Class: ImageCompare::Image

Inherits:
ChunkyPNG::Image
  • Object
show all
Includes:
ColorMethods
Defined in:
lib/image_compare/image.rb

Instance Method Summary collapse

Methods included from ColorMethods

#blue, #brightness, #green, #orange, #red, #transparent, #yellow

Instance Method Details

#bounding_rect ⇒ Object 



59
60
61
 
# File 'lib/image_compare/image.rb', line 59

def bounding_rect
  Rectangle.new(0, 0, width - 1, height - 1)
end

#compare_each_pixel(image, area: nil) ⇒ Object 



18
19
20
21
22
23
24
25
26
27
28
 
# File 'lib/image_compare/image.rb', line 18

def compare_each_pixel(image, area: nil)
  area = bounding_rect if area.nil?
  (area.top..area.bot).each do |y|
    current_row = row(y) || []
    range = (area.left..area.right)
    next if image.row(y).slice(range) == current_row.slice(range)
    (area.left..area.right).each do |x|
      yield(self[x, y], image[x, y], x, y)
    end
  end
end

#each_pixel ⇒ Object 



9
10
11
12
13
14
15
16
 
# File 'lib/image_compare/image.rb', line 9

def each_pixel
  height.times do |y|
    current_row = row(y) || []
    current_row.each_with_index do |pixel, x|
      yield(pixel, x, y)
    end
  end
end

#highlight_rectangle(rect, color = :red) ⇒ Object

Raises:

  • (ArgumentError) 


52
53
54
55
56
57
 
# File 'lib/image_compare/image.rb', line 52

def highlight_rectangle(rect, color = :red)
  raise ArgumentError, "Undefined color: #{color}" unless respond_to?(color)
  return self if rect.nil?
  rect(*rect.bounds, send(color))
  self
end

#inspect ⇒ Object 



48
49
50
 
# File 'lib/image_compare/image.rb', line 48

def inspect
  "Image:#{object_id}<#{width}x#{height}>"
end

#sizes_match?(image) ⇒ Boolean

Returns:

  • (Boolean) 


44
45
46
 
# File 'lib/image_compare/image.rb', line 44

def sizes_match?(image)
  [width, height] == [image.width, image.height]
end

#to_grayscale ⇒ Object 



30
31
32
33
34
35
 
# File 'lib/image_compare/image.rb', line 30

def to_grayscale
  each_pixel do |pixel, x, y|
    self[x, y] = grayscale(brightness(pixel).round)
  end
  self
end

#with_alpha(value) ⇒ Object 



37
38
39
40
41
42
 
# File 'lib/image_compare/image.rb', line 37

def with_alpha(value)
  each_pixel do |pixel, x, y|
    self[x, y] = rgba(r(pixel), g(pixel), b(pixel), value)
  end
  self
end