def __iniGraphicsSystem(self): ##初始化 Graphics View系统
self.view=QmyGraphicsView(self) #创建图形视图组件
self.setCentralWidget(self.view)
self.scene=QGraphicsScene(-300,-200,600,200) #创建QGraphicsScene
self.view.setScene(self.scene) #与view关联
self.view.setCursor(Qt.CrossCursor) #设置鼠标
self.view.setMouseTracking(True)
self.view.setDragMode(QGraphicsView.RubberBandDrag)
## 4个信号与槽函数的关联
self.view.mouseMove.connect(self.do_mouseMove) #鼠标移动
self.view.mouseClicked.connect(self.do_mouseClicked) #左键按下
self.view.mouseDoubleClick.connect(self.do_mouseDoubleClick) #鼠标双击
self.view.keyPress.connect(self.do_keyPress) #左键按下
def __buildUI(self): ##构造界面
self.resize(600, 450)
self.setWindowTitle("Demo8_5, View/Scene/Item关系和坐标变换")
font = self.font()
font.setPointSize(11)
self.setFont(font)
centralWidget = QWidget(self) #中间工作区组件
vLayoutMain = QVBoxLayout(centralWidget) #垂直布局
groupBox = QGroupBox(centralWidget) #显示两个Label的groupBox
vLayoutGroup = QVBoxLayout(groupBox)
self.__labViewSize = QLabel(groupBox)
self.__labViewSize.setText("view坐标，左上角(0,0)，宽度=，长度=")
vLayoutGroup.addWidget(self.__labViewSize)
self.__labSceneRect = QLabel(groupBox)
self.__labSceneRect.setText("view.sceneRect=()")
vLayoutGroup.addWidget(self.__labSceneRect)
vLayoutMain.addWidget(groupBox) #主布局添加groupBox
self.view = QmyGraphicsView(centralWidget) #绘图视图
self.view.setCursor(Qt.CrossCursor)
self.view.setMouseTracking(True)
## self.view.setDragMode(QGraphicsView.RubberBandDrag)
vLayoutMain.addWidget(self.view) #添加到主布局
self.setCentralWidget(centralWidget) #设置工作区中间组件
statusBar = QStatusBar(self) #状态栏
self.setStatusBar(statusBar)
self.__labViewCord = QLabel("View 坐标：")
self.__labViewCord.setMinimumWidth(150)
statusBar.addWidget(self.__labViewCord)
self.__labSceneCord = QLabel("Scene 坐标：")
self.__labSceneCord.setMinimumWidth(150)
statusBar.addWidget(self.__labSceneCord)
self.__labItemCord = QLabel("Item 坐标：")
self.__labItemCord.setMinimumWidth(150)
statusBar.addWidget(self.__labItemCord)