unit

Enumerations

enum class UnitType : uint32_t

Name	Value	Comments
None	0	This is used when a HID device does not specify units.
Other	1	This is used when a HID device has a set of units not described below.
Distance	2	A measurement of distance in 10^-6 meter units.
Weight	3	A measurement of weight in 10^-3 gram units.
Rotation	4	A measurement of rotation is 10^-3 degree.
AngularVelocity	5	A measurement of angular velocity is 10^-3 deg/s.
LinearVelocity	6	A measurement of linear velocity is 10^-3 m/s
Acceleration	7	A measurement of acceleration is 10^-3 Gs
MagneticFlux	8	A measurement of magnetic_flux is 10^-6 Tesla (kg/(Amp * s^2))
Light	9	A measurement of light is 1 Candela.
Pressure	10	A measurement of pressure is 10^-3 Pascal (kg/(m*s^2))
Lux	11	A measurement of lux is 10^-6 Candela/(m^2)

UnitTypes are the helpful, "default" units in the system.

These should used throughout the system.

Defined at line 16 of file ../../src/ui/input/lib/hid-parser/include/lib/hid-parser/units.h

enum class System : int8_t

Name	Value	Comments
si_linear	0x1	SI Linear has the following units: centimeter, gram, seconds, kelvin, ampere, candela.
si_rotation	0x2	SI Rotation has the following units: radians, gram, seconds, kelvin, ampere, candela.
eng_linear	0x3	English Linear has the following units: inch, slug, seconds, fahrenheit, ampere, candela.
eng_rotation	0x4	English Rotation has the following units: degrees, slug, seconds, fahrenheit, ampere, candela.
reserved	0x5	English Rotation has the following units: degrees, slug, seconds, fahrenheit, ampere, candela.

Each system defines the units for the following measurements:

length, mass, time, temperature, current, luminous intensity.

Defined at line 59 of file ../../src/ui/input/lib/hid-parser/include/lib/hid-parser/units.h

Records

```
class UnitConversion
```

Functions

```
Unit GetUnitFromUnitType (UnitType type)
```
Get the exact unit from the UnitType.

Defined at line 370 of file ../../src/ui/input/lib/hid-parser/units.cc
```
UnitType GetUnitTypeFromUnit (const Unit & unit)
```
Get the closest convertible UnitType from the unit.

If the unit cannot be converted into a UnitType, |Other| will be returned.

If there are no unit's, |None| will be returned.

Defined at line 380 of file ../../src/ui/input/lib/hid-parser/units.cc
```
double ConvertValToUnitType (const Unit & unit_in, double val_in)
```
Defined at line 392 of file ../../src/ui/input/lib/hid-parser/units.cc
```
void SetSystem (Unit & unit, hid::unit::System system)
```
Sets a Unit's system. A unit can only belong to a single system.

Calling SetSystem on a Unit that already has a system defined

will overwrite the current system.

Defined at line 184 of file ../../src/ui/input/lib/hid-parser/units.cc
```
hid::unit::System GetSystem (const Unit & unit)
```
Defined at line 188 of file ../../src/ui/input/lib/hid-parser/units.cc
```
void SetLengthExp (Unit & unit, int8_t exp)
```
The functions below set the exponent for various measurements.

exp must be within [-8, 7].

The measurement's unit is defined by the Unit's system.

Example: Momentum is (mass * distance / time) so it has a mass

exponent of 1, a distance exponent of 1, and a time

exponent of -1. Under the SI Linear system this would

be (gram * centimeter / seconds).

Defined at line 204 of file ../../src/ui/input/lib/hid-parser/units.cc
```
void SetMassExp (Unit & unit, int8_t exp)
```
Defined at line 206 of file ../../src/ui/input/lib/hid-parser/units.cc
```
void SetTimeExp (Unit & unit, int8_t exp)
```
Defined at line 208 of file ../../src/ui/input/lib/hid-parser/units.cc
```
void SetTemperatureExp (Unit & unit, int8_t exp)
```
Defined at line 210 of file ../../src/ui/input/lib/hid-parser/units.cc
```
void SetCurrentExp (Unit & unit, int8_t exp)
```
Defined at line 214 of file ../../src/ui/input/lib/hid-parser/units.cc
```
void SetLuminousExp (Unit & unit, int8_t exp)
```
Defined at line 216 of file ../../src/ui/input/lib/hid-parser/units.cc
```
int GetLengthExp (const Unit & unit)
```
The functions below get the exponent for various measurements.

The return value will be within [-8, 7].

Defined at line 218 of file ../../src/ui/input/lib/hid-parser/units.cc
```
int GetMassExp (const Unit & unit)
```
Defined at line 220 of file ../../src/ui/input/lib/hid-parser/units.cc
```
int GetTimeExp (const Unit & unit)
```
Defined at line 222 of file ../../src/ui/input/lib/hid-parser/units.cc
```
int GetTemperatureExp (const Unit & unit)
```
Defined at line 224 of file ../../src/ui/input/lib/hid-parser/units.cc
```
int GetCurrentExp (const Unit & unit)
```
Defined at line 226 of file ../../src/ui/input/lib/hid-parser/units.cc
```
int GetLuminousExp (const Unit & unit)
```
Defined at line 228 of file ../../src/ui/input/lib/hid-parser/units.cc
```
bool ConvertUnits (const Unit & unit_in, double val_in, const Unit & unit_out, double * val_out)
```
Convert a value from one unit to another.

Returns False if it is impossible to do the conversion.

Defined at line 230 of file ../../src/ui/input/lib/hid-parser/units.cc