In this article we will see how we can set the pen of the graph item in PyQTGaph. PyQtGraph is a graphics and user interface library for Python that provides functionality commonly required in designing and science applications. Its primary goals are to provide fast, interactive graphics for displaying data (plots, video, etc.). A Graph is a non-linear data structure consisting of nodes and edges. The nodes are sometimes also referred to as vertices and the edges are lines or arcs that connect any two nodes in the graph. Graph consists of a finite set of vertices(or nodes) and set of Edges which connect a pair of nodes. Pen is used to draw the line of graph i.e joining edges, by setting pen we can set the color, size and opacity of each line.
We can create a graphic layout widget and graphic item with the help of command given below
# creating graphics layout widget win = pg.GraphicsLayoutWidget() # creating a graph item graph_item = pg.GraphItem()
In order to do this we use setPenmethod with the graph item object
Syntax : imv.setPen(lines)
Argument : It takes numpy array as argument
Return : It returns None
Below is the implementation
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