In this article, we will see how we can get X & Y coordinates of the line i.e origin of the line of line graph in the PyQtGraph module. 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 line chart or line plot or line graph or curve chart is a type of chart that displays information as a series of data points called ‘markers’ connected by straight line segments. It is a basic type of chart common in many fields. The line graph is created with the help of plot class in PyQtGraph. X and Y are the positions of the line corresponding to the respective axis. It can be set with the help of setX and setY methods.
We can create a plot window and create lines on it with the help of commands given below.
# creating a pyqtgraph plot window plt = pg.plot() # ploting line in green color # with dot symbol as x, not a mandatory field line = plt.plot(x, y, pen='g', symbol='x', symbolPen='g', symbolBrush=0.2, name='green')
In order to do this we use x and y methods with the line object
Syntax : line.x() and line.y()
Argument : It takes no argument
Return : It returns float value
Below is the implementation.
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