Class: Charma::LineChart

Inherits:
Chart
  • Object
show all
Defined in:
lib/charma/line_chart.rb

Instance Method Summary collapse

Methods inherited from Chart

#abs_x_positoin, #abs_y_positoin, #bottom_legend?, #colors, #draw_samesize_texts, #draw_text, #fill_rect, #has_legend?, #render_legend, #render_rottext, #render_y_grid, #render_yticks, #scale_type, #scale_value, #stroke_rect, #tick_unit, #unscale_value, #values

Constructor Details

#initialize(opts) ⇒ LineChart

Returns a new instance of LineChart.



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# File 'lib/charma/line_chart.rb', line 5

def initialize(opts)
  super(opts)
end

Instance Method Details

#calc_range(sym) ⇒ Object 



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# File 'lib/charma/line_chart.rb', line 20

def calc_range( sym )
  r0 = scaled_values(sym).flatten.minmax
  dist = r0[1] - r0[0]
  delta = dist==0 ? 1 : dist*0.1
  raw_range =
    if 0<=r0[0]
      [[r0[0]-delta, 0].max, r0[1]+delta]
    else
      [r0[0]-delta, r0[1]+delta]
    end
  raw_range.map{ |e| unscale_value( sym, e ) }
end

#has_x_ticks? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/charma/line_chart.rb', line 62

def has_x_ticks?
  if @opts[:x_ticks].nil?
    !! @opts[:series].first[:x]
  else
    !! @opts[:x_ticks]
  end
end

#render(pdf, rect) ⇒ Object 



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# File 'lib/charma/line_chart.rb', line 106

def render( pdf, rect )
  stroke_rect(pdf, rect)
  title_text = @opts[:title]
  title, main, ticks, bottom = rect.vsplit(
    (title_text ? 1 : 0),
    7, 
    (has_x_ticks? ? 0.5 : 0),
    (bottom_legend? ? 0.5 : 0))
  draw_text( pdf, title, title_text ) if title_text
  hratio = [(@opts[:y_label] ? 1 : 0), 1, 10]
  ylabel, yticks, chart = main.hsplit(*hratio)
  xrange = @opts[:x_range] || calc_range(:x)
  yrange = @opts[:y_range] || calc_range(:y)
  render_chart(pdf, chart, xrange, yrange)
  xvalues = tick_values(:x, xrange )
  if has_x_ticks?
    _, _, xticks = ticks.hsplit(*hratio)
    render_xticks(pdf, xticks, xrange, xvalues)
  end
  render_x_grid(pdf, chart, xrange, xvalues)
  render_legend(pdf, bottom) if bottom_legend?
  yvalues = tick_values(:y, yrange)
  render_yticks(pdf, yticks, yrange, yvalues)
  render_y_grid(pdf, chart, yrange, yvalues)
    
  # end
  # if @opts[:x_ticks]
  #   _, _, xticks = ticks.hsplit(*hratio)
  #   render_xticks(pdf, xticks)
  # end
  # yvalues = ytick_values(yrange)
  # render_yticks(pdf, yticks, yrange, yvalues)
  # render_y_grid(pdf, chart, yrange, yvalues)
end

#render_chart(pdf, rect, xrange, yrange) ⇒ Object 



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# File 'lib/charma/line_chart.rb', line 50

def render_chart(pdf, rect, xrange, yrange)
  stroke_rect(pdf, rect)
  cols = colors(@opts[:series].size)
  pdf.save_graphics_state do
    pdf.line_width( 4 )
    @opts[:series].zip(cols).each do |s, col|
      pdf.stroke_color( col )
      render_series( pdf, rect, xrange, yrange, s)
    end
  end
end

#render_series(pdf, rect, xrange, yrange, s) ⇒ Object 



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# File 'lib/charma/line_chart.rb', line 33

def render_series( pdf, rect, xrange, yrange, s)
  xs = s[:x] || [*1..s[:y].size]
  ys = s[:y]
  points = xs.zip(ys).map{ |x,y|
    [
      abs_x_positoin( x, rect, xrange ),
      abs_y_positoin( y, rect, yrange )
    ]
  }
  pdf.stroke do
    pdf.move_to( *points.first )
    points.drop(1).each do |x,y|
      pdf.line_to(x,y)
    end
  end
end

#render_x_grid(pdf, area, xrange, xvalues) ⇒ Object 



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# File 'lib/charma/line_chart.rb', line 80

def render_x_grid(pdf, area, xrange, xvalues)
  pdf.save_graphics_state do
    pdf.line_width = 0.5
    xvalues.each do |v|
      if v==0
        pdf.stroke_color "000000"
        pdf.undash
      else
        pdf.stroke_color "888888"
        pdf.dash([2,2])
      end
      abs_x = abs_x_positoin( v, area, xrange )
      pdf.stroke_vertical_line area.y, area.bottom, at: abs_x
    end
  end
end

#render_xticks(pdf, area, xrange, xticks) ⇒ Object 



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# File 'lib/charma/line_chart.rb', line 70

def render_xticks(pdf, area, xrange, xticks)
  xtick_texts = @opts[:x_ticks] || xticks.map{ |e| "%g" % e }
  w = area.w*0.7 / xticks.size
  rects = xticks.map{ |rx|
    ax = abs_x_positoin( rx, area, xrange )
    Rect.new( ax-w/2, area.y, w, area.h )
  }
  draw_samesize_texts( pdf, rects, xtick_texts, valign: :top )
end

#scaled_values(sym) ⇒ Object 



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# File 'lib/charma/line_chart.rb', line 9

def scaled_values(sym)
  @opts[:series].map{ |e|
    v = e[sym]
    if v
      e[sym].map{ |v| scale_value(sym, v) }
    else
      (1..e[:y].size).map(&:to_f)
    end
  }
end

#tick_values(axis, range) ⇒ Object 



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# File 'lib/charma/line_chart.rb', line 97

def tick_values(axis, range)
  ticks = @opts[:"#{axis}_ticks"]
  if @opts[:series].first[axis] || !ticks
    super(axis, range)
  else
    (1..ticks.size).map(&:to_f)
  end
end