showimg.m

function h=showimg(x,y,A)
% Display an image
%
% Usage h=showimg(x,y,A)
%
% Very similar to imshow, but makes it easier to pass pixel coordinates.
%
% Example usage:
%   A = imread('cameraman.tif');
%   A(1,1,3)=0; %set the green and blue channels to all zeros. 
%   x = (1:size(A,2))*10+100;
%   y = (size(A,1):-1:1)*10+100;
%   showimg(x,y,A);
%   axis on
% 
% Aslak Grinsted 2016

if nargin==1
    A=x;
    x=1:size(A,2);
    y=1:size(A,1);
end

if ~isa(A,'uint8')
    A=A-min(A(:));
    A=uint8(A*255.49./max(A(:)));
end
if size(A,3)==1
    A=repmat(A,[1 1 3]); %this is to ensure that it does not interfere with CAXIS.
end

h=image(A,'XData',x,'YData',y,'CDataMapping','scaled'); %the cdatamapping is a workaround for a bug in R2014+
axis equal tight xy off
if nargin==1
    axis ij
end
if nargout==0
    clearvars h
end