Class: GR::Plot

Inherits:
Object
  • Object
show all
Defined in:
lib/gr/plot.rb

Overview

This class offers a simple, matlab-style API built on top of the GR package. The class name Plot may be changed in the future.

Constant Summary collapse

PLOT_KIND =

Plot kinds conform to GR.jl

%i[line step scatter stem hist contour contourf hexbin heatmap
nonuniformheatmap wireframe surface plot3 scatter3 imshow
isosurface polar polarhist polarheatmap nonuniformpolarheatmap
trisurf tricont shade volume].freeze
KW_ARGS =

Keyword options conform to GR.jl.

%i[accelerate algorithm alpha ax backgroundcolor barwidth baseline
clabels clear clim color colormap crange figsize font grid
horizontal isovalue kind label labels levels linewidth location
nbins ratio rotation scale size spec subplot tilt title update
xaxis xflip xform xlabel xlim xlog xrange xticks yaxis yflip
ylabel ylim ylog zflip yrange yticks viewport vp where window
zaxis zlabel zlim zlog zrange zticks].freeze
FONTS =
{
  times_roman: 101,
  times_italic: 102,
  times_bold: 103,
  times_bolditalic: 104,
  helvetica_regular: 105,
  helvetica_oblique: 106,
  helvetica_bold: 107,
  helvetica_boldoblique: 108,
  courier_regular: 109,
  courier_oblique: 110,
  courier_bold: 111,
  courier_boldoblique: 112,
  symbol: 113,
  bookman_light: 114,
  bookman_lightitalic: 115,
  bookman_demi: 116,
  bookman_demiitalic: 117,
  newcenturyschlbk_roman: 118,
  newcenturyschlbk_italic: 119,
  newcenturyschlbk_bold: 120,
  newcenturyschlbk_bolditalic: 121,
  avantgarde_book: 122,
  avantgarde_bookoblique: 123,
  avantgarde_demi: 124,
  avantgarde_demioblique: 125,
  palatino_roman: 126,
  palatino_italic: 127,
  palatino_bold: 128,
  palatino_bolditalic: 129,
  zapfchancery_mediumitalic: 130,
  zapfdingbats: 131,
  cmuserif_math: 232, # original: cmuserif-math
  dejavusans: 233
}.freeze

Class Attribute Summary collapse

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*raw_args) ⇒ Plot

Returns a new instance of Plot.


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# File 'lib/gr/plot.rb', line 91

def initialize(*raw_args)
  @kvs = raw_args.last.is_a?(Hash) ? raw_args.pop : {}
  @args = plot_args(raw_args) # method name is the same as Julia/Python

  # Check keyword options.
  kvs.each_key { |k| warn "Unknown keyword: #{k}" unless KW_ARGS.include? k }

  # label(singular form) is a original keyword arg which GR.jl does not have.
  kvs[:labels] ||= [kvs[:label]] if kvs.has_key? :label

  # Don't use ||= here, because we need to tell `false` from `nil`
  kvs[:size]    = [600, 450]   unless kvs.has_key? :size
  kvs[:ax]      = false        unless kvs.has_key? :ax
  kvs[:subplot] = [0, 1, 0, 1] unless kvs.has_key? :subplot
  kvs[:clear]   = true         unless kvs.has_key? :clear
  kvs[:update]  = true         unless kvs.has_key? :update

  @scheme     = 0
  @background = 0xffffff
  # @handle     = nil           # This variable will be used in gr_meta

  self.class.last_plot = self
end

Class Attribute Details

.last_plotObject

Returns the value of attribute last_plot


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# File 'lib/gr/plot.rb', line 86

def last_plot
  @last_plot
end

Instance Attribute Details

#argsObject

Returns the value of attribute args


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# File 'lib/gr/plot.rb', line 89

def args
  @args
end

#kvsObject

Returns the value of attribute kvs


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# File 'lib/gr/plot.rb', line 89

def kvs
  @kvs
end

#schemeObject

Returns the value of attribute scheme


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# File 'lib/gr/plot.rb', line 89

def scheme
  @scheme
end

Instance Method Details

#colorbar(off = 0, colors = 256) ⇒ Object


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# File 'lib/gr/plot.rb', line 571

def colorbar(off = 0, colors = 256)
  GR.savestate
  viewport = kvs[:viewport]
  zmin, zmax = kvs[:zrange]
  mask = (GR::OPTION_Z_LOG | GR::OPTION_FLIP_Y | GR::OPTION_FLIP_Z)
  options = if kvs.has_key?(:zflip)
              (GR.inqscale | GR::OPTION_FLIP_Y)
            elsif kvs.has_key?(:yflip)
              GR.inqscale & ~GR::OPTION_FLIP_Y
            else
              GR.inqscale
            end
  GR.setscale(options & mask)
  h = 0.5 * (zmax - zmin) / (colors - 1)
  GR.setwindow(0, 1, zmin, zmax)
  GR.setviewport(viewport[1] + 0.02 + off, viewport[1] + 0.05 + off,
                 viewport[2], viewport[3])
  l = linspace(1000, 1255, colors).map(&:round)
  GR.cellarray(0, 1, zmax + h, zmin - h, 1, colors, l)
  GR.setlinecolorind(1)
  diag = Math.sqrt((viewport[1] - viewport[0])**2 + (viewport[3] - viewport[2])**2)
  charheight = [0.016 * diag, 0.012].max
  GR.setcharheight(charheight)
  if kvs[:scale] & GR::OPTION_Z_LOG == 0
    ztick = auto_tick(zmin, zmax)
    GR.axes(0, ztick, 1, zmin, 0, 1, 0.005)
  else
    GR.setscale(GR::OPTION_Y_LOG)
    GR.axes(0, 2, 1, zmin, 0, 1, 0.005)
  end
  GR.restorestate
end

#draw_axes(kind, pass = 1) ⇒ Object


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# File 'lib/gr/plot.rb', line 324

def draw_axes(kind, pass = 1)
  viewport = kvs[:viewport]
  vp = kvs[:vp]
  ratio = kvs[:ratio]
  xtick, xorg, majorx = kvs[:xaxis]
  ytick, yorg, majory = kvs[:yaxis]
  drawgrid = kvs.has_key?(:grid) ? kvs[:grid] : true
  xtick = 10 if kvs[:scale] & GR::OPTION_X_LOG != 0
  ytick = 10 if kvs[:scale] & GR::OPTION_Y_LOG != 0
  GR.setlinecolorind(1)
  diag = Math.sqrt((viewport[1] - viewport[0])**2 + (viewport[3] - viewport[2])**2)
  GR.setlinewidth(1)
  ticksize = 0.0075 * diag
  if %i[wireframe surface plot3 scatter3 trisurf volume].include?(kind)
    charheight = [0.024 * diag, 0.012].max
    GR.setcharheight(charheight)
    ztick, zorg, majorz = kvs[:zaxis]
    if pass == 1 && drawgrid
      GR.grid3d(xtick, 0, ztick, xorg[0], yorg[1], zorg[0], 2, 0, 2)
      GR.grid3d(0, ytick, 0, xorg[0], yorg[1], zorg[0], 0, 2, 0)
    else
      GR.axes3d(xtick, 0, ztick, xorg[0], yorg[0], zorg[0], majorx, 0, majorz, -ticksize)
      GR.axes3d(0, ytick, 0, xorg[1], yorg[0], zorg[0], 0, majory, 0, ticksize)
    end
  else
    charheight = [0.018 * diag, 0.012].max
    GR.setcharheight(charheight)
    if %i[heatmap nonuniformheatmap shade].include?(kind)
      ticksize = -ticksize
    elsif drawgrid
      GR.grid(xtick, ytick, 0, 0, majorx, majory)
    end
    if kvs.has_key?(:xticklabels) || kvs.has_key?(:yticklabels)
      fx = if kvs.has_key?(:xticklabels)
             GRCommons::Fiddley::Function.new(
               :void, %i[double double string double]
             ) do |x, y, _svalue, value|
               label = value < 0 ? '' : kvs[:xticklabels][value] || ''
               GR.textext(x, y, label)
             end
           else
             GRCommons::Fiddley::Function.new(
               :void, %i[double double string double]
             ) do |x, y, _svalue, value|
               GR.textext(x, y, value.to_s)
             end
           end
      fy = if kvs.has_key?(:yticklabels)
             GRCommons::Fiddley::Function.new(
               :void, %i[double double string double]
             ) do |x, y, _svalue, value|
               label = value < 0 ? '' : kvs[:yticklabels][value] || ''
               GR.textext(x, y, label)
             end
           else
             GRCommons::Fiddley::Function.new(
               :void, %i[double double string double]
             ) do |x, y, _svalue, value|
               GR.textext(x, y, value.to_s)
             end
           end
      GR.axeslbl(xtick, ytick, xorg[0], yorg[0], majorx, majory, ticksize, fx, fy)
    else
      GR.axes(xtick, ytick, xorg[0], yorg[0], majorx, majory, ticksize)
    end
    GR.axes(xtick, ytick, xorg[1], yorg[1], -majorx, -majory, -ticksize)
  end

  if kvs.has_key?(:title)
    GR.savestate
    GR.settextalign(GR::TEXT_HALIGN_CENTER, GR::TEXT_VALIGN_TOP)
    text(0.5 * (viewport[0] + viewport[1]), vp[3], kvs[:title].to_s)
    GR.restorestate
  end
  if %i[wireframe surface plot3 scatter3 trisurf volume].include?(kind)
    xlabel = (kvs[:xlabel] || '').to_s
    ylabel = (kvs[:ylabel] || '').to_s
    zlabel = (kvs[:zlabel] || '').to_s
    GR.titles3d(xlabel, ylabel, zlabel)
  else
    if kvs.has_key?(:xlabel)
      GR.savestate
      GR.settextalign(GR::TEXT_HALIGN_CENTER, GR::TEXT_VALIGN_BOTTOM)
      text(0.5 * (viewport[0] + viewport[1]), vp[2] + 0.5 * charheight, kvs[:xlabel].to_s)
      GR.restorestate
    end
    if kvs.has_key?(:ylabel)
      GR.savestate
      GR.settextalign(GR::TEXT_HALIGN_CENTER, GR::TEXT_VALIGN_TOP)
      GR.setcharup(-1, 0)
      text(vp[0] + 0.5 * charheight, 0.5 * (viewport[2] + viewport[3]), kvs[:ylabel].to_s)
      GR.restorestate
    end
  end
end

#draw_legendObject


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# File 'lib/gr/plot.rb', line 973

def draw_legend
  w, h = legend_size
  viewport = kvs[:viewport]
  location = kvs[:location] || 1
  num_labels = kvs[:labels].length
  GR.savestate
  GR.selntran 0
  GR.setscale 0
  px = case location
       when 11, 12, 13
         viewport[1] + 0.11
       when 8, 9, 10
         0.5 * (viewport[0] + viewport[1] - w + 0.05)
       when 2, 3, 6
         viewport[0] + 0.11
       else
         viewport[1] - 0.05 - w
       end
  py = case location
       when 5, 6, 7, 10, 12
         0.5 * (viewport[2] + viewport[3] + h - 0.03)
       when 13
         viewport[2] + h
       when 3, 4, 8
         viewport[2] + h + 0.03
       when 11
         viewport[3] - 0.03
       else
         viewport[3] - 0.06
       end
  GR.setfillintstyle(GR::INTSTYLE_SOLID)
  GR.setfillcolorind(0)
  GR.fillrect(px - 0.08, px + w + 0.02, py + 0.03, py - h)
  GR.setlinetype(GR::LINETYPE_SOLID)
  GR.setlinecolorind(1)
  GR.setlinewidth(1)
  GR.drawrect(px - 0.08, px + w + 0.02, py + 0.03, py - h)
  i = 0
  GR.uselinespec(' ')
  args.each do |_x, _y, _z, _c, spec|
    if i < num_labels
      label = kvs[:labels][i]
      label = label.to_s
      _tbx, tby = inqtext(0, 0, label)
      dy = [(tby[2] - tby[0]) - 0.03, 0].max
      py -= 0.5 * dy
    end
    GR.savestate
    mask = GR.uselinespec(spec || '')
    GR.polyline([px - 0.07, px - 0.01], [py, py]) if hasline(mask)
    GR.polymarker([px - 0.06, px - 0.02], [py, py]) if hasmarker(mask)
    GR.restorestate
    GR.settextalign(GR::TEXT_HALIGN_LEFT, GR::TEXT_VALIGN_HALF)
    if i < num_labels
      text(px, py, label)
      py -= 0.5 * dy
      i += 1
    end
    py -= 0.03
  end
  GR.selntran(1)
  GR.restorestate
end

#draw_polar_axesObject


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# File 'lib/gr/plot.rb', line 420

def draw_polar_axes
  viewport = kvs[:viewport]
  diag = Math.sqrt((viewport[1] - viewport[0])**2 + (viewport[3] - viewport[2])**2)
  charheight = [0.018 * diag, 0.012].max

  window = kvs[:window]
  rmin = window[2]
  rmax = window[3]

  GR.savestate
  GR.setcharheight(charheight)
  GR.setlinetype(GR::LINETYPE_SOLID)

  tick = auto_tick(rmin, rmax)
  n = ((rmax - rmin) / tick + 0.5).round
  (n + 1).times do |i|
    r = i.to_f / n
    if i.even?
      GR.setlinecolorind(88)
      GR.drawarc(-r, r, -r, r, 0, 359) if i > 0
      GR.settextalign(GR::TEXT_HALIGN_LEFT, GR::TEXT_VALIGN_HALF)
      x, y = GR.wctondc(0.05, r)
      GR.text(x, y, (rmin + i * tick).to_s) # FIXME: round. significant digits.
    else
      GR.setlinecolorind(90)
      GR.drawarc(-r, r, -r, r, 0, 359)
    end
  end
  0.step(by: 45, to: 315) do |alpha|
    sinf = Math.sin(alpha * Math::PI / 180)
    cosf = Math.cos(alpha * Math::PI / 180)
    GR.polyline([cosf, 0], [sinf, 0])
    GR.settextalign(GR::TEXT_HALIGN_CENTER, GR::TEXT_VALIGN_HALF)
    x, y = GR.wctondc(1.1 * cosf, 1.1 * sinf)
    GR.textext(x, y, "#{alpha}^o")
  end
  GR.restorestate
end

#plot_data(_figure = true) ⇒ Object


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# File 'lib/gr/plot.rb', line 604

def plot_data(_figure = true)
  # GR.init

  # target = GR.displayname
  # if flag && target != None
  #   if target == "js" || target == "meta"
  #       send_meta(0)
  #   else
  #       send_serialized(target)
  #   end
  #   return
  # end

  kind = kvs[:kind] || :line
  GR.clearws if kvs[:clear]

  if scheme != 0
    # Not yet.
  end

  if kvs.has_key?(:font)
    name = kvs[:font]
    # 'Cmuserif-Math' => :cmuserif_math
    sym_name = name.to_s.gsub('-', '_').downcase.to_sym
    if FONTS.include?(sym_name)
      font = FONTS[sym_name]
      GR.settextfontprec(font, font > 200 ? 3 : 0)
    else
      font = GR.loadfont(name)
      if font >= 0
        GR.settextfontprec(font, 3)
      else
        warn "Unknown font name: #{name}"
      end
    end
  else
    # The following fonts are the default in GR.jl
    # Japanese, Chinese, Korean, etc. cannot be displayed.

    # GR.settextfontprec(232, 3) # CM Serif Roman
  end

  set_viewport(kind, kvs[:subplot])
  unless kvs[:ax]
    set_window(kind)
    if %i[polar polarhist].include?(kind)
      draw_polar_axes
    elsif !%i[imshow isosurface polarheatmap nonuniformpolarheatmap].include?(kind)
      draw_axes(kind)
    end
  end

  if kvs.has_key?(:colormap)
    GR.setcolormap(kvs[:colormap])
  else
    GR.setcolormap(GR::COLORMAP_VIRIDIS)
  end

  GR.uselinespec(' ')
  args.each do |x, y, z, c, spec|
    spec ||= kvs[:spec] ||= ''
    GR.savestate
    GR.settransparency(kvs[:alpha]) if kvs.has_key?(:alpha)

    case kind

    when :line
      mask = GR.uselinespec(spec)
      linewidth = kvs[:linewidth]
      # Slightly different from Julia,
      # Because the implementation of polyline and polymarker is different.
      z ||= linewidth # FIXME
      GR.polyline(x, y, z, c) if hasline(mask)
      GR.polymarker(x, y, z, c) if hasmarker(mask)

    when :step
      mask = GR.uselinespec(spec)
      if hasline(mask)
        where = kvs[:where] || 'mid'
        n = x.length
        xs = [x[0]]
        case where
        when 'pre'
          ys = [y[0]]
          (n - 1).times do |i|
            xs << x[i]     << x[i + 1]
            ys << y[i + 1] << y[i + 1]
          end
        when 'post'
          ys = [y[0]]
          (n - 1).times do |i|
            xs << x[i + 1] << x[i + 1]
            ys << y[i]     << y[i + 1]
          end
        else
          ys = []
          (n - 1).times do |i|
            xs << 0.5 * (x[i] + x[i + 1]) << 0.5 * (x[i] + x[i + 1])
            ys << y[i] << y[i]
          end
          xs << x[n - 1]
          ys << y[n - 1] << y[n - 1]
        end
        GR.polyline(xs, ys)
      end
      GR.polymarker(x, y) if hasmarker(mask)

    when :scatter
      GR.setmarkertype(GR::MARKERTYPE_SOLID_CIRCLE)
      z = z&.map { |i| i * 0.01 }
      c = c&.map { |i| normalize_color(i, *kvs[:crange]) }
      GR.polymarker(x, y, z, c)

    when :stem
      GR.setlinecolorind(1)
      GR.polyline(kvs[:window][0..1], [0, 0])
      GR.setmarkertype(GR::MARKERTYPE_SOLID_CIRCLE)
      GR.uselinespec(spec)
      x = x.to_a if narray?(x)
      y = y.to_a if narray?(y)
      x.zip(y).each do |xi, yi|
        GR.polyline([xi, xi], [0, yi])
      end
      GR.polymarker(x, y)

    when :hist
      if kvs[:horizontal]
        xmin = kvs[:window][0]
        x.length.times do |i|
          GR.setfillcolorind(989)
          GR.setfillintstyle(GR::INTSTYLE_SOLID)
          GR.fillrect(xmin, x[i], y[i], y[i + 1])
          GR.setfillcolorind(1)
          GR.setfillintstyle(GR::INTSTYLE_HOLLOW)
          GR.fillrect(xmin, x[i], y[i], y[i + 1])
        end
      else
        ymin = kvs[:window][2]
        y.length.times do |i|
          GR.setfillcolorind(989)
          GR.setfillintstyle(GR::INTSTYLE_SOLID)
          GR.fillrect(x[i], x[i + 1], ymin, y[i])
          GR.setfillcolorind(1)
          GR.setfillintstyle(GR::INTSTYLE_HOLLOW)
          GR.fillrect(x[i], x[i + 1], ymin, y[i])
        end
      end

    when :polarhist
      ymax = kvs[:window][3].to_f
      ρ = y.map { |i| i / ymax }
      θ = x.map { |i| i * 180 / Math::PI }
      (1...ρ.length).each do |i|
        GR.setfillcolorind(989)
        GR.setfillintstyle(GR::INTSTYLE_SOLID)
        GR.fillarc(-ρ[i], ρ[i], -ρ[i], ρ[i], θ[i - 1], θ[i])
        GR.setfillcolorind(1)
        GR.setfillintstyle(GR::INTSTYLE_HOLLOW)
        GR.fillarc(-ρ[i], ρ[i], -ρ[i], ρ[i], θ[i - 1], θ[i])
      end

    when :polarheatmap, :nonuniformpolarheatmap
      w, h = z.shape
      cmap = colormap
      cmin, cmax = kvs[:zrange]
      data = z.map { |i| normalize_color(i, cmin, cmax) }
      data.reverse(axis: 0) if kvs[:xflip]
      data.reverse(axis: 1) if kvs[:yflip]
      colors = data * 255 + 1000
      colors = colors.transpose # Julia is column major
      case kind
      when :polarheatmap
        GR.polarcellarray(0, 0, 0, 360, 0, 1, w, h, colors)
      when :nonuniformpolarheatmap
        ymax = y.max.to_f
        ρ = y.map { |i| i / ymax }
        θ = x.map { |i| i * 180 / Math::PI }
        GR.nonuniformpolarcellarray(θ, ρ, w, h, colors)
      end
      draw_polar_axes
      kvs[:zrange] = [cmin, cmax]
      colorbar

    when :contour, :contourf
      zmin, zmax = kvs[:zrange]
      if narray?(z) && z.ndim == 2
        a, b = z.shape
        x = (1..b).to_a
        y = (1..a).to_a
        zmin, zmax = z.minmax
      elsif equal_length(x, y, z)
        x, y, z = GR.gridit(x, y, z, 200, 200)
        zmin, zmax = z.compact.minmax # compact : removed nil
      end

      # kvs[:zlim] is supposed to be Array or Range
      if kvs.has_key?(:zlim)
        zmin = kvs[:zlim].first if kvs[:zlim].first
        zmax = kvs[:zlim].last if kvs[:zlim].last
      end
      GR.setprojectiontype(0)
      GR.setspace(zmin, zmax, 0, 90)
      levels = kvs[:levels] || 0
      clabels = kvs[:clabels] || false
      if levels.is_a? Integer
        hmin, hmax = GR.adjustrange(zmin, zmax)
        h = linspace(hmin, hmax, levels == 0 ? 21 : levels + 1)
      else
        h = levels
      end
      case kind
      when :contour
        GR._contour_(x, y, h, z, clabels ? 1 : 1000)
      when :contourf
        GR._contourf_(x, y, h, z, clabels ? 1 : 0)
      end
      colorbar(0, h.length)

    when :hexbin
      nbins = kvs[:nbins] || 40
      cntmax = GR._hexbin_(x, y, nbins)
      if cntmax > 0
        kvs[:zrange] = [0, cntmax]
        colorbar
      end

    when :heatmap, :nonuniformheatmap
      case z
      when Array
        if z.all? { |zi| zi.size = z[0].size }
          w = z.size
          h = z[0].size
        else
          raise
        end
      when ->(obj) { narray?(obj) }
        w, h = z.shape
      else
        raise
      end
      cmap = colormap
      cmin, cmax = kvs[:crange]
      levels = kvs[:levels] || 256
      data = z.flatten.to_a.map { |i| normalize_color(i, cmin, cmax) } # NArray -> Array
      if kind == :heatmap
        rgba = data.map { |v| to_rgba(v, cmap) }
        GR.drawimage(0.5, w + 0.5, h + 0.5, 0.5, w, h, rgba)
      else
        colors = data.map { |i| (1000 + i * 255).round }
        GR.nonuniformcellarray(x, y, w, h, colors)
      end
      colorbar(0, levels)

    when :wireframe
      if narray?(z) && z.ndim == 2
        a, b = z.shape
        x = (1..b).to_a
        y = (1..a).to_a
      elsif equal_length(x, y, z)
        x, y, z = GR.gridit(x, y, z, 50, 50)
      end
      GR.setfillcolorind(0)
      GR._surface_(x, y, z, GR::OPTION_FILLED_MESH)
      draw_axes(kind, 2)

    when :surface
      if narray?(z) && z.ndim == 2
        a, b = z.shape
        x = (1..b).to_a
        y = (1..a).to_a
      elsif equal_length(x, y, z)
        x, y, z = GR.gridit(x, y, z, 200, 200)
      end
      if kvs[:accelerate] == false
        GR._surface_(x, y, z, GR::OPTION_COLORED_MESH)
      else
        require 'gr3'
        GR3.clear
        GR3.surface(x, y, z, GR::OPTION_COLORED_MESH)
      end
      draw_axes(kind, 2)
      colorbar(0.05)

    when :volume
      algorithm = kvs[:algorithm] || 0
      require 'gr3'
      GR3.clear
      dmin, dmax = GR3.volume(z, algorithm)
      draw_axes(kind, 2)
      kvs[:zrange] = [dmin, dmax]
      colorbar(0.05)

    when :plot3
      mask = GR.uselinespec(spec)
      GR.polyline3d(x, y, z) if hasline(mask)
      GR.polymarker3d(x, y, z) if hasmarker(mask)
      draw_axes(kind, 2)

    when :scatter3
      GR.setmarkertype(GR::MARKERTYPE_SOLID_CIRCLE)
      if c
        cmin, cmax = kvs[:crange]
        c = c.map { |i| normalize_color(i, cmin, cmax) }
        cind = c.map { |i| (1000 + i * 255).round }
        x.length.times do |i|
          GR.setmarkercolorind(cind[i])
          GR.polymarker3d([x[i]], [y[i]], [z[i]])
        end
      else
        GR.polymarker3d(x, y, z)
      end
      draw_axes(kind, 2)

    when :imshow
      plot_img(z)

    when :isosurface
      plot_iso(z)

    when :polar
      GR.uselinespec(spec)
      plot_polar(x, y)

    when :trisurf
      GR.trisurface(x, y, z)
      draw_axes(kind, 2)
      colorbar(0.05)

    when :tricont
      zmin, zmax = kvs[:zrange]
      levels = linspace(zmin, zmax, 20)
      GR.tricontour(x, y, z, levels)

    when :shade
      xform = kvs[:xform] || 5
      if x.to_a.include? Float::NAN # FIXME: Ruby is different from Julia?
        # How to check NArray?
        GR.shadelines(x, y, xform: xform)
      else
        GR.shadepoints(x, y, xform: xform)
      end

    when :bar
      0.step(x.length - 1, 2) do |i|
        GR.setfillcolorind(989)
        GR.setfillintstyle(GR::INTSTYLE_SOLID)
        GR.fillrect(x[i], x[i + 1], y[i], y[i + 1])
        GR.setfillcolorind(1)
        GR.setfillintstyle(GR::INTSTYLE_HOLLOW)
        GR.fillrect(x[i], x[i + 1], y[i], y[i + 1])
      end
    end

    GR.restorestate
  end

  draw_legend if %i[line step scatter stem].include?(kind) && kvs.has_key?(:labels)

  if kvs[:update]
    GR.updatews
    # if GR.isinline()
    #  restore_context()
    #  return GR.show()
    # end
  end

  # flag && restore_context()
end

#plot_img(img) ⇒ Object


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# File 'lib/gr/plot.rb', line 473

def plot_img(img)
  viewport = kvs[:vp].clone
  viewport[3] -= 0.05 if kvs.has_key?(:title)
  vp = kvs[:vp]

  if img.is_a? String
    width, height, data = GR.readimage(img)
  else
    height, width = img.shape
    cmin, cmax = kvs[:crange]
    data = img.map { |i| normalize_color(i, cmin, cmax) }
    data = data.map { |i| (1000 + i * 255).round }
  end

  if width * (viewport[3] - viewport[2]) < height * (viewport[1] - viewport[0])
    w = width.to_f / height * (viewport[3] - viewport[2])
    xmin = [0.5 * (viewport[0] + viewport[1] - w), viewport[0]].max
    xmax = [0.5 * (viewport[0] + viewport[1] + w), viewport[1]].min
    ymin = viewport[2]
    ymax = viewport[3]
  else
    h = height.to_f / width * (viewport[1] - viewport[0])
    xmin = viewport[0]
    xmax = viewport[1]
    ymin = [0.5 * (viewport[3] + viewport[2] - h), viewport[2]].max
    ymax = [0.5 * (viewport[3] + viewport[2] + h), viewport[3]].min
  end

  GR.selntran(0)
  GR.setscale(0)
  if kvs.has_key?(:xflip)
    tmp = xmax
    xmax = xmin
    xmin = tmp
  end
  if kvs.has_key?(:yflip)
    tmp = ymax
    ymax = ymin
    ymin = tmp
  end
  if img.is_a? String
    GR.drawimage(xmin, xmax, ymin, ymax, width, height, data)
  else
    GR.cellarray(xmin, xmax, ymin, ymax, width, height, data)
  end

  if kvs.has_key?(:title)
    GR.savestate
    GR.settextalign(GR::TEXT_HALIGN_CENTER, GR::TEXT_VALIGN_TOP)
    text(0.5 * (viewport[0] + viewport[1]), vp[3], kvs[:title].to_s)
    GR.restorestate
  end
  GR.selntran(1)
end

#plot_iso(v) ⇒ Object


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# File 'lib/gr/plot.rb', line 528

def plot_iso(v)
  viewport = kvs[:viewport]

  if viewport[3] - viewport[2] < viewport[1] - viewport[0]
    width = viewport[3] - viewport[2]
    centerx = 0.5 * (viewport[0] + viewport[1])
    xmin = [centerx - 0.5 * width, viewport[0]].max
    xmax = [centerx + 0.5 * width, viewport[1]].min
    ymin = viewport[2]
    ymax = viewport[3]
  else
    height = viewport[1] - viewport[0]
    centery = 0.5 * (viewport[2] + viewport[3])
    xmin = viewport[0]
    xmax = viewport[1]
    ymin = [centery - 0.5 * height, viewport[2]].max
    ymax = [centery + 0.5 * height, viewport[3]].min
  end

  GR.selntran(0)
  v = Numo::DFloat.cast(v) if v.is_a? Array
  values = ((v - v.min) / (v.max - v.min) * (2**16 - 1)).round
  values = Numo::UInt16.cast(values)
  nx, ny, nz = v.shape
  isovalue = ((kvs[:isovalue] || 0.5) - v.min) / (v.max - v.min)
  rotation = ((kvs[:rotation] || 40) * Math::PI / 180.0)
  tilt = ((kvs[:tilt] || 70) * Math::PI / 180.0)
  r = 2.5
  GR3.clear
  mesh = GR3.createisosurfacemesh(values, [2.0 / (nx - 1), 2.0 / (ny - 1), 2.0 / (nz - 1)],
                                  [-1, -1, -1],
                                  (isovalue * (2**16 - 1)).round)
  color = kvs[:color] || [0.0, 0.5, 0.8]
  GR3.setbackgroundcolor(1, 1, 1, 0)
  GR3.drawmesh(mesh, 1, [0, 0, 0], [0, 0, 1], [0, 1, 0], color, [1, 1, 1])
  GR3.cameralookat(r * Math.sin(tilt) * Math.sin(rotation),
                   r * Math.cos(tilt), r * Math.sin(tilt) * Math.cos(rotation),
                   0, 0, 0, 0, 1, 0)
  GR3.drawimage(xmin, xmax, ymin, ymax, 500, 500, GR3::DRAWABLE_GKS)
  GR3.deletemesh(mesh)
  GR.selntran(1)
end

#plot_polar(θ, ρ) ⇒ Object


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# File 'lib/gr/plot.rb', line 459

def plot_polar(θ, ρ)
  window = kvs[:window]
  rmax = window[3].to_f
  ρ = ρ.map { |i| i / rmax }
  n = ρ.length
  x = []
  y = []
  n.times do |i|
    x << ρ[i] * Math.cos(θ[i])
    y << ρ[i] * Math.sin(θ[i])
  end
  GR.polyline(x, y)
end

#set_viewport(kind, subplot) ⇒ Object


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# File 'lib/gr/plot.rb', line 115

def set_viewport(kind, subplot)
  mwidth, mheight, width, height = GR.inqdspsize
  dpi = width / mwidth * 0.0254
  w, h = if kvs[:figsize]
           [(0.0254 * width  * kvs[:figsize][0] / mwidth),
            (0.0254 * height * kvs[:figsize][1] / mheight)]
         elsif dpi > 200
           kvs[:size].map { |i| i * dpi / 100 }
         else
           kvs[:size]
         end

  vp = subplot.clone

  if w > h
    ratio = h / w.to_f
    msize = mwidth * w / width
    GR.setwsviewport(0, msize, 0, msize * ratio)
    GR.setwswindow(0, 1, 0, ratio)
    vp[2] *= ratio
    vp[3] *= ratio
  else
    ratio = w / h.to_f
    msize = mheight * h / height
    GR.setwsviewport(0, msize * ratio, 0, msize)
    GR.setwswindow(0, ratio, 0, 1)
    vp[0] *= ratio
    vp[1] *= ratio
  end

  if %i[wireframe surface plot3 scatter3 trisurf volume].include?(kind)
    extent = [vp[1] - vp[0], vp[3] - vp[2]].min
    vp1 = 0.5 * (vp[0] + vp[1] - extent)
    vp2 = 0.5 * (vp[0] + vp[1] + extent)
    vp3 = 0.5 * (vp[2] + vp[3] - extent)
    vp4 = 0.5 * (vp[2] + vp[3] + extent)
  else
    vp1, vp2, vp3, vp4 = vp
  end

  left_margin = kvs.has_key?(:ylabel) ? 0.05 : 0
  right_margin = if %i[contour contourf hexbin heatmap nonuniformheatmap polarheatmap
                       nonuniformpolarheatmap surface trisurf volume].include?(kind)
                   (vp2 - vp1) * 0.1
                 else
                   0
                 end
  bottom_margin = kvs.has_key?(:xlabel) ? 0.05 : 0
  top_margin = kvs.has_key?(:title) ? 0.075 : 0

  viewport = [vp1 + (0.075 + left_margin) * (vp2 - vp1),
              vp1 + (0.95 - right_margin) * (vp2 - vp1),
              vp3 + (0.075 + bottom_margin) * (vp4 - vp3),
              vp3 + (0.975 - top_margin) * (vp4 - vp3)]

  if %i[line step scatter stem].include?(kind) && kvs[:labels]
    location = kvs[:location] || 1
    if [11, 12, 13].include?(location)
      w, h = legend_size
      viewport[1] -= w + 0.1
    end
  end

  GR.setviewport(*viewport)

  kvs[:viewport] = viewport
  kvs[:vp]       = vp
  kvs[:ratio]    = ratio

  if kvs[:backgroundcolor]
    GR.savestate
    GR.selntran(0)
    GR.setfillintstyle(GR::INTSTYLE_SOLID)
    GR.setfillcolorind(kvs[:backgroundcolor])
    if w > h
      GR.fillrect(subplot[0], subplot[1],
                  ratio * subplot[2], ratio * subplot[3])
    else
      GR.fillrect(ratio * subplot[0], ratio * subplot[1],
                  subplot[2], subplot[3])
    end
    GR.selntran(1)
    GR.restorestate
  end

  if %i[polar polarhist polarheatmap nonuniformpolarheatmap].include? kind
    xmin, xmax, ymin, ymax = viewport
    xcenter = 0.5 * (xmin + xmax)
    ycenter = 0.5 * (ymin + ymax)
    r = 0.5 * [xmax - xmin, ymax - ymin].min
    GR.setviewport(xcenter - r, xcenter + r, ycenter - r, ycenter + r)
  end
end

#set_window(kind) ⇒ Object


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# File 'lib/gr/plot.rb', line 209

def set_window(kind)
  scale = 0
  unless %i[polar polarhist polarheatmap nonuniformpolarheatmap].include?(kind)
    scale |= GR::OPTION_X_LOG  if kvs[:xlog]
    scale |= GR::OPTION_Y_LOG  if kvs[:ylog]
    scale |= GR::OPTION_Z_LOG  if kvs[:zlog]
    scale |= GR::OPTION_FLIP_X if kvs[:xflip]
    scale |= GR::OPTION_FLIP_Y if kvs[:yflip]
    scale |= GR::OPTION_FLIP_Z if kvs[:zflip]
  end
  kvs[:scale] = scale

  if kvs.has_key?(:panzoom)
    xmin, xmax, ymin, ymax = GR.panzoom(*kvs[:panzoom])
    kvs[:xrange] = [xmin, xmax]
    kvs[:yrange] = [ymin, ymax]
  else
    minmax(kind)
  end

  major_count = if %i[wireframe surface plot3 scatter3 polar polarhist
                      polarheatmap nonuniformpolarheatmap trisurf volume].include?(kind)
                  2
                else
                  5
                end

  kvs[:xticks] = [kvs[:xticks], major_count] if kvs[:xticks].is_a? Numeric
  kvs[:yticks] = [kvs[:yticks], major_count] if kvs[:yticks].is_a? Numeric
  kvs[:zticks] = [kvs[:zticks], major_count] if kvs[:zticks].is_a? Numeric

  xmin, xmax = kvs[:xrange]
  if %i[heatmap polarheatmap].include?(kind) && kvs.has_key?(:xlim)
    xmin -= 0.5
    xmax += 0.5
  end
  xtick, majorx = if (scale & GR::OPTION_X_LOG) == 0
                    if !%i[heatmap polarheatmap].include?(kind) &&
                       !kvs.has_key?(:xlim) &&
                       !kvs[:panzoom]
                      xmin, xmax = GR.adjustlimits(xmin, xmax)
                    end
                    if kvs.has_key?(:xticks)
                      kvs[:xticks]
                    else
                      [auto_tick(xmin, xmax) / major_count, major_count]
                    end
                  else
                    [1, 1]
                  end
  xorg = (scale & GR::OPTION_FLIP_X) == 0 ? [xmin, xmax] : [xmax, xmin]
  kvs[:xaxis] = xtick, xorg, majorx

  ymin, ymax = kvs[:yrange]
  if %i[heatmap polarheatmap].include?(kind) && kvs.has_key?(:ylim)
    ymin -= 0.5
    ymax += 0.5
  end
  if kind == :hist
    if kvs[:horizontal] && !kvs.has_key?(:xlim)
      xmin = (scale & GR::OPTION_X_LOG) == 0 ? 0 : 1
    elsif !kvs.has_key?(:ylim)
      ymin = (scale & GR::OPTION_Y_LOG) == 0 ? 0 : 1
    end
  end
  ytick, majory = if (scale & GR::OPTION_Y_LOG) == 0
                    if !%i[heatmap polarheatmap].include?(kind) &&
                       !kvs.has_key?(:ylim) &&
                       !kvs[:panzoom]
                      ymin, ymax = GR.adjustlimits(ymin, ymax)
                    end
                    if kvs.has_key?(:yticks)
                      kvs[:yticks]
                    else
                      [auto_tick(ymin, ymax) / major_count, major_count]
                    end
                  else
                    [1, 1]
                  end
  yorg = (scale & GR::OPTION_FLIP_Y) == 0 ? [ymin, ymax] : [ymax, ymin]
  kvs[:yaxis] = ytick, yorg, majory

  if %i[wireframe surface plot3 scatter3 trisurf volume].include?(kind)
    zmin, zmax = kvs[:zrange]
    ztick, majorz = if (scale & GR::OPTION_Z_LOG) == 0
                      zmin, zmax = GR.adjustlimits(zmin, zmax) if kvs.has_key?(:zlim)
                      if kvs.has_key?(:zticks)
                        kvs[:zticks]
                      else
                        [auto_tick(zmin, zmax) / major_count, major_count]
                      end
                    else
                      [1, 1]
                    end
    zorg = (scale & GR::OPTION_FLIP_Z) == 0 ? [zmin, zmax] : [zmax, zmin]
    kvs[:zaxis] = ztick, zorg, majorz
  end

  kvs[:window] = xmin, xmax, ymin, ymax
  if %i[polar polarhist polarheatmap nonuniformpolarheatmap trisurf].include?(kind)
    GR.setwindow(-1, 1, -1, 1)
  else
    GR.setwindow(xmin, xmax, ymin, ymax)
  end
  if %i[wireframe surface plot3 scatter3 trisurf volume].include?(kind)
    rotation = kvs[:rotation] || 40
    tilt     = kvs[:tilt]     || 60
    GR.setwindow3d(xmin, xmax, ymin, ymax, zmin, zmax)
    GR.setspace3d(-rotation, tilt, 30, 0)
  end

  kvs[:scale] = scale
  GR.setscale(scale)
end

#to_svgObject


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# File 'lib/gr/plot.rb', line 1037

def to_svg
  ## Need IRuby improvemend.
  GR.show(false) if ENV['GKS_WSTYPE'] == 'svg'
end