Class: CTioga::TangentSemiPrimitive

Inherits:
TiogaPrimitiveMaker show all
Defined in:
lib/CTioga/elements/tioga_primitives.rb

Constant Summary

Constants inherited from TiogaPrimitiveMaker

CTioga::TiogaPrimitiveMaker::Alignment, CTioga::TiogaPrimitiveMaker::Boolean, CTioga::TiogaPrimitiveMaker::Color, CTioga::TiogaPrimitiveMaker::FloatArray, CTioga::TiogaPrimitiveMaker::Justification, CTioga::TiogaPrimitiveMaker::LineStyle, CTioga::TiogaPrimitiveMaker::Marker, CTioga::TiogaPrimitiveMaker::Number, CTioga::TiogaPrimitiveMaker::PRIMITIVES, CTioga::TiogaPrimitiveMaker::Point

Instance Attribute Summary

Attributes inherited from TiogaPrimitiveMaker

#compulsory, #optional, #symbol

Instance Method Summary collapse

Methods inherited from TiogaPrimitiveMaker

#initialize, introspect, #parse_args, parse_spec

Methods included from Debug

#debug_figmaker, #debug_patterns, #debug_puts, #figmaker_options, #test_pattern, #test_pattern_right

Methods included from Log

#identify, #init_logger, #logger, #logger_options, #spawn

Constructor Details

This class inherits a constructor from CTioga::TiogaPrimitiveMaker

Instance Method Details

#make_funcall(args, plotmaker) ⇒ Object 



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# File 'lib/CTioga/elements/tioga_primitives.rb', line 259

def make_funcall(args, plotmaker)
  dict = parse_args(args)
  curve = plotmaker.last_curve
  raise 'The tangent drawing command needs to be specified *after* the curve it applies to' unless curve
  # We now need to transform
  index = curve.parse_position(dict["spec"])
  dict.delete('spec')
  debug "Tangent point index is #{index}"
  tangent = plotmaker.last_curve.tangent(index)
  debug "Tangent slope is #{tangent}"
  point = curve.function.point(index)
  debug "Tangent point is #{point}"

  # We are now preparing the coordinates of the arrow:
  # * if markonly is on, it doesn't matter much
  # * if xextent, we take the array as X extents in either
  #   direction
  # * the same obviously applies for yextent.
  # Only one spec can be used at a time
  if dict['xextent']
    fact = dict['xextent'][0]/tangent[0]
    dict['head'] = point + (tangent * fact)
    fact = (dict['xextent'][1] || 0.0)/tangent[0]
    dict['tail'] = point - (tangent * fact)
  elsif dict['yextent']
    fact = dict['yextent'][0]/tangent[1]
    dict['head'] = point + (tangent * fact)
    fact = (dict['yextent'][1] || 0.0)/tangent[1]
    dict['tail'] = point - (tangent * fact)
    # We prolong the tangent until it intersects the given
    # X= or Y= positions
  elsif dict['xuntil']
    fact = (dict['xuntil'][0] - point[0])/tangent[0]
    dict['head'] = point + (tangent * fact)
    if dict['xuntil'][1]
      fact = (dict['xuntil'][1] - point[0])/tangent[0]
    else
      fact = 0
    end
    dict['tail'] = point + (tangent * fact)
  elsif dict['yuntil']
    fact = (dict['yuntil'][0] - point[1])/tangent[1]
    dict['head'] = point + (tangent * fact)
    if dict['yuntil'][1]
      fact = (dict['yuntil'][1] - point[1])/tangent[1]
    else
      fact = 0
    end
    dict['tail'] = point + (tangent * fact)
  else
    dict['line_width'] = 0
    dict['head'] = point
    dict['tail'] = point - tangent
  end
  # Remove unnecessary keys...
  %w(spec xextent yextent xuntil yuntil).map {|k| dict.delete(k)}

  # We setup other defaults than the usual ones, from
  # the current curve.
  dict['color'] ||= curve.style.color # color from curve
  dict['line_width'] ||= curve.style.linewidth

  dict['tail_marker'] ||= 'None' # No tail by default.

  debug "Tangent coordinates: #{dict['head']} -> #{dict['tail']}"


  # And we return the Funcall...
  return TiogaFuncall.new(@symbol, dict) 
end