Setting colormap to lines from streamslice

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Aatresh Karnam 2024-1-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2072631-setting-colormap-to-lines-from-streamslice

评论： Aatresh Karnam 2024-1-24

采纳的回答： Taylor

在 MATLAB Online 中打开

Hi all,

I am trying to apply a colormap to a set of lines generated via streamslice.

The general approach seems to be to set all the lines to a single color through the following method:

h = streamslice(X,Y,Z,uData,vData,zData,[],[],[],5);
set(h,'Color','k');

All the streamlines are grouped in h and share the Primitive Line charateristics, hence the colormap property does not apply to them.

I have tried setting the colormap to the axis Color Order parameter before generating the streamlines but that seems to get overwitten by the default color order once I plot the streamlines. Although I use a 256 x 3 color space, the number of streamlines that are generated far exceeds this which means I cannot assign an individual color to each of the lines in h.

For context, the end result I wanted to achieve is something along the lines of the image below. Any help would be appreciated. Thanks a lot

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vidyesh 2024-1-22

MATLAB uses Hexadecimal Color Code which has 16,777,216 (256 x 256 x 256) possible colors.

Do the number of lines exceed this?

Aatresh Karnam 2024-1-23

编辑：Aatresh Karnam 2024-1-23

My colormap is defined as an RGB triplet in 256 format (256 x 3) instead of the regular 64 x 3 colormap format. The number of lines can easily exceed that limit since for streamslice the colors are set on a per line basis from what I can see in the help section and in the few queries on the forum.

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Answer 1

Taylor 2024-1-23

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https://ww2.mathworks.cn/matlabcentral/answers/2072631-setting-colormap-to-lines-from-streamslice#answer_1395826

在 MATLAB Online 中打开

You could just randomly generate the colors:

load wind

lineObj = streamslice(x,y,z,u,v,w,[],[],5,'noarrows');

for ii = 1:length(lineObj)

lineObj(ii).Color = [rand(1) rand(1) rand(1)];

end

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Aatresh Karnam 2024-1-24

I guess this will have to do for now, thanks Taylor. I might try interpolating across my custom colormap using interp1 to add in points to match the line family from streamslice. It would have been easier if the custom colormap assigned to the axis ColorOrder was not overwritten when plotting streamlines. That way the colors would keep cycling through the colormap and generate a repeating pattern.

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