debian man page for quadrangle

quadrangle(7rheolef)						    rheolef-6.1 					      quadrangle(7rheolef)

NAME
       quadrangle - Quadrangular reference element

DESCRIPTION
       The quadrangular reference element is [-1,1]^2.

NUMBERING
	     y

	     3---------2
	     |	       |
	     |	       |
	     |	       |
	     |	       |
	     0---------1   x

       Curved  high  order Pk quadrangles (k >= 1), in 2d or 3d geometries, are supported.  These quadrangles have additional edge-nodes and face-
       nodes.

THESE NODES ARE NUMBERED AS
	first vertex, then edge-node, following the edge numbering order and orientation, and finally the face internal nodes, following the quad-
       rangle lattice.	See below for edge numbering and orientation.

	     3-----6-----2   3---9---8---2
	     |		 |   |		 |
	     |		 |  10	14  15	 7
	     7	   8	 5   |		 |
	     |		 |  11	12  13	 6
	     |		 |   |		 |
	     0-----4-----1   0---4---5---1
		   P2		   P3

IMPLEMENTATION
       const size_t dimension = 2;
       const Float  measure = 4;
       const size_t n_vertex = 4;
       const Float vertex [n_vertex][dimension] = {
	       { -1,-1 },
	       {  1,-1 },
	       {  1, 1 },
	       { -1, 1 } };
       const size_t  n_edge = 4;
       const size_t edge [n_edge][2] = {
	       { 0, 1 },
	       { 1, 2 },
	       { 2, 3 },
	       { 3, 0 } };

rheolef-6.1							    rheolef-6.1 					      quadrangle(7rheolef)