Abstract: In one embodiment, a method includes sending information to display an image on a screen. A scroll range for the image may be determined based on dimensions of the image. An origin position and an initial tilt of a gyroscope may also be determined for the image. Tilt measurements associated with the presentation of the image may be received as the gyroscope detects changes in tilt. A progress parameter may be determined based on at least the scroll range, the origin position, and the initial tilt. A scrolling presentation of the image may then be rendered based on the progress parameter. The scrolling presentation of the image may be smoothed by applying an RK4 solver to the tilt measurements to eliminate jitter due to hand tremors. A virtual spring effect may also be applied to give the scrolling presentation a bouncy effect as the edge of the image is reached.

Abstract: In one embodiment, a method includes receiving a touch input within a particular region of a display area of the computing device. The display area presents a user interface (UI) including a number of views and an outside view. Each of the views corresponds to one or more regions of the display area. One or more of the views has a gesture recognizer configured to process a touch input detected within the regions of the display area associated with each of the views. The outside view has a gesture recognizer configured to process the touch input detected within the display area. The views are organized in a hierarchy. The method also includes determining whether a particular one of the views from among the views is set as a modal view.

Abstract: In one embodiment, an image may be displayed in one of several display modes. When an image is displayed in a first display mode on the screen of an electronic device, a user input may cause the image to transition to a second display mode. An animation sequence is displayed while the image transitions from the first display mode to the second display mode.