I have the screen for different users like this:
In each screen there are small boxes each for a user. I have calculated width and height of each small box for different number users.
But now I am not getting how to get the coordinates of the boxes(top left point of the box).
The coordinate system starts from top-left of the screen that is the top left of the screen has coordinates as (0,0)
Can someone please help me out in this.
Sorry, my image is not displaying. I think it is because I dont have enought reps
Let's assume that we know the dimensions of the large screen (width $W$, height $H$) and how many smaller screens there are in each direction (for example, for two users, we have a $2 \times 1$-grid). Let the number of screens in the $x$-direction be $n$ and the number of screens in the $y$-direction be $m$. So these are all the numbers that we know in the beginning.
The next step is to realize that the coordinates of the top-left corner of each of the smaller screens are multiples of $\frac{W}{n}$ and $\frac{H}{m}$. In other words, there are integers $a$ and $b$ so that the coordinates for each of these points is of the form $$ (x,y) = \left(a\cdot \frac{W}{n} ,~ b\cdot \frac{H}{m}\right) $$ The next question is, what are these multipliers $a$ and $b$ ? We can take a test case and just see if we see a pattern. Let's assume that we have eight users and then $n=m=3$. Then, for each of the users (we start numerating the user number $u$ from 0, so the "first" user has $u=0$), the multipliers are the following:
Can you see the pattern here? It's really easy to see that, for the "$u+1$":th user, $$ \begin{cases} a = u \mod n \\ b = \lfloor \frac{u}{n} \rfloor \end{cases} $$ Here, $\text{mod}$ refers to taking the remainder in division, and $\lfloor ... \rfloor$ is the floor function. I think we're done here.