void OnMouseDown()
{
var touchPoint = Camera.main.ScreenToWorldPoint(Input.mousePosition);
var position = transform.position;
var scale = transform.lossyScale;
_beingDragged = true;
touchOffset = touchPoint - position;
lastSnap = position;
_bounds = SlidingPuzzle.CalculateSlidingBounds(position, scale);
SlidingPuzzle.RegisterObstacle(transform, true);
}
/// <summary>
/// This is where the dragging logic takes places.
/// </summary>
private void Drag()
{
var input = Camera.main.ScreenToWorldPoint(Input.mousePosition);
var scale = transform.lossyScale;
var destination = ClampPosition(input - touchOffset);
destination.z = transform.position.z;
// Now use that information to get the new bounds.
_bounds = SlidingPuzzle.CalculateSlidingBounds(lastSnap, scale);
// Simulate a snap to the grid so we can get potentially new bounds
// in the next step.
lastSnap = ClampPosition(SlidingPuzzle._grid.AlignVector3(destination, scale));
// Move to the destination!
transform.position = destination;
}