没有箭头茎的箭袋图 [英] Quiver plot without arrow stem

问题描述

我正在 MATLAB 中模拟粒子的运动.我正在使用 quiver 来获得它们的运动方向.但是，我只想有没有茎的箭头.我无法做到这一点.

I am simulating the motion of particles in MATLAB. I am using quiver to be able to get the direction of their motion. However, I would like to have only the arrowhead without the stem. I am unable to achieve this.

我尝试使用以下方法，

quiver(x,y,vx,vy,'LineStyle','none','ShowArrowHead','on')

去掉茎，但箭头也没有出现.有没有办法解决这个问题?

to get rid of the stem, but the arrowhead too does not show up. Is there a way around this?

推荐答案

'LineStyle','none' 不起作用，因为样式同时适用于词干和头部，因此设置它到 none 隐藏两者.

'LineStyle','none' didn't work because the style applies both to the stem and to the head, so setting it to none hides both.

这可以通过挖掘 Quiver 对象的一些未记录的属性来解决.探索 Quiver 对象的属性(使用 struct())我们可以看到一个箭袋图有 NodeChildren属性，并且它由 4 个元素组成，

This can be solved by digging around some undocumented properties of the Quiver object. Exploring the properties of a Quiver object (using struct(<handle to quiver plot>)) we can see that a quiver plot has NodeChildren property, and that it is made of 4 elements,

>> hq = quiver(x,y,u,v);
>> hq.NodeChildren
ans = 
  4×1 graphics array:

  ListOfPointsHighlight
  LineStrip
  LineStrip
  Marker

您在上面看到的 LineStrip 对象从上到下对应于尾部和头部.从这里开始，只需通过它们的 Visible 属性隐藏尾部:

The LineStrip objects you see above, correspond, from top to bottom, to tails and the heads. From here it's just a matter of hiding the tails via their Visible property:

[x,y] = meshgrid(0:0.2:2,0:0.2:2);
u = cos(x).*y;
v = sin(x).*y;

figure();
hq = quiver(x,y,u,v);

pause(0.1); % this appears to help
hq.NodeChildren(2).Visible = 'off';

结果:

在 R2019a 上测试.

Tested on R2019a.

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