PyQT5：我如何绘制现有的QGraphicsVIew？
问题描述：
就像标题说我试图在现有的QGraphicsView中绘制。我使用QT Designer生成的窗口，我想在QGraphicsView内绘制一个16x16的矩形。PyQT5：我如何绘制现有的QGraphicsVIew？
这是我为现在的代码：
窗口：
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'untitled.ui'
#
# Created by: PyQt5 UI code generator 5.8.2
#
# 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(911, 567)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.centralwidget.setObjectName("centralwidget")
self.label = QtWidgets.QLabel(self.centralwidget)
self.label.setGeometry(QtCore.QRect(20, 10, 301, 31))
font = QtGui.QFont()
font.setPointSize(12)
font.setBold(True)
font.setWeight(75)
self.label.setFont(font)
self.label.setObjectName("label")
self.groupBox = QtWidgets.QGroupBox(self.centralwidget)
self.groupBox.setGeometry(QtCore.QRect(620, 40, 271, 91))
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.groupBox.setFont(font)
self.groupBox.setObjectName("groupBox")
self.rdtest = QtWidgets.QRadioButton(self.groupBox)
self.rdtest.setGeometry(QtCore.QRect(60, 60, 101, 22))
self.rdtest.setObjectName("rdtest")
self.rdtrain = QtWidgets.QRadioButton(self.groupBox)
self.rdtrain.setGeometry(QtCore.QRect(60, 30, 101, 22))
self.rdtrain.setObjectName("rdtrain")
self.graphicsView = QtWidgets.QGraphicsView(self.centralwidget)
self.graphicsView.setGeometry(QtCore.QRect(10, 40, 601, 411))
self.graphicsView.setObjectName("graphicsView")
self.clear = QtWidgets.QPushButton(self.centralwidget)
self.clear.setGeometry(QtCore.QRect(10, 470, 88, 29))
self.clear.setObjectName("clear")
self.trainNewInput = QtWidgets.QPushButton(self.centralwidget)
self.trainNewInput.setGeometry(QtCore.QRect(500, 470, 111, 29))
self.trainNewInput.setObjectName("trainNewInput")
self.trainbox = QtWidgets.QGroupBox(self.centralwidget)
self.trainbox.setGeometry(QtCore.QRect(620, 150, 271, 171))
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.trainbox.setFont(font)
self.trainbox.setObjectName("trainbox")
self.vtrain = QtWidgets.QLineEdit(self.trainbox)
self.vtrain.setGeometry(QtCore.QRect(100, 70, 101, 29))
self.vtrain.setObjectName("vtrain")
self.label_2 = QtWidgets.QLabel(self.trainbox)
self.label_2.setGeometry(QtCore.QRect(40, 70, 56, 31))
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.label_2.setFont(font)
self.label_2.setObjectName("label_2")
self.trainDefault = QtWidgets.QPushButton(self.trainbox)
self.trainDefault.setGeometry(QtCore.QRect(40, 30, 161, 29))
self.trainDefault.setObjectName("trainDefault")
self.output = QtWidgets.QLabel(self.trainbox)
self.output.setGeometry(QtCore.QRect(10, 130, 271, 17))
self.output.setText("")
self.output.setObjectName("output")
self.output_2 = QtWidgets.QLabel(self.trainbox)
self.output_2.setGeometry(QtCore.QRect(10, 150, 271, 17))
self.output_2.setText("")
self.output_2.setObjectName("output_2")
self.testbox = QtWidgets.QGroupBox(self.centralwidget)
self.testbox.setGeometry(QtCore.QRect(620, 330, 271, 171))
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.testbox.setFont(font)
self.testbox.setObjectName("testbox")
self.pushButton = QtWidgets.QPushButton(self.testbox)
self.pushButton.setGeometry(QtCore.QRect(50, 40, 161, 29))
self.pushButton.setObjectName("pushButton")
MainWindow.setCentralWidget(self.centralwidget)
self.menubar = QtWidgets.QMenuBar(MainWindow)
self.menubar.setGeometry(QtCore.QRect(0, 0, 911, 23))
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.label.setText(_translate("MainWindow", "RNA: Numeros "))
self.groupBox.setTitle(_translate("MainWindow", "Opciones:"))
self.rdtest.setText(_translate("MainWindow", "Test"))
self.rdtrain.setText(_translate("MainWindow", "Train"))
self.clear.setText(_translate("MainWindow", "Clear"))
self.trainNewInput.setText(_translate("MainWindow", "Train new Input"))
self.trainbox.setTitle(_translate("MainWindow", "Train:"))
self.label_2.setText(_translate("MainWindow", "% Test:"))
self.trainDefault.setText(_translate("MainWindow", "Train Default Data"))
self.testbox.setTitle(_translate("MainWindow", "Test:"))
self.pushButton.setText(_translate("MainWindow", "Start Test"))
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_())
逻辑类，我想创建一个对的QGraphicsView吸引了来自窗口的方法：
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QGraphicsScene
from PyQt5.QtCore import (QLineF, QPointF, QRectF, Qt)
from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtWidgets import (QApplication, QGraphicsView, QGraphicsScene, QGraphicsItem,
QGridLayout, QVBoxLayout, QHBoxLayout,
QLabel, QLineEdit, QPushButton)
from window import Ui_MainWindow
from RNA import NumberIA
train = []
train_r = []
test = []
test_r = []
class MyFirstGuiProgram(Ui_MainWindow):
def __init__(self, dialog):
Ui_MainWindow.__init__(self)
self.setupUi(dialog)
self.rdtrain.setChecked(True)
# Connect "add" button with a custom function (addInputTextToListbox)
self.clear.clicked.connect(self.addInputTextToListbox)
self.trainDefault.clicked.connect(self.t_DefaultData)
self.rdtest.clicked.connect(self.enableTest)
self.rdtrain.clicked.connect(self.enableTrain)
def enableTest(self):
self.trainbox.setEnabled(False)
self.trainNewInput.setEnabled(False)
self.testbox.setEnabled(True)
def drawSomething(self):
tes = "f"
def enableTrain(self):
self.trainbox.setEnabled(True)
self.trainNewInput.setEnabled(True)
self.testbox.setEnabled(False)
def addInputTextToListbox(self):
print("Hello world!!!")
def t_DefaultData(self):
ann = NumberIA()
t = self.vtrain.text()
print("Training data: ", t)
global train
global train_r
global test
global test_r
train, train_r, test, test_r = ann.read_file(float(t))
self.output.setText("Train complete...")
ann.crear_red(train, train_r)
accuracy, matrix = ann.probar_red(test, test_r)
self.output_2.setText("Accuracy: " + str(accuracy * 100) + "%")
print("Matris de Confusion:")
print('\n'.join([''.join(['{:4}'.format(item) for item in row])
for row in matrix]))
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = MyFirstGuiProgram(MainWindow)
MainWindow.show()
MainWindow.setWindowTitle("RNA: Inteligencia Artificial 2")
ui.enableTrain()
sys.exit(app.exec_())
我似乎找不到关于如何在线的例子，我发现的例子对我来说很模糊，而且似乎无法找到它出。
答
我建议你从QMainWindow继承并实现Ui_MainWindow接口，在QGraphicsView吸引你必须使用QGraphicsScene，并使用它的方法，在这种情况下使用addRect()。
from PyQt5 import QtCore, QtGui, QtWidgets
class MyFirstGuiProgram(QtWidgets.QMainWindow, Ui_MainWindow):
def __init__(self, parent=None):
QtWidgets.QMainWindow.__init__(self, parent=parent)
self.setupUi(self)
scene = QtWidgets.QGraphicsScene()
self.graphicsView.setScene(scene)
pen = QtGui.QPen(QtCore.Qt.green)
side = 20
for i in range(16):
for j in range(16):
r = QtCore.QRectF(QtCore.QPointF(i*side, j*side), QtCore.QSizeF(side, side))
scene.addRect(r, pen)
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
w = MyFirstGuiProgram()
w.show()
sys.exit(app.exec_())
答
很好的例子@eyllanesc只是给你的权利之上，这里是另一个小例子，我刚好已经奠定周围，如果你需要画是一个简单的免费手。
- 让你的主窗口，例如QMainWindow中或者QWidget的或...
- 有一个的QGraphicsView。
- 设置QGraphicsView的场景与你的QGraphicsScene
- 有你自己的QGraphicsPathItem，所以你可以设置你需要的属性。
- 有你想要在场景中绘制什么的实现，所以它知道如何绘制自己。
有了这样的东西，你就可以控制几个场景，知道如何独立绘制自己，当然如果你需要多个场景。
这个例子的逻辑是在QGraphicsView中实现的，你可以将它移动到你的GraphicsScene中。
class MainWindow(QMainWindow):
central_widget = None
layout_container = None
def __init__(self):
super(MainWindow, self).__init__()
self.central_widget = QWidget()
self.layout_container = QVBoxLayout()
self.central_widget.setLayout(self.layout_container)
self.setCentralWidget(self.central_widget)
self.layout_container.addWidget(GraphicsView())
class GraphicsView(QGraphicsView):
start = None
end = None
item = None
path = None
def __init__(self):
super(GraphicsView, self).__init__()
self.setScene(QGraphicsScene())
self.path = QPainterPath()
self.item = GraphicsPathItem()
self.scene().addItem(self.item)
def mousePressEvent(self, event):
self.start = self.mapToScene(event.pos())
self.path.moveTo(self.start)
def mouseMoveEvent(self, event):
self.end = self.mapToScene(event.pos())
self.path.lineTo(self.end)
self.start = self.end
self.item.setPath(self.path)
class GraphicsPathItem(QGraphicsPathItem):
def __init__(self):
super(GraphicsPathItem, self).__init__()
pen = QPen()
pen.setColor(Qt.black)
pen.setWidth(10)
self.setPen(pen)
if __name__ == '__main__':
app = QApplication(sys.argv)
mw = MainWindow()
mw.show()
sys.exit(app.exec_())
+0
这也是很好的例子，感谢分享 –
谢谢你的回答，将upvote –