How should one create an interface for tweening something using C++? For instance, I want to fade a picture in over a duration of five seconds using a static function call like:
Graphics::FadeSurface( Surface mySurface, int FrameHeight, int NumOfFrames,
int FadeDirection, double Duration )
I have a hard-coded setup that creates an object for each tween action that needs to be performed. I have been using a DeltaTime variable that keeps track of how much time has passed since the program has launched to control logic and such. I've included an example (much less refined) to show you kind of what I'm trying to do:
Example Logic Loop:
gameLoop( double DeltaTime ){
// ...
// logic
// ...
bool isItDone = otherClass.HaveFiveSecondsElapsed( double DeltaTime );
if( isItDone == true )
exit(1);
// ...
// logic
// ...
}
Example Tweening Class:
other_Class::other_Class(){
InitialTime = 0;
InitialTime_isSet = false;
}
bool other_class::HaveFiveSecondsElapsed( double DeltaTime ){
// Setting InitialTime if it hasn't already been set
if( otherClass.InitialTime_isSet == false ){
otherClass.InitialTime = DeltaTime;
otherClass.InitialTime_isSet = true;
}
bool toReturn = false;
if( DeltaTime - InitialTime > 5 )
toReturn = true;
return toReturn;
}
Any help is greatly appreciated. Thanks!
