rampToVideoZoomFactor method

Future<void> rampToVideoZoomFactor(double factor, double rate)

Begins a smooth transition from the current zoom factor to another.

rate is specified in powers of two per second.

Allowed values for factor range from 1.0 (full field of view) to the videoMaxZoomFactor specified by the active capture format.

During a ramp, the zoom factor changes at an exponential rate, but this yields a visually linear transition. The rate parameter controls the speed of this transition independent of direction; for example, a value of 1.0 causes zoom factor to double every second if zooming in (that is, if the specified factor is greater than the current videoZoomFactor) or halve every second if zooming out.

Before calling this method, you must call lockForConfiguration to acquire exclusive access to the device’s configuration properties. If you do not, calling this method raises an exception. When you finish configuring the device, call unlockForConfiguration to release the lock and allow other devices to configure the settings.

Implementation

Future<void> rampToVideoZoomFactor(double factor, double rate) {
  return _channel.$rampToVideoZoomFactor(this, factor, rate);
}