public void CopyFrom(TouchCluster other)
{
Clear();
foreach (var entry in other.Touches)
{
Touches.Add(entry.Key, entry.Value);
}
ActiveTouchId = other.ActiveTouchId;
Centroid = other.Centroid;
ClusterId = other.ClusterId;
}
public bool GetTouchCluster(TouchCluster cluster)
{
cluster.Clear();
if (Root == null)
{
return(false);
}
CollectTouchesInTree(Root, cluster);
cluster.SetActiveTouch(_touchPoints[ActiveTouchIndex]);
cluster.ClusterId = ClusterId;
return(true);
}
/// <summary>
/// This method updates the positions of the TouchPts in this TouchCluster
/// to account for translation of the entire cluster by comparing the centroid positions.
/// This makes analysis of the relative touch positions (rotation, pinch) easier by removing
/// the common translation. It also helps identify a pinch or rotation where a single touch
/// is moving, or where the touches are moving by different amounts.
/// </summary>
/// <param name="newPosition"></param>
/// <returns></returns>
public bool NormalizeForCentroidDelta(TouchCluster newPosition)
{
// Update positions of touches by the amount necessary to align the Centroid to the new Centroid position
Vector2 delta = newPosition.Centroid - Centroid;
if (delta == Vector2.zero)
{
return(false);
}
foreach (int key in Touches.Keys.ToList())
{
var touch = Touches[key];
touch.position += delta;
Touches[key] = touch;
}
return(true);
}
