Class: Blueprint::GridBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/template/css/blueprint/lib/blueprint/grid_builder.rb

Overview

Uses ImageMagick and RMagick to generate grid.png file

Instance Attribute Summary collapse

Instance Method Summary collapse

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/template/css/blueprint/lib/blueprint/grid_builder.rb', line 30

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

Instance Attribute Details

#able_to_generate ⇒ Object (readonly)

Returns the value of attribute able_to_generate.



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# File 'lib/template/css/blueprint/lib/blueprint/grid_builder.rb', line 23

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/template/css/blueprint/lib/blueprint/grid_builder.rb', line 23

def column_width
  @column_width
end

#gutter_width ⇒ Object (readonly)

Returns the value of attribute gutter_width.



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# File 'lib/template/css/blueprint/lib/blueprint/grid_builder.rb', line 23

def gutter_width
  @gutter_width
end

#output_path ⇒ Object (readonly)

Returns the value of attribute output_path.



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# File 'lib/template/css/blueprint/lib/blueprint/grid_builder.rb', line 23

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/template/css/blueprint/lib/blueprint/grid_builder.rb', line 39

def generate!
  return false unless self.able_to_generate
  total_width = self.column_width + self.gutter_width
  height = 18
  RVG::dpi = 100

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

    canvas.g do |column|
      column.rect(self.column_width - 1, height).styles(:fill => "#e8effb")
    end

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

  FileUtils.mkdir self.output_path unless File.exists? self.output_path
  rvg.draw.write(File.join(self.output_path, "grid.png"))
end