Do you have an actual .fig file, or do you just have this sketch?
Even if you have a .fig file with internal data, it may not contain all the data necessary to unambiguously reconstruct the 2D function it represents. Consider the example:
% some 2D function
x = linspace(0,2*pi,100); % uniformly-spaced xdata
y = [0 0.4 0.6 0.75 0.9 1.05 1.2].'; % arbitrarily-spaced ydata
Z = sin(x).*cos(y); % Z = f(x,y)
% this is the surf that we might want
subplot(1,2,1)
surf(x,y,Z)
% but this is the only object we have
% if this were the only thing in the .fig,
% then the ydata would be lost.
subplot(1,2,2)
plot(x,Z)
grid on
xlim([0 2*pi])
In this example, our simple line plot represents a 2D surface, but the object created by plot() does not actually contain the ydata. Unless there were a legend or something which specifies the y-position of each of these curves, we can't know what they were. There may be exceptions in cases where we know some information about the function being described, but I'm going to assume we don't.
In order to know if the question is answerable, we need to know what information is available.
