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