public void Update(FrameTime frameTime)
{
if (isComplete)
{
return;
}
time += frameTime.DeltaSeconds;
if (!storyPath.HasFinished)
{
storyPath.Update(frameTime);
completeTime = Math.Max(1f, time + storyPath.MaxRemainingTime);
}
visualProps = storyPath.GetCurrentCameraProps();
var acceleratingTime = MathHelper.Clamp(completeTime, 0f, 1f);
if (time < acceleratingTime)
{
visualProps = CameraProps.Lerp(initialCameraProps, visualProps, time / acceleratingTime);
}
var actualFinalCameraProps = finalCameraProps ?? storyPath.GetCurrentCameraProps();
var brakingTime = MathHelper.Clamp(completeTime - acceleratingTime, 0f, 1f);
var remainingTime = brakingTime + completeTime - time;
if (remainingTime < brakingTime)
{
visualProps = CameraProps.Lerp(visualProps, actualFinalCameraProps, (brakingTime - remainingTime) / brakingTime);
}
if (remainingTime < 0)
{
visualProps = actualFinalCameraProps;
onComplete();
isComplete = true;
}
}
private CameraProps GetCameraAt(float timestamp)
{
var amount = GetLerpAmount(timestamp);
return(CameraProps.Lerp(StartCameraProps, EndCameraProps, amount));
}