I tired than but it is only publishing mouse movements not mouse clicks. when i ran that node i had to first left click mouse button than move the move than only the twist msg was been published.

I'm sorry I'm not sure to have understood your comment.

Yes it is publishing when you click and move, but it's just how the example is made, they just initialize the data when clicking on the window. If you add your publisher (or any call to another function) directly in the function _start (which is bind to the left click) then you can trigger whatever you want. Can you clarify what you want to achieve please ?

ok... looks like i need to understand its source code properly then. well its for 2 axix robot which has camera on it end. the axis rotation should be controlled from mouse movement and the shoot, zooming should be done from left and middle buttons of the mouse.

To do that you would need to bind the different mouse button to some functions that would publish on the corresponding topic like this :

self._canvas.bind('<Button-1>', self._start)

This will call the function _start with the left click of the mouse (defined as Button-1). The mouse wheel click is <Button-2>, and the right click is <Button-3>, mouse wheel up is <Button-4> and mouse wheel down is <Button-5>. So you just need to call self._canvas.bind() for each button with their corresponding function.

ok. but is it possible to use the rviz windows instead of the windows it creates? Cas i want to use the mouse and keypress while viewing the robot and image window in rviz.

If it's with rviz you should have a look at the visualization_tutorial package, there are examples on how to add plugins for rviz, and even an example for teleoping with the mouse.