/// <summary>
/// Animate the camera's view matrix from its current value when the activity
/// starts to the new destination matrix value.
/// </summary>
/// <param name="aCamera">The camera whose view matrix will be animated.</param>
/// <param name="aMatrix">The final matrix value.</param>
/// <param name="duration">
/// The amount of time that the animation should take.
/// </param>
/// <returns>
/// The newly scheduled activity, if the duration is greater than 0; else null.
/// </returns>
protected virtual PActivity AnimateCameraViewMatrixTo(PCamera aCamera, PMatrix aMatrix, int duration)
{
bool wasOldAnimation = false;
// first stop any old animations.
if (navigationActivity != null)
{
navigationActivity.Terminate();
wasOldAnimation = true;
}
if (duration == 0)
{
aCamera.ViewMatrix = aMatrix;
return(null);
}
PMatrix source = aCamera.ViewMatrixReference;
if (!source.MatrixReference.Equals(aMatrix.MatrixReference))
{
navigationActivity = aCamera.AnimateViewToMatrix(aMatrix, duration);
((PTransformActivity)navigationActivity).SlowInSlowOut = !wasOldAnimation;
return(navigationActivity);
}
return(null);
}