def draw
super
return unless @has_data
@x_increment = (@column_count > 1) ? (@graph_width / (@column_count - 1).to_f) : @graph_width
if (defined?(@norm_baseline)) then
level = @graph_top + (@graph_height - @norm_baseline * @graph_height)
@d = @d.push
@d.stroke_color @baseline_color
@d.fill_opacity 0.0
@d.stroke_dasharray(10, 20)
@d.stroke_width 5
@d.line(@graph_left, level, @graph_left + @graph_width, level)
@d = @d.pop
end
@norm_data.each do |data_row|
prev_x = prev_y = nil
@one_point = contains_one_point_only?(data_row)
data_row[DATA_VALUES_INDEX].each_with_index do |data_point, index|
new_x = @graph_left + (@x_increment * index)
next if data_point.nil?
draw_label(new_x, index)
new_y = @graph_top + (@graph_height - data_point * @graph_height)
@d = @d.stroke data_row[DATA_COLOR_INDEX]
@d = @d.fill data_row[DATA_COLOR_INDEX]
@d = @d.stroke_opacity 1.0
@d = @d.stroke_width line_width ||
clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 4), 5.0)
circle_radius = dot_radius ||
clip_value_if_greater_than(@columns / (@norm_data.first[DATA_VALUES_INDEX].size * 2.5), 5.0)
if !@hide_lines and !prev_x.nil? and !prev_y.nil? then
@d = @d.line(prev_x, prev_y, new_x, new_y)
elsif @one_point
@d = @d.circle(new_x, new_y, new_x - circle_radius, new_y)
end
@d = @d.circle(new_x, new_y, new_x - circle_radius, new_y) unless @hide_dots
prev_x = new_x
prev_y = new_y
end
end
@d.draw(@base_image)
end