本文介紹了如何渲染 QGraphicsScene 的一部分并將其保存為圖像文件 PyQt5的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
假設我有來自加載圖像的 QGraphicsPixmapItem，它被添加到 QGraphicsScene.假設我將在場景中添加幾個 QGraphicsPolygonItem.如何將場景的一部分渲染為全尺寸圖像，同時使用不在空白區域中的多邊形和保存該區域作為圖像文件.
Suppose I have QGraphicsPixmapItem from loaded image which is added to QGraphicsScene. And suppose I'll add several QGraphicsPolygonItem's on scene. How I can render a part of the scene as full-size image both with polygons that are not in blank area and save this area as image file.
class ImageView(QtWidgets.QGraphicsView):
def __init__(self, parent):
super(ImageView, self).__init__(parent)
self.setFocus()
self._zoom = 0
self._empty = True
self.scene = QtWidgets.QGraphicsScene(self)
self._image = QGraphicsPixmapItem()
self.scene.addItem(self._image)
self.setScene(self.scene)
# some other actions
foo()
def fitInView(self):
# custom fit in view and scaling
bar()
# some other methods
class MainWindow(QtWidgets.QWidget):
def __init__(self):
self.viewer = ImageView(self)
foo()
def _save_image(self):
# method that I need to implement
pass
推薦答案
未經測試，但使用 QGraphicsScene::render 你應該可以做類似...
Untested, but using QGraphicsScene::render you should be able to do something like...
def _save_image(self):
# Get region of scene to capture from somewhere.
area = get_QRect_to_capture_from_somewhere()
# Create a QImage to render to and fix up a QPainter for it.
image = QImage(area.size(), QImage.Format_ARGB32_Premultiplied)
painter = QPainter(image)
# Render the region of interest to the QImage.
self.scene.render(painter, image.rect(), area)
painter.end()
# Save the image to a file.
image.save("capture.png")
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