matplotlib 4点画矩形框

要使用matplotlib库中的patches.Rectangle函数来画矩形框，需要提供四个参数：xy、width、height、angle。其中xy表示矩形框的左下角坐标，width和height分别表示矩形框的宽度和高度，angle表示矩形框的旋转角度。

下面是一个使用matplotlib库画矩形框的示例代码：

import matplotlib.patches as patches
import matplotlib.pyplot as plt

fig = plt.figure()
ax = fig.add_subplot(111)
currentAxis = plt.gca()

# 定义矩形框的左下角坐标、宽度和高度
xy = (x_rect, y_rect)
width = target_height*Tr/480
height = target_weight*fr/fft_2pow_point

# 创建矩形对象并添加到当前子图
rect = patches.Rectangle(xy, width, height, linewidth=2, edgecolor='r', facecolor='none')
currentAxis.add_patch(rect)

plt.show()

在该示例代码中，xy的值可以根据具体需求进行调整，width和height可以根据目标矩形框的大小进行设定。rect对象表示矩形框，调整linewidth、edgecolor和facecolor可以改变矩形框的线条宽度、边框颜色和填充颜色。

你可以根据自己的需求修改示例代码中的参数值，来画出你想要的矩形框。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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