Class Group

As said all units of one group are convertible into each other. This works through the concept of "base units":

Every group has one single base unit. All other units of the group are defined in relation to this special unit. In this way, the library can figure out any conversion between any units of one group.

Example:

You create the group "length".

const length = new Group("length");

You want to implement the units "meter", "inch" and "yard". Now you have to decide on a unit that you want to be the base. You take "meter".

After that you have to define the other units in relation to your base unit. You know: 1 inch = 0.0254 meter. So you set the ratio to 0.0254 and the shift to 0.

const inch = new Unit({...}, 0.0254, 0, ...);

You know aswell: 1 yard = 0.9144 meter. So you set the ratio to 0.9144 and the shift to 0.

const yard = new Unit({...}, 0.9144, 0, ...);

The base unit's ratio is always 1, its shift is always 0 (because 1 meter = 1 meter).

const meter = new Unit({...}, 1, 0, ...);

Now you finally have to add the units to your group. You can do that using the Group.Editor.

length.add(inch, yard, meter);

And you're done.