Module: BigMath

Defined in:
lib/ext/big_math.rb

Constant Summary collapse

N_ONE = 
-1.to_d
ZERO = 
0.to_d
ONE = 
1.to_d
TWO = 
2.to_d

Class Method Summary collapse

Class Method Details

.atan2(y, x, precision) ⇒ Object

en.wikipedia.org/wiki/Atan2#Definition_and_computation



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# File 'lib/ext/big_math.rb', line 10

def self.atan2 y, x, precision
  case
  when x > ZERO
    BigMath.atan((y / x), precision)
  when y >= ZERO && x < ZERO
    BigMath.atan((y / x), precision) + Terraformer::PI
  when y < ZERO && x < ZERO
    BigMath.atan((y / x), precision) - Terraformer::PI
  when x == ZERO
    case
    when y > ZERO
      Terraformer::PI / TWO
    when y < ZERO
      -(Terraformer::PI / TWO)
    when y == ZERO
      BigDecimal::NAN
    end
  end
end

.tan(theta, precision) ⇒ Object

en.wikipedia.org/wiki/Trigonometric_functions#Right-angled_triangle_definitions



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# File 'lib/ext/big_math.rb', line 32

def self.tan theta, precision
  BigMath.sin(theta, precision) / BigMath.cos(theta, precision)
end