Module: Alchemy::Picture::Calculations

Included in:
Alchemy::Picture
Defined in:
app/models/alchemy/picture/calculations.rb

Instance Method Summary collapse

Instance Method Details

#can_be_cropped_to?(string, upsample = false) ⇒ Boolean

An Image smaller than dimensions can not be cropped to given size - unless upsample is true.

Returns:

  • (Boolean) 


9
10
11
12
13
 
# File 'app/models/alchemy/picture/calculations.rb', line 9

def can_be_cropped_to?(string, upsample = false)
  return true if upsample

  is_bigger_than? sizes_from_string(string)
end

#image_size ⇒ Object

This function returns the :width and :height of the image file as a Hash



47
48
49
50
51
52
 
# File 'app/models/alchemy/picture/calculations.rb', line 47

def image_size
  {
    width: image_file_width,
    height: image_file_height,
  }
end

#is_bigger_than?(dimensions) ⇒ Boolean

Returns true if both dimensions of the base image are bigger than the dimensions hash.

Returns:

  • (Boolean) 


17
18
19
 
# File 'app/models/alchemy/picture/calculations.rb', line 17

def is_bigger_than?(dimensions)
  image_file_width > dimensions[:width] && image_file_height > dimensions[:height]
end

#is_smaller_than?(dimensions) ⇒ Boolean

Returns true is one dimension of the base image is smaller than the dimensions hash.

Returns:

  • (Boolean) 


23
24
25
 
# File 'app/models/alchemy/picture/calculations.rb', line 23

def is_smaller_than?(dimensions)
  !is_bigger_than?(dimensions)
end

#sizes_from_string(string = "0x0") ⇒ Object

Given a string with an x, this function returns a Hash with point :width and :height.

Raises:

  • (ArgumentError) 


30
31
32
33
34
35
36
37
38
39
40
41
42
43
 
# File 'app/models/alchemy/picture/calculations.rb', line 30

def sizes_from_string(string = "0x0")
  string = "0x0" if string.nil? || string.empty?

  raise ArgumentError unless string =~ /(\d*x\d*)/

  width, height = string.scan(/(\d*)x(\d*)/)[0].map(&:to_i)

  width = 0 if width.nil?
  height = 0 if height.nil?
  {
    width: width,
    height: height,
  }
end