3. Examples

3.1 Made with RubyCocoa

Here are a few graphs from the gruff test suite, all made with RubyCocoa and CocoaMagick (trust me about that, I still haven’t gotten RMagick installed on my Mac!):

3.2 Generate them yourself

To generate these yourself, download gruff from rubyforge. Get the .tgz version and unpack it somewhere convenient. Put CocoaMagick.rb in the lib directory and then edit lib/gruff/base.rb to require CocoaMagick instead of RMagick. Then go up to the top-level gruff directory and run the tests.

For example, to generate the line graph examples, run this: 
% ruby test/line_test.rb

If you need RubyCocoa, you can find directions for installing it here.

3.3 Got comments?

I’m sure there’s a lot that could be said and done to improve this. If you’d like to comment, please email me or post your thoughts on my nascent blog. Thanks!

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Comments (2) post
  1. pig_farmer@earthlink.net Mon Sep 25 14:59:15 +0000 2006

    I’m new to ruby and rubycocoa and appreciate your tutorials. After installing gruff and CocoaMagick, I tried to run your first test example but it can’t find ‘height’ in the Type_Metrics class. Am I doing something wrong?

    ruby test/line_test.rb fails because type_metrics doesn’t have a height attribute:

    Started ...E.E.EEEEEEEE.EEEE.EEEEEE.EEE Finished in 2.694138 seconds. test_all_negative(TestGruffLine): NoMethodError: undefined method `height’ for # ./test/../lib/gruff/base.rb:875:in `calculate_caps_height’ ./test/../lib/gruff/base.rb:434:in `setup_graph_measurements’ ./test/../lib/gruff/base.rb:397:in `setup_drawing’ ./test/../lib/gruff/base.rb:376:in `draw’ ./test/../lib/gruff/line.rb:37:in `draw’ ./test/../lib/gruff/base.rb:357:in `write’ test/line_test.rb:346:in `test_all_negative’

    1) Error:

    (many more errors with same error.

    base.rb lines 873 to 876 def calculate_caps_height(font_size) @d.pointsize = font_size @d.get_type_metrics(@base_image, ‘X’).height end

    CocoaMagick Type_Metrics class: class TypeMetric attr_accessor :width def initialize @width = 50 end end NormalWeight = 400 BoldWeight = 700 WestGravity = :west EastGravity = :east CenterGravity = :center SouthGravity = :south NorthGravity = :north SouthWestGravity = :southwest NorthWestGravity = :northwest NorthEastGravity = :northeast SouthEastGravity = :southeast end

  2. Tim Mon Sep 25 16:20:12 +0000 2006

    Sorry, it looks like gruff has gotten ahead of us.  Perhaps you can fix this by adding a height method to CocoaMagic?  I’ll look into this soon.