Class: Prawn::GraphicStateStack
- Inherits:
-
Object
- Object
- Prawn::GraphicStateStack
- Defined in:
- lib/prawn/document/graphics_state.rb
Instance Attribute Summary collapse
-
#stack ⇒ Object
Returns the value of attribute stack.
Instance Method Summary collapse
- #current_state ⇒ Object
- #empty? ⇒ Boolean
-
#initialize(previous_state = nil) ⇒ GraphicStateStack
constructor
A new instance of GraphicStateStack.
- #present? ⇒ Boolean
- #restore_graphic_state ⇒ Object
- #save_graphic_state(graphic_state = nil) ⇒ Object
Constructor Details
#initialize(previous_state = nil) ⇒ GraphicStateStack
Returns a new instance of GraphicStateStack.
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# File 'lib/prawn/document/graphics_state.rb', line 14 def initialize(previous_state = nil) self.stack = [GraphicState.new(previous_state)] end |
Instance Attribute Details
#stack ⇒ Object
Returns the value of attribute stack.
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# File 'lib/prawn/document/graphics_state.rb', line 12 def stack @stack end |
Instance Method Details
#current_state ⇒ Object
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# File 'lib/prawn/document/graphics_state.rb', line 30 def current_state stack.last end |
#empty? ⇒ Boolean
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# File 'lib/prawn/document/graphics_state.rb', line 38 def empty? stack.empty? end |
#present? ⇒ Boolean
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# File 'lib/prawn/document/graphics_state.rb', line 34 def present? stack.size > 0 end |
#restore_graphic_state ⇒ Object
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# File 'lib/prawn/document/graphics_state.rb', line 22 def restore_graphic_state if stack.empty? raise Prawn::Errors::EmptyGraphicStateStack, "\n You have reached the end of the graphic state stack" end stack.pop end |
#save_graphic_state(graphic_state = nil) ⇒ Object
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# File 'lib/prawn/document/graphics_state.rb', line 18 def save_graphic_state(graphic_state = nil) stack.push(GraphicState.new(graphic_state || current_state)) end |