Patent ID: 8531571

Claim:
A method for browsing a document on a portable electronic device, comprising: opening and displaying the document in a document browsing application executing on the portable electronic device; determining a state of a user-selectable activation control disposed on the portable electronic device; in response to the activation control being in a selected state, reading orientation data from a sensor of the portable electronic device, the orientation data indicating the portable electronic device's orientation in space; determining from the orientation data that the portable electronic device has rotated in a first predetermined direction about an axis that extends perpendicular to a front of a display screen of the portable electronic device through a center of the display screen of the portable electronic device, and causing the document browsing application to zoom in on a portion of the document being displayed in response to the rotation; is in response to the activation control being in a released state, ceasing zooming in response to any further rotation of the portable electronic device.