General Use of Transformations


General Use of Transformations

We will demonstrate the use of transformations by a simple translation. The generation of a transformation consists of two steps:

  • First, a transformation has to be defined by a suitable transformation mode.
  • Second, once a transformation has been defined, it can be applied to arbitrary geometric objects.

During a move in move mode, the parameters of a transformation become updated automatically such that the images of the transformed objects move accordingly.

Defining a Transformation

As with the usual geometry modes, how to define a transformation depends on the exact type of transformation you want to define. A translation is defined by clicking two points A and B. This translation corresponds to the geometric shift that moves A to the position of B.

Consider the following example: Assume that points A and B are already present in the drawing. To define a translation you have to choose the mode Translation from the Mode -> Transformation menu. After point A is clicked, an arrow appears as an optical hint for the construction of the translation. Then you click point B. After this, a little rectangle, a so View Button, appears that serves as a link to the translation further on.

First selection:
The first point of the
translation is selected.
Moving the mouse:
An arrow hint
is shown.
Move to second point:
The arrow helps you.
Second selection:
The translation
is created.

The view button serves a kind of representative for the transformation and acts almost like an ordinary geometric mode. By pressing it you apply the transformation to the currently selected elements.

Applying a Transformation

After you have defined the transformation, you can use it. For this you have to go to Move Mode, which at the same time serves as the selection mode. Now you select one or several elements by clicking them. If you want to have a multiple selection, you must hold down the shift key. After you have selected the elements you want to map via your translation, you simply press the view button of your transformation. In this way the mapped elements are created. They will automatically have the same appearance settings as their preimages. Furthermore, they will automatically become the active selection, so that you can easily apply a transformation to them again.

Select the preimage:
You must do this in
move mode.
Move the mouse:
If you move over
a transformation,
it is highlighted.
Click the transformation:
This maps the element.
Another click
maps the mapped
elements again.

Changing the Parameters of a Transformation

A transformation is a dynamic object. If the position of the preimages changes, then the mapped elements become updated accordingly. If in our example A or B is moved, then the mapped circles will move as well.

Changing the translation

Selecting a Transformation

Sometimes, it may be necessary to select a transformation. This can also be done in Move Mode. However, for selecting the transformation you have to press the shift key while you click it. Selected transformations may be used as input parameters for transformation groups or iterated function systems.

Contributors to this page: Richter , Kohler , Kortenkamp and Kramer .
Page last modified on Saturday 30 of July, 2011 [08:52:20 UTC] by Richter.

The content on this page is licensed under the terms of the License.

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