values in a desired interval

Hi everybody, I'm working on a definition that scales curves, based on how close a point is, so I used a typical distance and minimum components, then i used a cosine component with an expression multiplying it by pi/2, so it reverses the values so when the value is cero i get the maximum size, and with 1 I get zero scale.

the problem is that now I want the same thing but I want to scale the curves from 0 to .5, so in a cosine definition the values would have to go from pi/3 to pi/2

So my problem basically is how do I imput my distance values to a component and i make it range between those values. it seems a bit confusing but i don't know what other function to use or multiply it by something else

thanks in advance for your help
cheers
Diego

Replies to This Discussion

Permalink Reply by Andrew Heumann on August 13, 2009 at 3:04pm

This is a frequent task within Grasshopper — I hope at some point a component will be introduced to take care of it in one go. I have seen people create them with scripting, but I always do it the manual way. I usually use a custom expression to take care of it, as seen in the attached ghx, but I have decomposed the expression into its respective components in the image, to show what's going on. The expression I use is this:
((values-currentMin)/(currentMax-currentMin))*(desiredMax-desiredMin)+desiredMin
As far as I know the max and min of a set of values cannot be calculated inside an expression component, so you have to use "Bounds" and "interval components" to get those values.

Hope this helps!

Attachments:

Picture 38.png, 59 KB
ScaleValues.ghx, 51 KB

Permalink Reply by diego on August 13, 2009 at 5:49pm

This is great helps a lot, I had settle down for a linear equation giving me similar results, but this actually gives me better results, thanks a lot I really like the expression, i knew it was a kind of equation in which i had to divide and multiply but my math is kind of rusted these days.I agrre with the component idea, it would have a great idea to tell david about two weeks ago....

thanks a lot again, this has been very helpful, especially now that the next part of my definition is to scale from 0 to .25 so i'll use this solution a lot from now on, I agrre with the component idea, it would have a great idea to tell david about two weeks ago....

Diego

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