PyQtGraph - Setting Symbol of Line in Line Graph - GeeksforGeeks
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PyQtGraph – Setting Symbol of Line in Line Graph
In this article we will see how we can set symbols of line in line graph of 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 which 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. Line graph is created with the help of plot class in PyQtGraph. Symbols are the figure of the point which connect the data of the line. It is mainly x, o.
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
setSymbolmethod with the line objectSyntax : line.setSymbol(s)
Argument : It takes string as argument
Return : It returns None
Below is the implementation
# importing Qt widgetsfrom PyQt5.QtWidgets import * import sys# importing pyqtgraph as pgimport pyqtgraph as pgfrom PyQt5.QtGui import *# Bar Graph classclass BarGraphItem(pg.BarGraphItem):# constructor which inherit original# BarGraphItemdef __init__(self, *args, **kwargs):pg.BarGraphItem.__init__(self, *args, **kwargs)# creating a mouse double click eventdef mouseDoubleClickEvent(self, e):# setting scaleself.setScale(0.2)class Window(QMainWindow):def __init__(self):super().__init__()# setting titleself.setWindowTitle("PyQtGraph")# setting geometryself.setGeometry(100, 100, 600, 500)# iconicon = QIcon("skin.png")# setting icon to the windowself.setWindowIcon(icon)# calling methodself.UiComponents()# showing all the widgetsself.show()# method for componentsdef UiComponents(self):# creating a widget objectwidget = QWidget()# creating a new labellabel = QLabel("GeeksforGeeks Line Plot")# making it multilinelabel.setWordWrap(True)# y values to plot by line 1y = [2, 8, 6, 8, 6, 11, 14, 13, 18, 19]# y values to plot by line 2y2 = [3, 1, 5, 8, 9, 11, 16, 17, 14, 16]x = range(0, 10)# create plot window objectplt = pg.plot()# showing x and y gridsplt.showGrid(x = True, y = True)# adding legendplt.addLegend()# set properties of the label for y axisplt.setLabel('left', 'Vertical Values', units ='y')# set properties of the label for x axisplt.setLabel('bottom', 'Horizontal Vlaues', units ='s')# setting horizontal rangeplt.setXRange(0, 10)# setting vertical rangeplt.setYRange(0, 20)# ploting line in green color# with dot symbol as x, not a mandatory fieldline1 = plt.plot(x, y, pen ='g', symbol ='x', symbolPen ='g', symbolBrush = 0.2, name ='green')# ploting line2 with blue color# with dot symbol as oline2 = plt.plot(x, y2, pen ='b', symbol ='o', symbolPen ='b', symbolBrush = 0.2, name ='blue')# setting symbol of the line 1line1.setSymbol('o')# label minimum widthlabel.setMinimumWidth(120)# Creating a grid layoutlayout = QGridLayout()# setting this layout to the widgetwidget.setLayout(layout)# adding label to the layoutlayout.addWidget(label, 1, 0)# plot window goes on right side, spanning 3 rowslayout.addWidget(plt, 0, 1, 3, 1)# setting this widget as central widget of the main widowself.setCentralWidget(widget)# create pyqt5 appApp = QApplication(sys.argv)# create the instance of our Windowwindow = Window()# start the appsys.exit(App.exec())Output :
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