Class: UnicodePlot::GridCanvas

Inherits:
Plot
  • Object
show all
Defined in:
lib/unicode_plot/lineplot.rb

Direct Known Subclasses

Lineplot

Constant Summary collapse

MIN_WIDTH = 
5
DEFAULT_WIDTH = 
40
MIN_HEIGHT = 
2
DEFAULT_HEIGHT = 
15

Constants inherited from Plot

Plot::COLOR_CYCLE, Plot::DEFAULT_BORDER, Plot::DEFAULT_MARGIN, Plot::DEFAULT_PADDING

Constants included from StyledPrinter

StyledPrinter::COLOR_DECODE, StyledPrinter::COLOR_ENCODE, StyledPrinter::DISABLE_TEXT_STYLE, StyledPrinter::TEXT_COLORS

Instance Attribute Summary

Attributes inherited from Plot

#border, #colors_deco, #colors_left, #colors_right, #decorations, #labels_left, #labels_right, #margin, #padding, #title, #xlabel, #ylabel

Instance Method Summary collapse

Methods inherited from Plot

#annotate!, #annotate_row!, #next_color, #render, #show_labels?, #title_given?, #to_s, #xlabel_given?, #ylabel_given?, #ylabel_length

Methods included from StyledPrinter

#color?, #print_color, #print_styled

Constructor Details

#initialize(x, y, canvas, width: DEFAULT_WIDTH, height: DEFAULT_HEIGHT, xlim: [0, 0], ylim: [0, 0], grid: true, **kw) ⇒ GridCanvas

Returns a new instance of GridCanvas.



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# File 'lib/unicode_plot/lineplot.rb', line 10

def initialize(x, y, canvas,
               width: DEFAULT_WIDTH,
               height: DEFAULT_HEIGHT,
               xlim: [0, 0], 
               ylim: [0, 0],
               grid: true,
               **kw)
  unless xlim.length == 2 && ylim.length == 2
    raise ArgumentError, "xlim and ylim must be 2-length arrays"
  end
  width = [width, MIN_WIDTH].max
  height = [height, MIN_HEIGHT].max
  min_x, max_x = extend_limits(x, xlim)
  min_y, max_y = extend_limits(y, ylim)
  origin_x = min_x
  origin_y = min_y
  plot_width = max_x - origin_x
  plot_height = max_y - origin_y
  @canvas = Canvas.create(canvas, width, height,
                          origin_x: origin_x,
                          origin_y: origin_y,
                          plot_width: plot_width,
                          plot_height: plot_height)
  super(**kw)

  min_x_str = (roundable?(min_x) ? min_x.round : min_x).to_s
  max_x_str = (roundable?(max_x) ? max_x.round : max_x).to_s
  min_y_str = (roundable?(min_y) ? min_y.round : min_y).to_s
  max_y_str = (roundable?(max_y) ? max_y.round : max_y).to_s

  annotate_row!(:l, 0, max_y_str, color: :light_black)
  annotate_row!(:l, height-1, min_y_str, color: :light_black)
  annotate!(:bl, min_x_str, color: :light_black)
  annotate!(:br, max_x_str, color: :light_black)

  if grid
    if min_y < 0 && 0 < max_y
      step = plot_width.fdiv(width * @canvas.x_pixel_per_char - 1)
      min_x.step(max_x, by: step) do |i|
        @canvas.point!(i, 0, :normal)
      end
    end
    if min_x < 0 && 0 < max_x
      step = plot_height.fdiv(height * @canvas.y_pixel_per_char - 1)
      min_y.step(max_y, by: step) do |i|
        @canvas.point!(0, i, :normal)
      end
    end
  end
end

Instance Method Details

#ceil_neg_log10(x) ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 141

def ceil_neg_log10(x)
  if roundable?(-Math.log10(x))
    (-Math.log10(x)).ceil
  else
    (-Math.log10(x)).floor
  end
end

#extend_limits(values, limits) ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 97

def extend_limits(values, limits)
  mi, ma = limits.minmax.map(&:to_f)
  if mi == 0 && ma == 0
    mi, ma = values.minmax.map(&:to_f)
  end
  diff = ma - mi
  if diff == 0
    ma = mi + 1
    mi = mi - 1
  end
  if limits == [0, 0]
    plotting_range_narrow(mi, ma)
  else
    [mi, ma]
  end
end

#lines!(x, y, color) ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 89

def lines!(x, y, color)
  @canvas.lines!(x, y, color)
end

#n_columns ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 81

def n_columns
  @canvas.width
end

#n_rows ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 77

def n_rows
  @canvas.height
end

#origin_x ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 61

def origin_x
  @canvas.origin_x
end

#origin_y ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 65

def origin_y
  @canvas.origin_y
end

#plot_height ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 73

def plot_height
  @canvas.plot_height
end

#plot_width ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 69

def plot_width
  @canvas.plot_width
end

#plotting_range_narrow(xmin, xmax) ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 114

def plotting_range_narrow(xmin, xmax)
  diff = xmax - xmin
  xmax = round_up_subtick(xmax, diff)
  xmin = round_down_subtick(xmin, diff)
  [xmin.to_f, xmax.to_f]
end

#points!(x, y, color) ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 85

def points!(x, y, color)
  @canvas.points!(x, y, color)
end

#print_row(out, row_index) ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 93

def print_row(out, row_index)
  @canvas.print_row(out, row_index)
end

#round_down_subtick(x, m) ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 131

def round_down_subtick(x, m)
  if x == 0
    0.0
  elsif x > 0
    x.floor(ceil_neg_log10(m) + 1)
  else
    -(-x).ceil(ceil_neg_log10(m) + 1)
  end
end

#round_up_subtick(x, m) ⇒ Object 



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# File 'lib/unicode_plot/lineplot.rb', line 121

def round_up_subtick(x, m)
  if x == 0
    0.0
  elsif x > 0
    x.ceil(ceil_neg_log10(m) + 1)
  else
    -(-x).floor(ceil_neg_log10(m) + 1)
  end
end

#roundable?(x) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/unicode_plot/lineplot.rb', line 149

def roundable?(x)
  x.to_i == x
end