/// <summary>
/// Calculate the stick's direction and magnitude
/// </summary>
/// <param name="pos">The current left touch position</param>
public void EvaluatePoint(Vector2 pos, float dt)
{
StickDirection = pos - StartLocation;
float stickLength = StickDirection.Length();
if (stickLength <= DeadZoneSize)
{
StickDirection = Vector2.Zero;
StickMagnitude = 0.0f;
}
else
{
var tmp = StickDirection;
tmp.Normalize();
StickDirection = new Vector2(tmp.X, tmp.Y * -1f);
if (stickLength < AliveZoneSize)
{
StickMagnitude = stickLength / AliveZoneSize;
StickDirection = new Vector2(StickDirection.X * StickMagnitude, StickDirection.Y * StickMagnitude);
}
else
{
StickMagnitude = 1.0f;
if (StickStyle == TouchStickStyle.FreeFollow && stickLength > AliveZoneSize * AliveZoneFollowFactor)
{
Vector2 targetLoc = new Vector2(
pos.X - StickDirection.X * AliveZoneSize * AliveZoneFollowFactor,
pos.Y + StickDirection.Y * AliveZoneSize * AliveZoneFollowFactor);
StartLocation = GetNewStartLocation(StartLocation, targetLoc, stickLength, dt);
}
}
}
}