[vtkusers] control with keyboard

[verena kinder]

Hello!

In order to make a program like:

switch (key) {
		case VTK_KEY_RIGHT : move(obj); break;
		case VTK_KEY_LEFT : move(obj); break;
		case VTK_KEY_UP : move(obj); break;
		case VTK_KEY_DOWN : move(obj); break;
		case W:
			// Create transfer mapping scalar value to opacity
    			vtkPiecewiseFunction *tfun = vtkPiecewiseFunction::New();
    			tfun->AddPoint(20,0.0);
    			tfun->AddPoint(255,0.3);

			// Create transfer mapping scalar value to color
    			vtkColorTransferFunction *cfun = vtkColorTransferFunction::New();
    			cfun->AddRGBPoint(0.0,0.0,0.0,0.0);
    			cfun->AddRGBPoint(64.0,1.0,0.0,0.0);
    			cfun->AddRGBPoint(128.0,0.0,1.0,0.0);
  			break;

		case G:
			// Create transfer mapping scalar value to opacity
    			vtkPiecewiseFunction *tfun = vtkPiecewiseFunction::New();
    			tfun->AddPoint(254,0.0);
    			tfun->AddPoint(255,1.0);

			// Create transfer mapping scalar value to color
    			vtkColorTransferFunction *cfun = vtkColorTransferFunction::New();
    			cfun->AddRGBPoint(255.0,0.0,1.0,0.0);
	}
I want to know if and how there is a possibility to interact with the keyboard and the window.
For example: If i press 'W' my Program renders with new parameter.

Thanks!  

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