Class: Dragonfly::Generation::ImageMagickGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/dragonfly/generation/image_magick_generator.rb

Constant Summary collapse

FONT_STYLES = 
{
  'normal'  => 'normal',
  'italic'  => 'italic',
  'oblique' => 'oblique'
}
FONT_STRETCHES = 
{
  'normal'          => 'normal',
  'semi-condensed'  => 'semi-condensed',
  'condensed'       => 'condensed',
  'extra-condensed' => 'extra-condensed',
  'ultra-condensed' => 'ultra-condensed',
  'semi-expanded'   => 'semi-expanded',
  'expanded'        => 'expanded',
  'extra-expanded'  => 'extra-expanded',
  'ultra-expanded'  => 'ultra-expanded'
}
FONT_WEIGHTS = 
{
  'normal'  => 'normal',
  'bold'    => 'bold',
  'bolder'  => 'bolder',
  'lighter' => 'lighter',
  '100'     => 100,
  '200'     => 200,
  '300'     => 300,
  '400'     => 400,
  '500'     => 500,
  '600'     => 600,
  '700'     => 700,
  '800'     => 800,
  '900'     => 900
}

Instance Method Summary collapse

Instance Method Details

#plasma(width, height, format = 'png') ⇒ Object 



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# File 'lib/dragonfly/generation/image_magick_generator.rb', line 42

def plasma(width, height, format='png')
  tempfile = new_tempfile(format)
  run "#{convert_command} -size #{width}x#{height} plasma:fractal #{tempfile.path}"
  [
    tempfile,
    {:format => format.to_sym, :name => "plasma.#{format}"}
  ]
end

#text(string, opts = {}) ⇒ Object 



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# File 'lib/dragonfly/generation/image_magick_generator.rb', line 51

def text(string, opts={})
  opts = HashWithCssStyleKeys[opts]
  args = []
  format = (opts[:format] || :png)
  background = opts[:background_color] || 'none'
  font_size = (opts[:font_size] || 12).to_i
  escaped_string = "\"#{string.gsub(/"/, '\"')}\""

  # Settings
  args.push("-gravity NorthWest")
  args.push("-antialias")
  args.push("-pointsize #{font_size}")
  args.push("-font '#{opts[:font]}'") if opts[:font]
  args.push("-family '#{opts[:font_family]}'") if opts[:font_family]
  args.push("-fill #{opts[:color]}") if opts[:color]
  args.push("-stroke #{opts[:stroke_color]}") if opts[:stroke_color]
  args.push("-style #{FONT_STYLES[opts[:font_style]]}") if opts[:font_style]
  args.push("-stretch #{FONT_STRETCHES[opts[:font_stretch]]}") if opts[:font_stretch]
  args.push("-weight #{FONT_WEIGHTS[opts[:font_weight]]}") if opts[:font_weight]
  args.push("-background #{background}")
  args.push("label:#{escaped_string}")

  # Padding
  pt, pr, pb, pl = parse_padding_string(opts[:padding]) if opts[:padding]
  padding_top    = (opts[:padding_top]    || pt || 0)
  padding_right  = (opts[:padding_right]  || pr || 0)
  padding_bottom = (opts[:padding_bottom] || pb || 0)
  padding_left   = (opts[:padding_left]   || pl || 0)

  tempfile = new_tempfile(format)
  run "#{convert_command} #{args.join(' ')} #{tempfile.path}"

  if (padding_top || padding_right || padding_bottom || padding_left)
    attrs  = identify(tempfile)
    text_width  = attrs[:width].to_i
    text_height = attrs[:height].to_i
    width  = padding_left + text_width  + padding_right
    height = padding_top  + text_height + padding_bottom

    args = args.slice(0, args.length - 2)
    args.push("-size #{width}x#{height}")
    args.push("xc:#{background}")
    args.push("-annotate 0x0+#{padding_left}+#{padding_top} #{escaped_string}")
    run "#{convert_command} #{args.join(' ')} #{tempfile.path}"
  end

  [
    tempfile,
    {:format => format, :name => "text.#{format}"}
  ]
end