Hi there, I have the following simple code to plot a (static) fill_between region in a given plot. import numpy as np import matplotlib. pyplot as plt plt.figure() ax=plt.axes() ax.set_xlim([0,10000]) x = np.linspace(6000.,7000.) y = np.ones(np.shape(x)) plt.fill_between(x,y) I would like now to animate this band (which is a PolyCollection object, and not a Line2D one) so that it moves smoothly to the right up together with being stretched, that is, to the new x positions: .7200, 8400. I saw several animations in the matplotlib homepage, but they only looped over line or image objects, not polycollection ones, such as fill_between... Is this possible? In stackoverflow there is this link: http://stackoverflow.com/questions/16120801/matplotlib-animate-fill-between-shape, which might solve this question but I was not able to understand it fully in order to have a simple minmal working example. If that is the right direction, I would appreciate immensely if someone could provide such an example! Thanks in advance -- ####################################### Prof. Mauricio Ortiz Calvao Federal University of Rio de Janeiro Institute of Physics, P O Box 68528 CEP 21941-972 Rio de Janeiro, RJ Brazil Email: or...@if... Phone: (55)(21)25627483 Homepage: http://www.if.ufrj.br/~orca #######################################
Hi Mauricio, Patch objects are a bit more difficult to work with than line objects, because unlike line objects are a step removed from the input data supplied by the user. There is an example similar to what you want to do here: http://matplotlib.org/examples/animation/histogram.html Basically, you need to modify the vertices of the path at each frame. It might look something like this: from matplotlib import animation import numpy as np import matplotlib.pyplot as plt fig, ax = plt.subplots() ax.set_xlim([0,10000]) x = np.linspace(6000.,7000., 5) y = np.ones_like(x) collection = plt.fill_between(x, y) def animate(i): path = collection.get_paths()[0] path.vertices[:, 1] *= 0.9 animation.FuncAnimation(fig, animate, frames=25, interval=30) Take a look at path.vertices to see how they're laid out. Hope that helps, Jake On Sat, Feb 1, 2014 at 7:44 AM, Mauricio Calvao <moc...@gm...> wrote: > Hi there, > > I have the following simple code to plot a (static) fill_between region > in a given plot. > > > import numpy as np > import matplotlib. pyplot as plt > > plt.figure() > ax=plt.axes() > ax.set_xlim([0,10000]) > > x = np.linspace(6000.,7000.) > y = np.ones(np.shape(x)) > > plt.fill_between(x,y) > > > I would like now to animate this band (which is a PolyCollection object, > and not a Line2D one) so that it moves smoothly to the right up together > with being stretched, that is, to the new x positions: .7200, 8400. I saw > several animations in the matplotlib homepage, but they only looped over > line or image objects, not polycollection ones, such as fill_between... Is > this possible? > > In stackoverflow there is this link: > http://stackoverflow.com/questions/16120801/matplotlib-animate-fill-between-shape, > which might solve this question but I was not able to understand it fully > in order to have a simple minmal working example. If that is the right > direction, I would appreciate immensely if someone could provide such an > example! > > Thanks in advance > > -- > ####################################### > Prof. Mauricio Ortiz Calvao > Federal University of Rio de Janeiro > Institute of Physics, P O Box 68528 > CEP 21941-972 Rio de Janeiro, RJ > Brazil > > Email: or...@if... > Phone: (55)(21)25627483 > Homepage: http://www.if.ufrj.br/~orca > ####################################### > > > ------------------------------------------------------------------------------ > WatchGuard Dimension instantly turns raw network data into actionable > security intelligence. It gives you real-time visual feedback on key > security issues and trends. Skip the complicated setup - simply import > a virtual appliance and go from zero to informed in seconds. > > http://pubads.g.doubleclick.net/gampad/clk?id=123612991&iu=/4140/ostg.clktrk > _______________________________________________ > Matplotlib-devel mailing list > Mat...@li... > https://lists.sourceforge.net/lists/listinfo/matplotlib-devel > >
Thank you Jake. I will take a look at this example with care. Cheers! On Sun, Feb 2, 2014 at 2:10 PM, Jacob Vanderplas <ja...@cs...>wrote: > Hi Mauricio, > Patch objects are a bit more difficult to work with than line objects, > because unlike line objects are a step removed from the input data supplied > by the user. There is an example similar to what you want to do here: > http://matplotlib.org/examples/animation/histogram.html > > Basically, you need to modify the vertices of the path at each frame. It > might look something like this: > > from matplotlib import animation > import numpy as np > import matplotlib.pyplot as plt > > fig, ax = plt.subplots() > ax.set_xlim([0,10000]) > > x = np.linspace(6000.,7000., 5) > y = np.ones_like(x) > > collection = plt.fill_between(x, y) > > def animate(i): > path = collection.get_paths()[0] > path.vertices[:, 1] *= 0.9 > > animation.FuncAnimation(fig, animate, > frames=25, interval=30) > > Take a look at path.vertices to see how they're laid out. > Hope that helps, > Jake > > > On Sat, Feb 1, 2014 at 7:44 AM, Mauricio Calvao <moc...@gm...>wrote: > >> Hi there, >> >> I have the following simple code to plot a (static) fill_between region >> in a given plot. >> >> >> import numpy as np >> import matplotlib. pyplot as plt >> >> plt.figure() >> ax=plt.axes() >> ax.set_xlim([0,10000]) >> >> x = np.linspace(6000.,7000.) >> y = np.ones(np.shape(x)) >> >> plt.fill_between(x,y) >> >> >> I would like now to animate this band (which is a PolyCollection object, >> and not a Line2D one) so that it moves smoothly to the right up together >> with being stretched, that is, to the new x positions: .7200, 8400. I saw >> several animations in the matplotlib homepage, but they only looped over >> line or image objects, not polycollection ones, such as fill_between... Is >> this possible? >> >> In stackoverflow there is this link: >> http://stackoverflow.com/questions/16120801/matplotlib-animate-fill-between-shape, >> which might solve this question but I was not able to understand it fully >> in order to have a simple minmal working example. If that is the right >> direction, I would appreciate immensely if someone could provide such an >> example! >> >> Thanks in advance >> >> -- >> ####################################### >> Prof. Mauricio Ortiz Calvao >> Federal University of Rio de Janeiro >> Institute of Physics, P O Box 68528 >> CEP 21941-972 Rio de Janeiro, RJ >> Brazil >> >> Email: or...@if... >> Phone: (55)(21)25627483 >> Homepage: http://www.if.ufrj.br/~orca >> ####################################### >> >> >> ------------------------------------------------------------------------------ >> WatchGuard Dimension instantly turns raw network data into actionable >> security intelligence. It gives you real-time visual feedback on key >> security issues and trends. Skip the complicated setup - simply import >> a virtual appliance and go from zero to informed in seconds. >> >> http://pubads.g.doubleclick.net/gampad/clk?id=123612991&iu=/4140/ostg.clktrk >> _______________________________________________ >> Matplotlib-devel mailing list >> Mat...@li... >> https://lists.sourceforge.net/lists/listinfo/matplotlib-devel >> >> > -- ####################################### Prof. Mauricio Ortiz Calvao Federal University of Rio de Janeiro Institute of Physics, P O Box 68528 CEP 21941-972 Rio de Janeiro, RJ Brazil Email: or...@if... Phone: (55)(21)25627483 Homepage: http://www.if.ufrj.br/~orca #######################################