我要评论参考网上的例子，实现了简单的matplotlib pyqt5绘图
相关知识点：
（1）pyqt5中添加控件要在布局中添加
（2）布局可以使用replacewidget替换控件
（3）信号与槽机制
timer = qtcore.qtimer(self) timer.timeout.connect(self.update_figure) self.btnplot.clicked.connect(self.plotbutton_callback)
实现的效果
import sys
from pyqt5 import qtcore, qtgui, uic
from pyqt5.qtwidgets import qmainwindow, qaction, qapp, qapplication, qmessagebox, qvboxlayout, qsizepolicy, qwidget
from pyqt5.qtgui import qicon
from matplotlib.backends.backend_qt5agg import figurecanvasqtagg as figurecanvas
from matplotlib.figure import figure
import matplotlib.pyplot as plt
import numpy as np
qtcreatorfile = "matplotlib_ui.ui"
# 使用uic加载
ui_mainwindow, qtbaseclass = uic.loaduitype(qtcreatorfile)
class mymplcanvas(figurecanvas):
"""这是一个窗口部件，即qwidget（当然也是figurecanvasagg）"""
def __init__(self, parent=none, width=5, height=4, dpi=100):
fig = figure(figsize=(width, height), dpi=dpi)
self.axes = fig.add_subplot(111)
# 每次plot()调用的时候，我们希望原来的坐标轴被清除(所以false)
self.axes.hold(false)
self.axes.grid('on')
self.compute_initial_figure()
#
figurecanvas.__init__(self, fig)
self.setparent(parent)
figurecanvas.setsizepolicy(self,
qsizepolicy.expanding,
qsizepolicy.expanding)
figurecanvas.updategeometry(self)
def compute_initial_figure(self):
pass
class mystaticmplcanvas(mymplcanvas):
"""静态画布：一条正弦线"""
def compute_initial_figure(self):
t = np.arange(0.0, 3.0, 0.01)
s = np.sin(2 * np.pi * t)
self.axes.grid('on')
self.axes.plot(t, s)
class mydynamicmplcanvas(mymplcanvas):
"""动态画布：每秒自动更新，更换一条折线。"""
def __init__(self, *args, **kwargs):
mymplcanvas.__init__(self, *args, **kwargs)
timer = qtcore.qtimer(self)
timer.timeout.connect(self.update_figure)
timer.start(1000)
def compute_initial_figure(self):
self.axes.grid('on')
self.axes.plot([0, 1, 2, 3], [1, 2, 0, 4], 'r')
def update_figure(self):
# 构建4个随机整数，位于闭区间[0, 10]
l = [np.random.randint(0, 10) for i in range(4)]
self.axes.grid('on')
self.axes.plot([0, 1, 2, 3], l, 'r')
self.draw()
class myapp(qmainwindow, ui_mainwindow):
def __init__(self):
qmainwindow.__init__(self)
ui_mainwindow.__init__(self)
super().__init__()
self.initui()
self.initbtn()
self.initframe()
def initframe(self):
self.main_widget = self.frame
self.layout = qvboxlayout(self.main_widget)
self.f = mymplcanvas(self.main_widget)
self.layout.addwidget(self.f)
def initui(self):
self.setupui(self)
self.setwindowtitle("pyqt5结合matplotlib绘图")
self.setwindowicon(qicon("rocket.ico")) # 设置图标，linux下只有任务栏会显示图标
self.show()
def initbtn(self):
self.btnplot.clicked.connect(self.plotbutton_callback)
self.btnplot.settooltip("button")
def plotbutton_callback(self):
self.drawframe()
def drawframe(self):
sc = mystaticmplcanvas(self.main_widget, width=5, height=4, dpi=100)
dc = mydynamicmplcanvas(self.f, width=5, height=4, dpi=100)
self.layout.addwidget(sc)
self.layout.replacewidget(self.f,dc) # 替换控件
if __name__ == '__main__':
app = qapplication(sys.argv)
ex = myapp()
sys.exit(app.exec_())
参考链接：
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