How to draw line with setting color for every point

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john_arle 2019-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/489549-how-to-draw-line-with-setting-color-for-every-point

评论： Walter Roberson 2019-11-6

hello there!

I am plotting a segment which moves in time. According to some conditions, I need the color of some point of the segment to change.

since I am redrawing the segment at every time step usign a line_handle, I need to set the color of every point of the segment at every time instant.

Then, I am shifting the vector.

To show you a simple example, I wrote a few lines (not working).

Thank you!!

In the code below, I get a warning:

'Warning: Error updating Scatter.

CData must be an RGB triplet, an M-by-1 vector of the same length as X, or an M-by-3 matrix.'

The thing is that when I run size(pe) I get 300 1,

size(color_pass) = 300 3.

So it should be correct!

for agent = 1:swarm.nb_agents
                         color_pass(1, :) = color(:, agent)';
                         for i = 2:self.wakes_length
                            color_pass(i, :) = color_pass(1, :);
                         end
                         pn = self.wakes(:, 3*(agent-1)+1);
                         pe = self.wakes(:, 3*(agent-1)+2);
                         pd = self.wakes(:, 3*(agent-1)+3);
                         hold on;
                         self.lines_handle(agent) = scatter3(...
                             pe, pn, -pd, 'SizeData', 4, 'CData', color_pass);
end