Python 如何在QtDesigner生成的代码中将qgraphicscene链接到QGraphicsView
我想在窗口中使用Python 如何在QtDesigner生成的代码中将qgraphicscene链接到QGraphicsView,python,pyqt5,Python,Pyqt5,我想在窗口中使用QGraphicsView显示图像。我有一个基本的QGraphicsView和一个从QtDesigner工具生成的基于按钮的test.ui文件。对应的test.py文件: # -*- coding: utf-8 -*- # Form implementation generated from reading ui file 'test.ui' # # Created by: PyQt5 UI code generator 5.9.2 # # WARNING! All chang
QGraphicsView
显示图像。我有一个基本的QGraphicsView
和一个从QtDesigner
工具生成的基于按钮的test.ui
文件。对应的test.py
文件:
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'test.ui'
#
# Created by: PyQt5 UI code generator 5.9.2
#
# WARNING! All changes made in this file will be lost!
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(640, 480)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
self.verticalLayout.setObjectName("verticalLayout")
self.graphicsView = QtWidgets.QGraphicsView(self.centralwidget)
self.graphicsView.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
self.graphicsView.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
self.graphicsView.setObjectName("graphicsView")
self.verticalLayout.addWidget(self.graphicsView)
self.pushButton = QtWidgets.QPushButton(self.centralwidget)
self.pushButton.setObjectName("pushButton")
self.verticalLayout.addWidget(self.pushButton)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 640, 26))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.pushButton.setText(_translate("MainWindow", "PushButton"))
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
我使用qgraphicscene
在QGraphicsView
中显示图像。我当前的工作解决方案是将上述.py文件弄乱,如下所示:
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'test.ui'
#
# Created by: PyQt5 UI code generator 5.9.2
#
# WARNING! All changes made in this file will be lost!
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.setObjectName("MainWindow")
MainWindow.resize(640, 480)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
self.verticalLayout.setObjectName("verticalLayout")
self.scene = QtWidgets.QGraphicsScene(self.centralwidget) #added
self.graphicsView = QtWidgets.QGraphicsView(self.scene) #edited
self.graphicsView.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
self.graphicsView.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn)
self.graphicsView.setObjectName("graphicsView")
self.verticalLayout.addWidget(self.graphicsView)
self.pushButton = QtWidgets.QPushButton(self.centralwidget)
self.pushButton.setObjectName("pushButton")
self.verticalLayout.addWidget(self.pushButton)
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 640, 26))
self.menubar.setObjectName("menubar")
MainWindow.setMenuBar(self.menubar)
self.statusbar = QtWidgets.QStatusBar(MainWindow)
self.statusbar.setObjectName("statusbar")
MainWindow.setStatusBar(self.statusbar)
self.retranslateUi(MainWindow)
QtCore.QMetaObject.connectSlotsByName(MainWindow)
def retranslateUi(self, MainWindow):
_translate = QtCore.QCoreApplication.translate
MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
self.pushButton.setText(_translate("MainWindow", "PushButton"))
self.pushButton.clicked.connect(self.display)
def display(self):
import imageio, numpy
self.scene.clear()
input_image = imageio.imread('image.jpg').copy()
height, width, channels = input_image.shape
bytesPerLine = channels * width
qimg = QtGui.QImage(input_image, width, height, bytesPerLine, QtGui.QImage.Format_RGB888)
self.pixmap = QtGui.QPixmap.fromImage(qimg)
self.scene.addPixmap(self.pixmap) #add pixmap to scene
self.graphicsView.scale(0.5,0.5)
self.scene.update()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
然而,这种解决办法并不系统。我想在不编辑原始test.ui
生成的test.py
文件的情况下执行相同的操作
所以,我尝试了下面的代码,在我看来,这就像是对先前工作代码的系统翻译。但是,它无法在点击按钮时显示:
from PyQt5 import QtCore, QtGui, QtWidgets
from test import Ui_MainWindow
class myWindow(QtWidgets.QMainWindow, Ui_MainWindow):
def __init__(self, parent=None):
QtWidgets.QMainWindow.__init__(self, parent=parent)
self.setupUi(self)
self.scene = QtWidgets.QGraphicsScene(self.centralwidget) #append scene method
self.graphicsView = QtWidgets.QGraphicsView(self.scene) #graphicsView re-assigned with scene
self.pushButton.clicked.connect(self.display)
def display(self):
import imageio, numpy
self.scene.clear()
input_image = imageio.imread('image.jpg').copy()
height, width, channels = input_image.shape
bytesPerLine = channels * width
qimg = QtGui.QImage(input_image, width, height, bytesPerLine, QtGui.QImage.Format_RGB888)
self.pixmap = QtGui.QPixmap.fromImage(qimg)
self.scene.addPixmap(self.pixmap) #add pixmap to scene
self.graphicsView.scale(0.5,0.5)
self.scene.update()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = myWindow()
w.show()
sys.exit(app.exec_())
由于我对类继承的理解有限,QGraphicsView
和qgraphicscene
,我可能把事情搞砸了。任何指向我错误的指点都会很有帮助
注意:我正在使用
myWindow
类将来集成一些按键功能。我认为问题更多的是如何在父类函数中选择性地追加/重新定义几行。甚至不重新编写整个setupUi
方法也可以这样做吗?或者,还有其他更智能的方法来执行相同的任务吗?您必须将场景设置为现有的QGraphicsView,而不是创建新的QGraphicsView:
class myWindow(QtWidgets.QMainWindow, Ui_MainWindow):
def __init__(self, parent=None):
QtWidgets.QMainWindow.__init__(self, parent)
self.setupUi(self)
self.scene = QtWidgets.QGraphicsScene(self.centralwidget)
self.graphicsView.setScene(self.scene)
self.pushButton.clicked.connect(self.display)
def display(self):
# ...
类myWindow(QtWidgets.QMainWindow,Ui\u MainWindow):
def uuu init uuu(self,parent=None):
qtwidts.QMainWindow.\uuuuu init\uuuuuu(self,parent)
self.setupUi(self)
self.scene=qtwidts.qgraphicscene(self.centralwidget)
self.graphicsView.setScene(self.scene)
self.button.clicked.connect(self.display)
def显示(自):
#…
决不能修改生成的pyuic
文件,因此导入方法是正确的。除此之外,无需使用imageio和numpy来加载图像,因为您只需使用QtGui.QPixmap(pathToImageFile)
。谢谢@musicamante。很好地了解了QtGui.QPixmap(pathToImageFile)
。稍后我将不得不生成图像作为ndarray,这样可以保留numpy用于一些算术。哇!这很有道理。非常感谢@eyllanesc。