On Wed, Mar 9, 2011 at 8:15 AM, Mads Ipsen <madsip...@gmail.com> wrote:
> Here is a script (below). > > I want the blue circle to appear as a circle with a 1:1 aspect ratio, > making it look like a circle and not an ellipse. Just like the scale free > circles making up the curve of the damped oscillationsn also shown in the > plot. > > Preferably, the circle should also be scale free making it have the same > size no-matter how much the plot has been zoomed. > You could use a big marker in a scatter plot; the default marker style is a circle. For example: ----- import numpy as np import matplotlib.pyplot as plt from matplotlib.patches import CirclePolygon x = np.arange(0, 10, 0.1) y = np.exp(-x/2.) * np.sin(2*np.pi*x) fig = plt.figure() ax = fig.add_subplot(111) ax.plot(x, y, 'ro-', zorder=0) ax.set_xlim(0, 10) ax.set_ylim(-1, 1) # I want this circle to appear as a circle ##circle = CirclePolygon((7.5,0.0), radius=0.1, zorder=1) ##ax.add_patch(circle) plt.scatter([7.5],[0.0], s=800, edgecolor='k', facecolor='b', alpha=0.5) plt.show() ----- Warren > > Best regards, > > Mads > > import numpy as np > import matplotlib.pyplot as plt > from matplotlib.patches import CirclePolygon > > x = np.arange(0, 10, 0.1) > y = np.exp(-x/2.) * np.sin(2*np.pi*x) > > fig = plt.figure() > ax = fig.add_subplot(111) > ax.plot(x, y, 'ro-', zorder=0) > ax.set_xlim(0, 10) > ax.set_ylim(-1, 1) > > # I want this circle to appear as a circle > circle = CirclePolygon((7.5,0.0), radius=0.1, zorder=1) > ax.add_patch(circle) > > plt.show() > > > > On 2011-03-09 15:00, Aman Thakral wrote: > > Could you provide some sample code that recreates the problem (and shows > what you're trying to accomplish)? > > On Wed, Mar 9, 2011 at 8:58 AM, Mads Ipsen <madsip...@gmail.com> wrote: > >> I tried that, but that will make the entire plot look very strange if >> xlim = [0;100] and ylim=[-1:1]. >> >> What I really want to do is add a scale free aspect ratio correct circle >> to the plot. Just like the circles that appear on a scatter plot. >> >> Best regards, >> >> Mads >> >> >> On 2011-03-09 14:44, Aman Thakral wrote: >> >> Hi Mads, >> >> Did you add axis='equal' to you axes command? >> >> e.g. ax = fig.add_subplot(111, aspect='equal') >> >> -Aman >> >> On Wed, Mar 9, 2011 at 6:07 AM, Mads Ipsen <madsip...@gmail.com> wrote: >> >>> Hi, >>> >>> I am using the Qt4 based back engine for displaying a 2D plot in a >>> widget. The plot typically contains lots of line plots. Suppose I add a >>> CirclePolygon to the plot like this: >>> >>> circle = CirclePolygon((x,y), radius=0.04, edgecolor='black', >>> facecolor='red', zorder=1) >>> axes.add_patch(circle) >>> >>> Then when I start to zoom in the window the aspect ratio of the circle >>> is not preserved (it appears like an ellipse). If you plot a line with >>> points, displaying its points using circles, these circles do have their >>> aspect ratio (and size) preserved. There must be some approach for >>> achieving the same effect for a manually added circle. >>> >>> Any help is appreciated, >>> >>> Best regards, >>> >>> Mads >>> >>> -- >>> +--------------------------------------------------------------+ >>> | Mads Ipsen, Scientific developer | >>> +-------------------------------+------------------------------+ >>> | QuantumWise A/S | phone: +45-29716388 | >>> | Lersø Parkallé 107 | www: www.quantumwise.com | >>> | DK-2100 Copenhagen Ø, Denmark | email: mads.ip...@gmail.com | >>> +-------------------------------+------------------------------+ >>> >>> >>> >>> >>> ------------------------------------------------------------------------------ >>> Colocation vs. Managed Hosting >>> A question and answer guide to determining the best fit >>> for your organization - today and in the future. >>> http://p.sf.net/sfu/internap-sfd2d >>> _______________________________________________ >>> Matplotlib-users mailing list >>> Matplotlib-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/matplotlib-users >>> >> >> >> -- >> +--------------------------------------------------------------+ >> | Mads Ipsen, Scientific developer | >> +-------------------------------+------------------------------+ >> | QuantumWise A/S | phone: +45-29716388 | >> | Lersø Parkallé 107 | www: www.quantumwise.com | >> | DK-2100 Copenhagen Ø, Denmark | email: mads.ip...@gmail.com | >> +-------------------------------+------------------------------+ >> >> >> > > -- > +--------------------------------------------------------------+ > | Mads Ipsen, Scientific developer | > +-------------------------------+------------------------------+ > | QuantumWise A/S | phone: +45-29716388 | > | Lersø Parkallé 107 | www: www.quantumwise.com | > | DK-2100 Copenhagen Ø, Denmark | email: mads.ip...@gmail.com | > +-------------------------------+------------------------------+ > > > > > ------------------------------------------------------------------------------ > Colocation vs. Managed Hosting > A question and answer guide to determining the best fit > for your organization - today and in the future. > http://p.sf.net/sfu/internap-sfd2d > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > >
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