Class: Geospatial::Line

Inherits:
Object
  • Object
show all
Defined in:
lib/geospatial/line.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(a, b) ⇒ Line

Returns a new instance of Line.



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# File 'lib/geospatial/line.rb', line 25

def initialize(a, b)
	@a = a
	@b = b
end

Instance Attribute Details

#a ⇒ Object (readonly)

Returns the value of attribute a.



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# File 'lib/geospatial/line.rb', line 30

def a
  @a
end

#b ⇒ Object (readonly)

Returns the value of attribute b.



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# File 'lib/geospatial/line.rb', line 31

def b
  @b
end

Instance Method Details

#intersect?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/geospatial/line.rb', line 37

def intersect?(other)
	t = self.offset
	o = other.offset

	d = (o[1] * t[0]) - (o[0] * t[1])

	return false if d.zero?

	na = o[0] * (self.a[1] - other.a[1]) - o[1] * (self.a[0] - other.a[0])
	
	left_time = na.fdiv(d);

	if left_time < 0.0 or left_time > 1.0
		return false
	end

	nb = t[0] * (self.a[1] - other.a[1]) - t[1] * (self.a[0] - other.a[0])
	
	right_time = nb.fdiv(d)

	if right_time < 0.0 or right_time > 1.0
		return false
	end

	return left_time
end

#offset ⇒ Object 



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# File 'lib/geospatial/line.rb', line 33

def offset
	@b - @a
end