First failed step.

.gitignore

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+/target
+**/*.rs.bk

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "linearscale"
+version = "0.1.0"
+

Cargo.toml

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+[package]
+name = "linearscale"
+version = "0.1.0"
+authors = ["Bill Thiede <git@xinu.tv>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/main.rs

@@ -1,4 +1,41 @@
-pub struct LinearScale {}
+/// You configure it with an input range and an output range
+/// then you pass it values within the input range and it returns where that value falls in the
+/// output range
+/// The trick is that input and output can be either integers or floats
+/// and if it's all integers no floating point math is used. If either is a float then floating
+/// point math is used
+use std::ops::Add;
+use std::ops::Div;
+use std::ops::Mul;
+use std::ops::RangeInclusive;
+use std::ops::Sub;
+
+pub struct LinearScale<InT, OutT>
+where
+    InT: Sub<Output = InT> + Add + Mul + Div + From<OutT>,
+    OutT: Sub<Output = OutT> + Add + Mul + Div + From<InT>,
+{
+    input: RangeInclusive<InT>,
+    output: RangeInclusive<OutT>,
+}
+
+impl<InT, OutT> LinearScale<InT, OutT>
+where
+    InT: Sub<Output = InT> + Add + Mul + Div + From<OutT>,
+    OutT: Sub<Output = OutT> + Add + Mul + Div + From<InT>,
+{
+    fn new(input: RangeInclusive<InT>, output: RangeInclusive<OutT>) -> LinearScale<InT, OutT> {
+        LinearScale { input, output }
+    }
+
+    fn output_for(&self, v: InT) -> OutT {
+        OutT::from(v)
+        //let in_alpha = (v - *self.input.start()) / (*self.input.end() - *self.input.start());
+        // (*self.output.start() + (in_alpha * (*self.output.end() - *self.output.start()))) / (*self.output.end() - *self.output.start())
+    }
+}
+
+fn main() {}
 
 #[cfg(test)]
 mod tests {