Plot Panel: Add possibility to display static polygon on top of plot

[tonynajjar]

As the title says this is a feature request for the Plot panel to enable displaying a static definable polygon overlayed on the plot. Ideally, we would input the message path to that polygon (e.g. geometry_msgs/msg/Polygon).

My specific use case: using the Plot panel, I plot speed vs steering angle of my robot. The combination of these two values should not go outside of a certain "envelope" (represented by a polygon). I'd like to visualize this envelope/polygon on the plot to catch when the combination of speed and steering angle goes outside of it.

[tonynajjar]

I guess this is similar to https://github.com/orgs/foxglove/discussions/176 and https://github.com/orgs/foxglove/discussions/471

[defunctzombie]

While we don't have the ability to specify this value via a message - you can enter a fixed value in the "message path" for a plot series and that will display a dashed line:

Here's an example with some sample IMU data where I set 0.8 as the "Max" series and it shows a line.

[tonynajjar]

Thanks for the tip but I don't think that would do it for me, I need something like this:

I edited in the red square, in reality the polygon is more complex than that. I think your issue would be the best way to achieve this