Class: RailroadDiagrams::Path

Inherits:
Object
  • Object
show all
Defined in:
lib/railroad_diagrams/path.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(x, y) ⇒ Path

Returns a new instance of Path.



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# File 'lib/railroad_diagrams/path.rb', line 7

def initialize(x, y)
  @x = x
  @y = y
  @attrs = { 'd' => "M#{x} #{y}" }
end

Instance Attribute Details

#attrs ⇒ Object (readonly)

Returns the value of attribute attrs.



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# File 'lib/railroad_diagrams/path.rb', line 5

def attrs
  @attrs
end

#x ⇒ Object (readonly)

Returns the value of attribute x.



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# File 'lib/railroad_diagrams/path.rb', line 5

def x
  @x
end

#y ⇒ Object (readonly)

Returns the value of attribute y.



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# File 'lib/railroad_diagrams/path.rb', line 5

def y
  @y
end

Instance Method Details

#add(parent) ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 91

def add(parent)
  parent.children << self
  self
end

#arc(sweep) ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 81

def arc(sweep)
  x = AR
  y = AR
  x *= -1 if sweep[0] == 'e' || sweep[1] == 'w'
  y *= -1 if sweep[0] == 's' || sweep[1] == 'n'
  cw = %w[ne es sw wn].include?(sweep) ? 1 : 0
  @attrs['d'] += "a#{AR} #{AR} 0 0 #{cw} #{x} #{y}"
  self
end

#arc_8(start, dir) ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 49

def arc_8(start, dir)
  arc = AR
  s2 = 1 / Math.sqrt(2) * arc
  s2inv = arc - s2
  sweep = dir == 'cw' ? '1' : '0'
  path = "a #{arc} #{arc} 0 0 #{sweep} "

  sd = start + dir
  offset = case sd
           when 'ncw' then [s2, s2inv]
           when 'necw' then [s2inv, s2]
           when 'ecw' then [-s2inv, s2]
           when 'secw' then [-s2, s2inv]
           when 'scw' then [-s2, -s2inv]
           when 'swcw' then [-s2inv, -s2]
           when 'wcw' then [s2inv, -s2]
           when 'nwcw' then [s2, -s2inv]
           when 'nccw' then [-s2, s2inv]
           when 'nwccw' then [-s2inv, s2]
           when 'wccw' then [s2inv, s2]
           when 'swccw' then [s2, s2inv]
           when 'sccw' then [s2, -s2inv]
           when 'seccw' then [s2inv, -s2]
           when 'eccw' then [-s2inv, -s2]
           when 'neccw' then [-s2, -s2inv]
           end

  path += offset.map(&:to_s).join(' ')
  @attrs['d'] += path
  self
end

#down(val) ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 41

def down(val)
  v([0, val].max)
end

#format ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 104

def format
  @attrs['d'] += 'h.5'
  self
end

#h(val) ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 23

def h(val)
  @attrs['d'] += "h#{val}"
  self
end

#l(x, y) ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 18

def l(x, y)
  @attrs['d'] += "l#{x} #{y}"
  self
end

#left(val) ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 32

def left(val)
  h(-[0, val].max)
end

#m(x, y) ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 13

def m(x, y)
  @attrs['d'] += "m#{x} #{y}"
  self
end

#right(val) ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 28

def right(val)
  h([0, val].max)
end

#text_diagram ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 109

def text_diagram
  TextDiagram.new(0, 0, [])
end

#to_s ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 113

def to_s
  "Path(#{@x.inspect}, #{@y.inspect})"
end

#up(val) ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 45

def up(val)
  v(-[0, val].max)
end

#v(val) ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 36

def v(val)
  @attrs['d'] += "v#{val}"
  self
end

#write_svg(write) ⇒ Object 



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# File 'lib/railroad_diagrams/path.rb', line 96

def write_svg(write)
  write.call('<path')
  @attrs.sort.each do |name, value|
    write.call(" #{name}=\"#{RailroadDiagrams.escape_attr(value)}\"")
  end
  write.call(' />')
end