class Gruff::Bar
Public Instance Methods
draw()
click to toggle source
Calls superclass method
# File lib/reconn/visualizer.rb, line 60 def draw @center_labels_over_point = (@labels.keys.length > @column_count ? true : false) super return unless @has_data draw_bars draw_additional_line end
draw_additional_line()
click to toggle source
Draws additional horizontal line
# File lib/reconn/visualizer.rb, line 137 def draw_additional_line @additional_line_colors << '#f61100' @d = @d.stroke_opacity 100.0 i = 0 @additional_line_values.each do |value| @increment_scaled = @graph_height.to_f / (@maximum_value.to_f / value) y = @graph_top + @graph_height - @increment_scaled @d = @d.stroke(@additional_line_colors[i]) @d = @d.line(@graph_left, y, @graph_right, y) @d.fill = @additional_line_colors[i] @d.font = @font if @font @d.stroke('transparent') @d.pointsize = scale_fontsize(@marker_font_size) @d.gravity = EastGravity @d = @d.annotate_scaled( @base_image, @graph_right - LABEL_MARGIN, 1.0, 0.0, y - (@marker_font_size/2.0), label(value, value), @scale) i += 1 end @d = @d.stroke_antialias true end
draw_bars()
click to toggle source
# File lib/reconn/visualizer.rb, line 68 def draw_bars # Setup spacing. # # Columns sit side-by-side. @bar_spacing ||= @spacing_factor # space between the bars @bar_width = @graph_width / (@column_count * @data.length).to_f padding = (@bar_width * (1 - @bar_spacing)) / 2 @d = @d.stroke_opacity 0.0 # Setup the BarConversion Object conversion = Gruff::BarConversion.new() conversion.graph_height = @graph_height conversion.graph_top = @graph_top # Set up the right mode [1,2,3] see BarConversion for further explanation if @minimum_value >= 0 then # all bars go from zero to positiv conversion.mode = 1 else # all bars go from 0 to negativ if @maximum_value <= 0 then conversion.mode = 2 else # bars either go from zero to negativ or to positiv conversion.mode = 3 conversion.spread = @spread conversion.minimum_value = @minimum_value conversion.zero = -@minimum_value/@spread end end # iterate over all normalised data @norm_data.each_with_index do |data_row, row_index| data_row[DATA_VALUES_INDEX].each_with_index do |data_point, point_index| # Use incremented x and scaled y # x left_x = @graph_left + (@bar_width * (row_index + point_index + ((@data.length - 1) * point_index))) + padding right_x = left_x + @bar_width * @bar_spacing # y conv = [] conversion.get_left_y_right_y_scaled( data_point, conv ) # create new bar @d = @d.fill data_row[DATA_COLOR_INDEX] @d = @d.rectangle(left_x, conv[0], right_x, conv[1]) # 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) # Subtract half a bar width to center left if requested draw_label(label_center - (@center_labels_over_point ? @bar_width / 2.0 : 0.0), point_index) if @show_labels_for_bar_values val = (@label_formatting || '%.2f') % @norm_data[row_index][3][point_index] draw_value_label(left_x + (right_x - left_x)/2, conv[0]-30, val.commify, true) end end end # Draw the last label if requested draw_label(@graph_right, @column_count) if @center_labels_over_point draw_additional_line @d.draw(@base_image) end