3. Basics of PhotoLine / 3.3 User Interface Elements
3.3.7 Unit Text Fields
Unit text fields are used in PhotoLine, if you have to enter values, which
allow different units. If there is an abbreviation behind a value, the text field
is a unit text field: 
Unit
text field have some advantages:
- They show the current value in the desired unit.
- You are able to change the unit by right clicking with the mouse (or
Ctrl+mouse click on macOS). After that, a menu appears with the
available units:

- The
current unit is checked. Each unit shows its name and - in brackets -
its abbreviation.
- You can always enter a value in one of the available units by appending
the corresponding abbreviation. After finishing the input, PhotoLine
converts the value into the current unit.
- Unit text fields can be used to calculate simple terms like "(3 + 4) * 5".
You can use several units in one term, like "12 in + 7 pt", too.
- Some functions even allow calculations using variables. "Scale Layer"
(see chapter 7.5.3) is using "w" as a substitution for the layer width and
"h" for the layer height. In these cases, one of the predefined functions
may be useful:
- - sin(radiant)
- - cos(radiant)
- - tan(radiant)
- - sqrt(value)
- - min(value1; value2[;...])
- - max(value1; value2 [;...])
- - if(condition;value1;value2)
- - floor(value): round down the value
- - ceil(value): round up the value
- - round(value): round the value
- - abs(value): returns the absolute value of a number
- Aside from that, the comparison operators "<", "<=", "=",
">" and ">="
are supported.
- You can modify the value by using the mouse wheel. Holding Shift
reduces the step size, holding Ctrl (Windows) or Command (macOS)
enlarges it.
- If you hold the Ctrl key or press the middle mouse key (Windows) or the
Command key (macOS), you can change the value of a unit text field by
dragging.