/// <summary>
/// Called on pinch gestures
/// </summary>
protected virtual void OnPinch(PinchInfo pinch)
{
if (cameraRig != null)
{
DoPinchZoom(pinch);
}
}
/// <summary>
/// Perform a zoom with the given pinch
/// </summary>
protected void DoPinchZoom(PinchInfo pinch)
{
float currentDistance = (pinch.touch1.currentPosition - pinch.touch2.currentPosition).magnitude;
float prevDistance = (pinch.touch1.previousPosition - pinch.touch2.previousPosition).magnitude;
float zoomChange = prevDistance / currentDistance;
float prevZoomDist = cameraRig.CurrentZoomDistance;
cameraRig.SetZoom(zoomChange * cameraRig.RawCurrentZoomDistance);
// Calculate actual zoom change after clamping
zoomChange = cameraRig.CurrentZoomDistance / prevZoomDist;
// First get floor position of middle of gesture
Vector2 averageScreenPos = (pinch.touch1.currentPosition + pinch.touch2.currentPosition) * 0.5f;
Vector3 worldPos = cameraRig.GetRaycastWorldPointOnTargetSurface(averageScreenPos, Vector3.zero);
// Vector from our current look pos to this point
Vector3 offsetValue = worldPos - cameraRig.LookPosition;
// Pan towards or away from our zoom center
PanCamera(offsetValue * (1 - zoomChange));
}
