Is there a name for this interaction pattern?

I want to create an input element where two values are altered by the distances a finger moved along both axises and the distance the finger has moved alters the speed the values are changed.
Imaging a color creation tool, where the x-axis defines the hue value change and the y-axis defines the saturation value change. The user would touch the view and drag their finger along the screen. The further he moves away from the point of origin along the x-axis, the faster the hue-value would change and the displayed color would circle through the colours, while the distance along the y-axis changes the saturation in a similar way, though being capped at min at max value.

Or another way to put it: a track pad that behaves more like an IBM track point.

What would such an UI element be called?
Thanks

update:

here a prototype with standard ui elements:

The first two sliders would be gone and the x-axis would substitute the hue slider and the y-axis the saturation slider.