Class: Compass::GridBuilder

Inherits:
Object
  • Object
show all
Includes:
Actions
Defined in:
lib/compass/grid_builder.rb

Overview

Uses ImageMagick and RMagick to generate grid.png file

Instance Attribute Summary collapse

Attributes included from Actions

#logger

Instance Method Summary collapse

Methods included from Actions

#basename, #compile, #copy, #directory, #relativize, #separate, #strip_trailing_separator, #write_file

Constructor Details

#initialize(options = {}) ⇒ GridBuilder

Options

  • options

    • :column_width – Width (in pixels) of current grid column

    • :gutter_width – Width (in pixels) of current grid gutter

    • :output_path – Output path of grid.png file



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# File 'lib/compass/grid_builder.rb', line 26

def initialize(options={})
  @able_to_generate = Magick::Long_version rescue false
  return unless @able_to_generate
  @column_width = options[:column_width]
  @gutter_width = options[:gutter_width]
  @output_path  = options[:output_path]
  @options = options
end

Instance Attribute Details

#able_to_generate ⇒ Object (readonly)

Returns the value of attribute able_to_generate.



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# File 'lib/compass/grid_builder.rb', line 19

def able_to_generate
  @able_to_generate
end

#column_width ⇒ Object (readonly)

Returns the value of attribute column_width.



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# File 'lib/compass/grid_builder.rb', line 19

def column_width
  @column_width
end

#gutter_width ⇒ Object (readonly)

Returns the value of attribute gutter_width.



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# File 'lib/compass/grid_builder.rb', line 19

def gutter_width
  @gutter_width
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/compass/grid_builder.rb', line 19

def options
  @options
end

#output_path ⇒ Object (readonly)

Returns the value of attribute output_path.



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# File 'lib/compass/grid_builder.rb', line 19

def output_path
  @output_path
end

Instance Method Details

#generate! ⇒ Object

generates (overwriting if necessary) grid.png image to be tiled in background



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# File 'lib/compass/grid_builder.rb', line 40

def generate!
  return false unless self.able_to_generate
  total_width = self.column_width + self.gutter_width
  height = 20
  RVG::dpi = 100

  rvg = RVG.new((total_width.to_f/RVG::dpi).in, (height.to_f/RVG::dpi).in).viewbox(0, 0, total_width, height) do |canvas|
    canvas.background_fill = 'white'

    canvas.g do |column|
      column.rect(self.column_width, height).styles(:fill => "#e8effb")
    end

    canvas.g do |baseline|
      baseline.line(0, (height - 1), total_width, (height- 1)).styles(:fill => "#e9e9e9")
    end
  end

  filename = File.join(self.output_path, "grid.png")
  if File.exists?(filename)
    if options[:force]
      overwrite = true
    else
      msg = "#{filename} already exists. Overwrite with --force."
      raise Compass::FilesystemConflict.new(msg)
    end
  end
  directory self.output_path
  logger.record((overwrite ? :overwrite : :create), basename(filename))
  rvg.draw.write(filename)
end

#working_path ⇒ Object 



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# File 'lib/compass/grid_builder.rb', line 35

def working_path
  options[:working_path]
end