The input of numerical data such as the length of a line, is made in special input boxes.

# Using units of measurement

The numeric values entered in the input boxes are considered expressed in the current unit of measure. For example, if the current unit of measurement is the millimeter, the number 100 entered in an input box is interpreted as 100mm. To specify a numerical value with a different unit of measurement, simply add a suffix to the number indicating the unit of measurement. For example, if the current unit of measurement is the millimeter, typing 100 or 10cm will always result in the same value of 100mm.

# Using the expressions

The boxes for entering numerical data accept, in addition to simple numbers, also complex expressions that may include: operators, functions and constants.

In addition to the constants defined for numeric expressions, the constants listed in the following table can also be used in the input boxes:

Constant name | Description |
---|---|

sa | Value of the angle snap. |

sx | Value of the distance between the vertical lines of the snap grid. |

sy | Value of the distance between the horizontal lines of the snap grid. |

For example, for a value that is 3 times the horizontal snap, specify: 3*sx.