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我有QGraphicsScene,大小爲62450x4750。有時我需要製作整個場景的截圖並將其保存到文件中。我想是這樣的:Qt 4.8,大QGraphicsScene屏幕截圖
QPixmap wholeScene(scene.sceneRect().size().toSize());
{
QPainter wholeScenePainter(&wholeScene);
scene.render(&wholeScenePainter);
}
// saving pixmap
或
QPixmap wholeScene(scene.sceneRect().size().toSize());
{
QPainter wholeScenePainter(&wholeScene);
int x = 0;
int portion = 32768; //
while(x < scene.sceneRect().width()) {
int width = scene.sceneRect().width() - x > portion ? portion : scene.sceneRect().width() - x;
QRect rect(x, 0, width, scene.sceneRect().height());
scene.render(&wholeScenePainter, rect, rect);
x += width;
}
}
// saving pixmap
或
QPixmap wholeScene(scene.sceneRect().size().toSize());
{
QPainter wholeScenePainter(&wholeScene);
int x = 0;
int portion = 4096;
while(x < scene.sceneRect().width()) {
int width = scene.sceneRect().width() - x > portion ? portion : scene.sceneRect().width() - x;
QRect rect(x, 0, width, scene.sceneRect().height());
QPixmap temp(rect.size());
QPainter p(&temp);
scene.render(&p, QRect(0, 0, rect.width(), rect.height()), rect);
wholeScenePainter.drawPixmap(x,0, temp);
//temp.save(QString("print%1.png").arg(QString::number(x)), "PNG");
x += width;
}
}
// saving pixmap
但每次我得到寬度上的32768像素cuted圖像(像素圖)。
這是正確的做法。 –