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- Accessing spatial data: using spatial indexes
GeometryWithin (Function) In french: GéométrieEstContenu Determines whether geometry A is completely within geometry B (i.e., geometry B completely contains geometry A). In this case: - No point of geometry A lies outside geometry B: all points of geometry A are either in the interior or on the boundary of geometry B.
- The interiors of B and A have at least one point in common.
o2DPolygon_1 is Polygon2D
Linestring2DAddPoint(o2DPolygon_1.Outline, -4.00, -4.00)
Linestring2DAddPoint(o2DPolygon_1.Outline, -4.00, 2.00)
Linestring2DAddPoint(o2DPolygon_1.Outline, 5.00, 2.00)
Linestring2DAddPoint(o2DPolygon_1.Outline, 5.00, -4.00)
Linestring2DAddPoint(o2DPolygon_1.Outline, -4.00, -4.00)
o2DPolygon_2 is Polygon2D
Linestring2DAddPoint(o2DPolygon_2.Outline, -1.00, -2.00)
Linestring2DAddPoint(o2DPolygon_2.Outline, 2.00, 0.00)
Linestring2DAddPoint(o2DPolygon_2.Outline, 2.00, -2.00)
Linestring2DAddPoint(o2DPolygon_2.Outline, -1.00, -2.00)
let p2_in_p1 = GeometryContain(o2DPolygon_1, o2DPolygon_2)
GeometryWithin(o2DPolygon_2, o2DPolygon_1)
Syntax
<Result> = GeometryWithin(<Geometry A> , <Geometry B>)
<Result>: Boolean - True if geometry A is contained within geometry B,
- False otherwise.
If an error occurs, the ErrorOccurred variable is set to True. To get more details on the error, use ErrorInfo with the errMessage constant.
<Geometry A>: Variable containing spatial data Variable corresponding to the first geometry. This geometry can correspond to one of the following variable types: <Geometry B>: Variable containing spatial data Variable corresponding to the second geometry. This geometry can correspond to one of the following variable types: Remarks GeometryWithin is similar to GeometryCoveredBy. However, GeometryCoveredBy does not require the interiors of both geometries to have a point in common. A polygon covers its own boundary, but it does not contain it. Accessing spatial data: using spatial indexes In a data file, you can apply a filter on spatial data and loop through the file. For example, the filter can be based on the result of GeometryWithin. It is recommended to use the following syntax to apply a filter on spatial data: FOR EACH File WHERE WLanguage_function(File.Spatial_item, Spatial_variable) where: - WLanguage_function corresponds to GeometryWithin.
- Spatial_item is a spatial item in the data file. This item must:
- be of type "Geographic data" or "Geometric data".
- be defined as a "Spatial key".
- Spatial_variable is a given spatial variable, used for comparison with the spatial item. This variable can be of type PolygonGeo, Polygon2D, etc.
Remark: The "FOR EACH File" syntax is available but not recommended, as it doesn't use spatial indexes and is therefore not optimized. In this case, the entire data file is looped through: spatial indexes are not used. FOR EACH File IF WLanguage_function(File.Spatial_item, Spatial_variable) = True THEN ... END END Example:
polyGeo is PolygonGeo
polyGeo.Outline.AddPoint(0n48.8187479172765, 0n1.9550104465229536)
polyGeo.Outline.AddPoint(0n48.685649220185574, 0n2.023674998054354)
polyGeo.Outline.AddPoint(0n48.82612543243871, 0n2.2106580854197566)
polyGeo = GeometryCorrect(polyGeo)
NumberOfRecords is int
FOR EACH MunicipalityData where GeometryWithin(MunicipalityData.geometry, polyGeo)
Trace(MunicipalityData.MunicipalityName)
END
Business / UI classification: Business Logic
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