Я пытаюсь собрать воедино Python-код для просмотра изображений Python-кода из различных источников и расширить возможности для обрезки областей интереса (ROI) в загруженных изображениях.Проблема заключается в том, что при определении местоположения в пикселях сопоставленные координаты и щелчки мыши учитывают полосу прокрутки и строку меню.Ниже приведен код, который загружает изображение и предоставляет возможность ограничивающего прямоугольника, но я не могу точно нарисовать / обрезать прямоугольники из-за смещения.
from PyQt5.QtCore import QDir, Qt
from PyQt5.QtGui import QImage, QPainter, QPalette, QPixmap
from PyQt5.QtWidgets import (QAction, QApplication, QFileDialog, QLabel,
QMainWindow, QMenu, QMessageBox, QScrollArea, QSizePolicy)
from PyQt5.QtPrintSupport import QPrintDialog, QPrinter
class ImageViewer(QMainWindow):
def __init__(self):
super(ImageViewer, self).__init__()
self.printer = QPrinter()
self.scaleFactor = 0.0
self.imageLabel = QLabel()
self.imageLabel.setBackgroundRole(QPalette.Base)
self.imageLabel.setSizePolicy(QSizePolicy.Ignored, QSizePolicy.Ignored)
self.imageLabel.setScaledContents(True)
self.scrollArea = QScrollArea()
self.scrollArea.setBackgroundRole(QPalette.Dark)
self.scrollArea.setWidget(self.imageLabel)
self.setCentralWidget(self.scrollArea)
self.createActions()
self.createMenus()
self.setWindowTitle("Image Viewer")
self.resize(500, 400)
def open(self):
fileName, _ = QFileDialog.getOpenFileName(self, "Open File",
QDir.currentPath())
if fileName:
image = QImage(fileName)
if image.isNull():
QMessageBox.information(self, "Image Viewer",
"Cannot load %s." % fileName)
return
self.imageLabel.setPixmap(QPixmap.fromImage(image))
self.scaleFactor = 1.0
self.printAct.setEnabled(True)
self.fitToWindowAct.setEnabled(True)
self.updateActions()
if not self.fitToWindowAct.isChecked():
self.imageLabel.adjustSize()
def print_(self):
dialog = QPrintDialog(self.printer, self)
if dialog.exec_():
painter = QPainter(self.printer)
rect = painter.viewport()
size = self.imageLabel.pixmap().size()
size.scale(rect.size(), Qt.KeepAspectRatio)
painter.setViewport(rect.x(), rect.y(), size.width(), size.height())
painter.setWindow(self.imageLabel.pixmap().rect())
painter.drawPixmap(0, 0, self.imageLabel.pixmap())
def zoomIn(self):
self.scaleImage(1.25)
def zoomOut(self):
self.scaleImage(0.8)
def normalSize(self):
self.imageLabel.adjustSize()
self.scaleFactor = 1.0
def fitToWindow(self):
fitToWindow = self.fitToWindowAct.isChecked()
self.scrollArea.setWidgetResizable(fitToWindow)
if not fitToWindow:
self.normalSize()
self.updateActions()
def about(self):
QMessageBox.about(self, "About Image Viewer",
"<p>The <b>Image Viewer</b> example shows how to combine "
"QLabel and QScrollArea to display an image. QLabel is "
"typically used for displaying text, but it can also display "
"an image. QScrollArea provides a scrolling view around "
"another widget. If the child widget exceeds the size of the "
"frame, QScrollArea automatically provides scroll bars.</p>"
"<p>The example demonstrates how QLabel's ability to scale "
"its contents (QLabel.scaledContents), and QScrollArea's "
"ability to automatically resize its contents "
"(QScrollArea.widgetResizable), can be used to implement "
"zooming and scaling features.</p>"
"<p>In addition the example shows how to use QPainter to "
"print an image.</p>")
def createActions(self):
self.openAct = QAction("&Open...", self, shortcut="Ctrl+O",
triggered=self.open)
self.printAct = QAction("&Print...", self, shortcut="Ctrl+P",
enabled=False, triggered=self.print_)
self.exitAct = QAction("E&xit", self, shortcut="Ctrl+Q",
triggered=self.close)
self.zoomInAct = QAction("Zoom &In (25%)", self, shortcut="Ctrl++",
enabled=False, triggered=self.zoomIn)
self.zoomOutAct = QAction("Zoom &Out (25%)", self, shortcut="Ctrl+-",
enabled=False, triggered=self.zoomOut)
self.normalSizeAct = QAction("&Normal Size", self, shortcut="Ctrl+S",
enabled=False, triggered=self.normalSize)
self.fitToWindowAct = QAction("&Fit to Window", self, enabled=False,
checkable=True, shortcut="Ctrl+F", triggered=self.fitToWindow)
self.aboutAct = QAction("&About", self, triggered=self.about)
self.aboutQtAct = QAction("About &Qt", self,
triggered=QApplication.instance().aboutQt)
def createMenus(self):
self.fileMenu = QMenu("&File", self)
self.fileMenu.addAction(self.openAct)
self.fileMenu.addAction(self.printAct)
self.fileMenu.addSeparator()
self.fileMenu.addAction(self.exitAct)
self.viewMenu = QMenu("&View", self)
self.viewMenu.addAction(self.zoomInAct)
self.viewMenu.addAction(self.zoomOutAct)
self.viewMenu.addAction(self.normalSizeAct)
self.viewMenu.addSeparator()
self.viewMenu.addAction(self.fitToWindowAct)
self.helpMenu = QMenu("&Help", self)
self.helpMenu.addAction(self.aboutAct)
self.helpMenu.addAction(self.aboutQtAct)
self.menuBar().addMenu(self.fileMenu)
self.menuBar().addMenu(self.viewMenu)
self.menuBar().addMenu(self.helpMenu)
def updateActions(self):
self.zoomInAct.setEnabled(not self.fitToWindowAct.isChecked())
self.zoomOutAct.setEnabled(not self.fitToWindowAct.isChecked())
self.normalSizeAct.setEnabled(not self.fitToWindowAct.isChecked())
def scaleImage(self, factor):
self.scaleFactor *= factor
self.imageLabel.resize(self.scaleFactor * self.imageLabel.pixmap().size())
self.adjustScrollBar(self.scrollArea.horizontalScrollBar(), factor)
self.adjustScrollBar(self.scrollArea.verticalScrollBar(), factor)
self.zoomInAct.setEnabled(self.scaleFactor < 3.0)
self.zoomOutAct.setEnabled(self.scaleFactor > 0.333)
def adjustScrollBar(self, scrollBar, factor):
scrollBar.setValue(int(factor * scrollBar.value()
+ ((factor - 1) * scrollBar.pageStep()/2)))
def mousePressEvent (self, eventQMouseEvent):
self.originQPoint = self.scrollArea.mapFrom(self, eventQMouseEvent.pos())
#self.originQPoint = eventQMouseEvent.pos()
self.currentQRubberBand = QtWidgets.QRubberBand(QtWidgets.QRubberBand.Rectangle, self)
self.currentQRubberBand.setGeometry(QtCore.QRect(self.originQPoint, QtCore.QSize()))
self.currentQRubberBand.show()
def mouseMoveEvent (self, eventQMouseEvent):
self.x = int(eventQMouseEvent.x())
self.y = int(eventQMouseEvent.y())
text1 = str(self.x)
text2 = str(self.y)
#print(self.x,self.y)
QtWidgets.QToolTip.showText(eventQMouseEvent.pos() , "X: "+text1+" "+"Y: "+text2,self)
if self.currentQRubberBand.isVisible():
self.currentQRubberBand.setGeometry(QtCore.QRect(self.originQPoint, eventQMouseEvent.pos()).normalized() & self.imageLabel.pixmap().rect())
def mouseReleaseEvent (self, eventQMouseEvent):
self.currentQRubberBand.hide()
currentQRect = self.currentQRubberBand.geometry()
self.currentQRubberBand.deleteLater()
cropQPixmap = self.imageLabel.pixmap().copy(currentQRect)
cropQPixmap.save('output.png')
if __name__ == '__main__':
import sys
from PyQt5 import QtGui, QtCore, QtWidgets
app = QApplication(sys.argv)
imageViewer = ImageViewer()
imageViewer.show()
sys.exit(app.exec_())