Touch Input Device¶
Available on iOS
Description¶
Interface to the built-in touchscreen on an iOS device.
This device detects and tracks the movement of a single touch (e.g. finger) on the screen. If the screen is touched in multiple locations simultaneously, only the first detected touch is tracked. All other touches are ignored.
Signature¶
iodevice/touch_input
Required Parameters¶
touch_position_x¶
Variable in which to store the horizontal position of the touch (in degrees) on the screen
touch_position_y¶
Variable in which to store the vertical position of the touch (in degrees) on the screen
touch_in_progress¶
Variable in which to store the touch state (true if a touch is in progress, false otherwise)
Optional Parameters¶
autostart¶
- Default
NO
If YES, the device will start I/O automatically (as if by an
implicit Start IO Device action) when the experiment starts running.
Note: Device I/O will always stop automatically when the experiment stops running, irrespective of this setting.
alt¶
Alternative device to use if this one fails to initialize (e.g. because the required hardware is not available). If #allowAltFailover is set to 0 or false, this parameter is ignored.