Gradient coloring of streamlines

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Hello,
I'm currently using the streamline function https://fr.mathworks.com/help/matlab/ref/streamline.html to plot the streamlines of a flow I'm considering. I would like to have an "evoluting" color along the streamlines according to the flow speed in each point.
I don't know how to start ... Any hint will be very appreciated ! Here is my code that is ploting the streamlines :
%%%%%%%%%%%%%%%%%Shear over topo
alpha = 70 ;
lambda = 20 ;
k = cosd(alpha) * 2 *pi/lambda ;
l = sind(alpha) * 2 *pi/lambda ;
x = 0 : 0.1 : 50 ;
y = 0 : 0.1 :50 ;
A = 1;
B = 3 ;
Amp = 0.1/sqrt(k^2+l^2) ;
[X,Y] = meshgrid(x,y) ;
TauX = Amp * sqrt(A^2+B^2)*(k^2/sqrt(k^2+l^2)).*cos(k.*X+l.*Y + atan(B/A)) ;
TauY = Amp * sqrt(A^2+B^2)*(k*l/sqrt(k^2+l^2)).*cos(k.*X+l.*Y + atan(B/A)) ;
Topo = Amp .* cos(k.*X + l.*Y) ;
figure
imagesc(x,y,Topo)
hold on
hlines = streamline(X(1:step:end,1:step:end),Y(1:step:end,1:step:end),1 + TauX(1:step:end,1:step:end), TauY(1:step:end,1:step:end),0*y(1:step:end,1:step:end),y(1:step:end,1:step:end)) ;
set(hlines, 'Color', 'k')
Thank you very much !

回答(1 个)

Manish Annappa
Manish Annappa 2017-7-12
As per your description, you either want to set different colors to each line in variable 'hlines' or you want to set multiple colors to a single line (varying colors along Y axis).
1) You can set different colors to each line using the code snippet below.
colorstring = 'kbgry';
for i = 1:5
set(hlines(i), 'Color', colorstring(i))
end
2) As per the link below, it is not possible to set different colors for different region of a line.
However, below link that illustrates the usage of patch objects may help you.

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