我正在学习PyQt5,以开发一个小型学术项目。我需要为QGraphicScene设置背景,但无法使图像很好地适合场景。根据我适用的规模,有时它会被取消或太大。这是我的代码:
class MainWindow(QWidget):
def __init__(self):
super().__init__()
self.title = "title";
self.top = 100
self.left = 100
self.width = 1500
self.height = 900
self.initUI()
def initUI(self):
scene = QGraphicsScene(0, 0, width, heigth)
view = QGraphicsView(scene, self)
image = QImage('pathToImage')
scene.setBackgroundBrush(QBrush(image))
self.setWindowTitle(self.title)
self.setGeometry(self.top, self.left, self.width, self.height)
self.show()
我尝试用以下方法缩放图像
image.scaled(scene.width(), scene.height(), Qt.KeepAspectRatio)
但是它不太适合,实际上有滚动条,因为图像太大。有人知道问题出在哪里吗?
如果要缩放图像,则必须覆盖drawBackground()
方法:
class GraphicsScene(QGraphicsScene):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self._image = QImage()
@property
def image(self):
return self._image
@image.setter
def image(self, img):
if img != self.image:
self._image = img
self.update()
def drawBackground(self, painter, rect):
if self.image.isNull():
super().drawBackground(painter, rect)
else:
painter.drawImage(rect, self.image)
scene = GraphicsScene(self)
scene.image = QImage("pathToImage")
view = QGraphicsView(scene)