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Modeling HSV Color Space in MATLAB

I am开发者_运维知识库 able to create a 3D cone in MATLAB, but: does anyone know how to paint the cone so that it recreates the HSV color space? I know there is the command:

colormap hsv;

but how do I use it?

Thanks in advance.


I'm guessing you want to create a plot similar to the cone in the following Wikipedia image:

Modeling HSV Color Space in MATLAB

One way to do this is to plot your cone and texture map the surface with an image of the HSV color space. Here's how you could do this:

% First, create a 100-by-100 image to texture the cone with:

H = repmat(linspace(0, 1, 100), 100, 1);     % 100-by-100 hues
S = repmat([linspace(0, 1, 50) ...           % 100-by-100 saturations
            linspace(1, 0, 50)].', 1, 100);  %'
V = repmat([ones(1, 50) ...                  % 100-by-100 values
            linspace(1, 0, 50)].', 1, 100);  %'
hsvImage = cat(3, H, S, V);                  % Create an HSV image
C = hsv2rgb(hsvImage);                       % Convert it to an RGB image

% Next, create the conical surface coordinates:

theta = linspace(0, 2*pi, 100);  % Angular points
X = [zeros(1, 100); ...          % X coordinates
     cos(theta); ...
     zeros(1, 100)];
Y = [zeros(1, 100); ...          % Y coordinates
     sin(theta); ...
     zeros(1, 100)];
Z = [2.*ones(2, 100); ...        % Z coordinates
     zeros(1, 100)];

% Finally, plot the texture-mapped surface:

surf(X, Y, Z, C, 'FaceColor', 'texturemap', 'EdgeColor', 'none');
axis equal

And you should get the following figure:

Modeling HSV Color Space in MATLAB

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