Lines moving?

[ghappy21]

I will draw a line that touches (passes through) the tops of 3 candles. After some time, the line is no longer touching those candles at the same spot. My charts are not auto-scaling. Auto-snap is disabled. I am confusd as to what is happening?

 

[nooris]

Use auto snap and anchor the ends of the lines to the candles, then choose the option to extend the line. I had this same problem with every platform I used (Sierra, Trading View, Tradovate). It's actually a math problem because of how Cartesian graphs work for Euclidean geometry. When the value of the x axis changes then the mathematical relationships of diagonal lines can also change.