public void SetState(string state)
{
Validate();
AnimationState tmp = GetState(state);
if (tmp == null)
throw new AnimationOperationException("Bad animation state : " + state);
else
{
_currentState = tmp;
_tick = 0;
_currentFrame = 0;
_frameHasChanged = true;
}
}
public void Update(int elapsed)
{
Validate();
_tick += elapsed;
if (_tick >= _currentState.switchdelay)
{
_currentFrame++;
if (_currentFrame >= _currentState.framecount)
{
_currentFrame = 0;
if (!_currentState.IsLooped())
_currentState = GetState(_currentState.nextstate);
}
_frameHasChanged = true;
_tick = 0;
}
}
private void Validate()
{
if (_hasBeenValidated)
return;
bool hasNormal = false;
int y_offset = 0;
foreach (AnimationState st in states)
{
if (st.name == "normal")
hasNormal = true;
if (GetState(st.nextstate) == null)
throw new AnimationOperationException("The next state " + st.nextstate + " of " + st.name + " has not been defined");
if (st.framecount <= 0)
throw new AnimationOperationException("Invalid frame count on state " + st.name);
if (st.switchdelay < 0)
throw new AnimationOperationException("Invalid switch delay on state " + st.name);
if (st.height < 0)
throw new AnimationOperationException("Invalid height on state " + st.name);
if (st.width < 0)
throw new AnimationOperationException("Invalid width on state " + st.name);
st.SetYOffset(y_offset);
y_offset += st.height;
}
if (!hasNormal)
throw new AnimationOperationException("The spritesheet requires the animation state 'normal'");
_currentState = GetState("normal");
_hasBeenValidated = true;
}
