codobro,

Thank you very much for your kind reply.
I will not post the same question again from now on.
I apprciate your suggestion.
In this connection, I understand that upper left position is (0,0) , then　What is the indication of lower right at that time?
For example, can I use (250,350) for lower right indication when upper left position is (0,0) ?

I thank you in advance for your kindest understanding of the above.