GR Programming Model
Every program that uses the GR interface will have these HDF
calls in it:
- Open a file and obtain a file identifier
- Hopen (hopen)
- Initialize the GR interface
- GRstart (mgstart)
- Create or open a GR image
- GRcreate (mgcreat) - create a GR image
GRselect (mgselct) - select a GR image
- Perform optional operations (reading writing, etc ..)
- Terminate access to the GR data set
- GRendaccess (mgendac)
- Terminate access to the GR interface
- GRend (mgend)
- Close the file
- Hclose (hclose)