Class: Ninja

Inherits:
Object
  • Object
show all
Defined in:
lib/escape_to_rubyconf/ninja.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(level, width = 128, height = 128, boundary = 80) ⇒ Ninja

Returns a new instance of Ninja.



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# File 'lib/escape_to_rubyconf/ninja.rb', line 6

def initialize level, width=128, height=128, boundary=80
  @level = level
  @width, @height = width, height
  # x and y are the center of the bounds
  @x, @y = 0, 0
  @boundary = boundary
  @tiles = Gosu::Image.load_tiles @level.window,
                                  File.dirname(__FILE__) + '/assets/ninja.png',
                                  @width, @height, false
  @direction = :right
  @state = :idle
  @states = { :walk   => { :frames => [1,2,3,4], :speed => 0.5,
                           :movement => 5,       :time => 0.0 },
              :idle   => { :frames => [0],       :speed => 1.0,
                           :movement => 0,       :time => 0.0 } }
  @bounds = [ [ @boundary/2 - 0.49, @boundary/2 - 0.49 ],
              [ @level.window.width - @boundary/2 + 0.49,
                @level.window.height - @boundary/2 + 0.49] ]

  @sneak = Gosu::Sample.new @level.window, File.dirname(__FILE__) + '/assets/ninja-walk.wav'
  @sneak_impl = nil
end

Instance Attribute Details

#boundary ⇒ Object

Returns the value of attribute boundary.



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# File 'lib/escape_to_rubyconf/ninja.rb', line 5

def boundary
  @boundary
end

#height ⇒ Object

Returns the value of attribute height.



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# File 'lib/escape_to_rubyconf/ninja.rb', line 5

def height
  @height
end

#width ⇒ Object

Returns the value of attribute width.



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# File 'lib/escape_to_rubyconf/ninja.rb', line 5

def width
  @width
end

#x ⇒ Object

Returns the value of attribute x.



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# File 'lib/escape_to_rubyconf/ninja.rb', line 5

def x
  @x
end

#y ⇒ Object

Returns the value of attribute y.



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# File 'lib/escape_to_rubyconf/ninja.rb', line 5

def y
  @y
end

Instance Method Details

#current_angle ⇒ Object 



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# File 'lib/escape_to_rubyconf/ninja.rb', line 74

def current_angle
  angle = nil
  if @level.window.button_down? Gosu::KbRight
    if @level.window.button_down? Gosu::KbUp
      45
    elsif @level.window.button_down? Gosu::KbDown
      angle = 135
    else
      angle = 90
    end
  elsif @level.window.button_down? Gosu::KbLeft
    if @level.window.button_down? Gosu::KbUp
      angle = 315
    elsif @level.window.button_down? Gosu::KbDown
      angle = 225
    else
      angle = 270
    end
  elsif @level.window.button_down? Gosu::KbUp
    angle = 0
  elsif @level.window.button_down? Gosu::KbDown
    angle = 180
  end
  angle
end

#direction_from_angle(a) ⇒ Object 



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# File 'lib/escape_to_rubyconf/ninja.rb', line 100

def direction_from_angle a
  (a >= 0 && a <= 180) ? :right : :left
end

#draw ⇒ Object 



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# File 'lib/escape_to_rubyconf/ninja.rb', line 104

def draw
  @tiles[frame].draw *draw_coordinates
end

#draw_coordinates ⇒ Object 



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# File 'lib/escape_to_rubyconf/ninja.rb', line 108

def draw_coordinates
  x = Math::round(@x - @width/2)
  y = Math::round((@y - @boundary/2)/2+200 - @height + @boundary/2)
  z = 1 + (@y/@level.window.height)
  fx = 1.0
  fy = 1.0
  if @direction == :left
    fx = -1.0
    x += @width
  end
  [x, y, z, fx, fy]
end

#frame ⇒ Object 



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# File 'lib/escape_to_rubyconf/ninja.rb', line 41

def frame
  (((@level.window.time - state[:time]) / state[:speed] % 1) * state[:frames].size).to_i + state[:frames].first
end

#idle? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/escape_to_rubyconf/ninja.rb', line 33

def idle?
  @state == :idle
end

#play_sneak ⇒ Object 



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# File 'lib/escape_to_rubyconf/ninja.rb', line 45

def play_sneak
  if @sneak_impl.nil?
    @sneak_impl = @sneak.play 1, 1, true
  end
end

#state ⇒ Object 



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# File 'lib/escape_to_rubyconf/ninja.rb', line 29

def state
  @states[idle? ? :idle : :walk]
end

#stop_sneak ⇒ Object 



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# File 'lib/escape_to_rubyconf/ninja.rb', line 51

def stop_sneak
  @sneak_impl.stop if @sneak_impl
  @sneak_impl = nil
end

#update ⇒ Object 



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# File 'lib/escape_to_rubyconf/ninja.rb', line 56

def update
  a = current_angle
  if a
    @state = :walk
    @direction = direction_from_angle a
    @x += Gosu::offset_x a, state[:movement]
    @y += Gosu::offset_y a, state[:movement]
    play_sneak
  else
    @state = :idle
    stop_sneak
  end
  @x = @bounds[0][0] if @x < @bounds[0][0]
  @x = @bounds[1][0] if @x > @bounds[1][0]
  @y = @bounds[0][1] if @y < @bounds[0][1]
  @y = @bounds[1][1] if @y > @bounds[1][1]
end

#walk? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/escape_to_rubyconf/ninja.rb', line 37

def walk?
  !idle?
end