Class: ImageCompare::Matcher

Inherits:
Object
  • Object
show all
Defined in:
lib/image_compare/matcher.rb

Constant Summary collapse

MODES = 
{
  rgb: "RGB",
  delta: "Delta",
  grayscale: "Grayscale",
  color: "Color"
}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(**options) ⇒ Matcher

Returns a new instance of Matcher.

Raises:

  • (ArgumentError) 


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# File 'lib/image_compare/matcher.rb', line 18

def initialize(**options)
  mode_type = options.delete(:mode) || :color
  raise ArgumentError, "Undefined mode: #{mode_type}" unless MODES.key?(mode_type)
  @mode = Modes.const_get(MODES[mode_type]).new(**options)
end

Instance Attribute Details

#mode ⇒ Object (readonly)

Returns the value of attribute mode.



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# File 'lib/image_compare/matcher.rb', line 16

def mode
  @mode
end

Instance Method Details

#compare(a, b) ⇒ Object 



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# File 'lib/image_compare/matcher.rb', line 24

def compare(a, b)
  a = Image.from_file(a) unless a.is_a?(Image)
  b = Image.from_file(b) unless b.is_a?(Image)

  unless a.sizes_match?(b)
    raise(
      SizesMismatchError,
      "Size mismatch: first image size: #{a.width}x#{a.height}, second image size: #{b.width}x#{b.height}"
    )
  end

  image_area = Rectangle.new(0, 0, a.width - 1, a.height - 1)

  unless mode.include_rect.nil?
    unless image_area.contains?(mode.include_rect)
      raise ArgumentError, "Bounds must be in image"
    end
    unless mode.exclude_rect.nil?
      unless mode.include_rect.contains?(mode.exclude_rect)
        raise ArgumentError, "Included area must contain excluded"
      end
    end
  end

  mode.compare(a, b)
end