I would just use textboxes. For example:
A = repmat([repmat([1 0],1,5);repmat([0 1],1,5)],5,1)
cmap = [0 0 0;1 1 1;1 0 0;0 0 1;0 1 0];
colormap(cmap)
A(10,10)=4;
pcolor(A)
p(1) = annotation('textbox',[norm2ax(1,1) 0.05 0.05],...
'string','A',...
'backgroundcolor','b',...
'color','w',...
'horizontalalignment','center',...
'verticalalignment','middle')
function out = norm2ax(Xa,Ya)
ax = gca;
Xn = ax.Position(1) + (Xa-ax.XLim(1)) .* ax.Position(3)/(diff(ax.XLim));
Yn = ax.Position(2) + (Ya-ax.YLim(1)) .* ax.Position(4)/(diff(ax.YLim));
out = [Xn,Yn];
end
The input to the custom function "norm2ax" is the location of your piece. To change the location after creating it. Just Change the position property of p(1).
Disclaimer: have never played stretego.
