Game Development Reference
In-Depth Information
10
def
initialize
(object_pool, target)
11
@object_pool
=
object_pool
12
@target
=
target
13
@last_update
= 0
14
end
15
16
def
update
17
if
Gosu
.
milliseconds
-
@last_update
>
UPDATE_FREQUENCY
18
@nearby
=
nil
19
end
20
@nearby
||=
@object_pool
.
nearby(
@target
,
2000
)
.
select
do
|
o
|
21
o
.
class
==
Tank
&& !
o
.
health
.
dead?
22
end
23
end
24
25
def
draw
26
x1, x2, y1, y2
=
radar_coords
27
$window
.
draw_quad(
28
x1, y1,
BACKGROUND
,
29
x2, y1,
BACKGROUND
,
30
x2, y2,
BACKGROUND
,
31
x1, y2,
BACKGROUND
,
32
200
)
33
draw_tank(
@target
,
Gosu
::
Color
::
GREEN
)
34
@nearby
&&
@nearby
.
each
do
|
t
|
35
draw_tank(t,
Gosu
::
Color
::
RED
)
36
end
37
end
38
39
private
40
41
def
draw_tank
(tank, color)
42
x1, x2, y1, y2
=
radar_coords
43
tx
=
x1
+
WIDTH
/ 2 +
(tank
.
x
-
@target
.
x)
/ 20
44
ty
=
y1
+
HEIGHT
/ 2 +
(tank
.
y
-
@target
.
y)
/ 20
45
if
(x1
.
.x2)
.
include?(tx)
&&
(y1
.
.y2)
.
include?(ty)
46
$window
.
draw_quad(
tx
- 2
, ty
- 2
, color,
47
tx
+ 2
, ty
- 2
, color,
48
tx
+ 2
, ty
+ 2
, color,
49
tx
- 2
, ty
+ 2
, color,
50
300
)
51
52
end
53
end
54
55
def
radar_coords
