Drawing colored line segments in a 3d plot

Question

Harry 2020-7-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/564323-drawing-colored-line-segments-in-a-3d-plot

回答： Image Analyst 2020-7-13

I have code that produces quite nice looking 3d graphs showing line segments.

Currently, i can make the points at the end of each line segment match each other- but i can't work out how to make the line segment match the points at its ends.

A = rand(6,50);
%create 3d points to be graphed 
startv = [A(:,1),A(:,3),zeros(length(A),1)];
endv = [A(:,2),A(:,5),A(:,4)];
%I want to use the vector endv to determine the colour of the lines/points
%to make the graph clearer; so i am going to create a color vector by
%transforming it
colorv=endv./max(endv)
figure;hold on
scatter3(startv(:,1),startv(:,2),startv(:,3),10,colorv,'filled');
scatter3(endv(:,1),endv(:,2),endv(:,3),10,colorv,'filled');
h = plot3([startv(:,1)';endv(:,1)'],...
    [startv(:,2)';endv(:,2)'],...
    [startv(:,3)';endv(:,3)'])
set(h,'color',[128,0,128]./255);

this graph illustrates the above; in this case some data is being displayed (and this means one variable is always close to 100), but i think it would be easier to understand if the lines were the same colour as their ends

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Answer 1

Image Analyst 2020-7-13

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/564323-drawing-colored-line-segments-in-a-3d-plot#answer_465182

在 MATLAB Online 中打开

If you call plot3 in a loop, you can plot one line at a time with colorv. Something like (untested)

for k = 1 : size(startv, 1)
    plot3([startv(k,1)';endv(k,1)'],...
        [startv(k,2)';endv(k,2)'],...
        [startv(k,3)';endv(k,3)'], '.-',...
        'LineWidth', 2, 'Color', colorv(k,:), 'MarkerSize', 30);
end