[vtkusers] Rotating actors

[Sebastian Klocke]

I don't know a way to enhance control of rotating actors with the mouse, 
but you could use a vtkRenderWindowInteractor and use AddObserver to 
make it react to keypress events, then use a switch/case statement to 
react to different keys with different rotations.

Sebastian

//in constructor of your class which handles the actors
vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
iren->SetRenderWindow(imageWindow);//the window displaying the actors
OnKeyPress *myOnKeyPress = new OnKeyPress(this);//Execute method of this 
is invoked when key pressed
iren -> AddObserver(vtkCommand::KeyPressEvent, myOnKeyPress);//

class OnKeyPress :     public vtkCommand
{
    public:

    //OnKeyPress has to know your class which creates the actors
    //that way, you can invoke a method of the class which knows the actors
        yourClass *owner;

        ///constructor
        OnKeyPress(yourClass *nowner);

        ///this method is called whenever the observer using OnKeyPress 
object detects a key press event
        virtual void Execute(vtkObject *caller, unsigned long eid, void*);

};//OnKeyPress

OnKeyPress::OnKeyPress(yourClass *nowner)
{
    owner= nowner;
}

void OnKeyPress::OnKeyPress::Execute(vtkObject *caller, unsigned long 
eid, void*)
{
    //owner is the class with the actors,
    //in ApplyOnKeyPress, you define the reactions to the values of (*key)
    //like switch (*key) { case 'x' ... break; case 'y'.........}
    owner -> ApplyOnKeyPress(owner -> iren -> GetKeySym());
}


Sean Richards schrieb:

>I render some 3D actors on the screen and then need to translate them around, but also do some rotations. When I do the rotations it is sometimes very hard to get the rotation I want.
>
>Is there a way to add little widgets like you would find in Photoshop or Corel so that you can rotate about one axis only ... with several widgets so you can pick the axis you want to rotate about?
>
>Any help or direction would be greatly appreciated!
>
>Sean
>
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