Do you mean the first point? Yes, the price can change it, but what is the use of it if it has already been updated (become larger/smaller)?

Then the graph will have many points when moving up and many points when moving down. If I understood you correctly.

And, I have a “Peaks and Troughs” indicator, it was created for drawing graphics on it, it is simpler in terms of functionality, but the mechanism for constructing the first point is different, look at it in the strategy tester, maybe this is what you want or will guide you for some useful thoughts.