Tom Aldcroft wrote: > I've run into a case where the rendering in a line plot is incomplete > and some lines are not drawn at all. Basically I have a dataset (see > below) where I know two points go to a value of zero. When I plot > the points and do interactive pan/zoom sometimes the line going down > to zero is there and sometimes not. After a bunch of playing around > trying to reduce the problem to a minimum the script below is what I > got. If I tried to make the 'y' array much smaller then the problem > went away. I played with antialias and interactive settings with no > benefit. Changing the window size can also produce the same effect > I'm describing. Finally, when I use savefig to save in various > formats the results varied, perhaps just a side-effect of the size of > the saved figure. > > I'm using Matplotlib 0.99.1.1 built from source with the TkAgg backend > on CentOS-5 with python 2.6. This same problem was also evident using > GtkAgg and MacOSX backends so I don't think the details of my build > are relevant (but I can supply if needed). > > Thanks, Tom
It works for me in svn, so I am pretty sure you have run into the infamous path simplification bug. If you are building from source anyway, then just build from svn. Alternatively, you can put path.simplify : False in your matplotlibrc file to disable path simplification. Eric > > import numpy > import matplotlib.pyplot as plt > > y = numpy.array([ > 4., 2., 2., 3., 3., 2., 2., 6., 6., 5., 5., 4., 4., > 7., 7., 2., 2., 4., 4., 2., 2., 2., 2., 4., 4., 4., > 4., 4., 4., 7., 7., 3., 3., 5., 5., 4., 4., 5., 5., > 4., 4., 7., 7., 6., 6., 2., 2., 2., 2., 5., 5., 4., > 4., 4., 4., 6., 6., 3., 3., 4., 4., 3., 3., 2., 2., > 3., 3., 4., 4., 4., 4., 4., 4., 6., 6., 5., 5., 4., > 4., 7., 7., 3., 3., 4., 4., 4., 4., 5., 5., 4., 4., > 7., 7., 3., 3., 4., 4., 4., 4., 6., 6., 4., 4., 4., > 4., 4., 4., 2., 2., 5., 5., 6., 6., 3., 3., 5., 5., > 4., 4., 0., 0., 5., 5., 1., 1., 4., 4., 5., 5., 4.]) > > plt.figure() > plt.plot(y) > > plt.figure() > plt.plot(y) > plt.xlim(-7200, 6500) > # Does it go down to 0 now? > > ------------------------------------------------------------------------------ > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users ------------------------------------------------------------------------------ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
