The qpen.setJoinStyle() function is a method of the PyQt4.QtGui.QPen class in Python. This function is used to set the join style of a pen, which determines how the corners of paths are rendered in a QPainter. The available join styles include MiterJoin, RoundJoin, and BevelJoin. The MiterJoin style produces sharp corners, the RoundJoin style produces rounded corners, and the BevelJoin style produces flattened corners. By setting the join style, you can customize the appearance of the lines drawn with a pen in your PyQt4 application.
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