Game Development Reference
In-Depth Information
A Boolean (true/false) value to indicate whether or not the
BitmapData
will use
transparency
A color represented as an unsigned integer (
uint
).
A completely transparent background can be set for a screen by passing in true for
the
isTransparent
parameter and a 32-bit color value with an alpha channel set to
00
. Colors are
represented as
AARRBBGG
where the alpha (
AA
) values ranging from
0x00
(
0
) (completely
transparent) to
0xFF
(
255
) (completely opaque) can be passed in.
The
init
function is used to set up the field for the display text (
displayText
) and the OK button
(
okButtonSprite
). The OK button is added only if the passed in
okNeeded
is set to
true
.
The first actual line of code might be a little cryptic:
textformat1.align = flash.text.textFormayAlign.CENTER
When we set up the
textFormat1
variable, we didn't set the alignment to center because not all
uses of it will be centered. We can change the alignment on the fly, and we do so here before we
apply it to the
displayText
field as its
defaultTextFormat
. Then, we simply add the text to the
screen. In the first
init
call, there is no text to actually add to the screen. It is added with the
setDisplytext
function described next. The
setDisplayText
function is public and is called by the
Main
class when the
BasicScreen
instances (title, instruction, game over, and so on) are placed
on the display list. This allows the text for the screen to be customized for each showing.
The createDisplayText function definition
By calling the
createDisplayText
function on a
BasicScreen
instance, we can turn on and set the
default location and text value for the text that displays on the
BasicScreen
instance. The function
adds the
defaultText
to the
displayList
with the
addChild
function call. The game screen is
shown in Figure 2-1.
The parameters passed into this function follow:
text
: The actual text to put in the
.text
attribute of the
defaultText TextField
location
: A
Point
class instance that will be used to define the
x
and
y
values of the
upper left-hand corner for the
defualtText TextField
width
: The width in pixels of the
defaultText TextField
textFormat
: A
TextFormat
instance used to format the text in the
defaultText
TextField
