Class Gruff::Area
In: lib/gruff/area.rb
Parent: Gruff::Base

Methods

draw  

Public Instance methods

[Source]

# File lib/gruff/area.rb, line 6
  def draw
    super

    return unless @has_data

    @x_increment = @graph_width / (@column_count - 1).to_f
    @d = @d.stroke 'transparent'

    @norm_data.each do |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 do |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)

        if prev_x > 0 and prev_y > 0 then
          poly_points << new_x
          poly_points << new_y
          
          #@d = @d.polyline(prev_x, prev_y, new_x, new_y)
        else
          poly_points << @graph_left
          poly_points << @graph_bottom - 1
          poly_points << new_x
          poly_points << new_y
          
          #@d = @d.polyline(@graph_left, @graph_bottom, new_x, new_y)
        end

        draw_label(new_x, index)

        prev_x = new_x
        prev_y = new_y
      end

      # 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)

    end

    @d.draw(@base_image)
  end

[Validate]