Game Development Reference
In-Depth Information
21
music
.
stop
22
$window
.
mouse_x,
$window
.
mouse_y
=
@mouse_coords
23
end
24
25
def
music
26
@@music
||=
Gosu
::
Song
.
new(
$window
,
Utils
.
media_path(
'menu_music.mp3'
))
27
28
end
29
30
def
draw
31
@play_state
.
draw
32
@message
.
draw(
33
$window
.
width
/ 2 -
@message
.
width
/ 2
,
34
$window
.
height
/ 4 -
@message
.
height,
35
1000
)
36
@score_display
.
draw
37
end
38
39
def
button_down
(
id
)
40
$window
.
close
if
id
==
Gosu
::
KbQ
41
if
id
==
Gosu
::
KbC
&&
@play_state
42
GameState
.
switch(
@play_state
)
43
end
44
if
id
==
Gosu
::
KbEscape
45
GameState
.
switch(
@play_state
)
46
end
47
end
48
end
You will notice that
PauseState
invokes
PlayState#draw
, but without
PlayState#update
this will be a still image. We make sure we hide the crosshair
and restore previous mouse location when resuming play state. That way player would
not be able to cheat by pausing the game, targeting the tank while nothing moves and
then unpausing ready to deal damage. Our
HUD
had
attr_accessor :active
exactly for this reason, but we need to switch it on and off in
PlayState#enter
and
PlayState#leave
.
class
PlayState
<
GameState
# ...
def
button_down
(
id
)
# ...
if
id
==
Gosu
::
KbEscape
pause
=
PauseState
.
instance
pause
.
play_state
=
self
