Redefine Dialog
Redefining objects is a very versatile way to change a construction. Please note that this may also change the order of
the construction steps in the 
Construction Protocol.
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The redefined element can only depend on elements defined earlier in the construction order, so you may need to change
order of the elements in |
In GeoGebra, an object may be redefined in different ways:
-
Select
Move Tool and double click
on any object in the 
Algebra View.-
For free objects an editing field is opened allowing you to directly change the algebraic representation of the object. Hit the Enter key in order to apply these changes.
-
For dependent objects the Redefine dialog is opened allowing you to redefine the object.
-
-
Select
Move Tool and double click
on any object in the 
Graphics View. This opens the Redefine dialog and allows you to redefine the object. -
Change any object by entering its name and the new definition into the Input Bar.
-
Open the
Properties
Dialog and change the definition of an object on tab Basic.
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Fixed objects cannot be redefined. In order to redefine a fixed object, you need to free it first using tab Basic of
the |
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You can also redefine existing objects in the Input Bar. For example type |
Examples
In order to place an existing free point A onto an existing line h, you first need to double click on the point A to
open the Redefine dialog window. Then change the definition to Point[h] in the appearing text field and press
Enter. To remove point A from this line and make it free again, you need to redefine it to some free
coordinates, e.g. (1, 2).
Another example is the conversion of a line h through two points A and B into a segment. Open the Redefine dialog for
line h and change Line[A, B] into Segment[A, B]