an class='kw'>def</span> <span class='id identifier rubyid_color='>color=</span><span class='lparen'>(</span><span class='id identifier rubyid_rgba_array'>rgba_array</span><span class='op'>=</span><span class='lbracket'>[</span><span class='rbracket'>]</span><span class='rparen'>)</span>
  <span class='ivar'>@r</span> <span class='op'>=</span> <span class='id identifier rubyid_rgba_array'>rgba_array</span><span class='lbracket'>[</span><span class='int'>0</span><span class='rbracket'>]</span> <span class='k