Touch input transitions
Selection of input of a touch sensing surface is provided. Contacts on or near a surface are tracked to obtain touch information of the contacts. A first gesture is detected corresponding to first touch information of a number of contacts performing an activity, and a first input corresponding to the first gesture is selected. A second gesture is detected corresponding to second touch information of a number of contacts performing an activity. A determination of whether to select a second input corresponding to the second gesture is made. The second input is selected if third information satisfies a predetermined criteria, and the first input is maintained if the third information does not satisfy the predetermined criteria.
1. A method of selecting input of a computer system including a touch sensing surface, the method comprising:
tracking one or more contacts on or near the surface to obtain touch information of the contacts;
determining a number of the one or more contacts;
determining whether the one or more contacts are in motion;
determining whether the one or more contacts are at a rolling stop; and
selecting an input based on the number of contacts, whether the contacts are in motion, and whether the contacts are at a rolling stop;
wherein determining whether the one or more contacts are at a rolling stop further comprises:
determining a first average speed of the one or more contacts motion over a first period of time;
determining a second average speed of the one or more contacts motion over a second period of time, the second period of time shorter than the first period of time; and
comparing the first average speed and the second average speed to determine whether the one or more contacts are decelerating.
2. The method of claim 1 , wherein selecting an input further comprises:
when the number of contacts is three and all three contacts are in motion at a rolling stop, selecting a three-finger input;
when the number of contacts is four and the four contacts are in vertical motion at a rolling stop, selecting a view all windows input;
when the number of contacts is four and the four contacts are in horizontal motion at a rolling stop, selecting an application-switching input; and
when the number of contacts is two or five or if not all contacts are in motion, maintaining a point input.
3. The method of claim 2 , wherein the three-finger input is either a swipe input or drag input.
4. The method of claim 1 , further comprising:
when the number of contacts is one, determining whether at least one additional contact is detected;
when at least one additional contact is detected, determining the number of additional contacts; and
when the number of additional contacts is not four, determining whether the at least one additional contact is made during a rolling stop.
5. The method of claim 4 , wherein selecting an input further comprises:
when the number of additional contacts is three and if the at least one additional contact is made during a rolling stop, selecting a four-finger input;
when the number of additional contacts is two and if the at least one additional contact is made during a rolling stop, selecting a three-finger input; and
when the number of additional contacts is one and if the at least one additional contact is made during a rolling stop, selecting either a scroll input or a tap input.
6. The method of claim 5 , wherein the three-finger input is either a swipe input or drag input.
7. A computing system including a touch sensing surface, the system comprising:
a contact tracker configured to track one or more contacts on or near the surface to obtain touch information of the contacts;
an input selection system configured to
determine a number of the one or more contacts;
determine whether the one or more contacts are in motion;
determine whether the one or more contacts are at a rolling stop; and
select an input based on the number of contacts, whether the contacts are in motion, and whether the contacts are at a rolling stop;
wherein the input selection system further comprises:
a first autoregressive filter configured to provide an indication of a first average speed of a contact motion over a first period of time;
a second autoregressive filter configured to provide an indication of a second average speed of the contact motion over a second period of time, the second period of time shorter than the first period of time; and
a processor configured to compare the first average speed and the second average speed to determine whether the one or more contacts are decelerating.
8. The computing system of claim 7 , wherein the input selection system is further configured to:
when the number of contacts is three and all three contacts are in motion at a rolling stop, select a three-finger input;
when the number of contacts is four and the four contacts are in vertical motion at a rolling stop, select a view all windows input;
when the number of contacts is four and the four contacts are in horizontal motion at a rolling stop, select an application-switching input; and
when the number of contacts is two or five or if not all contacts are in motion, maintain a point input.
9. The computing system of claim 8 , wherein the three-finger input is either a swipe input or drag input.
10. The computing system of claim 7 , wherein the input selection system is further configured to:
when the number of contacts is one, determine if at least one additional contact is detected;
when at least one additional contact is detected, determine the number of additional contacts; and
when the number of additional contacts is not four, determine if the at least one additional contact is made during a rolling stop.
11. The computing system of claim 10 , wherein the selection system is further configured to:
when the number of additional contacts is three and if the at least one additional contact is made during a rolling stop, select a four-finger input;
when the number of additional contacts is two and if the at least one additional contact is made during a rolling stop, select a three-finger input; and
when the number of additional contacts is one and if the at least one additional contact is made during a rolling stop, select either a scroll input or a tap input.
12. The computing system of claim 11 , wherein the three-finger input is either a swipe input or drag input.