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How to draw line with setting color for every point

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john_arle
john_arle on 6 Nov 2019
Commented: Walter Roberson on 6 Nov 2019
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

  3 Comments

Walter Roberson
Walter Roberson on 6 Nov 2019
Experiment by replacing the word 'CData' with the point size.
john_arle
john_arle on 6 Nov 2019
I have already tried! Sorry I had not edited the question in time!
Walter Roberson
Walter Roberson on 6 Nov 2019
Try dbstop if warning and examine the sizes of all of the parameters.

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