Class: DynamicSprites::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/dynamic-sprites/generator.rb

Overview

Generates sprites

Constant Summary collapse

VALID_EXTENSIONS =

Array of file extensions used for creating sprites.

%w(.png .jpg .jpeg .gif .ico)

Instance Method Summary collapse

Constructor Details

#initialize(filename, path, layout) ⇒ Generator

Initializer

filename - Pathname where generated file should be placed to. path - Pathname of directory containing source images. layout - sprite layout name as a String



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# File 'lib/dynamic-sprites/generator.rb', line 16

def initialize(filename, path, layout)
  @filename = filename
  @layout = layout
  @files = Dir.glob(File.join(path, '*')).sort.select { |e| VALID_EXTENSIONS.include?(File.extname(e)) }
  @images = load(@files)
  @canvas = canvas
end

Instance Method Details

#mixin_call ⇒ Object

Returns a call to sass mixin function with default attributes



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# File 'lib/dynamic-sprites/generator.rb', line 43

def mixin_call
  call = "dynamic-sprite"
  call << "-horizontal" if @layout == "horizontal"
  arguments = [
    @filename,
    @files.map{ |f| File.basename(f) },
    "#{100 / (@files.size - 1)}%",
    "100%",
    "#{100 * @images.first[:height] / @images.first[:width]}%"
  ]
  call << "(#{arguments.join(', ')})"
end

#run! ⇒ Object

Main method for sprites generation



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# File 'lib/dynamic-sprites/generator.rb', line 26

def run!
  @canvas.opacity = Magick::MaxRGB
  offset_x = 0
  offset_y = 0
  @images.each do |image|
    @canvas.composite!(image[:image], offset_x, offset_y, Magick::SrcOverCompositeOp)
    if @layout == 'horizontal'
      offset_x += image[:width]
    else
      offset_y += image[:height]
    end
  end
  @canvas.write(@filename)
end