Game Development Reference
In-Depth Information
// The frame number of the active animation
that's being displayed
int
frameNum
// Amount of time the current frame has been
displayed
float
frameTime
// The FPS the animation is running at (24FPS
by default).
float
animFPS
= 24.0f
function
Initialize(
AnimData
myData
,
int
start-
ingAnimNum
)
function
UpdateAnim(
float
deltaTime
)
function
ChangeAnim(
int
num
)
end
The
Initialize
function takes in a reference to the corresponding
AnimData
for this particular
AnimatedSprite
. By passing in a reference, an unlimited
number of animated sprites can use the same image data, which will save large
quantities of memory. Furthermore, the function requires passing in the first anim-
ation that will be played so that the remaining member variables can be initialized
by the
ChangeAnim
function.
function
AnimatedSprite
.Initialize(
AnimData
myData
,
int
startingAnimNum
)
animData
=
myData
ChangeAnim(
startingAnimNum
)
end
The
ChangeAnim
function gets called when the
AnimatedSprite
swaps to a
particular animation. It sets both the frame number and the amount of time in the
frame to zero, and sets the active image to be the first frame in the animation. In
both this function and in
UpdateAnim
, we use the
image
variable to represent
the active image. That's because the base class (
Sprite
) uses this variable to de-
termine what it should draw on a particular frame.
