HTML and CSS Reference
In-Depth Information
}
iif
(
keyPressList
[
37
]
==
true
true
) {
//rotate counterclockwise
rotation
-=
rotationalVelocity
;
}
iif
(
keyPressList
[
39
]
==
true
true
) {
//rotate clockwise
rotation
+=
rotationalVelocity
;;
}
Let's add this code to our current set of rotation examples and test it out. We have made some
major changes, so
Example 8-8
presents the entire HTML file once again.
Example 8-8. Controlling the player ship
<!doctype html>
<html
<html lang=
"en"
>
<head>
<head>
<meta
<meta charset=
"UTF-8"
>
<title>
<title>
CH8EX8: Ship Turn With Keys
</title>
</title>
<
script type
=
"text/javascript"
>
window
.
addEventListener
(
'load'
,
eventWindowLoaded
,
false
false
);
function
function
eventWindowLoaded
() {
canvasApp
();
}
function
function
canvasApp
(){
var
var
theCanvas
=
document
.
getElementById
(
"canvas"
);
iif
(
!
theCanvas
|| !
theCanvas
.
getContext
) {
return
return
;
}
var
var
context
=
theCanvas
.
getContext
(
"2d"
);
iif
(
!
context
) {
return
return
;
}
//canvasApp level variables
var
var
rotation
=
0
;
var
var
x
=
50
;
