How do I create an x by y grid and how do I color each grid section?

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Ryan Burrows
Ryan Burrows 2018-10-26
评论： Walter Roberson 2018-10-27
I am currently creating the game stratego on matlab. I am not sure how to physically create the game board though. I am looking for something quite simple, just a grid pattern where I can manually color each square whatever color I want. Please help
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jonas
jonas 2018-10-27
编辑：jonas 2018-10-27
Well you understood how this works much faster than most people do. The only thing I forgot to mention is that the colorscale scales automatically, meaning that the max/min in your matrix become the the top/bottom colors of your colorbar. You need to set the CLim so that the max/min stays at [0 4], even if those numbers are not present in your matrix.
A = repmat([repmat([1 0],1,10);repmat([0 1],1,10)],10,1)
set(gca,'clim',[0 4])
A(10,10)=3;
h = pcolor(A)
cmap = [0 0 0;1 1 1;1 0 0;0 0 1;0 1 0];
colormap(cmap)
set(gca,'clim',[0 4])
In addition, something you will probably find useful is that you can change the colors after plotting by this simple syntax
h.CData(2,4) = 3
assuming the handle to your pcolor is called h. This will be useful for you when you move your pieces over the board. You can write a callback function for that.
Walter Roberson
Walter Roberson 2018-10-27
pcolor() is really surf() followed by view(2).
pcolor() interpolates face colors according to the surrounding four nodes.
If you want face colors directly you should be using imagesc()

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jonas
jonas 2018-10-26
编辑：jonas 2018-10-26
You could use pcolor, here's a checkerboard example
A = repmat([repmat([1 0],1,10);repmat([0 1],1,10)],10,1)
pcolor(A)
You can build a color palette like this
cmap = [0 0 0;1 1 1;1 0 0;0 0 1;0 1 0];
colormap(cmap)
Now you can paint with these colors, by assigning values between, for example, 0 and 4 (you have 5 colors).
A(10,10)=4;
Makes the square at [10;10] green

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