+1 for including Brian's changes in the shipping example. Brian, You might also be interested in an alternate, polygon-based lasso I developed a while back. Though it meets my needs, beware of backend-specific problems with idle events that I never resolved.
-Eric http://www.nabble.com/Alternate-lasso:-click-to-form-polygon-td18724261.html On Sun, Dec 7, 2008 at 10:24 AM, B Clowers <clowe...@yahoo.com> wrote: > When running the initial lasso demo I found that only one lasso event was > allowed and other canvas interaction events (e.g. zooming) would not work > properly after the lasso event. As such I came up with my own solution to > the problem by modifying the example source. The primary addition was a > button release event call and a boolean to keep track whether the lasso was > the last event to lock the widget from interaction. Anyway, I hope it can > help someone else out. > > Cheers, > > Brian > > #################################### > """ > Show how to use a lasso to select a set of points and get the indices > of the selected points. A callback is used to change the color of the > selected points > > This is currently a proof-of-concept implementation (though it is > usable as is). There will be some refinement of the API and the > inside polygon detection routine. > """ > from matplotlib.widgets import Lasso > import matplotlib.mlab > from matplotlib.nxutils import points_inside_poly > from matplotlib.colors import colorConverter > from matplotlib.collections import RegularPolyCollection > > from matplotlib.pyplot import figure, show > from numpy import nonzero > from numpy.random import rand > > class Datum: > colorin = colorConverter.to_rgba('red') > colorout = colorConverter.to_rgba('green') > def __init__(self, x, y, include=False): > self.x = x > self.y = y > if include: self.color = self.colorin > else: self.color = self.colorout > > > class LassoManager: > def __init__(self, ax, data): > self.axes = ax > self.canvas = ax.figure.canvas > self.data = data > #the lasso lock boolean is used to tell whether another > #widget event has priority > self.lassoLock = False > > self.Nxy = len(data) > > facecolors = [d.color for d in data] > self.xys = [(d.x, d.y) for d in data] > fig = ax.figure > self.collection = RegularPolyCollection( > fig.dpi, 6, sizes=(100,), > facecolors=facecolors, > offsets = self.xys, > transOffset = ax.transData) > > ax.add_collection(self.collection) > > self.cid = self.canvas.mpl_connect('button_press_event', > self.onpress) > self.cidRelease = self.canvas.mpl_connect('button_release_event', > self.onrelease) > > self.ind = None > > def callback(self, verts): > facecolors = self.collection.get_facecolors() > ind = nonzero(points_inside_poly(self.xys, verts))[0] > for i in range(self.Nxy): > if i in ind: > facecolors[i] = Datum.colorin > else: > facecolors[i] = Datum.colorout > > self.canvas.draw_idle() > self.canvas.widgetlock.release(self.lasso) > #del self.lasso > self.ind = ind > > def onpress(self, event): > if self.canvas.widgetlock.locked(): return > if event.inaxes is None: return > self.lasso = Lasso(event.inaxes, (event.xdata, event.ydata), > self.callback) > # acquire a lock on the widget drawing > self.canvas.widgetlock(self.lasso) > # establish boolean that can be used to release the widgetlock > self.lassoLock = True > > def onrelease(self, event): > 'on release we reset the press data' > # test whether the widgetlock was initiated by the lasso > if self.lassoLock: > self.canvas.widgetlock.release(self.lasso) > self.lassoLock = False > print self.ind > > > if __name__ == '__main__': > > data = [Datum(*xy) for xy in rand(100, 2)] > > fig = figure() > ax = fig.add_subplot(111, xlim=(0,1), ylim=(0,1), autoscale_on=False) > lman = LassoManager(ax, data) > > show() > > > ------------------------------------------------------------------------------ > SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. > The future of the web can't happen without you. Join us at MIX09 to help > pave the way to the Next Web now. Learn more and register at > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > > ------------------------------------------------------------------------------ SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, Nevada. The future of the web can't happen without you. Join us at MIX09 to help pave the way to the Next Web now. Learn more and register at http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix.com/ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
