Class: Scratchpad::SheetModel

Inherits:
GLib::Object
  • Object
show all
Includes:
Cairo, Math
Defined in:
lib/scratchpad.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(width, height) ⇒ SheetModel

Returns a new instance of SheetModel.



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# File 'lib/scratchpad.rb', line 137

def initialize(width, height)
  super()
  @surface         = ImageSurface.new(Cairo::FORMAT_ARGB32, width, height)
  @debug_surface   = ImageSurface.new(Cairo::FORMAT_ARGB32, width, height)
  @outline_surface = ImageSurface.new(Cairo::FORMAT_ARGB32, width, height)

  cr = Context.new(@surface)
  cr.set_operator(Cairo::OPERATOR_OVER)
  cr.line_cap = cr.line_join = :round
  @context = cr

  @pen = Pen.new

  @portion = :all
end

Instance Attribute Details

#debug_surface ⇒ Object (readonly)

Returns the value of attribute debug_surface.



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# File 'lib/scratchpad.rb', line 135

def debug_surface
  @debug_surface
end

#outline_surface ⇒ Object (readonly)

Returns the value of attribute outline_surface.



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# File 'lib/scratchpad.rb', line 135

def outline_surface
  @outline_surface
end

#pen ⇒ Object (readonly)

Returns the value of attribute pen.



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# File 'lib/scratchpad.rb', line 135

def pen
  @pen
end

#surface ⇒ Object (readonly)

Returns the value of attribute surface.



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# File 'lib/scratchpad.rb', line 135

def surface
  @surface
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/scratchpad.rb', line 157

def clear
  clear_surface(@surface)
  clear_surface(@outline_surface)
  clear_surface(@debug_surface)
  signal_emit('changed')
end

#clear_surface(surface) ⇒ Object 



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# File 'lib/scratchpad.rb', line 164

def clear_surface(surface)
  c = Context.new(surface)
  c.save do
    c.set_operator(Cairo::OPERATOR_SOURCE)
    c.set_source_rgba(0, 0, 0, 0)
    c.paint
  end
  c.destroy
end

#cr ⇒ Object 



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# File 'lib/scratchpad.rb', line 153

def cr
  @context
end

#normalize(ary) ⇒ Object 



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# File 'lib/scratchpad.rb', line 184

def normalize(ary)
  sum = ary.max
  ary.map { |x| x / sum }
end

#pen_down(ev) ⇒ Object 



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# File 'lib/scratchpad.rb', line 174

def pen_down(ev)
  @pen.down(ev)
  @portion = :latter_half
end

#pen_move(ev) ⇒ Object 



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# File 'lib/scratchpad.rb', line 246

def pen_move(ev)
  @pen.move(ev)
  update
end

#pen_up(ev) ⇒ Object 



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# File 'lib/scratchpad.rb', line 179

def pen_up(ev)
  @pen.up(ev)
  @portion = :first_half
end

#stroke_outline(path) ⇒ Object 



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# File 'lib/scratchpad.rb', line 227

def stroke_outline(path)
  cr = Cairo::Context.new(@outline_surface)
  cr.line_cap = cr.line_join = :round
  cr.set_source_rgba([1, 1, 1, 1.0])
  cr.line_width = @pen.radius * 3
  stroke_path(cr, path)
end

#stroke_path(cr, path) ⇒ Object 



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# File 'lib/scratchpad.rb', line 235

def stroke_path(cr, path)
  path.each.with_index do |(x, y, radius), i|
    if i == 0
	cr.move_to(x, y)
    else
      cr.line_to(x, y)
    end
  end
  cr.stroke
end

#update ⇒ Object 



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# File 'lib/scratchpad.rb', line 189

def update
  if @pen.down?
    case @portion 
    when :all
      path = @pen.path

      stroke_outline(path)

      cr.set_source_rgba(@pen.color)
      cr.line_width = @pen.radius
      stroke_path(cr, path)
    when :latter_half
      path = @pen.path[5..10] || []

      stroke_outline(path)

      cr.set_source_rgba(@pen.color)
      cr.line_width = @pen.radius
      stroke_path(cr, path)
    end
    @portion = :all
    signal_emit('changed')
  else
    if @portion == :first_half
      path = @pen.path[0..4] || []

      stroke_outline(path)

      cr.set_source_rgba(@pen.color)
      cr.line_width = @pen.radius
      stroke_path(cr, path)

      @portion = :all
      signal_emit('changed')
    end
  end
end