Class: AuthorEngine::TouchJoystick

Inherits:
Object
  • Object
show all
Defined in:
lib/author_engine/game/opal/touch_joystick.rb

Instance Method Summary collapse

Constructor Details

#initialize(x:, y: nil, radius:, side:, background: nil, color: nil) ⇒ TouchJoystick

Returns a new instance of TouchJoystick.



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# File 'lib/author_engine/game/opal/touch_joystick.rb', line 3

def initialize(x:, y: nil, radius:, side:, background: nil, color: nil)
  @x, @y, @radius, @side, @background, @color = x, y, radius, side, background, color

  @buttons    = AuthorEngine::Part::OpalInput::BUTTONS
  @key_states = AuthorEngine::Part::OpalInput::KEY_STATES

  @game       = AuthorEngine::GameRunner.instance.game
  @game_width = 128 * @game.authorengine_scale
  @game_x     = `window.innerWidth/2 - #{@game_width/2}`

  if @side == :left
    @x = @game_x-@x
  elsif @side == :right
    @x = @game_x+@game_width+@x
  else
    raise "side must be :left or :right"
  end

  @y = `window.innerHeight/2` unless @y.is_a?(Numeric)
  @color = @game.dark_gray unless @color
  @background = @game.light_gray unless @background

  @joystick_x, @joystick_y, @joystick_radius = @x, @y, @radius/2
end

Instance Method Details

#circles_collide?(x, y, radius, x2, y2, radius2) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/author_engine/game/opal/touch_joystick.rb', line 44

def circles_collide?(x,y, radius, x2,y2, radius2)
  radii = radius + radius2

  if @game.distance(x,y, x2,y2) < radii
    return true
  else
    return false
  end
end

#draw ⇒ Object 



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# File 'lib/author_engine/game/opal/touch_joystick.rb', line 28

def draw
  # Background
  `#{@game.authorengine_canvas_context}.fillStyle = #{@background}`
  `#{@game.authorengine_canvas_context}.beginPath()`
  `#{@game.authorengine_canvas_context}.arc(#{@x}, #{@y}, #{@radius}, 0, 2 * Math.PI)`
  `#{@game.authorengine_canvas_context}.fill()`

  # Joystick
  `#{@game.authorengine_canvas_context}.beginPath()`
  `#{@game.authorengine_canvas_context}.fillStyle = #{@color}`
  `#{@game.authorengine_canvas_context}.arc(#{@joystick_x}, #{@joystick_y}, #{@joystick_radius}, 0, 2 * Math.PI)`
  `#{@game.authorengine_canvas_context}.fill()`

  return nil
end

#set(key, boolean) ⇒ Object 



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# File 'lib/author_engine/game/opal/touch_joystick.rb', line 118

def set(key, boolean)
  @key_states[@buttons[key]] = boolean
end

#trigger_input(threshold = 0.35) ⇒ Object 



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# File 'lib/author_engine/game/opal/touch_joystick.rb', line 82

def trigger_input(threshold = 0.35)
  threshold = @radius * threshold

  if @joystick_x != @x || @joystick_y != @y
    if (@x - @joystick_x) < -threshold
      set("right", true)
    else
      set("right", false)
    end

    if (@x - @joystick_x) > threshold
      set("left", true)
    else
      set("left", false)
    end

    if (@y - @joystick_y) < -threshold
      set("down", true)
    else
      set("down", false)
    end

    if (@y - @joystick_y) > threshold
      set("up", true)
    else
      set("up", false)
    end

  else
    set("up", false)
    set("down", false)
    set("left", false)
    set("right", false)
  end
end

#update(touches) ⇒ Object 



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# File 'lib/author_engine/game/opal/touch_joystick.rb', line 54

def update(touches)
  touch_detected = false

  touches.detect do |id, touch|
    if circles_collide?(@x, @y, @radius, touch.origin_x, touch.origin_y, 1)
      touch_detected = true

      _distance = @game.distance(@x,@y, touch.x,touch.y).clamp(0, @radius)
      _direction = Math.atan2(touch.y - @y, touch.x - @x)

      @joystick_x = @x +(_distance * Math.cos(_direction))
      @joystick_y = @y +(_distance * Math.sin(_direction))

      return true
    end
  end


  unless touch_detected
    @joystick_x = @x
    @joystick_y = @y
  end

  trigger_input

  return nil
end