63 lines
1.7 KiB
Ruby
63 lines
1.7 KiB
Ruby
require_dependency 'carto/bounding_box_service'
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module Carto::MapBoundaries
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MAXIMUM_ZOOM = 18
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def set_default_boundaries!
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bounds = get_map_bounds
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bounds ? set_viewport_from_bounds(bounds) : set_default_viewport
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save
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rescue StandardError => exception
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log_error(exception: exception, message: 'Error setting default bounds')
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end
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def recalculate_bounds!
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set_boundaries(get_map_bounds || Carto::BoundingBoxUtils::DEFAULT_BOUNDS)
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save
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end
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private
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def set_viewport_from_bounds(bounds)
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set_boundaries(bounds)
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recenter_using_bounds(bounds)
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recalculate_zoom(bounds)
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end
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def set_default_viewport
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set_boundaries(Carto::BoundingBoxUtils::DEFAULT_BOUNDS)
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self.center = Carto::Map::DEFAULT_OPTIONS[:center]
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self.zoom = Carto::Map::DEFAULT_OPTIONS[:zoom]
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end
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def set_boundaries(bounds)
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# switch to (lat,lon) for the frontend
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self.view_bounds_ne = "[#{bounds[:maxy]}, #{bounds[:maxx]}]"
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self.view_bounds_sw = "[#{bounds[:miny]}, #{bounds[:minx]}]"
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end
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def recenter_using_bounds(bounds)
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x = (bounds[:maxx] + bounds[:minx]) / 2
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y = (bounds[:maxy] + bounds[:miny]) / 2
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self.center = "[#{y},#{x}]"
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end
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def recalculate_zoom(bounds)
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latitude_size = bounds[:maxy] - bounds[:miny]
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longitude_size = bounds[:maxx] - bounds[:minx]
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# Don't touch zoom if the table is empty or has no bounds
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return if longitude_size.zero? && latitude_size.zero?
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zoom = -1 * ((Math.log([longitude_size, latitude_size].max) / Math.log(2)) - (Math.log(360) / Math.log(2)))
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zoom = [[zoom.round, 1].max, MAXIMUM_ZOOM].min
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self.zoom = zoom
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end
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def get_map_bounds
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# (lon,lat) as comes out from postgis
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Carto::BoundingBoxService.new(user, table_name).table_bounds
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end
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end
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