/// <summary>
/// Global static helper method for finding the position
/// of the mouse on a canvas in any rendering mode.
/// </summary>
/// <remarks>Note that in world-rendering mode the position
/// of the mouse is projected to the canvas so the resulting
/// Vector2 may appear slightly offset in some cases if the
/// z-axis is not flattended.</remarks>
/// <returns>The projected mouse position on canvas.</returns>
/// <param name="canvas">The canvas to find the mouse position on.</param>
public static Vector3 GetPointerPosOnCanvas(Canvas canvas, Vector2 pointerPos)
{
if (canvas.renderMode == RenderMode.ScreenSpaceCamera)
{
Vector2 pos;
RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas.transform as RectTransform, pointerPos, canvas.worldCamera, out pos);
return(canvas.transform.TransformPoint(pos));
}
else if (canvas.renderMode == RenderMode.ScreenSpaceOverlay)
{
return(PointerUtility.GetPosition());
}
else
{
Vector3 globalMousePos;
if (RectTransformUtility.ScreenPointToWorldPointInRectangle(canvas.transform as RectTransform, PointerUtility.GetPosition(), canvas.worldCamera, out globalMousePos))
{
return(globalMousePos);
}
};
return(Vector2.zero);
}
void Update()
{
transform.position = GetPointerPosOnCanvas(Canvas, PointerUtility.GetPosition());
}