Class: Mooncats::Image

Inherits:
Pixelart::Image
  • Object
show all
Defined in:
lib/mooncats/image.rb,
lib/mooncats/composite.rb

Defined Under Namespace

Classes: Composite

Constant Summary collapse

COLORS_GENESIS_WHITE = 
['#555555', '#d3d3d3', '#ffffff', '#aaaaaa', '#ff9999']
COLORS_GENESIS_BLACK = 
['#555555', '#222222', '#111111', '#bbbbbb', '#ff9999']

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(initial = nil, design: nil, colors: nil) ⇒ Image

Returns a new instance of Image.



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# File 'lib/mooncats/image.rb', line 48

def initialize( initial=nil, design: nil,
                             colors: nil )
    if initial
      ## pass image through as-is
      img = inital
    else
      design ||= 0
      colors ||= COLORS_GENESIS_WHITE

      design =  if design.is_a?( String )
                  Design.parse( design )
                elsif design.is_a?( Array )
                   Design.new( design )
                elsif design.is_a?( Design )
                   design  ## pass through as is 1:1
                else  ## assume integer nuber
                   design_num = design  ## note: for convenience "porcelain" param is named design (NOT design_num)
                   Design.find( design_num )
                end

      ## note: first color (index 0) is always nil (default/white or transparent)
      colors = [ nil ] + colors.map { |color| Pixelart::Color.parse( color ) }

      ## puts " colors:"
      ## pp colors

      img = ChunkyPNG::Image.new( design.width,
                                  design.height,
                                  ChunkyPNG::Color::TRANSPARENT ) # why? why not?

      design.each_with_index do |row, y|
        row.each_with_index do |color, x|
          if color > 0
            pixel = colors[ color ]

            ## note: special built-in color palette black & white "hack"
            ##         only active if colors 6 & 7 NOT defined
            ##    color 6 => black (000000 / ff) rgb / a(lpha)
            ##    color 7 => white (ffffff / ff) rgb / a(lpha)
            pixel = 0xff       if pixel.nil? && color == 6
            pixel = 0xffffffff if pixel.nil? && color == 7

            img[x,y] = pixel
          end # has color?
        end # each row
      end # each data
    end

    super( img.width, img.height, img )
end

Class Method Details

.derive_palette(r: nil, g: nil, b: nil, hue: nil, invert: false) ⇒ Object

(static) helpers



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# File 'lib/mooncats/image.rb', line 103

def self.derive_palette( r: nil, g: nil, b: nil,
                         hue: nil,
                         invert: false )

   if hue
     ## pass through as is 1:1
   else ## assume r, g, b
      ## note: Color.rgb returns an Integer (e.g. 34113279 - true color or just hex rgba or?)
      rgb = ChunkyPNG::Color.rgb( r, g, b )

      # to_hsl(color, include_alpha = false) ⇒ Array<Fixnum>[0], ...
       #   Returns an array with the separate HSL components of a color.
      hsl = ChunkyPNG::Color.to_hsl( rgb )
      #=> [237, 0.9705882352941178, 0.26666666666666666]

      # h = hsl[0]
      # s = hsl[1]
      # l = hsl[2]

      hue = hsl[0]
   end

   hx = hue % 360      ## note: makes sure number is always POSITIVE (e.g. -13 % 360 => 347)
   hy = (hue + 320) % 360
  #=> e.g. hx: 237, hy: 197

  c1 = ChunkyPNG::Color.from_hsl( hx, 1, 0.1 )
  if invert
    c4 = ChunkyPNG::Color.from_hsl( hx, 1, 0.2 )
    c5 = ChunkyPNG::Color.from_hsl( hx, 1, 0.45 )
    c2 = ChunkyPNG::Color.from_hsl( hx, 1, 0.7 )
    c3 = ChunkyPNG::Color.from_hsl( hy, 1, 0.8 )
  else
    c2 = ChunkyPNG::Color.from_hsl( hx, 1, 0.2 )
    c3 = ChunkyPNG::Color.from_hsl( hx, 1, 0.45 )
    c4 = ChunkyPNG::Color.from_hsl( hx, 1, 0.7 )
    c5 = ChunkyPNG::Color.from_hsl( hy, 1, 0.8 )
  end

  ## note: returns an array of Integers!!
  ## e.g. [144127, 354047, 779775, 1701707775, 2581790719]
  [c1, c2, c3, c4, c5]
end

.generate(id) ⇒ Object Also known as: mint 



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# File 'lib/mooncats/image.rb', line 12

def self.generate( id )
  meta = Metadata.new( id )

  design = meta.design.to_i   # note: meta.design is a struct/object - keep/use a local int !!!

  colors = if meta.genesis?
              if design % 2 == 0 && meta.invert? ||
                 design % 2 == 1 && !meta.invert?
                 COLORS_GENESIS_WHITE
              else
                 COLORS_GENESIS_BLACK
              end
           else
             derive_palette( r: meta.r,
                             g: meta.g,
                             b: meta.b,
                             invert: meta.invert? )
           end

  new( design: design,
       colors: colors )
end

.read(path) ⇒ Object

convenience helper



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# File 'lib/mooncats/image.rb', line 41

def self.read( path )   ## convenience helper
  img = ChunkyPNG::Image.from_file( path )
  new( img )
end