# Cartesian References# Cartesian References
 Command SOF_CM_PUNKTKOPPLNUG Tooltip A Cartesian reference can be used to determine a horizontal distance and vertical distance of a point relative to one or more existing cross section points. Sidebar Cross Section Editor
A Cartesian reference can be used to determine a horizontal distance and vertical distance of a point relative to one or more existing cross section points.

Horizontal distance and vertical distance values can be specified parametrically with a variable or formula. The parametric input can be assigned only when editing the points of an existing cross section.

## Input#

At first a point (dependent point), whose coordinates are parametrically / dependent, has to be defined.

Then a cross section point (reference point) can be input in order to define a horizontal distance from the original point for the horizontal distance value.

Finally, a second cross section point (reference point) is necessary to define the vertical distance from the original point.

If a point which was not yet created as a “cross section point” is to be used for a reference point, then a geometry point can be generated at this position.

## Symbolism#

The defined references are displayed now symbolically. The double-ended arrows symbolise the defined horizontal distances or vertical distances. The labelling of the arrows displays either a numerical value (fixed distance; numerical value is the distance currently shown in the cross section), or a variable name or formula (variable distance).

Reference points are represented by a blue triangle and dependent points by a yellow circle.

## Editing#

Dependent points are marked by a circle with a diagonal cross within. By left clicking on this symbol, the entire reference object is shown. Then it can be edited according to the following procedure:

The reference points and the dependent point can be moved by left-clicking on the object and by pulling of the point to another (permissible) cross section point position.

Beside the double arrows there is a lock symbol. Due to left-clicking on the lock symbol in this display the field is unlocked for editing. It is possible to switch to the variable reference point mode.

Left-clicking on the lock symbol in this display unlocks the field for editing and switches into the mode for a variable reference point mode.

A further left-click on the lock symbol closes the lock and switches back to the fixed input mode, i.e. the distance is fixed and corresponds again to the actual distance in the master cross section, and the parametric input for the distance is quasi-deactivated.

The green tick confirms the input.

The red cross cancels the dialog.

Note

If only the horizontal or the vertical value should be variable, only the corresponding reference should get a variable or formula.

## Delete#

A reference can be selected by left-clicking on the reference symbol and then it can be deleted by using the delete key or with the AutoCAD delete command.