Class: CTioga2::Graphics::Styles::AxisTicks

Inherits:
BasicStyle
  • Object
show all
Includes:
Log
Defined in:
lib/ctioga2/graphics/styles/ticks.rb

Overview

This class describes where to place ticks on the target axis and how to label them.

I really should drop the call to Tioga altogether. It makes everything too complicated.

Constant Summary

Constants inherited from BasicStyle

BasicStyle::AllStyles, BasicStyle::OldAttrAccessor

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Log

context, debug, error, fatal, #format_exception, #identify, info, init_logger, log_to, logger, set_level, #spawn, warn

Methods inherited from BasicStyle

alias_for, aliases, attr_accessor, attribute_type, attribute_types, attributes, convert_string_hash, defined_aliases, deprecated_attribute, from_hash, inherited, #instance_variable_defined?, normalize_hash, normalize_in, normalize_out, options_hash, #set_from_hash, sub_style, sub_styles, #to_hash, typed_attribute, #update_from_other

Class Method Details

.tweak_format_string(str) ⇒ Object 



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# File 'lib/ctioga2/graphics/styles/ticks.rb', line 84

def self.tweak_format_string(str)
  return str.gsub("%b", "%2$").gsub("%p", "%3$d")
end

Instance Method Details

#ticks_specs(t, info, transform) ⇒ Object

Returns the specifications that should be added to the information



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# File 'lib/ctioga2/graphics/styles/ticks.rb', line 90

def ticks_specs(t, info, transform)
  ret = {}
  for k in %w{major_ticks minor_ticks labels}
    ret[k] = info[k]
  end
  if info['major']
    ret['minor_ticks'] = info['minor']
    ret['major_ticks'] = info['major']
  end
  fmt = @format

  # beginning or end of the axis. Not specifically x
  xl, xr = * (if info['vertical']
                [info['y0'], info['y1']]
              else
                [info['x0'], info['x1']]
              end)

  if xl > xr
    xl, xr = xr, xl
  end

  mn = if @major_number
         @major_number
       elsif @major_sep
         dx = @major_sep.to_figure(t, info['vertical'] ? :y : :x)
         mn = (xr - xl)/dx
       else
         nil
       end

  if @major
    ret['minor_ticks'] = Dobjects::Dvector.new
    ret['major_ticks'] = Dobjects::Dvector.new(@major)

    fmt ||= "$%g$"
  elsif @major_delta || mn
    delta = @major_delta || Utils::closest_subdivision(( (xr - xl)/mn))
    ret['major_ticks'] = Utils::integer_subdivisions(xl, xr, 
                                                     delta)
    fmt ||= "$%g$"
  end

  if @minor
    ret['minor_ticks'] = Dobjects::Dvector.new(@minor)
  elsif @minor_delta || @minor_sep || delta
    
    dt = if @minor_delta
           @minor_delta
         else
           nb = if @minor_number
                  @minor_number
                elsif @minor_sep_min
                  dx = @minor_sep_min.to_figure(t, info['vertical'] ? :y : :x)
                  mx = ((delta/dx).round - 1)
                  if mx > 3
                    3
                  else
                    mx
                  end
                else
                  3
                end
           delta/(nb+1)
         end
    ret['minor_ticks'] = Utils::integer_subdivisions(xl, xr, 
                                                     dt)
  end

  fmt_last = @format_last || fmt

  if @labels
    ret['labels'] = @labels
  elsif fmt
    ret['labels'] = []
    fmt = AxisTicks.tweak_format_string(fmt)
    fmt_last = AxisTicks.tweak_format_string(fmt_last)
    i = ret['major_ticks'].size
    common = Utils::common_pow10(ret['major_ticks'])
    fact = 10**(-common)
    for v in ret['major_ticks']
      i -= 1
      ret['labels'] << (i > 0 ? fmt : fmt_last) % [v, v*fact, common]
    end
  end
  return ret
end