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June 2011

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Interactive_Plotting incorrect selection of nearest point
by julien.delafontaine＠epfl.ch June 1, 2011

June 1, 2011

Hi, I used this script from Scipy's Cookbook http://www.scipy.org/Cookbook/Matplotlib/Interactive_Plotting As it is, the distance between two points is not well defined, because for selecting the nearest point around where you click, you want to minimize the distance in pixels, not depending on different scales for x and y coordinates. So I suggest this correction (divide coordinates by the scale of each axis): def __init__(self, xdata, ydata, annotes, axis=None, xtol=None, ytol=None): self.data = zip(xdata, ydata, annotes) self.xrange = max(xdata) - min(xdata) self.yrange = max(ydata) - min(ydata) ... def __call__(self, event): if event.inaxes: clickX = event.xdata clickY = event.ydata if self.axis is None or self.axis==event.inaxes: annotes = [] for x,y,a in self.data: if clickX-self.xtol < x < clickX+self.xtol and clickY-self.ytol < y < clickY+self.ytol : annotes.append((self.distance(x/self.xrange,clickX/self.xrange,y/self.yrange,clickY/self.yrange),x,y, a) ) ... Julien Delafontaine

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