Class: Sinatra::AssetPack::Image

Inherits:
Object
  • Object
show all
Defined in:
lib/sinatra/assetpack/image.rb

Overview

An image.

Common usage

i = Image['/app/images/background.png']    # Local file path

i.dimensions     # Tuple for [ width, height ]
i.width
i.height

i.dimensions?    # True if dimensions are available
                 # (e.g., if ImageMagick is installed and working)

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ Image

Returns a new instance of Image.



26
27
28
 
# File 'lib/sinatra/assetpack/image.rb', line 26

def initialize(file)
  @file = file
end

Class Method Details

.[](fname) ⇒ Object

Looks up an image. This makes each image only have one associated instance forever.



19
20
21
22
23
24
 
# File 'lib/sinatra/assetpack/image.rb', line 19

def self.[](fname)
  fname = File.expand_path(fname) || fname

  @cache        ||= Hash.new
  @cache[fname] ||= new fname
end

Instance Method Details

#dimensions ⇒ Object 



30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
 
# File 'lib/sinatra/assetpack/image.rb', line 30

def dimensions
  return @dimensions  unless @dimensions.nil?

  dim = /(\d+) x (\d+)/.match(`file "#{@file}"`)
  w, h = dim[1,2]

   if w.to_i != 0 && h.to_i != 0
     @dimensions = [w.to_i, h.to_i]
   else
     @dimensions = false
   end

rescue => e
  @dimensions = false
end

#dimensions? ⇒ Boolean

Returns:

  • (Boolean) 


46
47
48
 
# File 'lib/sinatra/assetpack/image.rb', line 46

def dimensions?
  !! dimensions
end

#height ⇒ Object 



54
55
56
 
# File 'lib/sinatra/assetpack/image.rb', line 54

def height
  dimensions? && dimensions[1]
end

#width ⇒ Object 



50
51
52
 
# File 'lib/sinatra/assetpack/image.rb', line 50

def width
  dimensions? && dimensions[0]
end