Florian Leitner wrote: > Hi; I've got a rather simple question. I want to (color) fill a step > plot below the line, but using the fill() function always creates > regular plots, not step plots, and fillstyle doesn't work as I'd expect > it to. How can I fill a step plot? Something like this: > > import matplotlib.pyplot as plt > x = [0.0,0.5,0.66,0.75,1.0] > y = [0.72,0.72,0.61,0.43,0.33] > plt.step(x, y, fillstyle="bottom") # doesn't work how I imagine... > plt.axis([0.0,1.0,0.0,1.0]) > plt.show() > > What I want is that the area below the step-plot line is color-filled, > but I seem to be unable to find a function for it. If I use plt.fill(), > it creates a polygon plot and it does not allow to use the kwarg > drawstyle="steps", so I get no further with this function either. > > I guess it's a simple problem, but I'm having a bit of a hard time > wading though all the API, being completely new to matplotlib, so some > help would be very welcome! > --Florian
It looks to me like there is no easy way to do it. This is a deficiency in the way steps are implemented at present. The generation of the stepped path is buried in a Line2D helper method, and the path is not saved. If it were, its x and y coordinates could be passed to fill_between, which would then provide the effect you want. Unless and until some refactoring is done in mpl, you will have to manually generate the x and y coordinates corresponding to your stepped line instead of using plt.step. It may be too much of a change to make to the API now, but I think that the step-generation should not be done in Line2D at all; it should be at the next level up. The Line2D object should not be modifying the coordinates it is given. At the very least, its get_path() should return the actual path it is drawing; at present it does not. This latter change may be relatively easy. Eric > > > > **NOTA DE CONFIDENCIALIDAD** Este correo electrónico, y en su caso los > ficheros adjuntos, pueden contener información protegida para el uso > exclusivo de su destinatario. Se prohíbe la distribución, reproducción o > cualquier otro tipo de transmisión por parte de otra persona que no sea > el destinatario. Si usted recibe por error este correo, se ruega > comunicarlo al remitente y borrar el mensaje recibido. > **CONFIDENTIALITY NOTICE** This email communication and any attachments > may contain confidential and privileged information for the sole use of > the designated recipient named above. Distribution, reproduction or any > other use of this transmission by any party other than the intended > recipient is prohibited. If you are not the intended recipient please > contact the sender and delete all copies. > > > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------------ > Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day > trial. Simplify your report design, integration and deployment - and focus on > what you do best, core application coding. Discover what's new with > Crystal Reports now. http://p.sf.net/sfu/bobj-july > > > ------------------------------------------------------------------------ > > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
