MATLAB: How to create an x by y grid and how to color each grid section

game boardgrid patternstratego

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

Best Answer

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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MATLAB: How place the tick at the mid value of specific color range and uniform color bar across different ranges of data

I'll start a new anwer using a different approach. This time we'll manually define everything - no shortcuts. That should allow you more control over what is going on, making it easier for you to adapt.

Going back to your original question:

0-10 = red, tick at 5
11-20 = blue, tick at 15
etc.

First, create a custom colormap, manually specifying the colors and the range they apply to. Note that the ranges aren't equal (one has 5 in it). Not sure why 0-10 is 10 and not 11, but hey, it's working.

% Create custom colormap
cmap = [repmat([1 0 0],10,1)     % >=0 & <=10 (red)
    repmat([0 0 1],10,1)         % >10 & <=20 (blue)
    repmat([0 1 0],10,1)         % >20 & <=30 (green)
    repmat([1 1 0],5,1)];        % >30 & <=35 (yellow)

If you want more colors, add them to cmap. Just adjust the pattern to match the ranges you specify.

With that defined, plot your data. Then set the colormap, caxis limits, and ticks as follows:

colormap(cmap)
h=colorbar;
caxis([0 35])
set(h,'Ticks',[5 15 25 32.5])

Set the ticks to whatever you want to use. It will by default use its value as the label.

If you want the tick label to be different from the tick value, set the tick label property as well. For example, if I wanted the label to display in the middle of the range but show the max value of the range, I'd do this instead:

set(h,'Ticks',[5 15 25 32.5],'TickLabels',num2str([10; 20; 30; 35]))

MATLAB: How to create a rectangular piece image that can be positioned on a game board

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.

Best Answer

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MATLAB: How place the tick at the mid value of specific color range and uniform color bar across different ranges of data

MATLAB: How to create a rectangular piece image that can be positioned on a game board

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