A bullet gauge is a
dashboard indicator that compares an actual value to a target value
and compares them in intervals. The actual value of the primary measure
is indicated by an inset horizontal bar.
Note that the scale
of a bullet gauge often begins at zero, but it can contain both positive
and negative values if both types of values apply to the primary measure,
such as profit. The inset horizontal bar should always begin at zero
so that comparing multiple bullet graphs is not confusing.
The bullet gauge requires
a primary measure and a range display rule, and the target measure
is optional. The default orientation is horizontal with an option
to display the gauge vertically.