Class: NSWTopo::Layer

Inherits:
Object
  • Object
show all
Defined in:
lib/nswtopo/layer.rb

Constant Summary collapse

TYPES = 
Set[Vegetation, Import, ColourMask, ArcGISRaster, Feature, Contour, Spot, Overlay, Relief, Grid, Declination, Control, Labels]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, map, params) ⇒ Layer

Returns a new instance of Layer.



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# File 'lib/nswtopo/layer.rb', line 25

def initialize(name, map, params)
  params.delete("min-version").then do |creator_string|
    creator_string ? Version[creator_string] : VERSION
  rescue Version::Error
    raise "layer '%s' has unrecognised version: %s" % [name, creator_string]
  end.then do |min_version|
    raise "layer '%s' requires nswtopo %s, this version: %s" % [name, min_version, VERSION] unless min_version <= VERSION
  end

  @type = begin
    NSWTopo.const_get params["type"]
  rescue NameError, TypeError
  end

  raise "layer '%s' has unrecognised type: %s" % [name, params["type"].inspect] unless TYPES === @type
  extend @type

  @params = @type.const_defined?(:DEFAULTS) ? @type.const_get(:DEFAULTS).transform_keys(&:to_s).deep_merge(params) : params
  @name, @map, @source, @path, resolution, ppi = Layer.sanitise(name), map, @params.delete("source"), @params.delete("path"), @params.delete("resolution"), @params.delete("ppi")
  @mm_per_px = ppi ? 25.4 / ppi : resolution ? @map.to_mm(resolution) : nil

  @type.const_get(:CREATE).map(&:to_s).each do |attr|
    instance_variable_set ?@ + attr.tr_s(?-, ?_), @params.delete(attr)
  end if @type.const_defined?(:CREATE)
end

Instance Attribute Details

#name ⇒ Object (readonly) Also known as: to_s

Returns the value of attribute name.



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# File 'lib/nswtopo/layer.rb', line 51

def name
  @name
end

#params ⇒ Object (readonly)

Returns the value of attribute params.



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# File 'lib/nswtopo/layer.rb', line 51

def params
  @params
end

Class Method Details

.sanitise(name) ⇒ Object 



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# File 'lib/nswtopo/layer.rb', line 89

def self.sanitise(name)
  name&.tr_s '^_a-zA-Z0-9*\-', ?.
end

Instance Method Details

#<=>(other) ⇒ Object 



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# File 'lib/nswtopo/layer.rb', line 72

def <=>(other)
  self.level <=> other.level
end

#==(other) ⇒ Object 



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# File 'lib/nswtopo/layer.rb', line 76

def ==(other)
  Layer === other && self.name == other.name
end

#level ⇒ Object 



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# File 'lib/nswtopo/layer.rb', line 54

def level
  case
  when Import       == @type then 0
  when ArcGISRaster == @type then 0
  when Vegetation   == @type then 1
  when ColourMask   == @type then 2
  when Feature      == @type then 3
  when Contour      == @type then 3
  when Spot         == @type then 3
  when Overlay      == @type then 4
  when Relief       == @type then 5
  when Grid         == @type then 6
  when Declination  == @type then 7
  when Control      == @type then 8
  when Labels       == @type then 99
  end
end

#pair ⇒ Object 



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# File 'lib/nswtopo/layer.rb', line 85

def pair
  return name, params
end

#uptodate? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/nswtopo/layer.rb', line 80

def uptodate?
  mtimes = [@source&.mtime, @map.mtime(filename)]
  mtimes.all? && mtimes.inject(&:<)
end