Python 在线程中创建的绘图不会显示
我是Python新手,我想请您帮助我解决代码中的一个问题。我使用QtDesigner创建UI,然后使用pyuic4将其转换为test.py文件。我还有mplwidget.py和modules.py文件,如下所示: test.pyPython 在线程中创建的绘图不会显示,python,matplotlib,pyqt,Python,Matplotlib,Pyqt,我是Python新手,我想请您帮助我解决代码中的一个问题。我使用QtDesigner创建UI,然后使用pyuic4将其转换为test.py文件。我还有mplwidget.py和modules.py文件,如下所示: test.py from PyQt4 import QtCore, QtGui from numpy import * import threading, thread from matplotlib.backends.backend_qt4agg import FigureCanva
from PyQt4 import QtCore, QtGui
from numpy import *
import threading, thread
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName(_fromUtf8("MainWindow"))
MainWindow.resize(617, 588)
self.centralwidget = QtGui.QWidget(MainWindow)
self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
self.verticalLayout = QtGui.QVBoxLayout(self.centralwidget)
self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
self.tabWidget = QtGui.QTabWidget(self.centralwidget)
self.tabWidget.setObjectName(_fromUtf8("tabWidget"))
self.tab = QtGui.QWidget()
self.tab.setObjectName(_fromUtf8("tab"))
self.verticalLayout_2 = QtGui.QVBoxLayout(self.tab)
self.verticalLayout_2.setObjectName(_fromUtf8("verticalLayout_2"))
self.pushButton = QtGui.QPushButton(self.tab)
self.pushButton.setObjectName(_fromUtf8("pushButton"))
self.verticalLayout_2.addWidget(self.pushButton)
self.pushButton_2 = QtGui.QPushButton(self.tab)
self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))
self.verticalLayout_2.addWidget(self.pushButton_2)
self.tabWidget.addTab(self.tab, _fromUtf8(""))
self.tab_2 = QtGui.QWidget()
self.tab_2.setObjectName(_fromUtf8("tab_2"))
self.verticalLayout_3 = QtGui.QVBoxLayout(self.tab_2)
self.verticalLayout_3.setObjectName(_fromUtf8("verticalLayout_3"))
self.widget = MplWidget(self.tab_2)
sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)
sizePolicy.setHorizontalStretch(0)
sizePolicy.setVerticalStretch(0)
sizePolicy.setHeightForWidth(self.widget.sizePolicy().hasHeightForWidth())
self.widget.setSizePolicy(sizePolicy)
self.widget.setObjectName(_fromUtf8("widget"))
self.verticalLayout_3.addWidget(self.widget)
self.tabWidget.addTab(self.tab_2, _fromUtf8(""))
self.verticalLayout.addWidget(self.tabWidget)
MainWindow.setCentralWidget(self.centralwidget)
self.statusbar = QtGui.QStatusBar(MainWindow)
self.statusbar.setObjectName(_fromUtf8("statusbar"))
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
self.tabWidget.setCurrentIndex(0)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow", None))
self.pushButton.setText(_translate("MainWindow", "PushButton I", None))
self.pushButton_2.setText(_translate("MainWindow", "PushButton II", None))
self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab), _translate("MainWindow", "Tab 1", None))
self.tabWidget.setTabText(self.tabWidget.indexOf(self.tab_2), _translate("MainWindow", "Tab 2", None))
QtCore.QObject.connect(self.pushButton, QtCore.SIGNAL(_fromUtf8("pressed()")), self.ploting1)
QtCore.QObject.connect(self.pushButton_2, QtCore.SIGNAL(_fromUtf8("pressed()")), self.calling)
def calling(self):
from modules import MyForm
arg="yes",
tmain=threading.Thread(target=MyForm().ploting2,args=(arg))
tmain.start()
def ploting1(self,plot="yes"):
if plot != "no":
t = logspace(1E-6,1,132,base=1E-6)
y1 = exp(-t/1E-3)
self.widget.canvas.fig.clear()
self.widget.canvas.ax = self.widget.canvas.fig.add_axes([0.15, 0.15, 0.7, 0.7])
self.widget.canvas.ax.set_xlabel('t')
self.widget.canvas.ax.set_ylabel('corr')
label1='y1'
self.widget.canvas.ax.semilogx(t,y1,'ro-',label=label1)
self.widget.canvas.ax.legend(loc='lower left')
self.widget.canvas.ax.tick_params(axis='y', colors='red')
self.widget.canvas.draw()
self.tabWidget.setCurrentIndex(1)
from mplwidget import MplWidget
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
MainWindow = QtGui.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
模块.py
from numpy import *
from test import Ui_MainWindow
from mplwidget import MplWidget
class MyForm(QtGui.QMainWindow, Ui_MainWindow):
def __init__(self, parent=None):
super(MyForm, self).__init__(parent)
self.setupUi(self)
def ploting2(self,plot="yes"):
if plot != "no":
t = logspace(1E-6,1,132,base=1E-6)
y1 = exp(-t/1E-3)
self.widget.canvas.fig.clear()
self.widget.canvas.ax = self.widget.canvas.fig.add_axes([0.15, 0.15, 0.7, 0.7])
self.widget.canvas.ax.set_xlabel('t')
self.widget.canvas.ax.set_ylabel('corr')
label1='y1'
self.widget.canvas.ax.semilogx(t,y1,'ro-',label=label1)
self.widget.canvas.ax.legend(loc='lower left')
self.widget.canvas.ax.tick_params(axis='y', colors='red')
self.widget.canvas.draw()
self.tabWidget.setCurrentIndex(1)
mplwidget.py
from PyQt4 import QtGui
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
class MplCanvas(FigureCanvas):
"""Class to represent the FigureCanvas widget"""
def __init__(self, parent=None, name=None, width=5, height=4, dpi=100, bgcolor=None):
self.parent = parent
if self.parent:
bgc = parent.backgroundBrush().color()
bgcolor = float(bgc.red())/255.0, float(bgc.green())/255.0, float(bgc.blue())/255.0
self.fig = Figure(figsize=(width, height), dpi=dpi, facecolor=bgcolor, edgecolor=bgcolor)
self.ax = self.fig.add_subplot(111)
self.ax.hold(False)
FigureCanvas.__init__(self, self.fig)
FigureCanvas.setSizePolicy(self,
QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
class MplWidget(QtGui.QWidget):
"""Widget defined in Qt Designer"""
def __init__(self, parent = None):
QtGui.QWidget.__init__(self, parent)
self.canvas = MplCanvas()
self.vbl = QtGui.QVBoxLayout()
self.vbl.addWidget(self.canvas)
self.setLayout(self.vbl)
正如你在主窗口看到的,我有两个按钮。第一个连接到test.py中定义的函数(ploting1),并在选项卡2中绘制图形。问题出现在按钮2中,我使用线程调用modules.py中定义的函数(ploting2)。我使用线程是因为我需要在绘制曲线的同时执行一些计算。这两个函数都相同,但从modules.py调用的函数不显示绘图。有没有关于我做错了什么的暗示
提前谢谢你的帮助
PS:我没有收到错误消息,一切正常,除了按钮2没有显示绘图。这里有几个问题。前两个以这条线为中心:
tmain=threading.Thread(target=MyForm().ploting2,args=(arg))
tmain
是一个局部变量。当调用
方法完成时,
线程将被垃圾回收。所以它不会运行theadeding.Thread
调用的参数中实例化MyForm()
,但不保存引用。创建的对象。因此,对象中包含的GUI将被垃圾收集,并且将不再存在self.tmain=…
,等等),但从下一个问题中可以看出,这是毫无意义的
QCoreApplication.postEvent()
)或将数据放入Python队列
一些相关链接(不一定给出绘图示例,但应给出总体思路):
- :我合著的一个模块,使函数(如绘图函数)始终在主线程中运行变得容易,即使它们是从另一个线程调用的