python - 适合 QGraphisItem 在视图中
问题描述
是一种适合任何图像的方法(我在 QPixmap 中导入)并保持纵横比>。我尝试了很多解决方案,但都没有。另外我不确定我需要适合什么?QGraphicsView中的QGraphicsScene?还是 QGraphicsView 中的 QPixmap?
from PyQt5 import QtCore, QtGui, QtWidgets
class GraphicsView(QtWidgets.QGraphicsView):
def __init__(self, parent=None):
super(GraphicsView, self).__init__(parent)
scene = QtWidgets.QGraphicsScene()
self.setScene(scene)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = GraphicsView()
photo = QtGui.QPixmap("image.jpg")
w.scene().addPixmap(photo)
w.resize(640, 480)
w.show()
sys.exit(app.exec_())
解决方案
你必须在fitInView()
QGraphicsView的resizeEvent()
方法中使用QGraphicsView的方法:
from PyQt5 import QtCore, QtGui, QtWidgets
class GraphicsView(QtWidgets.QGraphicsView):
def __init__(self, parent=None):
super(GraphicsView, self).__init__(parent)
scene = QtWidgets.QGraphicsScene(self)
self.setScene(scene)
self.m_pixmap_item = self.scene().addPixmap(QtGui.QPixmap())
def setPixmap(self, pixmap):
self.m_pixmap_item.setPixmap(pixmap)
def resizeEvent(self, event):
if not self.m_pixmap_item.pixmap().isNull():
self.fitInView(self.m_pixmap_item, QtCore.Qt.KeepAspectRatio)
super(GraphicsView, self).resizeEvent(event)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = GraphicsView()
photo = QtGui.QPixmap("image.jpg")
w.setPixmap(photo)
w.resize(640, 480)
w.show()
sys.exit(app.exec_())