class ImageParadise::Gruff::Area

Public Class Methods

new(*) click to toggle source
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initialize

#
Calls superclass method ImageParadise::Gruff::Base::new
# File lib/image_paradise/graphs/area.rb, line 17
def initialize(*)
  super
  reset
end

Public Instance Methods

draw() click to toggle source
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draw

#
Calls superclass method ImageParadise::Gruff::Base#draw
# File lib/image_paradise/graphs/area.rb, line 32
def draw
  super
  return unless @has_data
  @x_increment = @graph_width / (@column_count - 1).to_f
  @d = @d.stroke('transparent')

  @norm_data.each { |data_row|
    poly_points = Array.new
    _prev_x = prev_y = 0.0
    @d = @d.fill data_row[DATA_COLOR_INDEX]
    data_row[DATA_VALUES_INDEX].each_with_index { |data_point, index|
      # Use incremented x and scaled y
      new_x = @graph_left + (@x_increment * index)
      new_y = @graph_top + (@graph_height - data_point * @graph_height)
      poly_points << new_x
      poly_points << new_y
      draw_label(new_x, index)
      _prev_x = new_x
      _prev_y = new_y
    }
    # ===================================================================== #
    # Add closing points, draw polygon
    # ===================================================================== #
    poly_points << @graph_right
    poly_points << @graph_bottom - 1
    poly_points << @graph_left
    poly_points << @graph_bottom - 1
    @d = @d.polyline(*poly_points)
  }
  @d.draw(@base_image)
end
reset() click to toggle source
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reset

#
# File lib/image_paradise/graphs/area.rb, line 25
def reset
  @sorted_drawing = true
end