Bug summary

When a stream plot is drawn, curvature to the lines given by using smaller lines. However, these lines are never connected to each other. When the curvature is high the non-connection becomes visible if user saves the figure for later usage.

The visibility problem does not seem to be existent using show function. I have tested the pdf, svg, eps, png file types and all have the same issue.

Code for reproduction

importnumpyasnpimportmatplotlib.pyplotaspltw=3Y,X=np.mgrid[-w:w:100j,-w:w:100j]U=-1-X**2+YV=1+X-Y**2fig=plt.figure(1)plt.streamplot(X,Y,U,V)plt.show()fig.savefig("streamline.pdf")

Actual outcome

Below is a screenshot of single line when selected in Inkscape.

Expected outcome

A random plot produced with matplotlib. In this picture, Inkscape shows the line is connected through its nodes.

Operating system

Arch

Matplotlib Version

3.6.2

Matplotlib Backend

QtAgg

Python version

3.10.8