Thanks. The intention is to make the added circle dragable by the mouse by listening to mouse press, move, and release.
That means that I have to modify the data of the added scatter data. I believe that the axes.scatter() method returns a matplotlib.collections.CircleCollection object. How do I change the position of the circles (one circle) contained in this object? Mads On 2011-03-09 15:28, Benjamin Root wrote: > On Wednesday, March 9, 2011, 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, > > The way this is done is tricky. The transform object assigned to the > circles in plot() and scatter() are different than the default when > you make a circle polygon yourself. The easiest way to get them is to > just simply use scatter() and pass in your own size value. > > I hope that helps! > Ben Root -- +--------------------------------------------------------------+ | 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
