| shixingya |
2017-12-04 12:45 |
我将多个图元选中，用QGraphicsItemGroup组合它们，想导出png图，还是没有好的思路，求众仙指点
void PaintView::onAssemblageAction(bool)
{
QList<QGraphicsItem *> selectItems=this->scene()->selectedItems();
QGraphicsItemGroup * groupItems =this->scene()->createItemGroup(selectItems);
QRectF rect =groupItems->boundingRect();
QGraphicsScene *scene =new QGraphicsScene();
scene->setSceneRect(rect);
for(int i=0; i<selectItems.count(); i++)
{
QGraphicsItem *sp = qgraphicsitem_cast<QGraphicsItem*>(selectItems);
scene->addItem(sp);
}
scene->clearSelection();
QImage image(rect.width(),rect.height(),QImage::Format_ARGB32);
image.fill(Qt::transparent);//用透明色填充
QString pngName = "D:/scene44test.png";
QPainter painter(&image);
painter.setRenderHint(QPainter::Antialiasing);
scene->render(&painter);
bool saveSuccess = image.save(pngName);
for(int i=0; i<selectItems.count(); i++)
{
QGraphicsItem *sp = qgraphicsitem_cast<QGraphicsItem*>(selectItems);
this->scene()->addItem(sp);
}
if (!saveSuccess)
{
QMessageBox::about(NULL,"","组合图元失败!");
}
else
QMessageBox::about(NULL,"","组合图元成功!");
SafeDelete(scene);
} |
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