Class _Geometry

source code

             object --+            
                      |            
utils.autonode.AutoNode --+        
                          |        
             common.ASTNode --+    
                              |    
                _CoordinateLike --+
                                  |
                                 _Geometry

Known Subclasses:

• AllSky
• , Box
• , Circle
• , Convex
• , _Compound
• , Ellipse
• , Polygon

A base class for all kinds of geometries.

Geometries may have "dependent" quantities like radii, sizes, etc. For those, the convention is that if they are 1D, they must be expressed in the first component of the position units, otherwise (in particular, for box size) in the full unit of the position. This has to be made sure by the client.

To make this work, Geometries are unit adapted on STC adoption. Since their dependents need to be adapted as well, they have to define adaptDependents(...) methods. They take the units for all dependent quantities (which may all be None). This is used in stxast.

Also getTransformed usually needs to be overridden for these.

Geometries may contain two sorts of column references; ordinary ones are just stand-ins of actual values, while GeometryColRefs describe the whole thing in a database column.