Module: NMatrixExtensions

Defined in:
lib/nmatrix_extensions.rb

Instance Method Summary collapse

Instance Method Details

#heatmap(options = {}) ⇒ Object 



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# File 'lib/nmatrix_extensions.rb', line 21

def heatmap(options={})
  if $no_rmagick
    return nil
  end

  opts = {:col_header             => 'ACDEFGHIKLMNPQRSTVWYJ'.split(''),
          :row_header             => 'ACDEFGHIKLMNPQRSTVWYJ'.split(''),
          :max_val                => self.max,
          :mid_val                => (self.max - self.min) / 2.0,
          :min_val                => self.min,
          :dpi                    => 100,
          :margin_width           => 30,
          :rvg_width              => nil,
          :rvg_height             => nil,
          :canvas_width           => nil,
          :canvas_height          => nil,
          :cell_width             => 20,
          :cell_height            => 20,
          :cell_border_color      => '#888888',
          :cell_border_width      => 1,
          :table_border_color     => '#000000',
          :table_border_width     => 2,
          :header_height          => 100,
          :footer_height          => 50,
          :print_gradient         => true,
          :gradient_width         => 300,
          :gradient_height        => 30,
          :gradient_beg_color     => '#FFFFFF',
          :gradient_mid_color     => nil,
          :gradient_end_color     => '#FF0000',
          :gradient_border_width  => 1,
          :gradient_border_color  => '#000000',
          :font_scale             => 0.9,
          :font_family            => 'san serif',
          :small_gap_width        => 2,
          :title?                 => true,
          :title                  => '',
          :title_font_size        => 35,
          :title_font_scale       => 1.0,
          :print_value            => false,
          :key_font_size          => 15,
          :value_font_size        => 8,
          :background             => '#FFFFFF'}.merge(options)

  RVG::dpi = opts[:dpi]

  rvg = RVG.new(opts[:rvg_width], opts[:rvg_height]) do |canvas|
    title_x = (opts[:canvas_width] - opts[:title].length * opts[:title_font_size] * opts[:title_font_scale] / 2.0) / 2.0
    title_y = opts[:header_height] - opts[:title_font_size] * opts[:title_font_scale]

    canvas.viewbox(0, 0, opts[:canvas_width], opts[:canvas_height])
    canvas.background_fill = opts[:background]
    canvas.desc = opts[:title]

    if opts[:title?]
      canvas.text(title_x, title_y, opts[:title]).styles(:font_size => opts[:title_font_size] * opts[:title_font_scale])
    end

    # border for whole matrix
    table_x = (opts[:canvas_width] - opts[:cell_width] * self.shape[0]) / 2.0
    table_y = opts[:header_height] + opts[:cell_height]

    canvas.rect(self.shape[0] * opts[:cell_width],
                self.shape[1] * opts[:cell_height],
                table_x,
                table_y).styles(:stroke       => opts[:table_border_color],
                                :stroke_width => opts[:table_border_width])

    # drawing column and row labels
    0.upto(self.shape[0] - 1) do |col|
      canvas.text(table_x + col * opts[:cell_width] + opts[:small_gap_width],
                  opts[:cell_height] + opts[:header_height] - opts[:small_gap_width],
                  opts[:col_header][col]).styles( :font_family  => opts[:font_family],
                                                  :font_size    => opts[:cell_width] * opts[:font_scale])
    end

    0.upto(self.shape[1] - 1) do |row|
      canvas.text(table_x - opts[:cell_width],
                  table_y + (row + 1) * opts[:cell_height],
                  opts[:row_header][row]).styles( :font_family  => opts[:font_family],
                                                  :font_size    => opts[:cell_height] * opts[:font_scale])
    end

    # drawing cells

    # calculating a unit of RGB color in a decimal number
    r_beg = (opts[:gradient_beg_color].rgb_to_integer & 0xFF0000) >> 16
    g_beg = (opts[:gradient_beg_color].rgb_to_integer & 0x00FF00) >> 8
    b_beg = (opts[:gradient_beg_color].rgb_to_integer & 0x0000FF) >> 0
    r_end = (opts[:gradient_end_color].rgb_to_integer & 0xFF0000) >> 16
    g_end = (opts[:gradient_end_color].rgb_to_integer & 0x00FF00) >> 8
    b_end = (opts[:gradient_end_color].rgb_to_integer & 0x0000FF) >> 0
    gap   = opts[:max_val] - opts[:min_val]

    if opts[:gradient_mid_color]
      r_mid = (opts[:gradient_mid_color].rgb_to_integer & 0xFF0000) >> 16
      g_mid = (opts[:gradient_mid_color].rgb_to_integer & 0x00FF00) >> 8
      b_mid = (opts[:gradient_mid_color].rgb_to_integer & 0x0000FF) >> 0
      gap1  = opts[:mid_val] - opts[:min_val]
      gap2  = opts[:max_val] - opts[:mid_val]
    end

    0.upto(self.shape[0] - 1) do |col|
      0.upto(self.shape[1] - 1) do |row|
        if opts[:gradient_mid_color]
          if self[col, row] <= opts[:mid_val]
            r = interpolate(r_beg, r_mid, self[col, row] - opts[:min_val], gap1)
            g = interpolate(g_beg, g_mid, self[col, row] - opts[:min_val], gap1)
            b = interpolate(b_beg, b_mid, self[col, row] - opts[:min_val], gap1)
          else
            r = interpolate(r_mid, r_end, self[col, row] - opts[:mid_val], gap2)
            g = interpolate(g_mid, g_end, self[col, row] - opts[:mid_val], gap2)
            b = interpolate(b_mid, b_end, self[col, row] - opts[:mid_val], gap2)
          end
        else
          r = interpolate(r_beg, r_end, self[col, row] - opts[:min_val], gap)
          g = interpolate(g_beg, g_end, self[col, row] - opts[:min_val], gap)
          b = interpolate(b_beg, b_end, self[col, row] - opts[:min_val], gap)
        end

        color = ("#%6X" % ((((r << 8) | g) << 8) | b)).gsub(" ", "0")

        canvas.rect(opts[:cell_width],
                    opts[:cell_height],
                    table_x + col * opts[:cell_width],
                    table_y + row * opts[:cell_height]).styles( :fill         => color,
                                                                :stroke       => opts[:cell_border_color],
                                                                :stroke_width => opts[:cell_border_width])

        if opts[:print_value]
          canvas.text(table_x + col * opts[:cell_width] + opts[:cell_border_width],
                      table_y + (row + 1) * opts[:cell_height],
                      "#{'%.1f' % self[col, row]}").styles(:font_size => opts[:value_font_size])
        end
      end
    end

    # gradient key
    if opts[:print_gradient]
      if opts[:gradient_mid_color]
        img1 = Image.new(opts[:gradient_height],
                        opts[:gradient_width] / 2,
                        GradientFill.new(0,
                                          opts[:gradient_width] / 2,
                                          opts[:gradient_height],
                                          opts[:gradient_width] / 2,
                                          opts[:gradient_beg_color],
                                          opts[:gradient_mid_color])).rotate(90)

        img2 = Image.new(opts[:gradient_height],
                        opts[:gradient_width] / 2,
                        GradientFill.new(0,
                                          opts[:gradient_width] / 2,
                                          opts[:gradient_height],
                                          opts[:gradient_width] / 2,
                                          opts[:gradient_mid_color],
                                          opts[:gradient_end_color])).rotate(90)
        img3 = ImageList.new
        img3 << img1 << img2
        img = img3.append(false)
      else
        img = Image.new(opts[:gradient_height],
                        opts[:gradient_width],
                        GradientFill.new(0,
                                        opts[:gradient_width],
                                        opts[:gradient_height],
                                        opts[:gradient_width],
                                        opts[:gradient_beg_color],
                                        opts[:gradient_end_color])).rotate(90)
      end

      img.border!(opts[:gradient_border_width],
                  opts[:gradient_border_width],
                  opts[:gradient_border_color])

      gradient_x = (opts[:canvas_width] - opts[:gradient_width]) / 2
      gradient_y = opts[:header_height] + opts[:cell_height] * opts[:row_header].count + opts[:margin_width]

      canvas.image(img,
                  opts[:gradient_width],
                  opts[:gradient_height] + opts[:margin_width],
                  gradient_x,
                  gradient_y)

      canvas.text(gradient_x,
                  gradient_y + opts[:gradient_height] + opts[:key_font_size] * 2,
                  "#{'%.1f' % opts[:min_val]}").styles(:font_size => opts[:key_font_size])

      canvas.text(gradient_x + opts[:gradient_width],
                  gradient_y + opts[:gradient_height] + opts[:key_font_size] * 2,
                  "#{'%.1f' % opts[:max_val]}").styles(:font_size => opts[:key_font_size])
    end
  end

  rvg.draw
end

#pretty_string(options = {}) ⇒ Object 



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# File 'lib/nmatrix_extensions.rb', line 3

def pretty_string(options={})
  opts = {:col_header => nil,
          :row_header => nil,
          :col_size   => 7}.merge(options)

  ("%-3s" % "#") + opts[:col_header].inject("") { |s, a|
    s + ("%#{opts[:col_size]}s" % a)
  } + "\n" + self.to_a.each_with_index.map { |a, i|
    ("%-3s" % opts[:row_header][i]) + a.inject("") { |s, v|
      if v.is_a? Float
        s + ("%#{opts[:col_size]}.2f" % v)
      else
        s + ("%#{opts[:col_size]}d" % v)
      end
    }
  }.join("\n")
end