The radar plugin shows the current viewing cone / area.
It can be used on a floor map image to show the current viewing direction and field of view on it.
Use the parent attribute to align in on a map image.
By using maskchildren="true" on the parent element it's
possible to draw the radar cone only with the parent layer.
The pano viewing direction can be changed by dragging the radar cone with the mouse (but could be disabled by adding enabled="false").
The position and size of it can by adjusted with the standard plugin attributes.