PyQtGraph – Getting Tool Tip of Scatter Plot Graph - GeeksforGeeks

22 Nov, 2021
In this article, we will see how we can get tool tip of the scatter plot 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 scatter plot (aka scatter chart, scatter graph) uses dots to represent values for two different numeric variables. It is a type of plot or mathematical diagram using Cartesian coordinates to display values for typically two variables for a set of data. The position of each dot on the horizontal and vertical axis indicates values for an individual data point. The tooltip or hint is a common graphical user interface element displayed as an informational text box when hovering over an item. The user hovers the pointer over an item, without clicking it, and a tooltip may appear as a small “hover box” with information about the item being hovered over. t can be set with the help of setToolTip method. We can create a plot window and create a scatter plot graph on it with the help of commands given below.
# creating a pyqtgraph plot window
plt = pg.plot()

# creating a scatter plot graph of size = 10
scatter = pg.ScatterPlotItem(size=10)
In order to do this we use toolTip method with the scatter plot graph objectSyntax : scatter.toolTip()Argument : It takes no argumentReturn : It returns string
Below is the implementation.
Python3
# importing Qt widgetsfrom PyQt5.QtWidgets import * # importing systemimport sys # importing numpy as npimport numpy as np # importing pyqtgraph as pgimport pyqtgraph as pgfrom PyQt5.QtGui import *from PyQt5.QtCore import *  class Window(QMainWindow):     def __init__(self):        super().__init__()         # setting title        self.setWindowTitle("PyQtGraph")         # setting geometry        self.setGeometry(100, 100, 600, 500)         # icon        icon = QIcon("skin.png")         # setting icon to the window        self.setWindowIcon(icon)         # calling method        self.UiComponents()         # showing all the widgets        self.show()     # method for components    def UiComponents(self):         # creating a widget object        widget = QWidget()         # creating a label        label = QLabel("Geeksforgeeks Scatter Plot")         # making label do word wrap        label.setWordWrap(True)         # creating a plot window        plot = pg.plot()         # number of points        n = 300         # creating a scatter plot item        # of size = 10        # using brush to enlarge the of green color        scatter = pg.ScatterPlotItem(            size=10, brush=pg.mkBrush(30, 255, 35, 255))         # data for x-axis        x_data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]         # data for y-axis        y_data = [5, 4, 6, 4, 3, 5, 6, 6, 7, 8]         # setting data to the scatter plot        scatter.setData(x_data, y_data)         # add item to plot window        # adding scatter plot item to the plot window        plot.addItem(scatter)         # Creating a grid layout        layout = QGridLayout()         # minimum width value of the label        label.setMinimumWidth(130)         # setting this layout to the widget        widget.setLayout(layout)         # adding label in the layout        layout.addWidget(label, 1, 0)         # plot window goes on right side, spanning 3 rows        layout.addWidget(plot, 0, 1, 3, 1)         # setting this widget as central widget of the main window        self.setCentralWidget(widget)         # setting tool tip to the scatter plot        scatter.setToolTip("This is tip")         # getting tool tip of scatter plot        value = scatter.toolTip()         # setting text to the value        label.setText("Tool tip : " + str(value))  # create pyqt5 appApp = QApplication(sys.argv) # create the instance of our Windowwindow = Window() # start the appsys.exit(App.exec())
Output :  
 
anikakapoor
Python-gui
Python-PyQtGraph
Python
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