how i can move an circle diagonal direction??

I have an image that contains a circle with a certine raduis , and i wanted to move it in a diagonal direction with 45 degree.what a new m,n should i do??

this is a code for an image:

s1=350;

s2=350;

ImageOrg1=zeros(s1,s2); %Image creation with [x by y] pixels

ImageOrg_sh=zeros(s1,s2);

rad= s1/30;

for m=1:s1

for n=1:s2

Di1=sqrt((m-s1/2)^2+(n-s2/2)^2);

if (Di1<=rad)

ImageOrg1(m,n)=1;

m_new=

n_new=

ImageOrg_sh(m_new,n_new)=1;

end

end

end

figure;imagesc(ImageOrg1); colormap gray; axis square

figure;imagesc(ImageOrg_sh); colormap gray; axis square