+=head2 Hexagon data
+
+Some pre-calculated data is available.
+
+=head3 double HL_fand[16]
+
+An array of hexagon coordinates, with the hex center x,y at indexes 0 and
+1 (these are 0.0,0.0), and each vertex following. The first vertex
+is repeated at the end of the array. Each vertex takes up two consecutive
+array elements for it's X and Y coordinates. Thus for hex vertexes 1 to
+6, and hex center C this array is CxCy1x1y2x2y3x3y4x4y5x5y6x6y1x1y.
+This is suitable for passing directly to opengl for drawing a hexagon
+as a triangle fan.
+
+=head3 float HL_fanf[16]
+
+An array of floats, laid out the same way as HL_fand.
+
+=head3 double HL_hfand[16]
+
+This is the same as HL_fand, but will draw a horizontal hex. The same
+effect could be had by rotating 90 degrees.
+
+=head3 float HL_hfanf[16]
+
+An array of float with horizontal layout.
+