Method and apparatus for single touch zoom using spiral rotation
A touchscreen display device implements a single touch operation using a spiral rotation gesture on a touchscreen display device to magnify the display of an image. Continued spiral rotations result in continued magnification. A zoom-in or zoom-out operation is implemented by a single touch spiral rotation. In one example, a spiral rotation defining an increasing area has a corresponding action to reduce a display portion of the display screen. Similarly, a spiral rotation defining a decreasing area has a corresponding action to magnify the display portion of the display screen. A floating origin may be used to identify gestures at various positions on a touchscreen display.
1. A method comprising:
identifying, using at least one processor, an origin on a display device;
detecting, using the at least one processor, a gesture on the display device at a first location;
determining, using the at least one processor, a first distance from the origin to the first location;
tracking, using the at least one processor, movement of the gesture from the first location to a second location;
determining, using the at least one processor, a second distance from the origin to the second location; and
determining, using the at least one processor, an action associated with the gesture based on the movement of the gesture and a comparison of the first and second distances;
wherein:
the gesture defines a circular area centered at the origin; and
the action comprises:
reducing an image displayed on the display device when the movement of the gesture defines an increasing circular area; and
magnifying the image displayed on the display device when the movement of the gesture defines a decreasing circular area.
2. The method of claim 1 , wherein:
magnifying the image displayed on the display device when the movement of the
gesture defines a decreasing circular area comprises magnifying the image displayed on the display device when the first distance is greater than the second distance; and
reducing the image displayed on the display device when the movement of the gesture defines an increasing circular area comprises reducing the image displayed on the display device when the first distance is less than the second distance.
3. The method of claim 1 , further comprising: detecting a spiral rotation when an angle formed by a first radial line from the origin to a start point of the gesture and a second radial line from the origin to an end point of the gesture is greater than a threshold angular value.
4. The method of claim 1 , wherein the origin is a floating origin.
5. The method of claim 1 , wherein:
the gesture is a first gesture;
the action is a first action; and
the method further comprises:
initiating a set up procedure to associate gestures with associated magnification actions;
detecting a second gesture;
presenting a list of associated magnification actions on the display device;
receiving a user selection of a second action; and
associating the gesture with the second action.
6. An apparatus, comprising:
a touch sensor configured to detect a gesture at a first location; and
one or more non-transitory electronic storage media comprising instructions that, when executed, are configured to:
identify an origin;
determine a first distance from the origin to the first location;
track movement of the gesture from the first location to a second location;
determine a second distance from the origin to the second location; and
determine an action associated with the gesture based on the movement of the gesture and a comparison of the first and second distances;
wherein:
the gesture defines a circular area centered at the origin; and
the action comprises:
reducing an image displayed on the apparatus when the movement of the gesture defines an increasing circular area; and
magnifying the image displayed on the apparatus when the movement of the gesture defines a decreasing circular area.
7. The apparatus of claim 6 , wherein:
magnifying the image displayed on the apparatus when the movement of the gesture defines a decreasing circular area comprises magnifying the image displayed on the display device when the first distance is greater than the second distance; and
reducing the image displayed on the apparatus when the movement of the gesture defines an increasing circular area comprises reducing the image displayed on the display device when the first distance is less than the second distance.
8. The apparatus of claim 6 , wherein the instructions are further configured to:
detect a spiral rotation when an angle formed by a first radial line from the origin to a start point of the gesture and a second radial line from the origin to an end point of the gesture is greater than a threshold angular value.
9. The apparatus of claim 6 , wherein the origin is a floating origin.
10. The apparatus of claim 6 , wherein:
the gesture is a first gesture;
the action is a first action; and
the instructions are further configured to:
initiate a set up procedure to associate gestures with associated magnification actions;
detect a second gesture;
present a list of associated magnification actions on the apparatus;
receive a user selection of a second action; and
associating the gesture with the second action.
11. A machine-readable non-transitory medium storing instructions that, when executed by at least one processor, are configured to
identify an origin on a display device;
detect a gesture on the display device at a first location;
determine a first distance from the origin to the first location;
track movement of the gesture from the first location to a second location;
determine a second distance from the origin to the second location; and
determine an action associated with the gesture based on the movement of the gesture and a comparison of the first and second distances;
wherein:
the gesture defines a circular area centered at the origin; and
the action comprises:
reducing an image displayed on the display device when the movement of the gesture defines an increasing circular area; and
magnifying the image displayed on the display device when the movement of the gesture defines a decreasing circular area.
12. The medium of claim 11 wherein the origin is a floating origin.
13. The medium of claim 11 , wherein the instructions, when executed by the at least one processor, are further configured to:
identify a spiral rotation when the gesture defines an angular measure above a threshold value, wherein the angular measure is measured from a radial line defined by the first location and the origin.
14. The medium of claim 11 , wherein the action comprises:
magnifying an image displayed on the display device when the movement of the gesture defines a decreasing circular area comprises magnifying the image displayed on the display device when the first distance is greater than the second distance; and
reducing the image displayed on the display device when the movement of the gesture defines an increasing circular area comprises reducing the image displayed on the display device when the first distance is less than the second distance.
15. The medium of claim 11 , wherein:
the gesture is a first gesture;
the action is a first action; and
the instructions, when executed by the at least one processor, are further configured to:
initiate a set up procedure to associate gestures with associated magnification actions;
detect a second gesture;
present a list of associated magnification actions on the display device;
receive a user selection of a second action; and
associating the gesture with the second action.