Class: Gruff::PhotoBar

Inherits:
Base
  • Object
show all
Defined in:
lib/gruff/photo_bar.rb

Overview

EXPERIMENTAL!

Doesn’t work yet.

Constant Summary

Constants inherited from Base

Base::DATA_COLOR_INDEX, Base::DATA_LABEL_INDEX, Base::DATA_VALUES_INDEX, Base::DEBUG, Base::DEFAULT_TARGET_WIDTH, Base::LEGEND_MARGIN

Instance Attribute Summary collapse

Attributes inherited from Base

#additional_line_values, #bottom_margin, #center_labels_over_point, #colors, #font, #font_color, #has_left_labels, #hide_legend, #hide_line_markers, #hide_line_numbers, #hide_title, #labels, #left_margin, #legend_box_size, #legend_font_size, #marker_color, #marker_count, #marker_font_size, #maximum_value, #minimum_value, #no_data_message, #right_margin, #sort, #stacked, #title, #title_font_size, #top_margin, #x_axis_label, #y_axis_increment, #y_axis_label

Instance Method Summary collapse

Methods inherited from Base

#add_color, #data, #initialize, #initialize_ivars, #margins=, #replace_colors, #theme=, #theme_37signals, #theme_greyscale, #theme_keynote, #theme_odeo, #theme_pastel, #theme_rails_keynote, #to_blob, #write

Methods included from Deprecated

#graph_height, #graph_left, #graph_top, #graph_width, #scale_measurements, #total_height

Constructor Details

This class inherits a constructor from Gruff::Base

Instance Attribute Details

#theme ⇒ Object (readonly)

Return the chosen theme or the default



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# File 'lib/gruff/photo_bar.rb', line 19

def theme
  @theme
end

Instance Method Details

#draw ⇒ Object

def initialize(target_width=800)

  super
  init_photo_bar_graphics()
end



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# 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