private void UpdateHandleTip(LinearHandleEventData eventData)
{
if (m_HandleTip != null)
{
m_HandleTip.gameObject.SetActive(m_HoverSources.Count > 0 || m_DragSources.Count > 0);
if (m_HoverSources.Count > 0 || m_DragSources.Count > 0) // Reposition handle tip based on current raycast position when hovering or dragging
{
if (eventData != null)
{
m_HandleTip.position =
transform.TransformPoint(new Vector3(0, 0,
transform.InverseTransformPoint(eventData.raycastHitWorldPosition).z));
}
}
}
}
void UpdateEventData(LinearHandleEventData eventData, bool setLastPosition = true)
{
var rayOrigin = eventData.rayOrigin;
var lastPosition = m_LastPositions[rayOrigin];
var worldPosition = lastPosition;
var thisTransform = transform;
if (m_OrientDragPlaneToRay)
{
// Orient a plane through the axis.
// To avoid the plane being at a glancing angle from the ray, extend the plane perpendicular to the direction towards the ray origin.
var rotation = thisTransform.rotation;
var position = thisTransform.position;
var forward = Quaternion.Inverse(rotation) * (rayOrigin.position - position);
forward.z = 0;
m_Plane.SetNormalAndPosition(rotation * forward.normalized, position);
}
else
{
// Orient the plane with the handle's XZ axis, do not account for the direction the ray is starting from
m_Plane.SetNormalAndPosition(thisTransform.up, thisTransform.position);
}
float distance;
var ray = eventData.GetRay();
if (m_Plane.Raycast(ray, out distance))
{
worldPosition = ray.GetPoint(Mathf.Min(distance, HandleSettings.instance.MaxDragDistance * this.GetViewerScale()));
}
eventData.raycastHitWorldPosition = worldPosition;
eventData.deltaPosition = Vector3.Project(worldPosition - lastPosition, thisTransform.forward);
if (setLastPosition)
{
m_LastPositions[rayOrigin] = worldPosition;
}
}
void UpdateEventData(LinearHandleEventData eventData, bool setLastPosition = true)
{
var rayOrigin = eventData.rayOrigin;
var lastPosition = m_LastPositions[rayOrigin];
var worldPosition = lastPosition;
var thisTransform = transform;
if (m_OrientDragPlaneToRay)
{
// Orient a plane for dragging purposes through the axis that rotates to avoid being parallel to the ray,
// so that you can prevent intersections at infinity
var rotation = thisTransform.rotation;
var position = thisTransform.position;
var forward = Quaternion.Inverse(rotation) * (rayOrigin.position - position);
forward.z = 0;
m_Plane.SetNormalAndPosition(rotation * forward.normalized, position);
}
else
{
m_Plane.SetNormalAndPosition(thisTransform.up, thisTransform.position);
}
float distance;
var ray = eventData.GetRay();
if (m_Plane.Raycast(ray, out distance))
{
worldPosition = ray.GetPoint(Mathf.Min(distance, k_MaxDragDistance * this.GetViewerScale()));
}
eventData.raycastHitWorldPosition = worldPosition;
eventData.deltaPosition = Vector3.Project(worldPosition - lastPosition, thisTransform.forward);
if (setLastPosition)
{
m_LastPositions[rayOrigin] = worldPosition;
}
}