HTML and CSS Reference
In-Depth Information
sounds
.
push
(
tempSound
);
}
To play the sounds, we call
playSound()
, passing the proper parameters.
The call in
eventMouseUp()
looks like this:
playSound
(
SOUND_SHOOT
,.
5
);
And in
drawScreen()
, it looks like this:
playSound
(
SOUND_EXPLODE
,.
5
);
To display on the canvas how many sounds we have created, we add this code to the
drawScreen()
function:
context
.
fillStyle
=
"#FFFFFF"
;
context
.
fillText
(
"Active Sounds: "
+
sounds
.
length
,
200
,
480
);
Now,goaheadandtrythisexample(
CH7EX7.html
inthecodedistribution).
Figure 7-8
shows
what
SpaceRaiders
iteration#2lookslike.Noticethatwehaveaddedsomedisplaytextatthe
bottom ofthescreen toshowhowmanysoundsareinthesoundsarray.Youwill discover two
issues with this iteration:
1. The sounds play with almost no pauses when loaded from a local drive. But when the
page is loaded from a remote website, there is a defined pause before each sound is
loaded and played.
2. The number of
sound
objects created is a huge problem. For some browsers, such as
Chrome, the number of active sounds caps out at about 50. After that, no sounds play
at all.
