/// <summary>
/// Checks the current grabbing gesture and tries to grab/release/approach a grabbable.
/// This key method triggers the callbacks for the snapping system.
/// </summary>
/// <param name="prevFlex">Last grabbing gesture strength, normalised.</param>
/// <param name="currentFlex">Current gragginb gesture strength, normalised.</param>
protected void CheckForGrabOrRelease(float prevFlex, float currentFlex)
{
if (CheckGrabFailed(currentFlex))
{
GrabFailed();
}
else if (prevFlex < GrabFlexThreshold.y &&
currentFlex >= GrabFlexThreshold.y)
{
_nearGrab = false;
GrabBegin();
}
else if (prevFlex > GrabFlexThreshold.x &&
currentFlex <= GrabFlexThreshold.x)
{
GrabEnd(true);
}
if (_autoGrabStartTime.HasValue)
{
float autoGrabProgress = (Time.timeSinceLevelLoad - _autoGrabStartTime.Value) / AUTO_GRAB_TIME;
if (autoGrabProgress < 1f)
{
OnGrabAttempt?.Invoke(_distantGrabAddress.snappable.gameObject, autoGrabProgress);
}
else
{
_nearGrab = false;
GrabBegin(_distantGrabAddress.snappable.GetComponent <Grabbable>());
}
}
else
{
if (GrabbedObject == null &&
currentFlex > 0)
{
_nearGrab = true;
NearGrab(currentFlex / GrabFlexThreshold.y);
}
else if (_nearGrab)
{
_nearGrab = false;
NearGrab(0f);
}
}
}
/// <summary>
/// Triggers how close the grabber is to start grabbing a nearby object, informing the snapping system.
/// </summary>
/// <param name="factor">Current normalised value for the grab attemp, 1 indicates a grab.</param>
protected void NearGrab(float factor)
{
if (factor == 0f)
{
OnGrabAttempt?.Invoke(null, 0f);
return;
}
Grabbable closestGrabbable = FindClosestGrabbable();
if (closestGrabbable != null)
{
OnGrabAttempt?.Invoke(closestGrabbable.gameObject, factor);
}
else
{
OnGrabAttempt?.Invoke(null, 0f);
}
}