Module: Vector2d::Transformations

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

Instance Method Summary collapse

Instance Method Details

#ceil ⇒ Object

Rounds vector to up nearest integer.

Vector2d(2.4, 3.6).ceil # => Vector2d(3,4)



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# File 'lib/vector2d/transformations.rb', line 9

def ceil
  self.class.new(x.ceil, y.ceil)
end

#floor ⇒ Object

Rounds vector to up nearest integer.

Vector2d(2.4, 3.6).floor # => Vector2d(2,3)



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# File 'lib/vector2d/transformations.rb', line 17

def floor
  self.class.new(x.floor, y.floor)
end

#normalize ⇒ Object

Normalizes the vector.

vector = Vector2d(2, 3)
vector.normalize        # => Vector2d(0.5547.., 0.8320..)
vector.normalize.length # => 1.0



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# File 'lib/vector2d/transformations.rb', line 27

def normalize
  resize(1.0)
end

#perpendicular ⇒ Object

Returns a perpendicular vector.

Vector2d(2, 3).perpendicular # => Vector2d(-3,2)



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# File 'lib/vector2d/transformations.rb', line 35

def perpendicular
  Vector2d.new(-y, x)
end

#resize(new_length) ⇒ Object

Changes magnitude of vector.

Vector2d(2, 3).resize(1.0) # => Vector2d(0.5547.., 0.8320..)



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# File 'lib/vector2d/transformations.rb', line 43

def resize(new_length)
  self * (new_length / self.length)
end

#reverse ⇒ Object

Reverses the vector.

Vector2d(2, 3).reverse # => Vector2d(-2,-3)



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# File 'lib/vector2d/transformations.rb', line 51

def reverse
  self.class.new(-x, -y)
end

#round ⇒ Object

Rounds vector to nearest integer.

Vector2d(2.4, 3.6).round # => Vector2d(2,4)



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# File 'lib/vector2d/transformations.rb', line 59

def round
  self.class.new(x.round, y.round)
end

#truncate(max) ⇒ Object

Truncates to max length if vector is longer than max.

vector = Vector2d(2.0, 3.0)
vector.truncate(5.0) # => Vector2d(2.0, 3.0)
vector.truncate(1.0) # => Vector2d(0.5547.., 0.8320..)



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# File 'lib/vector2d/transformations.rb', line 69

def truncate(max)
  resize([max, self.length].min)
end