Class: Numo::Gnuplot::ImageData

Inherits:
PlotData
  • Object
show all
Defined in:
lib/numo/gnuplot.rb

Direct Known Subclasses

RgbAlphaData, RgbImageData

Instance Method Summary collapse

Methods inherited from PlotData

array_shape, #data_format, #line_str

Constructor Details

#initialize(data) ⇒ ImageData

Returns a new instance of ImageData.



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# File 'lib/numo/gnuplot.rb', line 941

def initialize(data)
  @text = false
  if data.respond_to?(:shape)
    @data = data
    check_shape
    if defined? Numo::NArray
      @format =
        case @data
        when Numo::DFloat; "%float64"
        when Numo::SFloat; "%float32"
        when Numo::Int8;   "%int8"
        when Numo::UInt8;  "%uint8"
        when Numo::Int16;  "%int16"
        when Numo::UInt16; "%uint16"
        when Numo::Int32;  "%int32"
        when Numo::UInt32; "%uint32"
        when Numo::Int64;  "%int64"
        when Numo::UInt64; "%uint64"
        else
          raise ArgumentError,"not supported NArray type"
        end
    end
  elsif data.kind_of? Array
    n = nil
    @data = []
    data.each do |a|
      @data.concat(a)
      m = a.size
      if n && n != m
        raise IndexError,"element size differs (%d should be %d)"%[m, n]
      end
      n = m
    end
    @shape = [data.size,n]
    @format = "%float64"
  else
    raise ArgumentError,"argument should be data array"
  end
end

Instance Method Details

#check_shape ⇒ Object

:nodoc: all



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# File 'lib/numo/gnuplot.rb', line 934

def check_shape
  if @data.shape.size != 2
    raise IndexError,"array should be 2-dimensional"
  end
  @shape = @data.shape
end

#cmd_str ⇒ Object 



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# File 'lib/numo/gnuplot.rb', line 981

def cmd_str
  if @text
    "'-' matrix"
  else
    "'-' binary array=(#{@shape[1]},#{@shape[0]}) format='#{@format}'"
  end
end

#data_str ⇒ Object 



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# File 'lib/numo/gnuplot.rb', line 989

def data_str
  if @text
    f = data_format
    s = ""
    @data.to_a.each do |b|
      s << b.map{|e| f%e}.join(" ")+"\n"
    end
    s+"\ne"
  elsif defined? Numo::NArray
    if @data.kind_of?(Numo::NArray)
      @data.to_string
    else
      Numo::DFloat.cast(@data).to_string
    end
  else
    @data.pack("d*")
  end
end