astGetRegionMeshastGetRegionMesh
-
Return a mesh of points covering the surface or volume of a Region
- Description:
- This function
returns the axis values at a mesh of points either covering the
surface (i.e. boundary) of the supplied RegionRegion, or filling the
interior (i.e. volume) of the Region. The number of points in
the mesh is approximately equal to the MeshSizeMeshSize attribute.
- Synopsis:
- void astGetRegionMesh( AstRegion
this, int surface, int maxpoint,
int maxcoord, int
npoint, double
points )
- Parameters:
-
this
-
Pointer to the Region.
-
surface
-
If non-zero,
the returned points will cover the surface or the Region.
Otherwise, they will fill the interior of the Region.
-
maxpoint
-
If zero, the number of points in the mesh is returned in
"
npoint",
but no axis values are returned and all other parameters are ignored.
If not zero, the supplied value should be the length of the
second dimension of the "points"
array. An error is reported if the number of points in the mesh
exceeds this number.
-
maxcoord
-
The length of the
first dimension of the "points" array.
An error is reported if the number of axes in the supplied Region
exceeds this number.
-
npoint
-
A pointer to an integer in which to return the
number of points in the returned mesh.
-
points
-
The address of the first element in a 2-dimensional array of
shape "[maxcoord][maxpoint]", in which to return the coordinate
values at the mesh positions. These are stored such that the
value of coordinate number "coord" for point number "point" is
found in element "points[coord][point]".
- Notes:
- If the coordinate system represented by the Region has been
changed since it was first created, the returned axis values refer
to the new (changed) coordinate system, rather than the original
coordinate system. Note however that if the transformation from
original to new coordinate system is non-linear, the shape within
the new coordinate system may be distorted, and so may not match
that implied by the name of the Region subclass (CircleCircle, BoxBox, etc).