How to set 'ShowArrowHead' off in the legend of a quiver plot?

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Sean
Sean 2021-6-8
评论： Sean 2021-8-3
In a quiver plot, there is a way to turn off arrow head by setting 'ShowArrowHead' off.
quiver(___,'ShowArrowHead', 'off')
However the setting is not inherent by the associated legend. How to turn off arrow head for quiver plot legend?

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回答（1 个）

Shadaab Siddiqie
Shadaab Siddiqie 2021-7-29
Ran in:
From my understanding you want to turn off the arrowhead from the quiver plot. For that you can set 'Marker' property of quiver to 'none'. Here is an example to illustrate it:
[X,Y] = meshgrid(-pi:pi/8:pi,-pi:pi/8:pi);
U = sin(Y);
V = cos(X);
q = quiver(X,Y,U,V);
q.ShowArrowHead = 'off';
q.Marker = 'none';
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Shadaab Siddiqie
Shadaab Siddiqie 2021-8-3
Ran in:
Oh you are not able to add legends on a quiver plot. There is no direct way to do so in the form of a legend. But as a workaround you can add an extra point to the data and then add a text label to the data to show as legend.
Here is an example which might help you:
% From the example, define initial quiver points
[x,y] = meshgrid(0:0.2:2,0:0.2:2);
u = cos(x).*y;
v = sin(x).*y;
% Add an additional row of points at y=2.4
[X,Y] = meshgrid(0:0.2:2, 2.4);
% Define a reference arrow velocity 1 at x=0.2 and y=2.4
u_rf=zeros(1, length(X));
v_rf=zeros(1, length(X));
u_rf(1,2)=1;
% Draw quiver plot including the new row
figure;
quiver([X;x],[Y;y],[u_rf;u],[v_rf;v]);
% Add text label to plot
text(0.05,2.5,'Arrow scale: 1m/s')
% Add bounding box if needed
rectangle('Position', [0.025, 2.3, 0.55, 0.3])
Sean
Sean 2021-8-3
Thanks for your answer. That's also my current solution that manually creates the legend.
I do have other layers of other plot features 'hold on'. So I am looking for a consistent way of generating legends for all features.
I am still looking for an automated solution given that a legend of a plot should always be updated with the plot features it represents. Apparently, it's a bug that the quiver plot allows the user to turn off 'ShowArrowHead' but this modification is not updated in the corresponding legend.

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