Class: Djatoka
- Inherits:
-
Object
- Object
- Djatoka
- Includes:
- HTTParty
- Defined in:
- vendor/plugins/hydra_repository/lib/djatoka.rb
Class Method Summary (collapse)
- + (Object) get_image(source_url, options = {})
-
+ (Object) region(source_url, region_value, options = {})
Uses Djatoka to retrieve a redion of the image from @source_url according to @scale_value Accepts optional hash that will be passed through to djatoka as-is scale_value is passed through to djatoka as svc.scale.
-
+ (Object) scale(source_url, scale_value, options = {})
Uses Djatoka to scale the image from @source_url according to @scale_value Accepts optional hash that will be passed through to djatoka as-is scale_value is passed through to djatoka as svc.scale.
Class Method Details
+ (Object) get_image(source_url, options = {})
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# File 'vendor/plugins/hydra_repository/lib/djatoka.rb', line 46 def self.get_image(source_url, ={}) .merge!({:svc_id => "info:lanl-repo/svc/getRegion", :rft_id=>source_url, "svc.format"=>"image/jpeg"}) puts "get_region options: #{options.inspect}" get("", :query => ) end |
+ (Object) region(source_url, region_value, options = {})
Uses Djatoka to retrieve a redion of the image from @source_url according to @scale_value Accepts optional hash that will be passed through to djatoka as-is scale_value is passed through to djatoka as svc.scale. From the Djatoka docs: svc.region - Y,X,H,W.
Y is the down inset value (positive) from 0 on the y axis at the max image resolution.
X is the right inset value (positive) from 0 on the x axis at the max image resolution.
H is the height of the image provided as response.
W is the width of the image provided as response.
All values may either be absolute pixel values (e.g. 100,100,256,256), float values (e.g. 0.1,0.1,0.1,0.1), or a combination (e.g. 0.1,0.1,256,256).
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# File 'vendor/plugins/hydra_repository/lib/djatoka.rb', line 41 def self.region(source_url, region_value, ={}) .merge!("svc.region"=>region_value) get_image(source_url, ) end |
+ (Object) scale(source_url, scale_value, options = {})
Uses Djatoka to scale the image from @source_url according to @scale_value Accepts optional hash that will be passed through to djatoka as-is scale_value is passed through to djatoka as svc.scale. From the Djatoka docs: svc.scale - Request specific output size by scaling extracted resource. Option 1) Define a long-side dimension (e.g., svc.scale=96)
Nearest resolution level, rounded up, is used for level parameter
Uses the aspect ratio to calculate second value
Option 2) Define absolute w,h values (e.g. 1024,768)
Images is scaled to the dimensions you specify.
Value must be less than 2X current resolution
Option 3) Define a single dimension (e.g. 1024,0) with or without Level Parameter
Uses the aspect ratio to calculate second value
Option 4) Use a single decimal scaling factor (e.g. 0.854)
Current resolution = 1.0
50% Resolution = 0.5
150% Resolution = 1.5
Value must be greater than 0 and less than 2
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# File 'vendor/plugins/hydra_repository/lib/djatoka.rb', line 26 def self.scale(source_url, scale_value, ={}) .merge!("svc.scale"=>scale_value) get_image(source_url, ) end |