Replace numbers and invert time normalizations

Good morning everyone,
I am using LabVIEW for CAD/CAM purposes, and the aim of my program is to control a trajectory along several consecutive straight lines defined by its corner points (x and y coordinates).
My program uses only mathematical equations (parametric equations) and I am using a simulate signal (time normalization) between 0 and 1. To perform the straight lines my idea is to replace the position of the points and, at the same time, invert the time (from 0 to 1 to 1 to 0) - please see the attached image - and so on.
Because I am a new Labview user, I would like to know it this point replacement is in fact possible, and also how to invert the time normalization.
Hope to have been the clearest as possible.
Thanks you very much in advance.
Attachments:
2015-04-27 11.09.37.jpg ‏1832 KB

Cheers,
The inversion of the variable t (time) is made with the purpose of having a continuous time signal and also to allow us to replace only one of the two points when a segment is finished.
Thus, I need to know how to invert these variable, and also how to replace the points, "automatically", in the block diagram window. I suppose that some loops will have to be used.
Although this is a mathematical problem, my inexperience using Labview makes me wonder how to perform such an apprach.
Perhaps, the attached note can help you understand to understand what I exactly would like to do in Labview.
Thank you very much,
Francisco
Attachments:
Note.pdf ‏234 KB

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