在場景中復制粘貼QGraphicsitem時遇到問題。

我嘗試了以下代碼，但它不能正常工作。

如果我嘗試粘貼項目，第一個實例就是正確粘貼。對于第二個實例，它刪除第一個實例項并粘貼第二個實例。在

到目前為止，我已經嘗試在復制操作中獲取項目的路徑，并將其添加到粘貼操作中的場景中。在

@pos2是我的格子位置

我只想粘貼復制的項目n次，直到新項目被復制。如果我復制粘貼的方式不對，請糾正我。在from PyQt5.QtCore import (QByteArray, QDataStream, QIODevice, QMimeData, QPointF, QPoint, Qt, QRect,QTimer,QLineF, QEvent,QRectF)

from PyQt5.QtGui import QColor, QDrag, QPainter, QPixmap,QFont,QFontMetrics,QBrush, QLinearGradient, QIcon, QPen, QPainterPath, QTransform,QCursor,QMouseEvent,QClipboard

from PyQt5.QtWidgets import QApplication,QGraphicsTextItem,QGraphicsItemGroup, QSizePolicy, QScrollArea, QPushButton,QLineEdit, QMainWindow,QInputDialog, QGraphicsPathItem,QDialog, QVBoxLayout,QGraphicsItem,QStatusBar,QTextEdit, QAction,QMenu, qApp,QSplitter, QButtonGroup, QToolButton, QFrame, QHBoxLayout, QGraphicsView, QGraphicsItem, QGraphicsPixmapItem, QLabel, QGraphicsScene, QWidget

class GraphicsSceneClass(QGraphicsScene):

global selectedObjType

def __init__(self, parent=None):

super(GraphicsSceneClass, self).__init__(parent)

self.setSceneRect(0, 0, 1920, 1080)

self.setItemIndexMethod(QGraphicsScene.NoIndex)

self.setBackgroundBrush(QBrush(Qt.black))

def mousePressEvent(self, event):

sampleTransform = QTransform()

objectAtMouse = self.itemAt(event.scenePos(), sampleTransform)

if objectAtMouse and event.button()== Qt.LeftButton:

objectAtMouse.setSelected(True)

elif objectAtMouse==None and event.button()==Qt.RightButton:

self.grid = self.TargPosForLine(event.scenePos(), "ForLine")

def TargPosForLine(self, position, mode):

clicked_column = int((position.y() // 16)) * 16

clicked_row = int((position.x() // 16)) * 16

if clicked_column < 0:

clicked_column = 0

if clicked_row < 0:

clicked_row = 0

if(mode == "ForRect"):

return QRect(clicked_row, clicked_column,16,16)

elif(mode == "ForLine"):

return QPointF(clicked_row,clicked_column)

class MainWindow(QMainWindow):

global selectedObjType

# global item

def __init__(self,):

super(MainWindow, self).__init__()

self.scene = GraphicsSceneClass()

MainWindow.obj = self.scene

self.view = QGraphicsView(self.scene)

self.view.setMouseTracking(True)

self.view.setRenderHint(QPainter.HighQualityAntialiasing)

self.widg = QWidget()

self.horizontalLayout = QHBoxLayout()

self.horizontalLayout.addWidget(self.view)

self.widg.setMouseTracking(True)

self.widget = QWidget()

self.widget.setLayout(self.horizontalLayout)

self.setCentralWidget(self.widget)

self.obj=None

def contextMenuEvent(self, event):

contextMenu = QMenu(self)

Cutaction = contextMenu.addAction("Cut")

Coaction = contextMenu.addAction("Copy")

Paaction = contextMenu.addAction("Paste")

Propaction = contextMenu.addAction("draw")

quitAct = contextMenu.addAction("quit")

action = contextMenu.exec_(self.mapToGlobal(event.pos()))

if action == quitAct:

self.close()

elif action == Propaction:

painterPath = QPainterPath()

painterPath.moveTo(10, 50.0)

painterPath.lineTo(50,50)

painterPath.lineTo(50,55)

painterPath.lineTo(10,55)

gradient = QLinearGradient(1, 1, 1, 5)

gradient.setColorAt(0, QColor(Qt.gray))

gradient.setColorAt(0.5, QColor(192, 192, 192, 255))

gradient.setColorAt(1, QColor(Qt.darkGray))

painterPath.closeSubpath()

objectDrop = QGraphicsPathItem()

objectDrop.setPath(painterPath)

objectDrop.setBrush(QBrush(gradient))

self.scene.addItem(objectDrop)

objectDrop.setFlag(QGraphicsItem.ItemIsSelectable)

objectDrop._type1="line"

# self.scene.addPath(painterPath)

elif action == Coaction:

self.copy()

elif action == Paaction:

self.paste()

def copy(self):

item = self.selectedItem()

self.dragObject = item

x = str(self.dragObject._type1)

if item is None:

return

if 'text' in x:

self.object = QGraphicsPixmapItem(item.pixmap())

else:

self.object = QGraphicsPathItem(item.path())

gradient = QLinearGradient(1, 1, 1, 5)

gradient.setColorAt(0, QColor(Qt.gray))

gradient.setColorAt(0.5, QColor(192, 192, 192, 255))

gradient.setColorAt(1, QColor(Qt.darkGray))

self.object.setBrush(QBrush(gradient))

self.object.setPen(QPen(Qt.NoPen))

self.object._type1 = item._type1

def paste(self):

self.scene.addItem(self.object)

self.object.setPos(self.scene.grid.x(), self.scene.grid.y())

def selectedItem(self):

items = self.scene.selectedItems()

if len(items) == 1:

return items[0]

return None

if __name__=="__main__":

import sys

app=QApplication(sys.argv)

mainWindow = MainWindow()

mainWindow.show()

sys.exit(app.exec_())

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