Trying screencast 2 to make the player move

[Jeff Johnson]

I am running on Win7 and using Ruby192
My_game.rb reads

$: << File.expand_path(File.dirname(__FILE__))
require 'rubygems'
require 'gosu'
require 'player'

class MyGame < Gosu::Window
def initialize
super(300, 400, false)
@player = Player.new(self)
end

def update
if button_down? Gosu::Kbleft
@player1.move_left
end
end

def draw
@player.draw
end

My player.rb file reads as
class Player

def initialize(game_window)
@game_window = game_window
@icon = Gosu::Image.new(@game_window, "images/player1.png", true)
@x = 50
@y = 50
end

def draw
@icon.draw(@x, @y, 1)
end

def move_left
@x = @x - 10
end
end

When I run the ruby my_games.rb in command prompt the ruby window
opens briefly then goes away and receive the below error message

my_game.rb:12:in 'update': uninitialized constant Gosu::Kbleft
(NameError)
from my_game.rb:24:in 'show'
from my_game.rb:24:in '<main>'

Any idea what I'm doing wrong?

[NeutralAngel]

Hi Jeff,

You want to replace Gosu::KbLeft with Gosu::Button::KbLeft.

Nathan

[Alberto Morales]

The constant is. Ruby, and most programming languages are case sensitive. The L is uppercase, and I am not sure if you left the Button part of the constant name.

Gosu::Button::KbLeft

Alberto.

[Jeff Johnson]

OK. Great that worked now my_game.rb file now reads

$: << File.expand_path(File.dirname(__FILE__))
require 'rubygems'
require 'gosu'
require 'player'

class MyGame < Gosu::Window
def initialize
super(300, 400, false)
@player = Player.new(self)
end

def update

if button_down? Gosu::Button::KbLeft

@player1.move_left
end
end

def draw
@player.draw
end

end

when I go to execute in cmd prmpt the ruby screen is presented with my
image and when I press the left button the screen disappears and this
error is presented.
my_game.rb:14:in 'update': undefined method 'move_left' for
nil:NilClass <NoMethodError>
from my_game.rb:25:in 'show'
from my_game.rb:25:in '<main>'

[Alberto Morales]

@player1 = Player.new(self)

Alberto

[PastorJeffJ]

thanks works great.

On Mar 2, 5:44 pm, Alberto Morales <amora...@opnet.com> wrote:
> @player1 = Player.new(self)
>
> Alberto
>