# Is it possible to create an overlay on top of the vtkChart?

**URL:** <https://discourse.vtk.org/t/is-it-possible-to-create-an-overlay-on-top-of-the-vtkchart/15214>\
**Category:** Development\
**Created:** [January 27, 2025, 7:16pm UTC](https://discourse.vtk.org/t/is-it-possible-to-create-an-overlay-on-top-of-the-vtkchart/15214 "2025-01-27T19:16:18Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Michael\_Jackson](https://discourse.vtk.org/user_avatar/discourse.vtk.org/michael_jackson/32/61_2.png) [@Michael\_Jackson](https://discourse.vtk.org/u/Michael_Jackson)\
**Post date:** [January 27, 2025, 7:16pm UTC](https://discourse.vtk.org/t/is-it-possible-to-create-an-overlay-on-top-of-the-vtkchart/15214/1 "2025-01-27T19:16:18Z")

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Does anyone know if it is possible to create an overlay where we render something arbitrarily on top of a vtkChart? We essentially would like to do a hover effect when some other action in our UI signals we create an overlay on top of the vtkChart to display something like a “Click Here” thing.

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**Author:** ![Paulo\_Carvalho](https://discourse.vtk.org/user_avatar/discourse.vtk.org/paulo_carvalho/32/370_2.png) [@Paulo\_Carvalho](https://discourse.vtk.org/u/Paulo_Carvalho)\
**Post date:** [January 28, 2025, 7:19pm UTC](https://discourse.vtk.org/t/is-it-possible-to-create-an-overlay-on-top-of-the-vtkchart/15214/2 "2025-01-28T19:19:50Z")

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Hello,

Based on my own exprience, VTK charts are not renown for built-in high interactivity. Here’s something that may help you to get started: [Interactive 2D plots with VTK (The Visualization Toolkit) | echnoT's Techno](https://echnotstechno.wordpress.com/2014/08/13/interactive-2d-plots-with-vtk-the-visualization-toolkit/) . It’s from 2014, but it may cast a light on how to implement interactive VTK charts.

best,

PC