a FastLineRenderableSeries line is drawn through the chart.

The user needs to be able to correct the analysis, and this is done by “drawing” in the heatmap.

As far as I could tell, the ChartModifierBase gives med the necessary hooks to track the user’s mouse movements – but I would like to give some visual feedback by changing the cursor, for instance to Cursors.Pen (Cursors from the Microsoft namespace)

Is this possible? I would want to enable drawing when user presses Ctrl, the disable it when user releases Ctrl…

0 votes

I want to implement a PopUpWindowAction and InteractionRequestTrigger via the Micrsoft PRISM Libray:
But it starts with basic problems:
I’m not able to create a correct invokeCommandAction, the RaisItemSelection method gets never executed?


                <i:EventTrigger EventName="MouseDoubleClick">
                    <i:InvokeCommandAction Command="{Binding MouseDoubleClickCommand}" CommandParameter="{}" />


MouseDoubleClickCommand = new DelegateCommand<object>(RaiseItemSelection);
 private void RaiseItemSelection(object obj)
0 votes

We were recently asked on priority support tickets ‘How do I ZoomExtents a SciChartSurface to a specific range, e.g. VisibleRangeLimit, when double clicking on the chart’.

For the benefit of our user-base our solution is below.

1 vote

Hi there,

I am currently evaluating SciChart for use within a new piece of software we are developing. One important feature that we need to provide is to be able to draw a polygon and determine which points are contained within it. Then the colour, visibility, etc of these points can be changed. I can see from your documentation that this could be achieved by creating a custom chart modifier to draw lines that make up the shape and then implement my own algorithm to determine which points are contained within it. Before I embark on this route, could you tell me if I have missed any implementation that already exists? Will the drawn polygon zoom and pan with the graph, therefore enclosing the same points?

Kind Regards,


4 votes

Hi guys,

After adding a YAxis to the left of my SciChart I’ve noticed that this code no longer functions as I expect:

        public override void OnModifierMouseDown(ModifierMouseArgs e)

            if (ParentSurface.RenderableSeries.First().XAxis == null)

            if (!_mouseDragged && IsFunctional)
                _mouseDragged = true;
                _selectionStart = (DateTime) ParentSurface.RenderableSeries.First().HitTest(e.MousePoint).XValue;

_selectionStart should be a Date under the cursor where the user has just clicked. Instead it’s a Date approx. 40pixels to the right of where the user has just clicked because the Left YAxis is approx. 40 pixels, and the ModifierMouseArgs.MousePoint is considering the YAxis space into it’s X coordinate value.

So when I take that point and perform a HitTest, I am not getting the expected result here.

I will write a fix for this to take into account a Left Y Axis if one exists and modify the point’s X coordinate value, but I thought to give you a heads-up in case this is outside of expected functionality and is indeed a bug.


  • bstapylton asked 12 years ago
  • last active 2 years ago
4 votes

I am trying to add Zoom capability to application that is based on ECG Monitor sample. As ECG Monitor manages VisibleRange, I need to stop setting VisibleRange when zoom is started. I am setting flag in RubberBandXyZoomModifier.OnModifierMouseDown.

Is there any way to create a custom ChartModifier to be notified when the user clicks mouse down on the chart, or axis?

Showing 7 results