Game Development Reference
In-Depth Information
68
self
,
UNIT_FILE
,
:precise
)
69
@tank
=
Tank
.
new(
self
,
70
@units
.
frame(
'tank1_body.png'
),
71
@units
.
frame(
'tank1_body_shadow.png'
),
72
@units
.
frame(
'tank1_dualgun.png'
))
73
@x
=
@y
= 0
74
@first_render
=
true
75
@buttons_down
= 0
76
end
77
78
def
needs_cursor?
79
true
80
end
81
82
def
button_down
(
id
)
83
close
if
id
==
Gosu
::
KbEscape
84
@buttons_down
+= 1
85
end
86
87
def
button_up
(
id
)
88
@buttons_down
-= 1
89
end
90
91
def
update
92
@x
-=
SPEED
if
button_down?(
Gosu
::
KbA
)
@x
+=
SPEED
if
button_down?(
Gosu
::
KbD
)
93
@y
-=
SPEED
if
button_down?(
Gosu
::
KbW
)
94
@y
+=
SPEED
if
button_down?(
Gosu
::
KbS
)
95
@tank
.
update
96
self
.
caption
=
"
#{
Gosu
.
fps
}
FPS. "
<<
97
'Use WASD and mouse to control tank'
98
99
end
100
101
def
draw
102
@first_render
=
false
103
@map
.
draw(
@x
,
@y
)
104
@tank
.
draw()
105
end
106
end
107
108
GameWindow
.
new
.
show
Tank sprite is rendered in the middle of screen. It consists of three layers, body shadow,
body and gun. Body and it's shadow are always rendered in same angle, one on top of
another. The angle is determined by keys that are pressed. It supports 8 directions.
