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Comments on How to proportionally convert a number in the range of -1 and 1 to a number in the range of 0 and 319

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How to proportionally convert a number in the range of -1 and 1 to a number in the range of 0 and 319

+3
−2

I have float noise values, between -1 and 1, for every x,y coordinate in a 2D area and I am trying to convert that to a whole number between 0 and 319 which represents a vertical z coordinate to render.

For example,

-1 = 0 and   
1 = 319 but    
0.12345 = ???

How would I go about implementing this efficiently?

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2 comment threads

How many such conversions are required (3 comments)
Not sure if I understood entirely your question, but it seems to boil down to a simple set of equatio... (1 comment)
Not sure if I understood entirely your question, but it seems to boil down to a simple set of equatio...
Alexei‭ wrote over 1 year ago

Not sure if I understood entirely your question, but it seems to boil down to a simple set of equations with two variables:

The function is f(x) = a*x + b f(-1) = 0 => -a + b = 0 f(1) = 319 => a + b = 319

=> b = 319 / 2, a = 319 / 2

Of course, this can be generalized to solve the equations for any two points.