Make dragged point leave trace

Hi everyone,

I have been interested in getting a dragged point to leave a trace of where it has been on the graph, but I haven’t figured out how to code it. In other words, as you drag a point around the graph, it leaves a continuous trace, or discrete points if there are step values associated with the coordinates.

Below is a workaround I came up with for investigating a linear inequality. I capture each sketch point, color it in white, then add that point to a set of plotted values.

I’d rather just let a graph point itself add to a set of plotted values.

Is there a straightforward tool I’m missing?