Class: Cylinder

Inherits:
Object
  • Object
show all
Defined in:
lib/hexa/objects/cylinder.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Cylinder

Create a new Cylinder object options. You can pass both a Fixnum or a Circle object to both the :radius and the :diameter options. If you pass a Circle object, the method will fetch the radius or diameter attribute

Parameters:

  • you (Hash) —

    can pass the :radius, the :diameter and the :height



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# File 'lib/hexa/objects/cylinder.rb', line 11

def initialize(options = {})

  radius = options[:radius] || nil
  diameter = options[:diameter] || nil
	height = options[:height] || nil

	# Define the cylinder radius
	if diameter and not radius
		@radius = diameter / 2
	else
		if radius.instance_of?(Circle)
			@radius = radius.send(:radius)
		elsif radius.instance_of?(Fixnum)
			@radius = radius
		else
			@radius = 1
		end
	end

	# Define the cylinder diameter
	if radius
		@diameter = @radius * 2
	else
		if diameter
			if diameter.instance_of?(Circle)
				@diameter = diameter.send(:diameter)
			elsif diameter.instance_of?(Fixnum)
				@diameter = diameter
			else
				@diameter = 2
			end
		else
			@diameter = 2
		end
	end

	# Define the cylinder height
	@height = height || 1
end

Instance Attribute Details

#diameter ⇒ Object

Returns the value of attribute diameter.



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# File 'lib/hexa/objects/cylinder.rb', line 3

def diameter
  @diameter
end

#height ⇒ Object

Returns the value of attribute height.



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# File 'lib/hexa/objects/cylinder.rb', line 3

def height
  @height
end

#radius ⇒ Object

Returns the value of attribute radius.



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# File 'lib/hexa/objects/cylinder.rb', line 3

def radius
  @radius
end

Instance Method Details

#volume ⇒ Fixnum

Return the volume of the cylinder thanks to the Math::PI * (self.radius ** 2) * self.height

Returns:

  • (Fixnum) —

    cylinder volume



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# File 'lib/hexa/objects/cylinder.rb', line 55

def volume
	Math::PI * (@radius ** 2) * @height	
end