Class: Prawn::GraphicStateStack

Inherits:

Object

• Object
• Prawn::GraphicStateStack

show all

Defined in:

lib/prawn/document/graphics_state.rb

Instance Attribute Summary (collapse)

• - (Object) stack

  Returns the value of attribute stack.

Instance Method Summary (collapse)

• - (Object) current_state
• - (Boolean) empty?
• - (GraphicStateStack) initialize(previous_state = nil) constructor

  A new instance of GraphicStateStack.

• - (Boolean) present?
• - (Object) restore_graphic_state
• - (Object) save_graphic_state(graphic_state = nil)

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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

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# File 'lib/prawn/document/graphics_state.rb', line 12

def stack
  @stack
end

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# File 'lib/prawn/document/graphics_state.rb', line 30

def current_state
  stack.last
end

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# File 'lib/prawn/document/graphics_state.rb', line 38

def empty?
  stack.empty?
end

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# File 'lib/prawn/document/graphics_state.rb', line 34

def present?
  stack.size > 0
end

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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

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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