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PYQT 圖形查看圖像的像素值

[英]PYQT Graphics View Pixel Value of an image

 原文  2017-11-01 21:43:39  3   1    python/ python-3.x/ graphics/ pyqt/ pyqt5

問題描述

我有一個關於如何在移動鼠標的同時從圖片中獲取 RGB 值的問題。 我有幾line edit框，當我將鼠標移到圖片上時，我希望這些值發生變化。 我很接近，但它還沒有工作。 我明白為什么這不能按照我想要的方式工作，但我不確定如何解決它。

這是如何設置的

我使用 Qt 設計器制作 GUI，然后將其翻譯成我引用的 Python 代碼。在我的主窗口中，我有一個 MDI 區域和一些line edit框。 當我打開一張照片時，它會創建一個新的 MDI 窗口，該窗口具有與之關聯的graphic view和scroll area 。 為了跟蹤鼠標移動，我在graphic view的視口上使用了installEventFilter 。 所以任何在視圖中的東西都會給我那個視圖中的坐標，而不是整個圖片本身。

我的問題的例子

如果我加載的圖片比我的屏幕大，它會將滾動條放在一邊。 只要我在頂部，一切似乎都可以正常工作，但是如果我向下滾動或向一側或另一側滾動，現在圖片已經移動但視口沒有。

我想要什么

我的最終目標是能夠獲取鼠標當前所在圖片中每個像素的坐標，然后從中提取 RGB 值。 如果我移動鼠標，那么坐標就會改變。 從那里我只想在幾line edit框中的值隨着我移動鼠標而改變。

主窗口截圖主窗口的屏幕截圖

主窗口

這是我的 Main_GUI.py 文件

 from PyQt5 import QtCore, QtGui, QtWidgets

    class Ui_MainWindow(object):
        def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(818, 814)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        self.Button_LoadPhoto = QtWidgets.QPushButton(self.centralwidget)
        self.Button_LoadPhoto.setObjectName("Button_LoadPhoto")
        self.gridLayout.addWidget(self.Button_LoadPhoto, 1, 0, 1, 1)
        self.splitter = QtWidgets.QSplitter(self.centralwidget)
        self.splitter.setOrientation(QtCore.Qt.Horizontal)
        self.splitter.setObjectName("splitter")
        self.mdiArea = QtWidgets.QMdiArea(self.splitter)
        self.mdiArea.setObjectName("mdiArea")
        self.verticalLayoutWidget = QtWidgets.QWidget(self.splitter)
        self.verticalLayoutWidget.setObjectName("verticalLayoutWidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.verticalLayoutWidget)
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout.setObjectName("verticalLayout")
        self.tabWidget_Calb = QtWidgets.QTabWidget(self.verticalLayoutWidget)
        self.tabWidget_Calb.setObjectName("tabWidget_Calb")
        self.tab_calibration = QtWidgets.QWidget()
        self.tab_calibration.setObjectName("tab_calibration")
        self.gridLayout_3 = QtWidgets.QGridLayout(self.tab_calibration)
        self.gridLayout_3.setContentsMargins(0, 0, 0, 0)
        self.gridLayout_3.setObjectName("gridLayout_3")
        self.UserInput_Calibration_ScaleFactor = QtWidgets.QLineEdit(self.tab_calibration)
        self.UserInput_Calibration_ScaleFactor.setObjectName("UserInput_Calibration_ScaleFactor")
        self.gridLayout_3.addWidget(self.UserInput_Calibration_ScaleFactor, 2, 2, 1, 2)
        self.txt_Calibration_ScaleFactor = QtWidgets.QLabel(self.tab_calibration)
        self.txt_Calibration_ScaleFactor.setObjectName("txt_Calibration_ScaleFactor")
        self.gridLayout_3.addWidget(self.txt_Calibration_ScaleFactor, 2, 1, 1, 1)
        self.txt_Calibration_X1 = QtWidgets.QLabel(self.tab_calibration)
        self.txt_Calibration_X1.setObjectName("txt_Calibration_X1")
        self.gridLayout_3.addWidget(self.txt_Calibration_X1, 0, 0, 1, 1)
        self.UserInput_Calibration_X1 = QtWidgets.QLineEdit(self.tab_calibration)
        self.UserInput_Calibration_X1.setObjectName("UserInput_Calibration_X1")
        self.gridLayout_3.addWidget(self.UserInput_Calibration_X1, 0, 1, 1, 1)
        self.txt_Calibration_Y1 = QtWidgets.QLabel(self.tab_calibration)
        self.txt_Calibration_Y1.setObjectName("txt_Calibration_Y1")
        self.gridLayout_3.addWidget(self.txt_Calibration_Y1, 1, 0, 1, 1)
        self.UserInput_Calibration_X2 = QtWidgets.QLineEdit(self.tab_calibration)
        self.UserInput_Calibration_X2.setObjectName("UserInput_Calibration_X2")
        self.gridLayout_3.addWidget(self.UserInput_Calibration_X2, 0, 3, 1, 1)
        self.UserInput_Calibration_Y2 = QtWidgets.QLineEdit(self.tab_calibration)
        self.UserInput_Calibration_Y2.setObjectName("UserInput_Calibration_Y2")
        self.gridLayout_3.addWidget(self.UserInput_Calibration_Y2, 1, 3, 1, 1)
        self.txt_Calibration_X2 = QtWidgets.QLabel(self.tab_calibration)
        self.txt_Calibration_X2.setObjectName("txt_Calibration_X2")
        self.gridLayout_3.addWidget(self.txt_Calibration_X2, 0, 2, 1, 1)
        self.UserInput_Calibration_Y1 = QtWidgets.QLineEdit(self.tab_calibration)
        self.UserInput_Calibration_Y1.setObjectName("UserInput_Calibration_Y1")
        self.gridLayout_3.addWidget(self.UserInput_Calibration_Y1, 1, 1, 1, 1)
        self.txt_Calibration_Y2 = QtWidgets.QLabel(self.tab_calibration)
        self.txt_Calibration_Y2.setObjectName("txt_Calibration_Y2")
        self.gridLayout_3.addWidget(self.txt_Calibration_Y2, 1, 2, 1, 1)
        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.txt_scale = QtWidgets.QLabel(self.tab_calibration)
        self.txt_scale.setObjectName("txt_scale")
        self.horizontalLayout.addWidget(self.txt_scale)
        self.radioButton_Log = QtWidgets.QRadioButton(self.tab_calibration)
        self.radioButton_Log.setEnabled(True)
        self.radioButton_Log.setChecked(True)
        self.radioButton_Log.setObjectName("radioButton_Log")
        self.horizontalLayout.addWidget(self.radioButton_Log)
        self.radioButton_Linear = QtWidgets.QRadioButton(self.tab_calibration)
        self.radioButton_Linear.setObjectName("radioButton_Linear")
        self.horizontalLayout.addWidget(self.radioButton_Linear)
        self.gridLayout_3.addLayout(self.horizontalLayout, 5, 0, 1, 4)
        self.txt_Calibration_X1.raise_()
        self.UserInput_Calibration_X1.raise_()
        self.txt_Calibration_Y1.raise_()
        self.UserInput_Calibration_Y1.raise_()
        self.txt_Calibration_X2.raise_()
        self.UserInput_Calibration_X2.raise_()
        self.txt_Calibration_Y2.raise_()
        self.UserInput_Calibration_Y2.raise_()
        self.UserInput_Calibration_ScaleFactor.raise_()
        self.txt_Calibration_ScaleFactor.raise_()
        self.tabWidget_Calb.addTab(self.tab_calibration, "")
        self.verticalLayout.addWidget(self.tabWidget_Calb)
        self.tabWidget_2 = QtWidgets.QTabWidget(self.verticalLayoutWidget)
        self.tabWidget_2.setObjectName("tabWidget_2")
        self.tab_PValues = QtWidgets.QWidget()
        self.tab_PValues.setObjectName("tab_PValues")
        self.gridLayout_2 = QtWidgets.QGridLayout(self.tab_PValues)
        self.gridLayout_2.setContentsMargins(0, 0, 0, 0)
        self.gridLayout_2.setObjectName("gridLayout_2")
        self.txt_PixelValue_G = QtWidgets.QLabel(self.tab_PValues)
        self.txt_PixelValue_G.setObjectName("txt_PixelValue_G")
        self.gridLayout_2.addWidget(self.txt_PixelValue_G, 2, 0, 1, 1)
        self.txt_PixelValue_R = QtWidgets.QLabel(self.tab_PValues)
        self.txt_PixelValue_R.setObjectName("txt_PixelValue_R")
        self.gridLayout_2.addWidget(self.txt_PixelValue_R, 1, 0, 1, 1)
        self.txt_PixelValue_Y = QtWidgets.QLabel(self.tab_PValues)
        self.txt_PixelValue_Y.setObjectName("txt_PixelValue_Y")
        self.gridLayout_2.addWidget(self.txt_PixelValue_Y, 0, 3, 1, 1)
        self.UserInput_PixelValue_Y = QtWidgets.QLineEdit(self.tab_PValues)
        self.UserInput_PixelValue_Y.setObjectName("UserInput_PixelValue_Y")
        self.gridLayout_2.addWidget(self.UserInput_PixelValue_Y, 0, 4, 1, 1)
        self.UserInput_PixelValue_X = QtWidgets.QLineEdit(self.tab_PValues)
        self.UserInput_PixelValue_X.setObjectName("UserInput_PixelValue_X")
        self.gridLayout_2.addWidget(self.UserInput_PixelValue_X, 0, 1, 1, 1)
        self.txt_PixelValue_X = QtWidgets.QLabel(self.tab_PValues)
        self.txt_PixelValue_X.setObjectName("txt_PixelValue_X")
        self.gridLayout_2.addWidget(self.txt_PixelValue_X, 0, 0, 1, 1)
        self.UserInput_PixelValue_R = QtWidgets.QLineEdit(self.tab_PValues)
        self.UserInput_PixelValue_R.setObjectName("UserInput_PixelValue_R")
        self.gridLayout_2.addWidget(self.UserInput_PixelValue_R, 1, 1, 1, 1)
        self.UserInput_PixelValue_G = QtWidgets.QLineEdit(self.tab_PValues)
        self.UserInput_PixelValue_G.setObjectName("UserInput_PixelValue_G")
        self.gridLayout_2.addWidget(self.UserInput_PixelValue_G, 2, 1, 1, 1)
        self.UserInput_PixelValue_B = QtWidgets.QLineEdit(self.tab_PValues)
        self.UserInput_PixelValue_B.setObjectName("UserInput_PixelValue_B")
        self.gridLayout_2.addWidget(self.UserInput_PixelValue_B, 3, 1, 1, 1)
        self.txt_PixelValue_B = QtWidgets.QLabel(self.tab_PValues)
        self.txt_PixelValue_B.setObjectName("txt_PixelValue_B")
        self.gridLayout_2.addWidget(self.txt_PixelValue_B, 3, 0, 1, 1)
        self.tabWidget_2.addTab(self.tab_PValues, "")
        self.tab_Statistics = QtWidgets.QWidget()
        self.tab_Statistics.setObjectName("tab_Statistics")
        self.tabWidget_2.addTab(self.tab_Statistics, "")
        self.verticalLayout.addWidget(self.tabWidget_2)
        self.tabWidget_3 = QtWidgets.QTabWidget(self.verticalLayoutWidget)
        self.tabWidget_3.setObjectName("tabWidget_3")
        self.tab_History = QtWidgets.QWidget()
        self.tab_History.setObjectName("tab_History")
        self.tabWidget_3.addTab(self.tab_History, "")
        self.verticalLayout.addWidget(self.tabWidget_3)
        self.gridLayout.addWidget(self.splitter, 0, 0, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 818, 21))
        self.menubar.setObjectName("menubar")
        self.menuFile = QtWidgets.QMenu(self.menubar)
        self.menuFile.setObjectName("menuFile")
        self.menuEdit = QtWidgets.QMenu(self.menubar)
        self.menuEdit.setObjectName("menuEdit")
        self.menuImages = QtWidgets.QMenu(self.menubar)
        self.menuImages.setObjectName("menuImages")
        self.menuWindow = QtWidgets.QMenu(self.menubar)
        self.menuWindow.setObjectName("menuWindow")
        self.menuHelp = QtWidgets.QMenu(self.menubar)
        self.menuHelp.setObjectName("menuHelp")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.TopToolBar = QtWidgets.QToolBar(MainWindow)
        self.TopToolBar.setObjectName("TopToolBar")
        MainWindow.addToolBar(QtCore.Qt.TopToolBarArea, self.TopToolBar)
        self.LeftToolBar = QtWidgets.QToolBar(MainWindow)
        self.LeftToolBar.setObjectName("LeftToolBar")
        MainWindow.addToolBar(QtCore.Qt.LeftToolBarArea, self.LeftToolBar)
        self.actionNew = QtWidgets.QAction(MainWindow)
        self.actionNew.setObjectName("actionNew")
        self.actionOpen = QtWidgets.QAction(MainWindow)
        self.actionOpen.setObjectName("actionOpen")
        self.menuFile.addAction(self.actionNew)
        self.menuFile.addAction(self.actionOpen)
        self.menubar.addAction(self.menuFile.menuAction())
        self.menubar.addAction(self.menuEdit.menuAction())
        self.menubar.addAction(self.menuImages.menuAction())
        self.menubar.addAction(self.menuWindow.menuAction())
        self.menubar.addAction(self.menuHelp.menuAction())

        self.retranslateUi(MainWindow)
        self.tabWidget_Calb.setCurrentIndex(0)
        self.tabWidget_2.setCurrentIndex(0)
        self.tabWidget_3.setCurrentIndex(0)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.Button_LoadPhoto.setText(_translate("MainWindow", "Load Photo"))
        self.txt_Calibration_ScaleFactor.setText(_translate("MainWindow", "Scale Factor:"))
        self.txt_Calibration_X1.setText(_translate("MainWindow", "X1"))
        self.txt_Calibration_Y1.setText(_translate("MainWindow", "Y1:"))
        self.txt_Calibration_X2.setText(_translate("MainWindow", "X2:"))
        self.txt_Calibration_Y2.setText(_translate("MainWindow", "Y2:"))
        self.txt_scale.setText(_translate("MainWindow", "Scale:"))
        self.radioButton_Log.setText(_translate("MainWindow", "Logarithmic"))
        self.radioButton_Linear.setText(_translate("MainWindow", "Linear"))
        self.tabWidget_Calb.setTabText(self.tabWidget_Calb.indexOf(self.tab_calibration), _translate("MainWindow", "Calibration"))
        self.txt_PixelValue_G.setText(_translate("MainWindow", "G"))
        self.txt_PixelValue_R.setText(_translate("MainWindow", "R"))
        self.txt_PixelValue_Y.setText(_translate("MainWindow", "Y:"))
        self.txt_PixelValue_X.setText(_translate("MainWindow", "X:"))
        self.txt_PixelValue_B.setText(_translate("MainWindow", "B"))
        self.tabWidget_2.setTabText(self.tabWidget_2.indexOf(self.tab_PValues), _translate("MainWindow", "Pixel Values"))
        self.tabWidget_2.setTabText(self.tabWidget_2.indexOf(self.tab_Statistics), _translate("MainWindow", "Statistics"))
        self.tabWidget_3.setTabText(self.tabWidget_3.indexOf(self.tab_History), _translate("MainWindow", "History"))
        self.menuFile.setTitle(_translate("MainWindow", "File"))
        self.menuEdit.setTitle(_translate("MainWindow", "Edit"))
        self.menuImages.setTitle(_translate("MainWindow", "Images"))
        self.menuWindow.setTitle(_translate("MainWindow", "Window"))
        self.menuHelp.setTitle(_translate("MainWindow", "Help"))
        self.TopToolBar.setWindowTitle(_translate("MainWindow", "toolBar_2"))
        self.LeftToolBar.setWindowTitle(_translate("MainWindow", "toolBar"))
        self.actionNew.setText(_translate("MainWindow", "New"))
        self.actionOpen.setText(_translate("MainWindow", "Open"))


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_())

主窗口功能

import sys
import os
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from Main_GUI import *
from GraphicsArea import *

    class MainWindow(QMainWindow):

    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        QWidget.__init__(self,parent)
        self.MainUi = Ui_MainWindow()
        self.MainUi.setupUi(self)
        self.setUpMainUiFunction()


    def setUpMainUiFunction(self):
        self.MainUi.actionOpen.triggered.connect(self.OpenDialog)
        self.MainUi.Button_LoadPhoto.clicked.connect(self.OpenDialog)

        open = QAction(QIcon("icons/open.bmp"),"open",self)
        save = QAction(QIcon("icons/save.bmp"),"save",self)
        NormalCursor = QAction(QIcon("icons/cursor-normal.png"),"NormalCursor",self)
        CrosshairCursor = QAction(QIcon("icons/crosshair.png"),"CrosshairCursor",self)


        self.MainUi.TopToolBar.addAction(open)
        self.MainUi.TopToolBar.addAction(save)
        self.MainUi.LeftToolBar.addAction(NormalCursor)
        self.MainUi.LeftToolBar.addAction(CrosshairCursor)

        self.MainUi.TopToolBar.actionTriggered[QAction].connect(self.toolbtnpressed)




    def OpenDialog(self):
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog


        fileToOpen, _ = QFileDialog.getOpenFileNames(self,"Open File", "","JPEG Files (*.jpeg)", options=options)

        pixmap = QtGui.QPixmap(fileToOpen[0])

        self.showPicture(pixmap,pixmap.size().width(),pixmap.size().height())

        self.MainUi.statusbar.showMessage("Successfully Loaded: "+ fileToOpen[0])



    def showPicture(self,picture,width,height):
        sub = QtWidgets.QMdiSubWindow()
        self.Load_Picture = LoadPicture()

        sub.setWidget(self.Load_Picture)

        sub.setObjectName("Load_Picture_window")
        sub.setWindowTitle("New Photo")
        self.MainUi.mdiArea.addSubWindow(sub)

        self.Load_Picture.setpicture(picture)
        self.Load_Picture.MousePositionSignal.connect(self.PixelValueUpdate)

        self.PictureWidth = width
        self.PictureHeight = height

        sub.resize(width/.92,self.MainUi.mdiArea.geometry().height())

        sub.show()
        self.NewPicture = picture.toImage()


    def PixelValueUpdate(self,Coordinates):
        if  Coordinates.x():
            R,G,B = QColor(self.NewPicture.pixel(Coordinates.x(),Coordinates.y())).getRgb()[:-1] 
            self.MainUi.UserInput_PixelValue_X.setText(str(Coordinates.x()))
            self.MainUi.UserInput_PixelValue_Y.setText(str(Coordinates.y()))

            self.MainUi.UserInput_PixelValue_R.setText(str(R))
            self.MainUi.UserInput_PixelValue_G.setText(str(G))
            self.MainUi.UserInput_PixelValue_B.setText(str(B))

            QApplication.setOverrideCursor(Qt.CrossCursor)
            self.UpdateStatueBar(Coordinates)
        else:
            QApplication.setOverrideCursor(Qt.ArrowCursor)

if __name__ == "__main__":
    os.environ["QT_AUTO_SCREEN_SCALE_FACTOR"] = "1"
    pyqtRemoveInputHook()
    app = QtWidgets.QApplication(sys.argv)
    app.setAttribute(Qt.AA_EnableHighDpiScaling,True)
    screen_resolution = app.desktop().screenGeometry()
    width, height = screen_resolution.width()/1.5, screen_resolution.height()/1.2
    MainWindow = MainWindow()
    MainWindow.resize(width,height)
    MainWindow.setWindowTitle('Figure out name later')
    MainWindow.show()
    sys.exit(app.exec_())

打開照片的主窗口的屏幕截圖

MDI 窗口打開時主窗口的屏幕截圖

這是我稱為 GraphicsArea_GUI.py 的小部件的代碼

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_GraphicsArea(object):
    def setupUi(self, GraphicsArea):
        GraphicsArea.setObjectName("GraphicsArea")
        GraphicsArea.resize(400, 300)
        self.gridLayout = QtWidgets.QGridLayout(GraphicsArea)
        self.gridLayout.setObjectName("gridLayout")
        self.scrollArea = QtWidgets.QScrollArea(GraphicsArea)
        self.scrollArea.setWidgetResizable(True)
        self.scrollArea.setObjectName("scrollArea")
        self.scrollAreaWidgetContents = QtWidgets.QWidget()
        self.scrollAreaWidgetContents.setGeometry(QtCore.QRect(0, 0, 380, 280))
        self.scrollAreaWidgetContents.setObjectName("scrollAreaWidgetContents")
        self.gridLayout_2 = QtWidgets.QGridLayout(self.scrollAreaWidgetContents)
        self.gridLayout_2.setContentsMargins(0, 0, 0, 0)
        self.gridLayout_2.setObjectName("gridLayout_2")
        self.PictureArea = QtWidgets.QGraphicsView(self.scrollAreaWidgetContents)
        self.PictureArea.setObjectName("PictureArea")
        self.gridLayout_2.addWidget(self.PictureArea, 0, 0, 1, 1)
        self.scrollArea.setWidget(self.scrollAreaWidgetContents)
        self.gridLayout.addWidget(self.scrollArea, 0, 0, 1, 1)

        self.retranslateUi(GraphicsArea)
        QtCore.QMetaObject.connectSlotsByName(GraphicsArea)

    def retranslateUi(self, GraphicsArea):
        _translate = QtCore.QCoreApplication.translate
        GraphicsArea.setWindowTitle(_translate("GraphicsArea", "Form"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    GraphicsArea = QtWidgets.QWidget()
    ui = Ui_GraphicsArea()
    ui.setupUi(GraphicsArea)
    GraphicsArea.show()
    sys.exit(app.exec_())

將顯示照片的 MDI 窗口

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from GraphicsArea_GUI import *

class LoadPicture(QWidget):
    MousePositionSignal = pyqtSignal(object)
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)

        self.GraphicAreaGUI = Ui_GraphicsArea()
        self.GraphicAreaGUI.setupUi(self)
        self.setUpLoadInputUi()
        self.GraphicAreaGUI.PictureArea.viewport().installEventFilter(self)


    def setUpLoadInputUi(self):
        pass
        self.scene=QGraphicsScene()
        self.pixitem=QGraphicsPixmapItem()
        self.grali=[]

    def setpicture(self,pixmap):
        self.pixitem.setPixmap(pixmap)
        self.grali.append(self.pixitem)
        self.scene.addItem(self.grali[-1])
        self.GraphicAreaGUI.PictureArea.setScene(self.scene)
        self.GraphicAreaGUI.PictureArea.show()
        self.GraphicAreaGUI.PictureArea.setMouseTracking(True)



    def eventFilter(self, source, event):
        if (event.type() == QEvent.MouseMove and
            source is self.GraphicAreaGUI.PictureArea.viewport()):
            self.MousePositionSignal.emit(event)
        return QWidget.eventFilter(self, source, event)

1 個解決方案

解決方案1
 1 已采納  2017-11-02 01:41:11

滾動滾動條時會得到錯誤的值，因為坐標與窗口相關，而不是圖像，要以簡單的方式獲取正確的坐標是覆蓋QGraphicsPixmapItem的hoverMoveEvent方法，因此我們創建了一個繼承的類。 問題是QGraphicsItem不是從QObject繼承的，因此它們不能發出信號，一個簡單的解決方案是創建一個發出信號的類並將其傳遞給自定義QGraphicsPixmapItem類的實例。

class LogObject(QObject):
    MousePixmapSignal = pyqtSignal(QPoint, QColor)


class PictureItem(QGraphicsPixmapItem):
    def __init__(self, log, *args, **kwargs):
        QGraphicsPixmapItem.__init__(self, *args, **kwargs)
        self.setAcceptHoverEvents(True)
        self.log = log

    def hoverMoveEvent(self, event):
        point = event.pos().toPoint()
        color = QColor(self.pixmap().toImage().pixel(point.x(), point.y()))
        self.log.MousePixmapSignal.emit(point, color)
        QGraphicsPixmapItem.hoverMoveEvent(self, event)

    def hoverEnterEvent(self, event):
        QApplication.setOverrideCursor(Qt.CrossCursor)
        QGraphicsPixmapItem.hoverMoveEvent(self, event)

    def hoverLeaveEvent(self, event):
        QApplication.setOverrideCursor(Qt.ArrowCursor)
        QGraphicsPixmapItem.hoverLeaveEvent(self, event)


class LoadPicture(QWidget, Ui_GraphicsArea):
    def __init__(self, pixmap, parent=None):
        QWidget.__init__(self, parent)
        self.setupUi(self)
        self.log = LogObject(self)
        self.PictureArea.setScene(QGraphicsScene())
        self.item = PictureItem(self.log, pixmap)
        self.PictureArea.scene().addItem(self.item)
        self.resize(pixmap.size())

然后在必要時創建對象，我們連接必要的元素：

class MainWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, *args, **kwargs):
        QMainWindow.__init__(self, *args, **kwargs)
        self.setupUi(self)
        self.setUpMainUiFunction()

    def setUpMainUiFunction(self):
        self.actionOpen.triggered.connect(self.OpenDialog)
        self.Button_LoadPhoto.clicked.connect(self.OpenDialog)

        open = QAction(QIcon("icons/open.bmp"), "open", self)
        save = QAction(QIcon("icons/save.bmp"), "save", self)
        NormalCursor = QAction(QIcon("icons/cursor-normal.png"), "NormalCursor", self)
        CrosshairCursor = QAction(QIcon("icons/crosshair.png"), "CrosshairCursor", self)

        self.TopToolBar.addAction(open)
        self.TopToolBar.addAction(save)
        self.LeftToolBar.addAction(NormalCursor)
        self.LeftToolBar.addAction(CrosshairCursor)

        # self.TopToolBar.actionTriggered[QAction].connect(self.toolbtnpressed)

    def OpenDialog(self):
        options = QFileDialog.Options()
        options |= QFileDialog.DontUseNativeDialog
        PicturePath = QStandardPaths.standardLocations(QStandardPaths.PicturesLocation)[0]
        filenames, _ = QFileDialog.getOpenFileNames(self, "Open File", PicturePath, "JPEG File (*.png)", options=options)
        for filename in filenames:
            pixmap = QPixmap(filename)
            self.showPicture(pixmap)
            self.statusbar.showMessage("Successfully Loaded: {}".format(filename))

    def showPicture(self, picture):
        sub = QMdiSubWindow(self)
        loadPicture = LoadPicture(picture, sub)
        sub.setWidget(loadPicture)
        sub.setObjectName("Load_Picture_window")
        sub.setWindowTitle("New Photo")
        self.mdiArea.addSubWindow(sub)
        sub.show()
        sub.resize(picture.size())
        loadPicture.log.MousePixmapSignal.connect(self.updatePixel)

    def updatePixel(self, point, color):
        self.UserInput_PixelValue_X.setText("{}".format(point.x()))
        self.UserInput_PixelValue_Y.setText("{}".format(point.y()))

        self.UserInput_PixelValue_R.setText("{}".format(color.red()))
        self.UserInput_PixelValue_G.setText("{}".format(color.green()))
        self.UserInput_PixelValue_B.setText("{}".format(color.blue()))

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