On 2013/01/22 11:50 PM, Andrew Dawson wrote: > Hi all, > > [TL;DR: is it possible to control the length of the dashes in dashed > contours, if so how?] > > I'd like to be able to control the length of dashes for dashed contours. > My motivation is that I'm making a contour plot that uses dashes for the > negative contours, and the plot needs to be a specific (small) size for > the particular journal, so the small size of the plot makes the dashes > look rather long and is a problem for some tight contours. > > I have tried using some a dashes-style argument for the linestyles > keyword of contour but I can't get it to work (although I appreciate it > is not documented as something one can do). For example I tried: > > import matplotlib.pyplot as plt > import numpy as np > x = y = np.linspace(-np.pi, np.pi, 100) > X, Y = np.meshgrid(x, y) > Z = np.sin(X) * np.cos(Y) > plt.contour(x, y, Z, linestyles=[(3, 3)]) > plt.show() > > This fails at the point where I show (or save, doesn't matter which > backend) the plot with a PyCXX error: > > TypeError: PyCXX: Error creating object of type > N2Py7SeqBaseINS_6ObjectEEE from 3 > > I've fiddled with several other styles of argument and all fail in a > similar way.
There seems to be a nasty tangle of bugs and obsolete documentation here. It should be perfectly simple and straightforward, but it isn't. https://github.com/matplotlib/matplotlib/issues/1701 Eric > > What I'd like to know is: is it possible to control the dash length of > dashed contours at all? It seems like it should be as one can do this > with lines easy enough. I looked through the code, and a dashes-style > argument seems to get passed through the stack correctly, but fails when > the Collection is drawn. It would be a really nice feature if this could > be implemented in matplotlib. > > Thanks, > Andrew > > > ------------------------------------------------------------------------------ > Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, > MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current > with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft > MVPs and experts. ON SALE this month only -- learn more at: > http://p.sf.net/sfu/learnnow-d2d > > > > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
