Info about the changes in morph::range and morph::Scale plus an extra…

… Scale test

docs/ref/coremaths/range.md

@@ -36,10 +36,13 @@ morph::range<float> r(0.0f, 10.0f); // Construct with a defined range
 **Update** the range to include a value
 ```c++
 morph::range<int> r; // range initially 0 to 0
-r.update (100);      // range now 0 to 100
-r.update (-100);     // range now -100 to 100
+bool changed1 = r.update (100);      // range now 0 to 100
+bool changed2 = r.update (-100);     // range now -100 to 100
+bool changed3 = r.update (50);       // range unchanged; still -100 to 100
 ```
 
+`update` returns a `bool` which will be true if the range was changed and false if the range is not changed. In the example above, `changed1` and changed2` will both be `true`, but `changed3` will contain `false`.
+
 **Set** the range manually in a single function call
 ```c++
 morph::range<int> r; // range initially 0 to 0

docs/ref/coremaths/scale.md

@@ -150,7 +150,15 @@ s.output_range.max = 5;
 s.compute_scaling (-10, 10);
 ```
 
-You can also trigger the computation of the scaling function if you have a container of data by using `compute_scaling_from_data`, which is the function that is automatically called by `transform` when `do_autoscale` is `true`.
+You can also pass the input range to `Scale<>::compute_scaling` and set the `output_range` using `morph::range<>` objects:
+
+```c++
+morph::Scale<int, float> s;
+s.output_range = morph::range<float>{0, 5};
+s.compute_scaling (morph::range<int>{-10, 10});
+```
+
+You can trigger the computation of the scaling function if you have a container of data by using `compute_scaling_from_data`, which is the function that is automatically called by `transform` when `do_autoscale` is `true`.
 
 ```c++
 morph::Scale<int, float> s;

tests/testScale.cpp

@@ -252,5 +252,12 @@ int main () {
     // Fifth element should be NaN still:
     if (!std::isnan(resultnan[5])) { --rtn; }
 
+    morph::Scale<int, float> sif;
+    sif.output_range = morph::range<float>{0, 5};
+    sif.compute_scaling (morph::range<int>{-10, 10});
+    std::cout << "input 8(int) transforms to float: " << sif.transform_one (8) << std::endl;
+    if (sif.transform_one (8) != 4.5f) { --rtn; }
+
+    std::cout << "testScale " << (rtn == 0 ? "Passed" : "Failed") << std::endl;
     return rtn;
 }