How to create a simple python add-in for ArcGIS Desktop
TOOL USED: Python Add-in Assistant
WORKING OF THE TOOL:
Creating a Simple python add-in assistant for ArcGIS
Desktop to add a Fishnet table to the ArcMap using the python
Type of Python Add-in: Tool Type
Function: At the end of drawing a rectangle on the
ArcMap a fishnet with specified rows and columns should appear on the Screen
A python add-in tool is
very similar to a button. But, a tool requires user to interact with the map application based
on that interaction some business logic will get executed. The Zoom In tool in ArcMap will be a great example, when the
user draws a rectangle on the ArcMap ,then the map will be redrawn with that
rectangle as an extent.
Below steps will help you
to create both Toolbox as well as a Tool on it
PROCEDURE:
Steps to Create a Toolbar for your Tool:
1. To create your own toolbar. Open the Add-n assistant and Go to
Add-in Contents tab and give the information about
the add-in which you are going to create.
Note: A tool can reside on a Toolbar but cannot sits on a Menu
Note: A tool can reside on a Toolbar but cannot sits on a Menu
2. Click the Add-In Contents tab and begin declaring your add-in
customizations. A tool can reside on a toolbar but not on a menu. See creating
an add-in toolbar for more
detailed procedure.
3. To Create the tool on your new Toolbar
Right-click the new toolbar and choose New Tool on the right click Menu.
Python addin assistant window |
At once you have finished giving out the
information and details about the add-in. Click on Save button at the bottom of the wizard. All the necessary files and
folders will get created within the working folder of your add-in assistant.
Now it is the time to work on the main code. Go
to the python script located on the install folder and open it using your
Python idle. Code will appear as shown below with the class name same as your
button name.
Note: Do not change the button name as it is directly linked with the button and registered in the your Config.xml file
Note: Do not change the button name as it is directly linked with the button and registered in the your Config.xml file
The Onclick () method shown on idle will get executed on when
the user click on the tool . But I our case the fishnet should get created
whenever the user draw the tool is selected and draw an rectangle on the Map.
So to do that OnRectangle () method of the python add-in will comes in to
Picture. Replace on click method with OnRectangle () method as shown below:
Fishnet content added to On Rectangle method |
·
The code will check for any preexistence of fishnet on the
memory using the Exist() Method and deletes if anyone is already there using
the Delete_Management() function.
·
CreateFishnet_management is the core function which is going
to do the actual work after supply all the necessary parameters to it
·
Refresh the active view to redraw the Map and return the path
of the fishnet to the calling function.
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