Module: Vector2d::Calculations::ClassMethods

Included in:
Vector2d
Defined in:
lib/vector2d/calculations.rb

Instance Method Summary collapse

Instance Method Details

#angle_between(vector1, vector2) ⇒ Object

Calculates angle between two vectors in radians.

v1 = Vector2d(2, 3)
v2 = Vector2d(4, 5)
Vector2d.angle_between(v1, v2) # => 0.0867..



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# File 'lib/vector2d/calculations.rb', line 32

def angle_between(vector1, vector2)
  one = vector1.normalized? ? vector1 : vector1.normalize
  two = vector2.normalized? ? vector2 : vector2.normalize
  Math.acos(dot_product(one, two))
end

#cross_product(vector1, vector2) ⇒ Object

Calculates cross product of two vectors.

v1 = Vector2d(2, 1)
v2 = Vector2d(2, 3)
Vector2d.cross_product(v1, v2) # => 4



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# File 'lib/vector2d/calculations.rb', line 12

def cross_product(vector1, vector2)
  (vector1.x * vector2.y) - (vector1.y * vector2.x)
end

#dot_product(vector1, vector2) ⇒ Object

Calculates dot product of two vectors.

v1 = Vector2d(2, 1)
v2 = Vector2d(2, 3)
Vector2d.dot_product(v1, v2) # => 10



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# File 'lib/vector2d/calculations.rb', line 22

def dot_product(vector1, vector2)
  (vector1.x * vector2.x) + (vector1.y * vector2.y)
end