Method: Pixelart::ImageComposite#initialize

Defined in:
lib/pixelart/composite.rb

#initialize(*args, **kwargs) ⇒ ImageComposite

Returns a new instance of ImageComposite.



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# File 'lib/pixelart/composite.rb', line 17

def initialize( *args, **kwargs )
  @tile_width  = kwargs[:width]  || kwargs[:tile_width]  || TILE_WIDTH
  @tile_height = kwargs[:height] || kwargs[:tile_height] || TILE_HEIGHT

  ## check for background
  background = kwargs[:background] || kwargs[:tile_background]

  if background
    ## wrap into an array if not already an array
    ##  and convert all colors to true rgba colors as integer numbers
    background = [background]   unless background.is_a?( Array )
    @background_colors = background.map { |color| Color.parse( color ) }
  else
    ## todo/check: use empty array instead of nil - why? why not?
    @background_colors = nil
  end


  ## todo/fix: check type - args[0] is Image!!!
  if args.size == 1   ## assume "copy" c'tor with passed in image
     img = args[0]    ## pass image through as-is

     @tile_cols  = img.width  / @tile_width       ## e.g. 2400/24 = 100
     @tile_rows  = img.height / @tile_height      ## e.g. 2400/24 = 100
     @tile_count = @tile_cols * @tile_rows       ## ## 10000 = 100x100  (2400x2400 pixel)
  elsif args.size == 2 || args.size == 0     ## cols, rows
    ## todo/fix: check type - args[0] & args[1] is Integer!!!!!
     ## todo/check - find a better name for cols/rows - why? why not?
     @tile_cols = args[0] || 3
     @tile_rows = args[1] || 3
     @tile_count = 0   # (track) current index (of added images)

     background_color = if @background_colors && @background_colors.size == 1
                           @background_colors[0]
                        else
                           0  # note: 0 is transparent (0) true color
                        end

      ## todo/check - always auto-fill complete image (even if empty/no tiles)
      ##                with background color if only one background color
      ##                   why? why not??? or always follow the "model"
      ##                                       with more than one background color???
      img = ChunkyPNG::Image.new( @tile_cols * @tile_width,
                                  @tile_rows * @tile_height,
                                  background_color )

  else
     raise ArgumentError, "cols, rows or image arguments expected; got: #{args.inspect}"
  end


  puts "     #{img.height}x#{img.width} (height x width)"

  super( nil, nil, img )
end