How can I colour my delaunay triangulation based on concentration of some property?

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Mark 2015-12-8

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评论： Mark 2015-12-12

I have a delaunay triangulation and I would like to display the increasing concentration of a property through the cells of the triangulation using the increasing intensity of a specified colour.

Please can anyone help with how to do this?

Thank you,

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Mark 2015-12-10

Please can anyone help with this???

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回答（1 个）

Walter Roberson 2015-12-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/259416-how-can-i-colour-my-delaunay-triangulation-based-on-concentration-of-some-property#answer_202799

在 MATLAB Online 中打开

One way:

http://www.mathworks.com/help/matlab/math/interpolation-using-a-specific-delaunay-triangulation.html#btt8sdl

and http://www.mathworks.com/help/matlab/math/interpolating-scattered-data.html

Another way: http://www.mathworks.com/help/matlab/ref/triscatteredinterp.html

That is, use your triangulation to interpolate the value at a set of points.

Once you have the value, to express intensity of the color, use

target_color = [240, 18, 152];   %for example
cmap = linspace(0,1,256).' * target_color;   %matrix multiply

and define the intensity that is to map to the bottom and the intensity that is to map to the top:

minintens = -85.32;     %whatever appropriate
maxintens = 148139.2;   %whatever appropriate

and now that you have the map, graph the intensity such as with

   image(ArrayOfIntensities, [minintens, maxintens]);
   colormap(cmap);

I used delaunayTriangulation() method, and I need it to work now to start with and then I can figure out later how to make it work for the longer term. Yes the delaunay triangulation method makes it easy for me to incorporate my fracture elements into the simulation domain. Plus my code is complete using the delaunayTriangulation() method, I just now need to visually display how the concentration of water propagates through by changing color intensity.

Mark 2015-12-12