Hi all, I'm reading the GRASS7 programmer's manual, to update my experience with GRASS (I'm going to use it for some network analysis, and probably I will need to extend it) Looking at the topology examples [1] I fill a bit confused by the "types" of nodes and lines, which vary between the different kind of topological structures.
- Point example: a point doesn't have nodes but have a line (P_LINE), with type GV_POINT. It's enough for me to get confused :) A P_LINE structure has a void * topo opaque element [2], which will point to the relative topology structure depending on the type. In case of a G_POINT type, what is the topology structure attached to the topo pointer? - Line example: two nodes with type GV_LINE. A P_NODE doesn't have a type [3], so how can it be... a GV_LINE? :( I'm missing something. Could you help to understand it? Thanks a lot, giovanni [1] http://grass.osgeo.org/programming7/vlibTopology.html#vlibTopoExamples [2] http://grass.osgeo.org/programming7/structP__line.html [3] http://grass.osgeo.org/programming7/structP__node.html -- Giovanni Allegri http://about.me/giovanniallegri blog: http://blog.spaziogis.it GEO+ geomatica in Italia http://bit.ly/GEOplus
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