• Python Plugin
• Writing Vst Plugins Python Commands

Overview

To get started writing the plug-in, you are going to use an open source Python package I wrote called pathtool, which uses generators to walk a filesystem and yield a file object. This library was specifically written to allow developers to extend it by writing their own filters that do something to a file object, and then return the result. I'm new to ROS and rviz. I want to write a new tool rviz plugin like the one in this tutorial (adding a new tool on the tool bar), but in python rather than C. My plugin tool needs to be able to create a line by dragging the mouse across the display in rviz. (I'm just practicing to write a simple tool here.) I couldn't find any helpful resources or documentations on writing rviz plugin in.

PASW Statistics-Python Integration Plug-in is a Shareware software in the category Miscellaneous developed by SPSS, Inc.

Python Plugin

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PASW Statistics-Python Integration Plug-in runs on the following operating systems: Windows.

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Recently, I had the need to work with a plugin-based architecture, where the plugins needed to be shareable amongst different projects in an easy way. In order to do so, I decided to create a separate python module for each plugin, where the functionality of the plugin was implemented as a class within that module.

Originally, I had the idea that each project should just have one folder where all of these modules with plugins could be located in. However, after using an initial implementation for some time, I decided it would be better if each project would define a base folder under which all plugins would be located but that each plugin could be located in an arbitrary number of subdirectories under this main plugin directory.

Suppose we want to make a really basic system where each plugin will implement a method that applies a function over a given argument. The base Plugin class could then be as follows:

Writing a plugin that performs the identity function would require you to first set the description in the constructor and provide an implementation of the perform_operation method. An example implementation of this is as follows:

Because we want to create a system where we dynamically load the different plugin modules, we will define a new class PluginCollection that will take care of the loading of all plugins and enables the functionality to apply the perform_operation of all plugins on a supplied value. The basic components for this PluginCollection class are as follows:

The final component of this class is the walk_package method. The basic steps in this method are:

1. Look for all modules in the supplied package
2. For each module found, get all classes defined in the module and check if the class is a subclass of Plugin, but not the Plugin class itself. Each class that satisfies these criteria will be instantiated and added to a list. The advantage of this check is that you can still place some other python modules within the same directories and they will not influence the plugin framework.
3. Check all sub-folders within the current package and recurse into these packages to recursively search for plugins.

Items 1 and 2 of the above steps can be implemented with the following code: Best rise and falles vst plugin.

The recursive part of the method is then implemented by calling the same walk_package method again on each subpackage found within the current package. We first build up the list of all current paths (either just the __path__ in case it is a string, or the elements if it is a _Namespace object. After that, we just initiate the recursive call for each of the elements. The complete implementation of the recursive part is then:

If we now implement two additional plugins DoublePositive (doubles the argument) and DoubleNegative (doubles and negates the argument) and place the modules for these two plugins in a subdirectory double under the plugins directory, our plugin collection should be able to handle these.

In order to test everything, we can write a very simple application:

This application will first initialize a PluginCollection on the package plugins. When instantiated, this plugin collection will recursively look for all plugins defined under the folder plugins. After the initialization is done, it will call the perform_operation on each of the plugins with the value 5.

And behold, if you now run the application you will see the following output:

Without any direct reference to any of the plugin modules in your code, it automatically found all of the plugins... MAGIC :)

A complete working version of the above example code can be found in a separate Github repository.

Writing Vst Plugins Python Commands

Drop me a comment in case you think this is useful, or if you have tips, comments, or better approaches :)