Class: Shoes::Swt::ArrowPainter

Inherits:
Common::Painter show all
Defined in:
shoes-swt/lib/shoes/swt/arrow_painter.rb

Constant Summary

Constants inherited from Common::Painter

Common::Painter::LINECAP

Constants included from Common::Resource

Common::Resource::OPAQUE

Instance Method Summary collapse

Methods inherited from Common::Painter

#before_painted, #draw_setup, #drawing_bottom, #drawing_top, #fill_and_draw, #fill_setup, #initialize, #paint_control, #paint_object, #reset_rotate, #set_rotate

Methods included from Common::Resource

#clip_context_to, #dispose_previous_contexts, #reset_graphics_context, #set_defaults_on_context, #track_graphics_context

Constructor Details

This class inherits a constructor from Shoes::Swt::Common::Painter

Instance Method Details

#after_painted ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/arrow_painter.rb', line 60

def after_painted
  clear_path
end

#clear_path ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/arrow_painter.rb', line 64

def clear_path
  @path.dispose unless @path.nil? || @path.disposed?
  @path = nil
end

#dispose ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/arrow_painter.rb', line 56

def dispose
  clear_path
end

#draw(gc) ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/arrow_painter.rb', line 10

def draw(gc)
  gc.draw_path(path)
end

#fill(gc) ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/arrow_painter.rb', line 6

def fill(gc)
  gc.fill_path(path)
end

#path ⇒ Object 



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# File 'shoes-swt/lib/shoes/swt/arrow_painter.rb', line 14

def path
  @path ||= begin
    #
    #                                  body_right
    #
    #  head_top        body_left       |\
    #                                  | \
    #  body_top        |---------------|  \  head_right
    #                  |                   \
    #  body_middle     |           (l,t)    |
    #                  |                   /
    #  body_bottom     |---------------|  /
    #                                  | /
    #  head_bottom                     |/
    #

    body_left   = @obj.translate_left + @obj.left - @obj.width * 0.5
    body_right  = @obj.translate_left + @obj.left + @obj.width * 0.1
    body_top    = @obj.translate_top + drawing_top - @obj.width * 0.2
    body_bottom = @obj.translate_top + drawing_top + @obj.width * 0.2

    middle = @obj.translate_top + drawing_top

    head_right  = @obj.translate_left + @obj.left + @obj.width * 0.5
    head_top    = @obj.translate_top + drawing_top - @obj.width * 0.4
    head_bottom = @obj.translate_top + drawing_top + @obj.width * 0.4

    path = ::Swt::Path.new(::Swt.display)
    path.move_to(body_left, middle)
    path.line_to(body_left, body_top)
    path.line_to(body_right, body_top)
    path.line_to(body_right, head_top)
    path.line_to(head_right, middle)
    path.line_to(body_right, head_bottom)
    path.line_to(body_right, body_bottom)
    path.line_to(body_left, body_bottom)
    path.line_to(body_left, middle)

    path
  end
end