Get mouse Position and Mouse Clicks with Jetson-utils

Issue Overview

Users have reported challenges in utilizing the jetson-utils library for capturing mouse clicks and positions on the Nvidia Jetson Orin Nano Dev board. The main symptoms include:

• Inability to register mouse clicks using jetson-utils, which is noted as being deprecated.
• Attempts to use the library for drawing shapes have failed, indicating potential issues with functionality.
• Users have expressed confusion regarding the transition from jetson.utils to jetson_utils, with concerns about whether all functionalities remain intact.

The context of these issues often arises during the development of applications that require user input, specifically when integrating tracking features with camera systems. Users have mentioned that when enabling tracking functions, unwanted parameters are printed to the terminal, complicating their debugging and output management processes.

The frequency of these issues appears to be consistent among multiple users, impacting their development experience and productivity.

Possible Causes

Several potential causes for these issues have been identified:

• Deprecation of Libraries: The transition from jetson.utils to jetson_utils may lead to missing functionalities or bugs if users are not aware of this change.
• Lack of Python Bindings: Not all C++ functions in the jetson_utils library are available in Python, which limits functionality for Python developers.
• Configuration Errors: Users may not be correctly configuring event handlers or logging levels, leading to unexpected behavior in their applications.
• Driver Issues: Compatibility problems with specific versions of JetPack or underlying drivers could lead to erratic performance.
• User Misconfigurations: Incorrect usage of API functions or misunderstanding of how to implement event handling may contribute to these issues.

Troubleshooting Steps, Solutions & Fixes

To address the reported issues, users can follow these troubleshooting steps and solutions:

1. Check Library Versions:

   • Ensure you are using the correct version of the library. Transition from jetson.utils to jetson_utils may require updates in your codebase.

2. Register Mouse Clicks:

   • For capturing mouse events in C++, utilize the following code snippet:

     void RemoveEventHandler(glEventHandler callback, void* user=NULL);
     

   • This function removes previously registered event handlers for mouse clicks.

3. Get Mouse Position:

   • Use this function to retrieve the current mouse position:

     const int* GetMousePosition() const { return mMousePos; }
     

4. Python Alternatives:

   • If you are using Python and need similar functionality, consider adding custom bindings or using another GUI toolkit (e.g., PyQt or Tkinter) that supports mouse events.

5. Control Logging Output:

   • To manage logging output during tracking operations, set the log level by including this line in your Python code:

     from jetson_utils import Log
     Log.SetLevel('info')
     

   • Alternatively, modify the C++ source code directly to comment out unnecessary print statements related to tracking status.

6. Testing Different Configurations:

   • Isolate the issue by testing different hardware setups or configurations. For example, try running without certain peripherals connected or using a different display setup.

7. Documentation and Updates:

   • Regularly check Nvidia’s documentation for updates regarding jetson-utils, JetPack versions, and any new releases that might address existing bugs.

8. Community Support:

   • Engage with community forums for additional insights or shared experiences from other developers who may have faced similar challenges.

By following these steps, users can effectively troubleshoot and potentially resolve issues related to mouse input handling on the Nvidia Jetson Orin Nano Dev board.