matplotlib|演示matplotlib中,如何在坐标系中画一个矩形 matplotlib|Python

演示matplotlib中,如何在坐标系中画一个矩形

import matplotlib.pyplot as plt from matplotlib.patches import Rectangle class Annotate(object): def __init__(self): self.ax = plt.gca() self.rect = Rectangle((0,0), 1, 1) self.x0 = None self.y0 = None self.x1 = None self.y1 = None self.ax.add_patch(self.rect) self.ax.figure.canvas.mpl_connect('button_press_event', self.on_press) self.ax.figure.canvas.mpl_connect('button_release_event', self.on_release)def on_press(self, event): print 'press' self.x0 = event.xdata self.y0 = event.ydatadef on_release(self, event): print 'release' self.x1 = event.xdata self.y1 = event.ydata self.rect.set_width(self.x1 - self.x0) self.rect.set_height(self.y1 - self.y0) self.rect.set_xy((self.x0, self.y0)) self.ax.figure.canvas.draw()a = Annotate() plt.show()

如下图所示
【matplotlib|演示matplotlib中,如何在坐标系中画一个矩形】