- Ruler

Define here the maximum and step parameters
controlling the ruler (in the tools menu).
### Rotate

**Max** sets the range of angle values accepted by the ruler,
to rotate objects. Clicking on the ruler extreme left, the
object is rotated by **-Max**. Clicking on the ruler
extreme right, the object is rotated by **Max**.
**Max** must be positive.
### Move

**Max** sets the range of length values accepted by the ruler,
to move objects. Clicking on the ruler extreme left, the
object is moved by **-Max**. Clicking on the ruler
extreme right, the object is moved by **Max**.
**Max** must be positive.
### Scale

**Max** sets the range of factor values accepted by the ruler,
to scale objects. Clicking on the ruler extreme left, the object
is scaled by **1 / Max**. Clicking on the ruler extreme right,
the object is scaled by **Max**. **Max** must be larger than 1.

The rotation angle applied to the object, when clicking on the
ruler, increases from the extreme left to the extreme right
(from **-Max** to **+Max**), in a step by step way.
The width of each step, starting from the center to the extremes,
is defined by **Step**.

For example, when **Step** is set to **Max**,
only two angles are recognized: **-Max** on the left
(negative) side and **+Max** on the right (positive)
side of the ruler. When **Step** is 0, the angle
changes continuously from one extreme to the other.

**Step** cannot exceed **Max**, otherwise the extreme
values would never be reached (the central value is always 0).

The translation length applied to the object, when clicking on
the ruler, increases from the extreme left to the extreme right
(from **-Max** to **+Max**), in a step by step way.
The width of each step, starting from the center to the extremes,
is defined by **Step**.

For example, when **Step** is set to **Max**,
only two lengths are recognized: **-Max** on the left
(negative) side and **+Max** on the right (positive)
side of the ruler. When **Step** is 0, the length
changes continuously from one extreme to the other.

**Step** cannot exceed **Max**, otherwise the extreme
values would never be reached (the central value is always 0).

For example, when **Step** is set to **Max - 1**,
only two factors are recognized: **1 / Max** on the left
side and **Max** on the right side of the ruler. When
**Step** is 0, the factor changes continuously
from one extreme to the other.

**Step** cannot exceed **Max - 1**, otherwise the extreme
values would never be reached (the central value is always 1).