public bool Update(short timeStep = GameUtil.TimeStep)
{
var frameData = Frame;
_opacity.Set(_opacity + frameData.OpcStep(timeStep));
if (_opacity.Last() < 0f)
{
_opacity.Set(0f);
}
else if (_opacity.Last() > 255f)
{
_opacity.Set(255f);
}
_xyScale.Set(_xyScale + frameData.ScaleStep(timeStep));
if (_xyScale.Last() < 0f)
{
_opacity.Set(0f);
}
if (timeStep >= _delay)
{
var lastFrame = (short)(_frames.Count - 1);
short nextFrame;
bool endEd;
if (_zigzag && lastFrame > 0)
{
if (_frameStep == 1 && _frame.Get() == lastFrame)
{
_frameStep = (short)-_frameStep;
endEd = false;
}
else if (_frameStep == -1 && _frame.Get() == 0)
{
_frameStep = (short)-_frameStep;
endEd = true;
}
else
{
endEd = false;
}
nextFrame = (short)(_frame.Get() + _frameStep);
}
else
{
if (_frame.Get() == lastFrame)
{
nextFrame = 0;
endEd = true;
}
else
{
nextFrame = (short)(_frame.Get() + 1);
endEd = false;
}
}
var delta = (short)(timeStep - _delay);
var threshold = (float)delta / timeStep;
_frame.Next(nextFrame, threshold);
_delay = _frames[nextFrame].Delay;
if (_delay >= delta)
{
_delay -= delta;
}
_opacity.Set(_frames[nextFrame].StartOpacity);
_xyScale.Set(_frames[nextFrame].StartScale);
return(endEd);
}
else
{
_frame.Normalize();
_delay -= timeStep;
return(false);
}
}