52 lines
1.7 KiB
Ruby
52 lines
1.7 KiB
Ruby
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module Carto::BoundingBoxUtils
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DEFAULT_BOUNDS = {
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minx: -179,
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maxx: 179,
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miny: -85.0511,
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maxy: 85.0511
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}.freeze
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LIMIT_BOUNDS = {
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minx: -180,
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maxx: 180,
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miny: -90,
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maxy: 90
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}.freeze
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def self.bound_for(value, minimum, maximum)
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[[value, DEFAULT_BOUNDS.fetch(minimum)].max, DEFAULT_BOUNDS.fetch(maximum)].min
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end
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def self.to_polygon(minx, miny, maxx, maxy)
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return nil unless check_bounds_for(minx, miny) && check_bounds_for(maxx, maxy)
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"ST_Transform(ST_Envelope('SRID=4326;POLYGON((" \
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"#{minx} #{miny}, #{minx} #{maxy}, #{maxx} #{maxy}, #{maxx} #{miny}, #{minx} #{miny}" \
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"))'::geometry), 3857)"
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end
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def self.to_point(x, y)
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return nil unless check_bounds_for(x, y)
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%[ST_GeomFromText('POINT(#{x} #{y})',3857)]
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end
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def self.parse_bbox_parameters(bounding_box)
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bbox_coords = bounding_box.split(',').map { |coord| Float(coord) }.compact
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unless bbox_coords.length == 4
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raise CartoDB::BoundingBoxError.new('bounding box must have 4 coordinates: minx, miny, maxx, maxy')
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end
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{ minx: bbox_coords[0], miny: bbox_coords[1], maxx: bbox_coords[2], maxy: bbox_coords[3] }
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rescue ArgumentError
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raise CartoDB::BoundingBoxError.new('all bounding box parameters must be floats')
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end
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def self.check_bounds_for(x, y)
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return false if Float(x) > LIMIT_BOUNDS[:maxx].to_f || Float(x) < LIMIT_BOUNDS[:minx].to_f
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return false if Float(y) > LIMIT_BOUNDS[:maxy].to_f || Float(y) < LIMIT_BOUNDS[:miny].to_f
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true
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rescue
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# Reject coordinate values for which Float() conversion fails.
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# e.g. nil values or Strings that do not contain just a valid numeric representation.
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false
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end
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end
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