Class: RQuad::Vector

Inherits:
Object
  • Object
show all
Defined in:
lib/rquad/vector.rb

Instance Method Summary collapse

Constructor Details

#initialize(x = nil, y = nil, z = nil) ⇒ Vector

Initialize a Vector with either another Vector, an Array, or 2-3 numbers.



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# File 'lib/rquad/vector.rb', line 46

def initialize(x = nil, y = nil, z = nil)
  if x && x.kind_of?(Vector)
    @x = x.x
    @y = x.y
    @z = x.z
  elsif x && x.kind_of?(Array)
    @x = x[0]
    @y = x[1]
    @z = x[2]
  else
    @x = x.to_f if x
    @y = y.to_f if y
    @z = z.to_f if z
  end
end

Instance Method Details

#*(scalar) ⇒ Object

Multiply this vector by a ‘scalar`.



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# File 'lib/rquad/vector.rb', line 125

def *(scalar)
  if z
    Vector.new(x * scalar, y * scalar, z * scalar)
  elsif x && y
    Vector.new(x * scalar, y * scalar)
  else
    Vector.new
  end
end

#+(other) ⇒ Object

Add another Vector ‘other` to this vector.



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# File 'lib/rquad/vector.rb', line 136

def +(other)
  if z && other.z
    Vector.new(x + other.x, y + other.y, z + other.z)
  elsif x && y && other.x && other.y
    Vector.new(x + other.x, y + other.y)
  else
    Vector.new
  end
end

#-(other) ⇒ Object

This vector minus another Vector ‘other`.



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# File 'lib/rquad/vector.rb', line 109

def -(other)
  self + other * -1
end

#/(scalar) ⇒ Object

Divide this vector by a ‘scalar`.



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# File 'lib/rquad/vector.rb', line 114

def /(scalar)
  if z
    Vector.new(x / scalar, y / scalar, z / scalar)
  elsif x && y
    Vector.new(x / scalar, y / scalar)
  else
    Vector.new
  end
end

#==(other) ⇒ Object

Test if this vector is equal to another Vector ‘other`.



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# File 'lib/rquad/vector.rb', line 147

def ==(other)
  result = (other.x == x && other.y == y && other.z == z)
  #    puts "(#{other.x} == #{x} && #{other.y} == #{y} && #{other.z} == #{z}) = #{result.inspect}"
  result
end

#dist_to(other) ⇒ Object

The Euclidean distnce between this and another Vector ‘other`.



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# File 'lib/rquad/vector.rb', line 104

def dist_to(other)
  (other - self).length
end

#length ⇒ Object

The length of this vector in 2D or 3D space.



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# File 'lib/rquad/vector.rb', line 93

def length
  if z
    Math.sqrt(x * x + y * y + z * z)
  elsif x && y
    Math.sqrt(x * x + y * y)
  else
    nil
  end
end

#to_s ⇒ Object

Display this vector as a String, either in <x, y> or <x, y, z> notation.



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# File 'lib/rquad/vector.rb', line 154

def to_s
  if z
    "<#{x ? x : 'nil'}, #{y ? y : 'nil'}, #{z}>"
  else
    "<#{x ? x : 'nil'}, #{y ? y : 'nil'}>"
  end
end

#x ⇒ Object

The X component of this vector.



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# File 'lib/rquad/vector.rb', line 63

def x
  @x
end

#x=(new_x) ⇒ Object

Set the X component of this vector.



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# File 'lib/rquad/vector.rb', line 78

def x=(new_x)
  @x = new_x.to_f if new_x
end

#y ⇒ Object

The Y component of this vector.



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# File 'lib/rquad/vector.rb', line 68

def y
  @y
end

#y=(new_y) ⇒ Object

Set the Y component of this vector.



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# File 'lib/rquad/vector.rb', line 83

def y=(new_y)
  @y = new_y.to_f if new_y
end

#z ⇒ Object

The Z component of this vector.



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# File 'lib/rquad/vector.rb', line 73

def z
  @z
end

#z=(new_z) ⇒ Object

Set the Z component of this vector.



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# File 'lib/rquad/vector.rb', line 88

def z=(new_z)
  @z = new_z.to_f if new_z
end