在PyQt5中嵌入matplotlib画的图

小记：前段时间写程序，要在PyQt5中插入统计图，在网上查了很多资料，这里整理一下。

# coding:utf-8
import matplotlib
# 使用 matplotlib中的FigureCanvas (在使用 Qt5 Backends中 FigureCanvas继承自QtWidgets.QWidget)
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from PyQt5 import QtCore, QtWidgets, QtGui
from PyQt5.QtWidgets import QDialog, QPushButton, QVBoxLayout
import matplotlib.pyplot as plt
import numpy as np
import sys


class Main_window(QDialog):
    def __init__(self):
        super().__init__()

        # 几个QWidgets
        self.figure = plt.figure(facecolor='#FFD7C4') #可选参数,facecolor为背景颜色
        self.canvas = FigureCanvas(self.figure)
        self.button_draw = QPushButton("绘图")

        # 连接事件
        self.button_draw.clicked.connect(self.Draw)

        # 设置布局
        layout = QVBoxLayout()
        layout.addWidget(self.canvas)
        layout.addWidget(self.button_draw)
        self.setLayout(layout)

    def Draw(self):
        AgeList = ['10', '21', '12', '14', '25']
        NameList = ['Tom', 'Jon', 'Alice', 'Mike', 'Mary']

        #将AgeList中的数据转化为int类型
        AgeList = list(map(int, AgeList))

        # 将x,y轴转化为矩阵式
        self.x = np.arange(len(NameList)) + 1
        self.y = np.array(AgeList)

        #tick_label后边跟x轴上的值，（可选选项：color后面跟柱型的颜色，width后边跟柱体的宽度）
        plt.bar(range(len(NameList)), AgeList, tick_label=NameList, color='green', width=0.5)

        # 在柱体上显示数据
        for a, b in zip(self.x, self.y):
            plt.text(a-1, b, '%d' % b, ha='center', va='bottom')

        #设置标题
        plt.title("Demo")

        self.canvas.draw()


# 运行程序
if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    main_window = Main_window()
    main_window.show()
    app.exec()