How can I restrict DragPoint to only allow dragging in the Y direction?

[RallyTronics]

I don't want the user to be able to drag in the X direction.

[brenocq]

I don't think there is a built-in way of constraining DragPoint so that X coordinate is fixed. I can think of two approaches to implement this.

Constrain after call

You could always return the X value to the previous value after DragPoint is called. This would probably lead to some visual artifacts if the point is being dragged too fast

float backup_x = x;
DragPoint(x, y, ...);
x = backup_x;

Constrain in-call

I think this is the solution that would lead to the best user experience (there would be no jitter when the user is dragging the point fast), but for that, you would need to implement your own DragPoint method (ask an LLM for help!). The x argument would probably be const double x instead of double* x, and you would need to remove the lines that are modifying the x.

You can find the DragPoint implementation here:
https://github.com/epezent/implot/blob/master/implot.cpp#L3905-L3952

It would be nice also to give the LLM the DragLineY code, since it is a bit similar to what you want (but dragging a point instead of a line)

[RallyTronics]

Thanks for the response I have already implemented the constrain after call method and it seems adequate for my proof of concept. I will look into the in-call option if I move forward with my project.