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POUsing matplotlib to label points on a scatter plot on mouse over with some label other than x,y coordinates
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copied!<p>I am trying to use the DataCursor approach (<a href="https://stackoverflow.com/a/4674445/1301710">https://stackoverflow.com/a/4674445/1301710</a>) to label points using matplotlib. I have several thousand points and would like to see their label on mouseover. However, there are two differences: one, I'm making a scatter plot and two, I want to label names for each point and not just the x,y coordinates.</p> <p>here is my code</p> <pre><code>import os import matplotlib.pyplot as plt class DataCursor(object): text_template = 'x: %0.2f\ny: %0.2f' x, y = 0.0, 0.0 xoffset, yoffset = -20, 20 text_template = 'x: %0.2f\ny: %0.2f' def __init__(self, ax, labels,x,y): self.ax = ax self.xlist = x self.ylist = y self.labels = labels self.annotation = ax.annotate(self.text_template, xy=(self.x, self.y), xytext=(self.xoffset, self.yoffset), textcoords='offset points', ha='right', va='bottom', bbox=dict(boxstyle='round,pad=0.5', fc='yellow', alpha=0.5), arrowprops=dict(arrowstyle='->', connectionstyle='arc3,rad=0') ) self.annotation.set_visible(False) def __call__(self, event): self.event = event xdata, ydata = event.artist.get_data() #self.x, self.y = xdata[event.ind], ydata[event.ind] self.x, self.y = event.mouseevent.xdata, event.mouseevent.ydata self.label = self.labels[self.xlist.index(self.x)] if self.x is not None: self.annotation.xy = self.x, self.y self.annotation.set_text(self.label) self.annotation.set_visible(True) event.canvas.draw() def process(): #code to make ht_dict here # ht_dict has the following format: 'ht1' = [nov14count, nov21count] where each key is a string and each value is a list of two integers print("Start making scatter plot..") hts = [] nov14 = [] nov21 = [] for key in ht_dict.keys(): nov14.append(ht_dict[key][0]) nov21.append(ht_dict[key][1]) hts.append(key) fig = plt.figure() scatter = plt.scatter(nov14, nov21) fig.canvas.mpl_connect('pick_event', DataCursor(plt.gca(), hts, nov14, nov21)) scatter.set_picker(5) plt.show() process() </code></pre> <p>I am getting the following error though:</p> <pre><code>AttributeError: 'CircleCollection' object has no attribute 'get_data' </code></pre> <p>I want to be able to see the string stored in the list hts on mouseover at the x and y coordinates stored in nov14 and nov21 lists respectively at the same indices. I'm not sure what to make of this error and would appreciate any help. Another question I have is (from trying out changes on the existing plot in the DataCursor thread) that using index of to get back label as I am currently doing will give me a value doesn't exist in list error since the clicked on value may not be exactly same as the value in the list. Do you have any suggestions of a better way to display some label/name about a point?</p> <p>Any guidance or pointers to documentation where I could read up would be appreciated.</p> <p>Thanks!</p>

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