module RPClustering::RGeo::ActiveRecord::ArelTableSpatialExpressions
Spatial Expressions to be attached to Arel Table (DB tables)
Public Instance Methods
st_astext(g)
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ST_AsText: www.postgis.org/docs/ST_AsText.html
Returns a string (WKT)
# File lib/rp_clustering-rgeo-activerecord/arel_table_spatial_expressions.rb, line 51 def st_astext(g) args = [g] ::RGeo::ActiveRecord::SpatialNamedFunction.new( 'ST_AsText', args, [true, true] ) end
st_centroid(g)
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ST_Centroid: www.postgis.org/docs/ST_Centroid.html
Implements postgis function variant:
geometry ST_Centroid(geometry g1);
Returns a geometry
# File lib/rp_clustering-rgeo-activerecord/arel_table_spatial_expressions.rb, line 68 def st_centroid(g) args = [g] ::RGeo::ActiveRecord::SpatialNamedFunction.new( 'ST_Centroid', args, [true, true] ) end
st_collect(g1_array)
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ST_Collect: www.postgis.org/docs/ST_Collect.html
Implements postgis function variant:
geometry ST_Collect(geometry[] g1_array);
This variant is an aggregate, it operates on rows of data.
Returns a geometry collection
# File lib/rp_clustering-rgeo-activerecord/arel_table_spatial_expressions.rb, line 38 def st_collect(g1_array) args = [g1_array] ::RGeo::ActiveRecord::SpatialNamedFunction.new( 'ST_Collect', args, [true, true] ) end
st_minimumboundingcircle(g, num_segs=nil)
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ST_MinimumBoundingCircle: www.postgis.org/docs/ST_MinimumBoundingCircle.html
Implements postgis function variant:
geometry ST_MinimumBoundingCircle(geometry geomA, integer num_segs_per_qt_circ=48);
Returns a geometry
# File lib/rp_clustering-rgeo-activerecord/arel_table_spatial_expressions.rb, line 84 def st_minimumboundingcircle(g, num_segs=nil) args = [g] spatial_flags = [true, true] if num_segs args << num_segs.to_s spatial_flags << false end ::RGeo::ActiveRecord::SpatialNamedFunction.new( 'ST_MinimumBoundingCircle', args, spatial_flags ) end
st_snaptogrid(geom_a, grid_size)
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ST_SnapToGrid: www.postgis.org/docs/ST_SnapToGrid.html
Implements postgis function variant:
geometry ST_SnapToGrid(geometry geomA, float size);
Returns a geometry collection
# File lib/rp_clustering-rgeo-activerecord/arel_table_spatial_expressions.rb, line 19 def st_snaptogrid(geom_a, grid_size) args = [geom_a, grid_size.to_s] ::RGeo::ActiveRecord::SpatialNamedFunction.new( 'ST_SnapToGrid', args, [true, true, false] ) end