PyQtGraph – Scale Change Signal for Bar Graph
In this article we will see how we can get the scale change signal for the bar 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.) and second is to provide tools to aid in rapid application development (for example, property trees such as used in Qt Designer).A bar chart or bar graph is a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent. The bars can be plotted vertically or horizontally. A vertical bar chart is sometimes called a column chart. Scale is basically the factor which is multiplied with the data of the bar graph, this signal is emitted when scale is changed.
We can create a plot window and bar graph with the help of commands given below
# creating a pyqtgraph plot window window = pg.plot() # creating a bar graph of green color bargraph = pg.BarGraphItem(x=x, height=y1, width=0.6, brush='g')
In order to do this we use
scaleChanged.connectmethod with the bar graph object
Syntax : bargraph.scaleChanged.connect(method)
Argument : It takes method as argument
Return : It returns None
Below is the implementation
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