slider with numbers

[GeekTweak.0]

So i got the slider itself working, but how would I, for example with a slider length of 1 to 100 pixels create an array of numbers between 20 and 200? (or simply between numbers x and y)?

I figure theres tutorials all over the web for a formula, and that theres even a simple 9th grade math equation for it, but im simply too lazy.

Thanks in advance for any help..

[TheCanadian]

I figure theres tutorials all over the web for a formula, and that theres even a simple 9th grade math equation for it, but im simply too lazy.

Well I was going to just give you the equation until I read that It is a very simple problem: you want a linear function that maps 1->20 and 100->200. That's enough data to solve the equation y=mx+b.

[GeekTweak.0]

alright, so maybe im just a moron, but i am having trouble and learn much better through visual example. from x values of the slider being between 10 to 100, and desired output being between 20 to 200, and variable:value is the output depending on slider.x(that x value being between 10 and 100).... what equation do i plug in to get value?? Maybe just cuz i aint been in school for a while, maybe cuz im tired, maybe both, idk. please just give me the answer XP

[TheCanadian]

Oh the input value is from 10 to 200? That makes it even easier. You really can't figure out how to scale the interval 10-100 to 20-200?

Here's a visual example: Tommy has 10 apples. Sally has 20 apples. How many times more apples does Sally have than Tommy?

[Thovas]

Usually i make the sliders to return Number from 0 to 1 and then transform it to any value needed. Simple percentage usage. I that case the transformation will look something like this:

value = minValue + (Math.abs(maxValue - minValue)*sliderPercent);

in your 20 to 200 case:
value = 20 + (Math.abs(200-20)*sliderPercent);

Props to The Canadian for the visual aids

[TheCanadian]

I knew someone was just going to give it to him eventually. Although, if your input is 10-100, there is a much simpler equation to use. Perhaps there's some constant you can multiply it by…

[Thovas]

Although, if your input is 10-100, there is a much simpler equation to use. Perhaps there's some constant you can multiply it by…

I wonder what that constant might be ...

[TheCanadian]

I'm sure there's enough leading questions in this thread to figure it out

[GeekTweak.0]

yes thank you everyone. the answer was very simple. I needed the formula because the min-max values and variables would be different for each slider i make. thanks.

[TheCanadian]

I gave you the formula in the second post