If you're looking to create QGIS plugins, then you've come to the right place! In this step-by-step guide, we'll show you how to create your own plugin by creating essential files such as metadata.txt and mainPlugin.py, as well as how to use Python to create the init.py file. We'll also walk you through how to install your plugin and provide a tip on using the Plugin Builder to create a template for your plugin. Follow these instructions to create your own QGIS plugin and take your GIS analysis to the next level!
The first requirement for plugins is metadata.txt.
Use a text editor to create a metadata file:
[general] name=TestPlugin email@example.com author=Azad Rasul qgisMinimumVersion=3.0 description=This is an example plugin for greeting the world. version=version 0.1
Save it as a "metadata" text document.
The second file is called "__init__.py" which includes the classFactory() method.
You can use Python to create a "__init__.py" file
from .mainPlugin import TestPlugin def classFactory(iface): return TestPlugin(iface)
The third necessary file contains the main logic of the plugin. It must have initGui(), unload() and run() methods. We name it "mainPlugin.py" file that includes:
import os import inspect from PyQt5.QtWidgets import QAction from PyQt5.QtGui import QIcon # get the directory containing this script cmd_folder = os.path.split(inspect.getfile(inspect.currentframe())) # define the TestPlugin class class TestPlugin: def __init__(self, iface): self.iface = iface # initialize the plugin interface def initGui(self): # get the path to the plugin icon icon = os.path.join(os.path.join(cmd_folder, 'logo.png')) # create a new QAction with the plugin icon and label self.action = QAction(QIcon(icon), 'TestPlugin', self.iface.mainWindow()) # connect the action to the run() method self.action.triggered.connect(self.run) # add the action to the toolbar and menu self.iface.addToolBarIcon(self.action) self.iface.addPluginToMenu("&TestPlugin", self.action) # unload the plugin def unload(self): # remove the action from the toolbar and menu self.iface.removePluginMenu("&TestPlugin", self.action) self.iface.removeToolBarIcon(self.action) # delete the action object del self.action # run the plugin def run(self): # display a message in the QGIS message bar self.iface.messageBar().pushMessage('Hello from TestPlugin!')
Save these three files and a logo in one folder and name it "TestPlugin" or the name of the plugin.
Then, copy the "TestPlugin" folder and paste it into QGIS 3 Plugins directory. On Windows, it is typically located at:
Restart QGIS software, and you will be able to see your "TestPlugin" plugin in the list of installed plugins. By clicking on the TestPlugin icon, you can view the "Hello from TestPlugin!" text.
Alternatively, you can use the "Plugin Builder" to create a template plugin and then modify it to suit your needs.
In conclusion, creating QGIS plugins may seem daunting, but this step-by-step guide can help anyone create their customized plugin. By following the instructions provided, users can create necessary files such as metadata.txt and mainPlugin.py, and use Python to create the init.py file. The article also provides a tip on using the Plugin Builder to create a template for the plugin. With the plugin created and installed, users can take their GIS analysis to the next level.
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