Interpretation of pressure based gesture

A gesture interpretation unit comprising a processor configured to receive touch input data indicating touch inputs on a touch surface of a touch sensing device, wherein the touch input data comprises positioning data xnt, ynt and pressure data pnt for each touch input;

• the unit further comprises a computer readable storage medium storing instructions operable to cause the processor to perform operations comprising:
• presenting a graphical interactive object via a graphical user interface, GUI, wherein the GUI is visible via the touch surface;
• determining from said touch input data:
• a first touch input from a first object at a first position on the touch surface, and
• a second touch input from a second object at a second position on the touch surface, and
• a third touch input from a third object at a third position on the touch surface, wherein said first, second and third objects are present on the touch surface during overlapping time periods;
• and while continuous contact of said first, second and third objects with the touch surface is maintained:
• calculating a geometric centre of mass, GCM, for said first, second and third touch inputs using positioning data xnt, ynt for said touch inputs;
• calculating a pressure centre of mass, PCM, for said first, second and third touch inputs using pressure data pnt for said touch inputs;
• comparing said GCM with said PCM:
• determining a movement vector k based on the result of the comparison;
• and
• moving the graphical interactive object in relation to the movement vector k.