public void Update(float elapsedTime)
{
if (!Running)
{
return;
}
_currentTime += elapsedTime;
if (_currentTime >= _currentStep.Duration)
{
_currentTime -= _currentStep.Duration;
if (_workItems.Count == 0)
{
if (_looping)
{
_workItems = new Queue <StoryboardStep <T> >(_steps);
}
else
{
Running = false;
}
}
else
{
_currentStep = _workItems.Dequeue();
}
}
_currentValue = GetValue(_currentTime, _currentStep);
}
public void Begin(bool looping)
{
_looping = looping;
_workItems = new Queue <StoryboardStep <T> >(_steps);
_currentStep = _workItems.Dequeue();
_currentTime = 0;
_currentValue = GetValue(_currentTime, _currentStep);
Running = true;
}
protected abstract T GetValue(float elapsedTime, StoryboardStep <T> step);
protected override Vector2 GetValue(float elapsedTime, StoryboardStep <Vector2> step)
{
return(new Vector2(MathHelper.Lerp(step.StartValue.X, step.TargetValue.X, elapsedTime / step.Duration),
MathHelper.Lerp(step.StartValue.Y, step.TargetValue.Y, elapsedTime / step.Duration)));
}
protected override float GetValue(float elapsedTime, StoryboardStep <float> step)
{
return(MathHelper.Lerp(step.StartValue, step.TargetValue, elapsedTime / step.Duration));
}