Class: CTioga2::Graphics::Styles::ArrowStyle

Inherits:
StrokeStyle show all
Defined in:
lib/ctioga2/graphics/styles/arrows.rb

Overview

This class represents an arrow

Direct Known Subclasses

OrientedLineStyle

Constant Summary collapse

TiogaDefaults = 
{
  'head_marker' => Tioga::MarkerConstants::Arrowhead,
  'tail_marker' => Tioga::MarkerConstants::BarThin
}

Constants inherited from BasicStyle

BasicStyle::AllStyles, BasicStyle::OldAttrAccessor

Instance Method Summary collapse

Methods inherited from StrokeStyle

#set_stroke_style

Methods inherited from LineStyle

#draw_line, #set_stroke_style

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, #use_defaults_from

Instance Method Details

#draw_arrow(t, x1, y1, x2, y2) ⇒ Object

Draws an arrow.



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# File 'lib/ctioga2/graphics/styles/arrows.rb', line 59

def draw_arrow(t, x1, y1, x2, y2)
  dx = x2 - x1
  dy = y2 - y1

  angle = Types::Dimension.get_angle(t, dx, dy)

  len = Types::Dimension.get_distance(t, dx, dy)

  rs = symbol_size(t, "head")
  ls = symbol_size(t, "tail")

  x1n, y1n, x2n, y2n = *Types::Dimension::adjust_line(t, x1, y1, x2, y2, -ls, -rs)

  # Must shorten the path first...
  sv = t.line_cap
  
  # This has for effect to disable changing the line cap when
  # there are now arrows to draw.
  if ! (has_marker?('head') || has_marker?('tail'))
    sv = Tioga::FigureConstants::LINE_CAP_BUTT
  end
  if sv != Tioga::FigureConstants::LINE_CAP_BUTT
    t.line_cap = Tioga::FigureConstants::LINE_CAP_BUTT
  end
  draw_line(t, x1n, y1n, x2n, y2n)
  if sv != Tioga::FigureConstants::LINE_CAP_BUTT
    t.line_cap = sv
  end

  # Then, draw the arrow heads/tails
  draw_symbol(t, 'head', angle, x2, y2)
  draw_symbol(t, 'tail', angle - 180, x1, y1)
  
end

#old_draw_arrow(t, x1, y1, x2, y2) ⇒ Object 



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# File 'lib/ctioga2/graphics/styles/arrows.rb', line 43

def old_draw_arrow(t, x1, y1, x2, y2)
  dict = self.to_hash
  dict.rename_key('width', 'line_width')
  dict.rename_key('style', 'line_style')
  dict['head'] = [x2,y2]
  dict['tail'] = [x1,y1]
  for w in %w(head tail)
    if dict["#{w}_marker"] == false
      dict["#{w}_marker"] = "None"
    end
  end
  t.show_arrow(dict)
end