Python 链接两个qgraphicsview对象之间的缩放
我正在尝试链接两个qgraphicsview对象，以便当一个窗口放大时，另一个qgraphicsview也会放大。我试图通过在一个窗口要缩放时调用test函数来实现这一点。然后我尝试在另一个qgraphicsview对象中调用self.scale（factor，factor）。我得到一个错误：AttributeError:“PhotoViewer”对象没有属性“viewer”。我试图调用类ui self.viewer，但从错误判断，我仍然在Photoviewer对象中。当一个窗口被放大时，如何从中调用其他窗口self.scale？提前谢谢Python 链接两个qgraphicsview对象之间的缩放,python,pyqt5,qgraphicsview,Python,Pyqt5,Qgraphicsview,我正在尝试链接两个qgraphicsview对象，以便当一个窗口放大时，另一个qgraphicsview也会放大。我试图通过在一个窗口要缩放时调用test函数来实现这一点。然后我尝试在另一个qgraphicsview对象中调用self.scale（factor，factor）。我得到一个错误：AttributeError:“PhotoViewer”对象没有属性“viewer”。我试图调用类ui self.viewer，但从错误判断，我仍然在Photoviewer对象中。当一个窗口被放大时，如何从
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import Qt, QPoint
from PyQt5.QtWidgets import QMainWindow, QApplication
from PyQt5.QtGui import QPixmap, QPainter, QPen
import sys
class PhotoViewer(QtWidgets.QGraphicsView):
photoClicked = QtCore.pyqtSignal(QtCore.QPoint)
def __init__(self, parent,num_view):
super(PhotoViewer, self).__init__(parent)
#to track which viewer
self.num_view=num_view
self.drawmode=0
self._zoom = 0
self.drawing = False
self.lastPoint = QPoint()
self.image=False
self.image=QPixmap(r"image.jpg")
self._empty = True
self._scene = QtWidgets.QGraphicsScene(self)
self._photo = QtWidgets.QGraphicsPixmapItem()
self._scene.addItem(self._photo)
self.setScene(self._scene)
self.setTransformationAnchor(QtWidgets.QGraphicsView.AnchorUnderMouse)
self.setResizeAnchor(QtWidgets.QGraphicsView.AnchorUnderMouse)
self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.setBackgroundBrush(QtGui.QBrush(QtGui.QColor(30, 30, 30)))
self.setFrameShape(QtWidgets.QFrame.NoFrame)
def hasPhoto(self):
return not self._empty
def fitInView(self, scale=True):
rect = QtCore.QRectF(self._photo.pixmap().rect())
if not rect.isNull():
self.setSceneRect(rect)
if self.hasPhoto():
unity = self.transform().mapRect(QtCore.QRectF(0, 0, 1, 1))
self.scale(1 / unity.width(), 1 / unity.height())
viewrect = self.viewport().rect()
scenerect = self.transform().mapRect(rect)
factor = min(viewrect.width() / scenerect.width(),
viewrect.height() / scenerect.height())
self.scale(factor, factor)
self._zoom = 0
def setPhoto(self, pixmap=None):
self._zoom = 0
if pixmap and not pixmap.isNull():
self._empty = False
self.setDragMode(QtWidgets.QGraphicsView.ScrollHandDrag)
self._photo.setPixmap(pixmap)
else:
self._empty = True
self.setDragMode(QtWidgets.QGraphicsView.NoDrag)
self._photo.setPixmap(QtGui.QPixmap())
self.fitInView()
def wheelEvent(self, event):
if self.hasPhoto():
if event.angleDelta().y() > 0:
factor = 1.25
self._zoom += 1
else:
factor = 0.8
self._zoom -= 1
if self._zoom > 0:
ui.test(self,self.num_view,factor)
self.scale(factor, factor)
elif self._zoom == 0:
self.fitInView()
else:
self._zoom = 0
def toggleDragMode(self):
if self.dragMode() == QtWidgets.QGraphicsView.ScrollHandDrag:
self.setDragMode(QtWidgets.QGraphicsView.NoDrag)
elif not self._photo.pixmap().isNull():
self.setDragMode(QtWidgets.QGraphicsView.ScrollHandDrag)
class ui(QtWidgets.QWidget):
def __init__(self):
super(ui, self).__init__()
self.viewer = PhotoViewer(self,1)
self.viewer2 = PhotoViewer(self,2)
# 'Load image' button
self.btnLoad = QtWidgets.QToolButton(self)
self.btnLoad.setText('Load image')
self.btnLoad.clicked.connect(self.loadImage)
# draw mode
self.btndraw = QtWidgets.QToolButton(self)
self.btndraw.setText('Draw Mode')
self.btndraw.clicked.connect(self.drawmode)
# Button to change from drag/pan to getting pixel info
self.btnPixInfo = QtWidgets.QToolButton(self)
self.btnPixInfo.setText('Enter pixel info mode')
self.btnPixInfo.clicked.connect(self.pixInfo)
self.editPixInfo = QtWidgets.QLineEdit(self)
self.editPixInfo.setReadOnly(True)
self.viewer.photoClicked.connect(self.photoClicked)
# Arrange layout
VBlayout = QtWidgets.QVBoxLayout(self)
HBlayout2 = QtWidgets.QHBoxLayout()
HBlayout2.setAlignment(QtCore.Qt.AlignLeft)
HBlayout2.addWidget(self.viewer2)
HBlayout2.addWidget(self.viewer)
HBlayout = QtWidgets.QHBoxLayout()
HBlayout.setAlignment(QtCore.Qt.AlignLeft)
HBlayout.addWidget(self.btnLoad)
HBlayout.addWidget(self.btnPixInfo)
HBlayout.addWidget(self.btndraw)
HBlayout.addWidget(self.editPixInfo)
VBlayout.addLayout(HBlayout2)
VBlayout.addLayout(HBlayout)
#scroll bars
self.viewer.horizontalScrollBar().valueChanged.connect(self.horizontal_scroll)
self.viewer.verticalScrollBar().valueChanged.connect(self.vertical_scroll)
self.viewer2.horizontalScrollBar().valueChanged.connect(self.horizontal_scroll2)
self.viewer2.verticalScrollBar().valueChanged.connect(self.vertical_scroll2)
def test(self,num,factor):
if num==1:
self.viewer2.scale(factor,factor)
if num==2:
self.viewer.scale(factor,factor)
#auto scroll
def horizontal_scroll(self):
self.viewer2.horizontalScrollBar().setValue(self.viewer.horizontalScrollBar().value())
def horizontal_scroll2(self):
self.viewer.horizontalScrollBar().setValue(self.viewer2.horizontalScrollBar().value())
def vertical_scroll(self):
self.viewer2.verticalScrollBar().setValue(self.viewer.verticalScrollBar().value())
def vertical_scroll2(self):
self.viewer.verticalScrollBar().setValue(self.viewer2.verticalScrollBar().value())
def loadImage(self):
self.viewer.setPhoto(QtGui.QPixmap(r'temp.png'))
self.viewer2.setPhoto(QtGui.QPixmap(r'temp.png'))
self.image=QPixmap(r"image.jpg")
def drawmode(self):
self.viewer.toggleDrawMode()
def pixInfo(self):
self.viewer.toggleDragMode()
def photoClicked(self, pos):
if self.viewer.dragMode() == QtWidgets.QGraphicsView.NoDrag:
self.editPixInfo.setText('%d, %d' % (pos.x(), pos.y()))
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
window = ui()
window.setGeometry(500, 300, 800, 600)
window.show()
sys.exit(app.exec_())
您可以使用以下信号，而不是直接缩放视图： 将以下代码添加到PhotoViewer：
class PhotoViewer(QtWidgets.QGraphicsView):
scaled = QtCore.pyqtSignal(int, int, QtGui.QTransform, int)
....
def scale(self, horz, vert):
super().scale(horz, vert)
self.scaled.emit(self.horizontalScrollBar().value(),
self.verticalScrollBar().value(),
self.transform(),
self._zoom
)
def set_transform(self, horz_scroll, vert_scroll, transform, zoom):
# temporary block signals from scroll bars to prevent interference
horz_blocked = self.horizontalScrollBar().blockSignals(True)
vert_blocked = self.verticalScrollBar().blockSignals(True)
self._zoom = zoom
self.setTransform(transform)
dx = horz_scroll - self.horizontalScrollBar().value()
dy = vert_scroll - self.verticalScrollBar().value()
self.horizontalScrollBar().setValue(dx)
self.verticalScrollBar().setValue(dy)
self.horizontalScrollBar().blockSignals(horz_blocked)
self.verticalScrollBar().blockSignals(vert_blocked)
uiclass ui(QtWidgets.QWidget):
def __init__(self):
....
self.viewer.scaled.connect(self.viewer2.set_transform)
self.viewer2.scaled.connect(self.viewer.set_transform)
同时删除对
ui.test（）PhotoViewer.wheeleeventclass PhotoViewer(QtWidgets.QGraphicsView):
scaled = QtCore.pyqtSignal(int, int, QtGui.QTransform, int)
....
def scale(self, horz, vert):
super().scale(horz, vert)
self.scaled.emit(self.horizontalScrollBar().value(),
self.verticalScrollBar().value(),
self.transform(),
self._zoom
)
def set_transform(self, horz_scroll, vert_scroll, transform, zoom):
# temporary block signals from scroll bars to prevent interference
horz_blocked = self.horizontalScrollBar().blockSignals(True)
vert_blocked = self.verticalScrollBar().blockSignals(True)
self._zoom = zoom
self.setTransform(transform)
dx = horz_scroll - self.horizontalScrollBar().value()
dy = vert_scroll - self.verticalScrollBar().value()
self.horizontalScrollBar().setValue(dx)
self.verticalScrollBar().setValue(dy)
self.horizontalScrollBar().blockSignals(horz_blocked)
self.verticalScrollBar().blockSignals(vert_blocked)
uiclass ui(QtWidgets.QWidget):
def __init__(self):
....
self.viewer.scaled.connect(self.viewer2.set_transform)
self.viewer2.scaled.connect(self.viewer.set_transform)
ui.test（）PhotoViewer.wheeleevent