OOF2: The Manual

3.5. Active Area

Active Areas provide a way of restricting OOF2 operations to a subset of a Microstructure. They are manipulated by the commands in the OOF.ActiveArea menu. See that section for a more detailed discussion.

The Active Area Page, as shown in Figure 3.6, contains a Microstructure Chooser, a Status Pane, a Named Area Pane, and a Modification Pane. Active Areas are specific to a particular Microstructure. The Chooser selects which Microstructure's Active Area is being addressed by the rest of the page. The Status Pane simply states how many pixels are currently active in the current Microstructure.

Figure 3.6. The Active Area Page

The Active Area Page

The Named Area Pane

The Named Area Pane contains the machinery needed to give names to Active Areas and store them for later use. The bulk of the pane is a list of named areas. Clicking on a name in the list selects it. Double-clicking on a name is equivalent to single-clicking and using the Restore button. The buttons at the bottom of the pane operate on the selected Active Area:

  • The Store button stores the current ActiveArea (the currently active pixels in the current Microstructure) and assigns a name to it. The newly named area will be selected in the Named Area list.

  • The Rename button renames the Active Area that's currently selected in the list.

  • The Delete button deletes the currently selected Active Area from the list.

  • The Restore button activates the selected Active Area. That is, the named stored Active Area becomes the Microstructure's current Active Area. Clicking on the Restore button is equivalent to double-clicking a name in the list.

The Modification Pane

The Active Area Modification pane is similar to the Modification Panes in the Image and Pixel Selection pages. At the top is a pull-down menu of methods of modifying the Active Area of the current Microstructure. The modifiers in this menu correspond to commands in the OOF.ActiveArea menu. Modifiers that require additional arguments display them in the region below the menu. Below this are a set of buttons:

  • The OK performs the action specified by the currently selected modifier.

  • The Undo and Redo buttons undo and redo the most recent changes to the Active Area.

  • The Prev and Next buttons cycle the Modifier Chooser through the most recently used modifiers. These buttons have no direct effect on the current Active Area.

  • The Override button makes the whole Microstructure active as long as the button is pressed. Unlike the other buttons on the page, when the Override button is pressed, it stays pressed. It must be pressed again to release it. Figure 3.7 shows the two states of the button, unpressed (on the left) and pressed (on the right).

    Figure 3.7. The Override Button

    The Override Button