Built-in Mathematica Symbol

Locator

Locator[{x, y}]
represents a locator object at position {x, y} in a graphic.

Locator[Dynamic[pos]]
takes the position to be the dynamically updated current value of pos, with this value being reset if the locator object is moved.

Locator[{x, y}, obj]
displays obj as the locator object.

Locator[{x, y}, None]
displays nothing visible as the locator object.

MORE INFORMATION

Locator[{x, y}, Automatic] uses the default "crosshairs" appearance for the locator object.

Locator[Dynamic[{x, y}]] will reset the values of x and y when the locator object is moved; Locator[{x, y}] will not.

Locator[Dynamic[{x, y}], None] gives no directly visible indication of position, but can be used in conjunction with a construct such as Point[Dynamic[{x, y}]]. »

Locator objects that appear inside Deploy[expr] can still be manipulated interactively, just like, for example, Slider objects. »

If obj does not define its own absolute size, its size when used as a locator object can be specified using the ImageSize option of Locator.

The setting for ImageSize can be Tiny, Small, Medium, Large, or an explicit value in printer's points. »

The center of the locator object is taken to be the setting for the AlignmentPoint option of obj, or by default, the center of the bounding box for obj.

The following options can be given:

AutoAction	False	whether to move automatically when the mouse is over the graphic
Enabled	Automatic	whether the locator is enabled, or grayed out
ImageSize	Automatic	the size of the displayed locator object
LocatorRegion	Automatic	where the locator object should be allowed to go

Locator[] is equivalent to Locator[Scaled[{0.5, 0.5}]]. »

Locator can be used to specify the control for a variable in Manipulate, to indicate that the value of the variable should be determined by the position of a locator. »