# frozen_string_literal: true require_relative 'helper/stacked_mixin' # # New gruff graph type added to enable sideways stacking bar charts # (basically looks like a x/y flip of a standard stacking bar chart) # # Here's how to set up a Gruff::SideStackedBar. # # g = Gruff::SideStackedBar.new # g.title = 'SideStackedBar Graph' # g.labels = { # 0 => '5/6', # 1 => '5/15', # 2 => '5/24', # 3 => '5/30', # } # g.data :Art, [0, 5, 8, 15] # g.data :Philosophy, [10, 3, 2, 8] # g.data :Science, [2, 15, 8, 11] # g.write('side_stacked_bar.png') # class Gruff::SideStackedBar < Gruff::SideBar include StackedMixin # Spacing factor applied between bars. attr_writer :bar_spacing # Number of pixels between bar segments. attr_writer :segment_spacing # Set the number output format string or lambda. # Default is +"%.2f"+. attr_writer :label_formatting # Output the values for the bars on a bar graph. # Default is +false+. attr_writer :show_labels_for_bar_values # Prevent drawing of column labels left of a side stacked bar graph. Default is +false+. attr_writer :hide_labels def initialize(*) super @has_left_labels = true end private def initialize_attributes super @bar_spacing = 0.9 @segment_spacing = 2.0 @label_formatting = nil @show_labels_for_bar_values = false @hide_labels = false @minimum_value = 0.0 end def setup_data calculate_maximum_by_stack super end def draw_graph # Setup spacing. # # Columns sit stacked. bar_width = @graph_height / column_count padding = (bar_width * (1 - @bar_spacing)) / 2 # Setup the BarConversion Object conversion = Gruff::BarConversion.new( top: @graph_right, bottom: @graph_left, minimum_value: minimum_value, maximum_value: maximum_value, spread: @spread ) proc_text_metrics = ->(text) { text_metrics(@marker_font, text) } normalized_stacked_bars.each_with_index do |stacked_bars, stacked_index| total = 0 left_y = @graph_top + (bar_width * stacked_index) + padding right_y = left_y + (bar_width * @bar_spacing) top_x = 0 stacked_bars.each do |bar| next if bar.point == 0 bottom_x, = conversion.get_top_bottom_scaled(total) bottom_x += @segment_spacing top_x, = conversion.get_top_bottom_scaled(total + bar.point) rect_renderer = Gruff::Renderer::Rectangle.new(renderer, color: bar.color) rect_renderer.render(bottom_x, left_y, top_x, right_y) total += bar.point end label_center = left_y + (bar_width / 2.0) draw_label(label_center, stacked_index) if @show_labels_for_bar_values bar_value_label = Gruff::BarValueLabel::SideBar.new([@graph_left, left_y, top_x, right_y], stacked_bars.sum(&:value)) bar_value_label.prepare_rendering(@label_formatting, proc_text_metrics) do |x, y, text, text_width, _text_height| draw_value_label(text_width, bar_width * @bar_spacing, x, y, text) end end end end end