how to rescalling a point to another scale

maybe you ask why i write this?
I was trying write a generator number with cpp and i wanted send it to client and create a sine wave use with the points you can see it one my github Server TCP Use API Kernel

ok now let's go

how to change scalling :

it’s very easy really😃 you just need to know these

And Formullar is

Imagine Number is number 30 ok let's go:












for more information read wikipedia
have a good time