Class: Box2D::Chain

Inherits:
Handle show all
Defined in:
lib/box2d/chain.rb

Constant Summary collapse

ID_CLASS = 
Native::ChainId

Instance Attribute Summary collapse

Attributes inherited from Handle

#id, #world

Instance Method Summary collapse

Methods inherited from Handle

#destroyed?, #eql?, #hash, #valid?

Constructor Details

#initialize(world, id, body: nil) ⇒ Chain

Returns a new instance of Chain.



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# File 'lib/box2d/chain.rb', line 9

def initialize(world, id, body: nil)
  super(world, id)
  @body = body
end

Instance Attribute Details

#body ⇒ Object (readonly)

Returns the value of attribute body.



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# File 'lib/box2d/chain.rb', line 7

def body
  @body
end

Instance Method Details

#destroy ⇒ Object 



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# File 'lib/box2d/chain.rb', line 14

def destroy
  ensure_valid!
  Native.b2DestroyChain(@id)
  invalidate!
  @world.unregister_chain(self)
  @body&.unregister_chain(self)
  true
end

#friction ⇒ Object 



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# File 'lib/box2d/chain.rb', line 35

def friction
  ensure_valid!
  Native.b2Chain_GetFriction(@id)
end

#friction=(value) ⇒ Object 



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# File 'lib/box2d/chain.rb', line 40

def friction=(value)
  ensure_valid!
  Native.b2Chain_SetFriction(@id, ValueConversion.non_negative_float(value, label: "friction"))
end

#restitution ⇒ Object 



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# File 'lib/box2d/chain.rb', line 45

def restitution
  ensure_valid!
  Native.b2Chain_GetRestitution(@id)
end

#restitution=(value) ⇒ Object 



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# File 'lib/box2d/chain.rb', line 50

def restitution=(value)
  ensure_valid!
  Native.b2Chain_SetRestitution(@id, ShapeDefinition.coefficient(value, "restitution"))
end

#segments ⇒ Object 



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# File 'lib/box2d/chain.rb', line 23

def segments
  ensure_valid!
  count = Native.b2Chain_GetSegmentCount(@id)
  pointer = FFI::MemoryPointer.new(Native::ShapeId, count)
  actual = Native.b2Chain_GetSegments(@id, pointer, count)

  Array.new(actual) do |index|
    id = Native::ShapeId.new(pointer + index * Native::ShapeId.size)
    @world.shape_for_id(id)
  end
end