Qt Snippet: Create QPixmap with transparent background

If you want to create a QPixamp object with transparent background you simply need to fill the entire area with transparent color immediately after created. After doing this you can start to draw over.



QPixmap MyPixmap(QSize(32,32));

MyPixmap.fill(Qt::transparent);

// Now you can draw into
// .......

If you want to know how to draw into a QPixmap check this post.

Comments

Post a Comment

Popular posts from this blog

Access GPIO from Linux user space

Image
GPIO mean "General Purpose Input/Output" and is a special pin present in some chip that can be set as input or output and used to move a signal high or low (in output mode) or to get the signal current status (in input mode). Usually these pin are directly managed by kernel modules but there are an easy way to manage these pins also from user space.
Read more

Android: adb push and read-only file system error

Image
If you want to copy a file from your PC to the connected android device the fasten way is to use adb tool with push command. This command get as params the path of the local file and the remote path to copy in the device. Sometimes, especially if you use adb from Windows or MacOS, and error about read-only file system show up and you can not copy any file.
Read more

Tree in SQL database: The Nested Set Model

Image
Tree structure are very commonly used by all the application who need to manage a large quantity of data. However once have in memory the tree data the application need a way to save them for future use. SQL database can be a good solution but, in this case, we need a way to store data in efficient mode. This post will propose a model called Nested Set.
Read more