Class: RubyPost::Path

Inherits:
Drawable show all
Defined in:
lib/drawable.rb

Overview

sequence of pairs connected as a metapost path

Direct Known Subclasses

Square

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Path

Returns a new instance of Path.



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# File 'lib/drawable.rb', line 125

def initialize
  super()
  @p = Array.new
  straight
end

Instance Attribute Details

#line_type=(value) ⇒ Object (writeonly)

Sets the attribute line_type

Parameters:

  • value —

    the value to set the attribute line_type to.



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# File 'lib/drawable.rb', line 123

def line_type=(value)
  @line_type = value
end

Instance Method Details

#add_pair(p) ⇒ Object 



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# File 'lib/drawable.rb', line 131

def add_pair(p)
  @p.push(p)
  self
end

#center(p) ⇒ Object

returns a pair that is the centroid of the pairs of this path



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# File 'lib/drawable.rb', line 138

def center(p)
  ret = Pair.new
  @p.each { |p| ret = ret + p }
  return ret/p.length
end

#clone ⇒ Object 



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# File 'lib/drawable.rb', line 173

def clone
  c = Path.new
  @p.each{ |i| c.add_pair(i) }
  c.line_type = @line_type
  c
end

#compile ⇒ Object 



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# File 'lib/drawable.rb', line 165

def compile
  str = '('
  (@p.length-1).times do |i|
    str = str + @p[i].compile + @line_type
  end
  str + @p[-1].compile + ')'
end

#curved ⇒ Object

set the path to have curved line segments



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# File 'lib/drawable.rb', line 160

def curved
  @line_type = '..'
  self
end

#reverse ⇒ Object

reverse the path.
Note, this reverses the pairs that have so far been added. Anything added after calling reverse will be appended to the end of the array as usual



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# File 'lib/drawable.rb', line 148

def reverse
  @p = @p.reverse
  self
end

#straight ⇒ Object

set the path to have straight line segments



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# File 'lib/drawable.rb', line 154

def straight
  @line_type = '--'
  self
end