--- /dev/null
+
+require File.dirname(__FILE__) + '/base'
+
+class Gruff::Line < Gruff::Base
+
+ # Draw a dashed line at the given value
+ attr_accessor :baseline_value
+
+ # Color of the baseline
+ attr_accessor :baseline_color
+
+ # Hide parts of the graph to fit more datapoints, or for a different appearance.
+ attr_accessor :hide_dots, :hide_lines
+
+ # Call with target pixel width of graph (800, 400, 300), and/or 'false' to omit lines (points only).
+ #
+ # g = Gruff::Line.new(400) # 400px wide with lines
+ #
+ # g = Gruff::Line.new(400, false) # 400px wide, no lines (for backwards compatibility)
+ #
+ # g = Gruff::Line.new(false) # Defaults to 800px wide, no lines (for backwards compatibility)
+ #
+ # The preferred way is to call hide_dots or hide_lines instead.
+ def initialize(*args)
+ raise ArgumentError, "Wrong number of arguments" if args.length > 2
+ if args.empty? or ((not Numeric === args.first) && (not String === args.first)) then
+ super()
+ else
+ super args.shift
+ end
+
+ @hide_dots = @hide_lines = false
+ @baseline_color = 'red'
+ @baseline_value = nil
+ end
+
+ def draw
+ super
+
+ return unless @has_data
+
+ # Check to see if more than one datapoint was given. NaN can result otherwise.
+ @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
+
+ data_row[1].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)
+
+ # Reset each time to avoid thin-line errors
+ @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 clip_value_if_greater_than(@columns / (@norm_data.first[1].size * 4), 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)
+ end
+ circle_radius = clip_value_if_greater_than(@columns / (@norm_data.first[1].size * 2.5), 5.0)
+ @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
+
+ def normalize
+ @maximum_value = [@maximum_value.to_f, @baseline_value.to_f].max
+ super
+ @norm_baseline = (@baseline_value.to_f / @maximum_value.to_f) if @baseline_value
+ end
+
+end