Remote multi-touch
A remote multi-touch system includes a pressure-sensitive, multi-touch device, a display separate from the pressure-sensitive, multi-touch device, and a controller communicatively coupled to the pressure-sensitive, multi-touch device and the display. The pressure-sensitive, multi-touch device measures a position at which one or more touches are executed on the pressure-sensitive, multi-touch device and, for each of the one or more touches, a force with which that touch is executed. The controller receives a touch report for each of the one or more touches from the pressure-sensitive, multi-touch device. Each touch report indicates the position at which that touch is executed and the force with which that touch is executed. The controller outputs to the display a pre-touch visualization command for displaying a pre-touch visualization. The pre-touch visualization is displayed at a location of the display mapped from the position at which that touch is executed on the pressure-sensitive, multi-touch device.
1. An apparatus comprising:
a display;
a multi-touch device;
a processor in communication with the display and the multi-touch device, the processor configured to:
receive a first touch report for a first touch executed on the multi-touch device, the first touch report indicating a position and force of the first touch;
receive a second touch report for a second touch executed on the multi-touch device, the second touch report indicating a position and force of the second touch;
filter the force of the first touch and the force of the second touch to ignore a momentary dropout of force caused by unintended force variation while dragging across the multi-touch device;
if the force of the first touch is below a first non-zero force threshold, output a first visualization command to display a pre-touch visualization at a first location on the display, the first location mapped from the position of the first touch;
if the force of the first touch exceeds the first non-zero force threshold, output a first touch input command to indicate the position of the first touch and decrease the first non-zero force threshold for return to pre-touch;
if the force of the second touch is below a second non-zero force threshold, output a second visualization command to display the pre-touch visualization at a second location on the display, the second location mapped from the position of the second touch; and
if the force of the second touch exceeds the second non-zero force threshold, output a second touch input command to indicate the position of the second touch.
2. The apparatus of claim 1 , wherein the pre-touch visualization is concurrently displayed at the first and second locations while the first touch and the second touch are concurrently executed.
3. The apparatus of claim 1 , wherein the pre-touch visualization is a fingertip image.
4. The apparatus of claim 1 , wherein the first non-zero force threshold is equal to the second non-zero force threshold.
5. The apparatus of claim 1 , wherein each of the first and second non-zero force thresholds is selectively variable.
6. The apparatus of claim 1 , wherein the first and second non-zero force thresholds are selectively variable independent of one another.
7. The apparatus of claim 1 , wherein the instructions are further executable to output a haptic feedback signal to the multi-touch device for providing haptic feedback to a user when a touch force exceeds a threshold.
8. A method comprising:
receiving a first touch report for a first touch executed on a multi-touch device, the first touch report indicating a position and force of the first touch;
receiving a second touch report for a second touch concurrently executed on the multi-touch device, the second touch report indicating a position and force of the second touch;
filter the force of the first touch and the force of the second touch to ignore a momentary dropout of force caused by unintended force variation while dragging across the multi-touch device;
reducing a first non-zero force threshold upon increase of a number of touch points detected concurrently on the multi-touch device;
if the force of the first touch is below the first non-zero force threshold, outputting a first visualization command to display a pre-touch visualization at a first location on a display, the first location mapped from the position of the first touch;
if the force of the first touch exceeds the first non-zero force threshold, outputting a first touch input command to indicate the position of the first touch and decrease the first non-zero force threshold for return to pre-touch;
if the force of the second touch is below a second non-zero force threshold, outputting a second visualization command to display a pre-touch visualization at a second location on the display while the pre-touch visualization is concurrently displayed at the first location, the second location mapped from the position of the second touch; and
if the force of the second touch is above the second non-zero force threshold, outputting a second touch input command to indicate the position of the second touch.
9. The method of claim 8 , wherein the pre-touch visualization is a fingertip image.
10. The method of claim 8 , wherein the first non-zero force threshold is equal to the second non-zero force threshold.
11. The method of claim 8 , wherein each of the first and second non-zero force thresholds is selectively variable.
12. The method of claim 8 , wherein the first and second non-zero force thresholds are selectively variable independent of one another.
13. The method of claim 8 , further holding instructions executable by the logic subsystem to output a haptic feedback signal to the multi-touch device for providing haptic feedback to a user when a touch force exceeds a threshold.
14. An apparatus comprising:
a processor;
a memory in communication with the processor, the memory programmed with instructions executable to:
receive a first touch report for a first touch, the first touch report indicating a position and force of the first touch;
receive a second touch report for a second touch, the second touch report indicating a position and force of the second touch;
filter the force of the first touch and the force of the second touch to ignore a momentary dropout of force caused by unintended force variation while dragging across the multi-touch device;
compute a derivative of the force of the first touch with respect to time;
if the derivative of the force of the first touch is below a first non-zero force threshold distinguishing a sudden increase in the force of the first touch, output a first visualization command to display a pre-touch visualization at a first location, the first location mapped from the position of the first touch;
if the derivative of the force of the first touch exceeds the first non-zero force threshold, output a first touch input command to indicate the position of the first touch and decrease the first non-zero force threshold for return to pre-touch;
if the force of the second touch is below a second non-zero force threshold equal to the first non-zero force threshold, output a second visualization command to display the pre-touch visualization at a second location of the display, the second location mapped from the position of the second touch; and
if the force of the second touch is above the second non-zero force threshold, output a second touch input command to indicate the position of the second touch.
15. The apparatus of claim 14 , wherein the pre-touch visualization is concurrently displayed at the first and second locations while the first touch and the second touch are concurrently executed.
16. The apparatus of claim 14 , wherein the pre-touch visualization is a fingertip image.
17. The apparatus of claim 14 , wherein the instructions are further executable to output a haptic feedback signal to the multi-touch device for providing haptic feedback to a user when a touch force exceeds a threshold.
18. The apparatus of claim 1 , wherein the instructions are further executable to display a post-touch visualization on the display if the force of the first touch exceeds the first non-zero force threshold.
19. The apparatus of claim 1 , wherein the instructions are further executable to increase the first non-zero force threshold for subsequent touch detection if the force of the first touch falls below the first non-zero force threshold.