environment.rb

require 'polaroid.rb'

error

=> Booting Mongrel (use 'script/server webrick' to force WEBrick)
=> Rails 2.1.0 application starting on http://0.0.0.0:3000
=> Debugger enabled
=> Call with -d to detach
=> Ctrl-C to shutdown server
** Starting Mongrel listening at 0.0.0.0:3000
** Starting Rails with development environment...
Exiting
/Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:278:in `load_missing_constant': uninitialized constant Fleximage (NameError)
        from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:467:in `const_missing'
        from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:479:in `const_missing'
        from /Users/patrick/coding/rails/matthew/lib/polaroid.rb:1
        from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
        from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'
        from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:509:in `require'
        from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:354:in `new_constants_in'
        from /Library/Ruby/Gems/1.8/gems/activesupport-2.1.0/lib/active_support/dependencies.rb:509:in `require'
         ... 31 levels...
        from /Library/Ruby/Gems/1.8/gems/rails-2.1.0/lib/commands/server.rb:39
        from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
        from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'
        from ./script/server:3

polaroid.rb

class Fleximage::Operator::Polaroid < Fleximage::Operator::Base
  def operate(angle)
    @image.border!(18, 18, "#f0f0ff")

    # Bend the image
    @image.background_color = "none" 

    amplitude = @image.columns * 0.01        # vary according to taste
    wavelength = @image.rows  * 2

    @image.rotate!(90)
    @image = @image.wave(amplitude, wavelength)
    @image.rotate!(-90)

    # Make the shadow
    shadow = @image.flop
    shadow = shadow.colorize(1, 1, 1, "gray75")     # shadow color can vary to taste
    shadow.background_color = "white"       # was "none" 
    shadow.border!(10, 10, "white")
    shadow = shadow.blur_image(0, 3)        # shadow blurriness can vary according to taste

    # Composite image over shadow. The y-axis adjustment can vary according to taste.
    @image = shadow.composite(@image, -amplitude/2, 5, Magick::OverCompositeOp)

    @image.rotate!(angle)                       # vary according to taste
    @image.trim!
  end
end