Controlling a process by generating intensity values

1. A method of deriving directional data from a manually-interactive-device configured to generate positional-data and intensity-data, comprising the steps of:

generating initial positional-data and initial intensity-data from an initial contact of a finger upon said manually-interactive-device, wherein said manually-interactive-device has a resolution sufficiently high to produce a plurality of data-points in response to the application of a single finger; and

producing directional-data in response to a finger rolling or tilting operation, by generating additional intensity-data in which variations occur to intensity values at said plurality of data points, and comparing the differences between said initial positional-data and initial intensity-data and said additional intensity-data at said plurality of data points; wherein

said generating step also includes the steps of:

processing said initial intensity-data to distinguish between a first-intensity and a second-intensity, wherein said second-intensity is higher than said first intensity; and

presenting a menu of selectable items on a display screen, only performing said presenting step upon detecting said second-intensity; and

said producing step includes a step of selecting one of said items, said step of selecting being made only in response to said finger rolling or tilting operation.

2. The method of claim 1 , wherein said step of selecting one of said items includes a step of rotating said menu.

3. The method of claim 1 , wherein said step of selecting one of said items includes a step of highlighting an item in response to producing directional-data in a direction towards said selected item.

4. The method of claim 1 , wherein said generating step includes the steps of:

processing said positional data to distinguish a first contact location from a second contact location;

displaying a first menu in response to identifying said first contact location; and

displaying a second menu in response to identifying said second contact location.

5. The method of claim 1 , wherein said generating step includes the step of presenting a cursor.

6. The method of claim 5 , wherein said producing step also includes a step of moving said cursor.

7. The method of claim 5 , wherein said producing step also includes a step of moving a background image relative to said cursor.

8. The method of claim 6 , wherein the speed of a said movement increases in response to an increase in said intensity-data.

9. An apparatus, comprising a manually-interactive-device, a display-device and a processor, wherein:

said manually-interactive-device has a resolution sufficiently high to produce a plurality of data-points in response to an interaction with a single finger, consisting of initial positional-data and initial intensity-data;

said display-device shows a menu of selectable items in response to initial positional-data and initial intensity-data;

said processor is configured to produce directional data, in response to said manually-interactive-device generating additional intensity-data at said data points during a rolling or tilting of an applied finger, said processor configured to determine said directional data by comparing the differences between said initial positional-data and initial intensity-data and said additional intensity-data; and

said processor is further configured to distinguish between a first-intensity and a second-intensity of said initial intensity-data, wherein said second-intensity is higher than said first intensity, only showing said menu upon detecting said second-intensity; and

to select one of said selectable items in response to said rolling or tilting of an applied finger.

10. The apparatus of claim 9 , wherein said manually-interactive-device is combined with said display screen to form a touch-screen.

11. The apparatus of claim 9 , wherein:

said manually-interactive device includes a plurality of sensors arranged in a matrix; and

said processor is configured to sequentially scan said matrix of sensors to obtain said plurality of data points.

12. The apparatus of claim 11 , wherein:

said sensors include a variable-resistance material; and

the electrical resistance of said variable-resistance material reduces in response to applied pressure.

13. The apparatus of claim 9 , wherein said display-device, in response to said initial positional-data and initial intensity-data, shows a modified image indicating that a particular function has been selected, and said modified image is modified by an extent that varies in response to a degree of applied pressure.

14. A mobile system, comprising a touch-screen, a processor and an input device for receiving geographical data, wherein:

said touch-screen generates initial positional-data and initial intensity-data from an initial contact of a finger upon said manually-interactive-device, in which said manually-interactive-device has a resolution sufficiently high to produce a plurality of data-points in response to the application of a single finger;

said touch-screen shows a cursor overlaying a geographical image derived from said geographical data;

said processor produces directional-data in response to a finger rolling or tilting operation, by generating additional intensity-data in which variations occur to intensity values at said plurality of data points, and compares the differences between said initial positional-data and initial intensity-data and said additional intensity-data;

said geographical data is scrolled in a direction determined by said directional-data;

said generation of said initial positional-data and said initial intensity-data presents a menu of selectable items on a display screen; and

said production of said directional-data selects one of said items in response to said finger rolling or tilting operation; wherein

said processor is configured to:

process said initial intensity-data to distinguish between a first-intensity and a second-intensity, wherein said second-intensity is higher than said first intensity; and

show said cursor upon detecting said second-intensity.

15. The system of claim 14 , wherein the speed of a said movement increases in response to an increase in said intensity-data.

16. The system of claim 14 , assembled as a hand-held portable device, wherein said input device receives geographical data from a remote data source.

17. The system of claim 14 , assembled within a vehicle as a satellite navigation system, wherein said input device receives geographical data from a local data storage device.