Kiviat

Kiviat is one of Pablo's display functional units.  It accepts as input a
vector of data values and maps each vector element to a location on a
corresponding axis within valid "minimum" and "maximum" ranges according
to the values set by the user at configuration time.  Kiviat axes are spoke
like and radiate from the origin of a circle.  A default option for Kiviat
is to connect the plotted points with a line and fill (or shade) the
resulting closed area with a color.

Clicking the left mouse button with the cursor inside the kiviat invokes a
callback displaying the axis closest to the cursor location and the data
value corresponding to the plotted point on that axis.


Functional Unit Inputs:  vector

Kiviat attributes:

	XtNheight	height (in pixels) of the kiviat widget
	XtNwidth	width (in pixels) of the kiviat widget
	XtNbackground	color of the widget drawing area background
	XtNfill		set to TRUE if the polygon of plotted points is to
			     be shaded
	XtNfaceBorderColor 	color of the lines used to draw the kiviat
				face (circle)
	XtNfillColor	color used to fill the point polygon
	XtNaxisColor	color used to draw the kiviat axes
	XtNnumaxes	number of axes used by the kiviat
	XtNminValue	minimum data value represented by the kiviat
	XtNmaxValue	maximum data value represented by the kiviat
	
