Class Gruff::PhotoBar
In: lib/gruff/photo_bar.rb
Parent: Gruff::Base

EXPERIMENTAL!

Doesn‘t work yet.

Methods

Attributes

theme  [R]  The name of a pre-packaged photo-based theme.

Public Instance methods

def initialize(target_width=800)

  super
  init_photo_bar_graphics()

end

[Source]

# File lib/gruff/photo_bar.rb, line 26
  def draw
    super
    return unless @has_data

    return # TODO Remove for further development

    init_photo_bar_graphics()
    
    #Draw#define_clip_path()
    #Draw#clip_path(pathname)
    #Draw#composite....with bar graph image OverCompositeOp
    #
    # See also
    #
    # Draw.pattern # define an image to tile as the filling of a draw object
    # 

    # Setup spacing.
    #
    # Columns sit side-by-side.
    spacing_factor = 0.9
    @bar_width = @norm_data[0][DATA_COLOR_INDEX].columns

    @norm_data.each_with_index do |data_row, row_index|
  
      data_row[DATA_VALUES_INDEX].each_with_index do |data_point, point_index|
        data_point = 0 if data_point.nil?
        # Use incremented x and scaled y
        left_x = @graph_left + (@bar_width * (row_index + point_index + ((@data.length - 1) * point_index)))
        left_y = @graph_top + (@graph_height - data_point * @graph_height) + 1
        right_x = left_x + @bar_width * spacing_factor
        right_y = @graph_top + @graph_height - 1
      
        bar_image_width = data_row[DATA_COLOR_INDEX].columns
        bar_image_height = right_y.to_f - left_y.to_f
      
        # Crop to scale for data
        bar_image = data_row[DATA_COLOR_INDEX].crop(0, 0, bar_image_width, bar_image_height)
        
        @d.gravity = NorthWestGravity
        @d = @d.composite(left_x, left_y, bar_image_width, bar_image_height, bar_image)
      
        # Calculate center based on bar_width and current row
        label_center = @graph_left + (@data.length * @bar_width * point_index) + (@data.length * @bar_width / 2.0)
        draw_label(label_center, point_index)
      end

    end

    @d.draw(@base_image)    
  end

Return the chosen theme or the default

[Source]

# File lib/gruff/photo_bar.rb, line 80
  def theme
    @theme || 'plastik'
  end

Protected Instance methods

Sets up colors with a list of images that will be used. Images should be 340px tall

[Source]

# File lib/gruff/photo_bar.rb, line 88
  def init_photo_bar_graphics    
    color_list = Array.new
    theme_dir = File.dirname(__FILE__) + '/../../assets/' + theme

    Dir.open(theme_dir).each do |file|
      next unless /\.png$/.match(file)
      color_list << Image.read("#{theme_dir}/#{file}").first
    end
    @colors = color_list
  end

[Validate]