Class: PhotoUtils::Camera

Inherits:
Object
  • Object
show all
Defined in:
lib/photo_utils/camera.rb

Constant Summary collapse

CAMERAS_PATH = 
Path.new(ENV['HOME']) / '.cameras.rb'

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params = {}) ⇒ Camera

Returns a new instance of Camera.



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# File 'lib/photo_utils/camera.rb', line 37

def initialize(params={})
  if params[:format]
    params[:formats] = [params.delete(:format)]
  end
  params.each { |k, v| send("#{k}=", v) }
  @format ||= @formats.first
  normal = @format.frame.diagonal
  # set the lens to the one closest to normal (diagonal of frame)
  @lens = @lenses.sort_by { |l| (normal - l.focal_length).abs }.first
  @shutter = @max_shutter
end

Instance Attribute Details

#format ⇒ Object

Returns the value of attribute format.



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# File 'lib/photo_utils/camera.rb', line 30

def format
  @format
end

#formats ⇒ Object

Returns the value of attribute formats.



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# File 'lib/photo_utils/camera.rb', line 29

def formats
  @formats
end

#lens ⇒ Object

Returns the value of attribute lens.



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# File 'lib/photo_utils/camera.rb', line 35

def lens
  @lens
end

#lenses ⇒ Object

Returns the value of attribute lenses.



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# File 'lib/photo_utils/camera.rb', line 34

def lenses
  @lenses
end

#max_shutter ⇒ Object

Returns the value of attribute max_shutter.



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# File 'lib/photo_utils/camera.rb', line 32

def max_shutter
  @max_shutter
end

#min_shutter ⇒ Object

Returns the value of attribute min_shutter.



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# File 'lib/photo_utils/camera.rb', line 31

def min_shutter
  @min_shutter
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/photo_utils/camera.rb', line 28

def name
  @name
end

#shutter ⇒ Object

Returns the value of attribute shutter.



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# File 'lib/photo_utils/camera.rb', line 33

def shutter
  @shutter
end

Class Method Details

.[](name) ⇒ Object 



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# File 'lib/photo_utils/camera.rb', line 24

def self.[](name)
  find(name: name)
end

.cameras ⇒ Object 



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# File 'lib/photo_utils/camera.rb', line 7

def self.cameras
  unless class_variable_defined?('@@cameras')
    if CAMERAS_PATH.exist?
      @@cameras = eval(CAMERAS_PATH.read)
    end
  end
  @@cameras
end

.find(params) ⇒ Object 



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# File 'lib/photo_utils/camera.rb', line 16

def self.find(params)
  if (sel = params[:name])
    cameras.find { |c| sel === c.name }
  else
    raise "Don't know how to search for camera with params: #{params.inspect}"
  end
end

Instance Method Details

#angle_of_view ⇒ Object 



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# File 'lib/photo_utils/camera.rb', line 61

def angle_of_view
  raise "Need focal length and format size to determine angle of view" unless @lens && @lens.focal_length && @format
  @format.angle_of_view(@lens.focal_length)
end

#print(io = STDOUT) ⇒ Object 



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# File 'lib/photo_utils/camera.rb', line 66

def print(io=STDOUT)
  io.puts "#{@name}: format: #{@format}, shutter: #{@max_shutter} - #{@min_shutter}"
  @lenses.sort_by(&:focal_length).each do |lens|
    io.puts "\t%s %s: focal length: %s (35mm equiv: %s), aperture: %s~%s" % [
      lens == self.lens ? '*' : ' ',
      lens.name,
      lens.focal_length.format_metric(1),
      @format.focal_length_equivalent(lens.focal_length).format_metric(1),
      lens.max_aperture,
      lens.min_aperture,
    ]
  end
end