Altair® Panopticon


Needle Graph Settings

Needle Graphs display time-based transactions or occurrence frequencies, rather than time-based trends. They are simply time-based Bar Graphs where each bar is located at a particular time point on the axis.

They work especially well when combined with a Line Graph.

The most common use of a Needle Graph is when showing the trading volume for a stock, typically underneath the price performance.

The needle graph settings pane is displayed after clicking the Options  button.




Needle Width

Specifies the width in pixels for each needle:

Set Width to Time Slice

Determines whether the Needle width will be extended to the width of the time slice.

NOTE: Will not go past a null/empty time slice.

Show Borders


Determines whether borders are drawn around needles. These are only visible if the Needle Width is greater than 1 pixel.

Show Coordinates

Determines whether the graph coordinates (i.e., X-Y plots, or Date/Time-Y plots) on mouse over are displayed in the visualization.



Other visualization-specific properties can be set by clicking on the Y-Axis variable drop area and then selecting the Y-Axis tab:




Independent Y-Axis Scaling

Determines whether to have each visualization Y-axis in a cross tab automatically scaled independent of the others.