Joe的方法工作正常，但是它使一组可拖动点作为一个类，而不是单个可拖动点类。我只是遇到了一种使用动画blit技术解决上述问题的替代方法。它不仅使拖动更快，更流畅，而且只能拖动一个点。请参阅以下代码。
import matplotlib.pyplot as pltimport matplotlib.patches as patchesclass DraggablePoint: lock = None #only one can be animated at a time def __init__(self, point): self.point = point self.press = None self.background = None def connect(self): 'connect to all the events we need' self.cidpress = self.point.figure.canvas.mpl_connect('button_press_event', self.on_press) self.cidrelease = self.point.figure.canvas.mpl_connect('button_release_event', self.on_release) self.cidmotion = self.point.figure.canvas.mpl_connect('motion_notify_event', self.on_motion) def on_press(self, event): if event.inaxes != self.point.axes: return if DraggablePoint.lock is not None: return contains, attrd = self.point.contains(event) if not contains: return self.press = (self.point.center), event.xdata, event.ydata DraggablePoint.lock = self # draw everything but the selected rectangle and store the pixel buffer canvas = self.point.figure.canvas axes = self.point.axes self.point.set_animated(True) canvas.draw() self.background = canvas.copy_from_bbox(self.point.axes.bbox) # now redraw just the rectangle axes.draw_artist(self.point) # and blit just the redrawn area canvas.blit(axes.bbox) def on_motion(self, event): if DraggablePoint.lock is not self: return if event.inaxes != self.point.axes: return self.point.center, xpress, ypress = self.press dx = event.xdata - xpress dy = event.ydata - ypress self.point.center = (self.point.center[0]+dx, self.point.center[1]+dy) canvas = self.point.figure.canvas axes = self.point.axes # restore the background region canvas.restore_region(self.background) # redraw just the current rectangle axes.draw_artist(self.point) # blit just the redrawn area canvas.blit(axes.bbox) def on_release(self, event): 'on release we reset the press data' if DraggablePoint.lock is not self: return self.press = None DraggablePoint.lock = None # turn off the rect animation property and reset the background self.point.set_animated(False) self.background = None # redraw the full figure self.point.figure.canvas.draw() def disconnect(self): 'disconnect all the stored connection ids' self.point.figure.canvas.mpl_disconnect(self.cidpress) self.point.figure.canvas.mpl_disconnect(self.cidrelease) self.point.figure.canvas.mpl_disconnect(self.cidmotion)fig = plt.figure()ax = fig.add_subplot(111)drs = []circles = [patches.Circle((0.32, 0.3), 0.03, fc='r', alpha=0.5), patches.Circle((0.3,0.3), 0.03, fc='g', alpha=0.5)]for circ in circles: ax.add_patch(circ) dr = DraggablePoint(circ) dr.connect() drs.append(dr)plt.show()
