HTML and CSS Reference
In-Depth Information
newParticle
=
particlePool
.
pop
();
newParticle
.
dx
=
Math
.
random
()
*
3
;
iif
(
Math
.
random
()
<
.
5
){
newParticle
.
dx
*=
−
1
;
}
newParticle
.
dy
=
Math
.
random
()
*
3
;
iif
(
Math
.
random
()
<
.
5
){
newParticle
.
dy
*=
−
1
;
}
newParticle
.
life
=
Math
.
floor
(
Math
.
random
()
*
30
+
30
);
newParticle
.
lifeCtr
=
0
;
newParticle
.
x
=
x
;
newParticle
.
width
=
2
;
newParticle
.
height
=
2
;
newParticle
.
y
=
y
;
newParticle
.
type
=
type
;
//ConsoleLog.log("newParticle.life=" + newParticle.life);
particles
.
push
(
newParticle
);
}
}
}
As the
particle
objects are created in
createExplode()
, we add a new
type
attribute to
them. When an explosion is triggered in the
checkCollisions()
function, the call to
cre-
ateExplode()
nowincludesthis
type
valuebasedontheobjectthatwasdestroyed.Eachrock
already has a
scale
parameter that varies from
1
to
3
based on its size. We use those as our
base
type
valuetopassinfortherocks.Nowweonlyneed
type
valuesfortheplayerandthe
saucer. For the saucer, we use
0
, and for the player, we use
4
. We pulled these id values out of
the air. We very well could have used
99
for the saucer and
200
for the player. We just could
not use
1
,
2
, or
3
because those values are used for the rocks. The
type
breakdown looks like
this:
▪ Saucer:
type
=
0
▪ Large rock:
type
=
1
▪ Medium rock:
type
=
2
▪ Small rock:
type
=
3
▪ Player:
type
=
4
