When you add a pixmap to a scene using addPixmap, only the current pixmap is used. Further changes will not affect the scene. So you should call addPixmap after you make changes. Also you need to destroy QPainter before you use the pixmap to ensure that all changes will be written to the pixmap and to avoid memory leak.

2012年2月19日 · QPixmap QPixmap.scaled (self, int width, int height, Qt.AspectRatioMode aspectRatioMode = Qt.IgnoreAspectRatio, Qt.TransformationMode transformMode = Qt.FastTransformation) Return type of this function is QPixmap , so it …

2013年4月10日 · The Widget we should use to show pictures is a QLabel. we can do it directly from QtCreator, by setting its pixmap property. we should first create a resource file and then add the image to that resource file. To create a Qt Resource File, we go to the menus: File > Qt > Qt Resource File. we can set the image of the QLabel using Qt Creator...

I want to set an image on QPushButton, and the size of QPushButton should depend on the size of the image. I am able to do this when using QLabel, but not with QPushButton. So, if anyone has a sol...

2012年6月12日 · QPixmap pixmap(<image path>); QByteArray bytes; QBuffer buffer(&bytes); buffer.open(QIODevice::WriteOnly); pixmap.save(&buffer, "PNG"); // writes pixmap into bytes in PNG format After writing the buffer to a file, I want to be able to retrieve the QByteArray and load it back into a QPixmap using the QPixmap::loadFromData() function.

2016年12月16日 · I am write a paint program. pix = QPixmap(600,500); // set size to 600X500 How to change size after this? Someting like: pix.setSize(800,600); // Change size to 800X

There is a nice series of articles at Qt Labs that explains a lot about the Qt graphics system. This article in particular has a section on QImage vs. QPixmap. Here's a short summary that usually (not always) applies: If you plan to manipulate an image, modify it, change pixels on it, etc., use a …

2016年5月12日 · How would you suggest to handle svg with QPixmap? The construct QPixmap(":/myfile.svg"); then call of scaled() does not work. The QPixmap gets pixelised. Thx.

How to get RGB values of QPixmap or QImage pixel - Qt, PyQt. Ask Question Asked 13 years, 1 month ago.

2015年4月1日 · I have some problems with drawing image on QWidget with QPainter from resources. I'm sure I'm missing something but I really dont know what. If I use absolute path, it works fine. So my question is: