How can I create interactive board?

Question

Rex Onious 2020-3-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513224-how-can-i-create-interactive-board

回答： Tommy 2020-3-27

I have been trying to create interactive board. I want it to change color when I click on it so I can for example write stuff on it. Lets say I have board of 5x5 and click on its pools to write an A. I have been searching for answer to my question in in internet but I was unable to find anything about such thing all I could find is how to make a checkerboard but not how to make empty board that changes colors on click. Can you please give me some information about it and maybe place where I can read how to do this? Here is the board I was able to create:

colors = [0 0 0; 1 1 1];
inds = 1:25;
color_inds = 1+mod(inds,2);
r = colors(color_inds,1);
g = colors(color_inds,2);
b = colors(color_inds,3);
checkers = cat(2,r,g,b);
checkers = reshape(checkers,[5,5,3]);
imagesc(checkers);
axis equal tight;

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Answer 1

Tommy 2020-3-27

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https://ww2.mathworks.cn/matlabcentral/answers/513224-how-can-i-create-interactive-board#answer_422222

在 MATLAB Online 中打开

It sounds like you want to add a mouse-click callback to your image, which is a function that gets called whenever you click inside the image:

colors = [0 0 0; 1 1 1];
inds = 1:25;
color_inds = 1+mod(inds,2);
r = colors(color_inds,1);
g = colors(color_inds,2);
b = colors(color_inds,3);
checkers = cat(2,r,g,b);
checkers = reshape(checkers,[5,5,3]);
im = imagesc(checkers); % Store the image
axis equal tight;
im.ButtonDownFcn = @clickCallback; % Add the callback
function clickCallback(src, event)
    pos = get(gca,'CurrentPoint'); % You can obtain the coordinates of the click like this
    disp(pos)
end