ITT Rule IDL Version 7.0 Manual do Utilizador descarregar pdf (Página 195)

Chapter 8: Creating a Manipulator 195

iTool Developer’s Guide Overview of iTool Manipulators

Note

A manipulator need not always be interactively selected. The

IDLitTool::ActivateManipulator method can be used to programmatically start a

manipulator. This can be especially useful when you need to reactivate a tool’s

default manipulator because none of the conditions required by a custom

manipulator have been met.

An IDLitManipulatorManager object is a specialized manipulator container that acts

as the root of a manipulator hierarchy. The manipulator manager is associated with an

IDLitWindow object via the window’s SetManipulatorManager method. The

manipulator manager passes information about the manipulator to observers such as

toolbars or menu items. See “IDLitManipulatorManager” (IDL Reference Guide) for

details.

Manipulator Visuals

An IDLitManipulatorVisual object is also known as a selection visual. A selection

visual appears when a manipulator is activated. Advanced manipulators can be

configured to interact with a selection visual, defining how a user can modify a

visualization. For example, Figure 8-1 displays objects based upon an

IDLitManipVisRotate object:

• IDLitManipVisRotate2D (used when the target is 2-D)

• IDLitManipVisRotateAxis (one for the x, y, and z axis, and used when the

target is 3-D)

The appearance of the selection visual depends upon whether the data is 2-D (left) or

3-D (right). In the case of 2-D data, the selection visuals indicate an area within the

visualization that will allow rotation when you left-click and drag the mouse cursor.

In the case of 3-D data, the selection visuals allow rotation around the x-, y-, or z-

axis, depending on which portion of the selection visual is selected.

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ITT Rule IDL Version 7.0 Manual do Utilizador Página 195