Class: Ccharts::Settings::StackSettings

Inherits:
Object
  • Object
show all
Defined in:
lib/ccharts/settings.rb

Overview

stacked bar

Instance Method Summary collapse

Constructor Details

#initialize ⇒ StackSettings

Returns a new instance of StackSettings.



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# File 'lib/ccharts/settings.rb', line 214

def initialize
  @colors = nil
  @bg = nil
  @cat_labels = nil
  @show_labels = false
  @show_prices = false
  @plain = false
end

Instance Method Details

#background(v) ⇒ Object 



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# File 'lib/ccharts/settings.rb', line 224

def background(v); @bg = v; self; end

#category_labels(v) ⇒ Object 



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# File 'lib/ccharts/settings.rb', line 225

def category_labels(v); @cat_labels = v; self; end

#colors(v) ⇒ Object 



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# File 'lib/ccharts/settings.rb', line 223

def colors(v); @colors = v; self; end

#counts(series_count, cats_count) ⇒ Object

inject the series/category counts known only at render time



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# File 'lib/ccharts/settings.rb', line 231

def counts(series_count, cats_count)
  @series_count = series_count
  @cats_count = cats_count
  self
end

#plain(v) ⇒ Object 



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# File 'lib/ccharts/settings.rb', line 228

def plain(v); @plain = !!v; self; end

#show_labels(v) ⇒ Object 



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# File 'lib/ccharts/settings.rb', line 226

def show_labels(v); @show_labels = !!v; self; end

#show_prices(v) ⇒ Object 



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# File 'lib/ccharts/settings.rb', line 227

def show_prices(v); @show_prices = !!v; self; end

#to_ffi ⇒ Object 



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# File 'lib/ccharts/settings.rb', line 237

def to_ffi
  s = FFI::StackSettings.malloc
  keep = []

  # NULL-terminated per-series color pointer array.
  color_ptrs = []
  if @plain
    @series_count.times { color_ptrs << FFI::EMPTY.to_i }
  elsif @colors && !@colors.empty?
    @colors.each do |c|
      p = FFI.color_ptr(c, false)
      keep << p
      color_ptrs << p.to_i
    end
  end
  colors_addr = if color_ptrs.empty?
                  Fiddle::NULL
                else
                  Fiddle::Pointer[(color_ptrs + [0]).pack("Q*")].to_i
                end

  bgp = FFI.color_ptr(@bg, @plain)
  keep << bgp

  cat_ptrs = []
  if @cat_labels && !@cat_labels.empty?
    @cat_labels.each do |l|
      p = FFI.cstr(l)
      keep << p
      cat_ptrs << p.to_i
    end
  end
  cat_addr = cat_ptrs.empty? ? Fiddle::NULL : Fiddle::Pointer[cat_ptrs.pack("Q*")].to_i

  s.colors = colors_addr
  s.bg_color = bgp.to_i
  s.cat_labels = cat_addr
  s.series = @series_count
  s.cats = @cats_count
  s.show_labels = @show_labels ? 1 : 0
  s.show_prices = @show_prices ? 1 : 0
  [s, keep]
end