Class: CA::Gnuplot::ColorPalette

Inherits:
Object
  • Object
show all
Defined in:
lib/carray/graphics/gnuplot.rb,
lib/carray/graphics/gnuplot.rb

Overview

:nodoc:

Direct Known Subclasses

ColorPalette

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model, levels, color, scale = nil, continuous = false) ⇒ ColorPalette

Returns a new instance of ColorPalette.



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# File 'lib/carray/graphics/gnuplot.rb', line 1870

def initialize (model, levels, color, scale = nil, continuous = false)
  @model  = model
  @levels = levels
  @color  = color
  @scale  = scale || CArray.int(levels).seq!
  @continuous = continuous
end

Instance Attribute Details

#colors ⇒ Object (readonly)

Returns the value of attribute colors.



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# File 'lib/carray/graphics/gnuplot.rb', line 1878

def colors
  @colors
end

#scale ⇒ Object (readonly)

Returns the value of attribute scale.



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# File 'lib/carray/graphics/gnuplot.rb', line 1878

def scale
  @scale
end

Class Method Details

.CPT(file, opt = nil) ⇒ Object 



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# File 'lib/carray/graphics/gnuplot.rb', line 1918

def self.CPT (file, opt = nil)
  options = {:continuous => false}.update(opt)
  continuous = options[:continuous]
  if File.exist?(file)
    text = File.read(file)
  else
    if continuous
      text = IO.popen("makecpt -C#{file} -Z", "r") { |io| io.read }
    else
      text = IO.popen("makecpt -C#{file}", "r") { |io| io.read }        
    end 
    if text =~ /\A\s*\Z/
      raise "failed to makecpt #{file}"
    end
  end

  lines = text.split("\n").map{|line| line.strip }
  
  model   = "HSV"
  entries = []
  lines.each do |line|
    case line
    when /\A\#\s*COLOR_MODEL\s*=\s*(.+)\s*\Z/
      model = $1.upcase
    when /\A\Z/, /\A#/, /\A([FBN])\s*(.*)\Z/
      next
    else
      list = line.split(/\s+/)
      list[1] = list[1].split(/\-/)
      list[3] = list[3].split(/\-/)
      list = list.flatten.map{|x| x.to_f}
      entries.push(list)
    end
  end

  levels = entries.size * 2
  color  = CArray.float(levels, 3)
  scale  = CArray.float(levels)
  level = 0
  entries.each do |entry|
    scale[level] = entry[0]
    color[level, nil] = entry[1, 3]
    level += 1
    scale[level] = entry[4]
    color[level, nil] = entry[5, 3]
    level += 1
  end
  if model =~ /HSV/
    color[nil, 0] /= 360
  else
    color[] /= 255
  end

  return ColorPalette.new(model, levels, color, scale, options[:contiuous])
end

.GMT(file, continuous = true) ⇒ Object 



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# File 'lib/carray/graphics/gnuplot.rb', line 1974

def self.GMT (file, continuous = true)    
  return CPT(file, :continuous=>continuous)
end

Instance Method Details

#max ⇒ Object 



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# File 'lib/carray/graphics/gnuplot.rb', line 1884

def max
  return @scale.max
end

#min ⇒ Object 



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# File 'lib/carray/graphics/gnuplot.rb', line 1880

def min
  return @scale.min
end

#range ⇒ Object 



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# File 'lib/carray/graphics/gnuplot.rb', line 1888

def range
  return @scale.min..@scale.max
end

#to_gnuplot ⇒ Object 



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# File 'lib/carray/graphics/gnuplot.rb', line 1892

def to_gnuplot
  out = []
  maxcolors = 1024
  if @continuous
    (@levels).times do |i|
      level = @scale[i]
      out.push([level, *@color[i,nil].to_a])
    end
  else
    (@levels-1).times do |i|
      level  = @scale[i]
      level1 = @scale[i+1]
      out.push([level, *@color[i,nil].to_a])
      out.push([level1, *@color[i,nil].to_a])
    end
    maxcolors = @levels-1
  end
  return ["set palette model #{@model} maxcolors #{maxcolors} defined (\\",
    out.map{|list| "  " + list.join(" ")}.join(",\\\n") + "\\",
    ")"].join("\n")
end