Contents

module RubyvisCharts
  class GroupedBarTimelineChart < AbstractTimelineChart
    module DefaultArguments
      BARS_PADDING = Padding.new(right: 0.5, left: 0.5)
      BARS_COLORS = ['#4d79da'].freeze
    end

    HALF_VALUE = 2

    attr_reader :bars_padding, :bars_colors

    def initialize(
      bars_padding: DefaultArguments::BARS_PADDING,
      bars_colors: DefaultArguments::BARS_COLORS,
      **other
    )
      super(**other)

      @bars_padding = bars_padding
      @bars_colors = bars_colors

      initialize_bars!
    end

    private

    def initialize_bars!
      chart = self

      bar_left_indent = -> do
        bar_width = chart.send(:bars_widths).range_band / HALF_VALUE
        colors = chart.send(:bars_colors)
        left_padding = chart.bars_padding.left
        self.index * bar_width - (self.index % colors.length) * (bar_width - left_padding * HALF_VALUE) + left_padding
      end
      fill_style_colors = -> { chart.send(:bars_colors_iterator, self.index, self.height, chart.bars_colors) }

      @layer_timeline.add(Rubyvis::Bar)
        .data(values)
        .width(bars_widths.range_band - (bars_padding.right + bars_padding.left) * HALF_VALUE)
        .height(bars_heights)
        .left(bar_left_indent)
        .bottom(0)
        .fillStyle(fill_style_colors)
    end

    def bars_widths
      @bars_widths ||= Rubyvis::Scale.ordinal(Rubyvis.range(values.length / HALF_VALUE)).split_banded(0, timeline_width)
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
rubyvis_charts-0.1.6	lib/rubyvis_charts/grouped_bar_timeline_chart.rb