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Define a orientation for vertical and horizontal movement.
Also define starting point top or bottom, left or right.

Implement a DeviceFinder class that searches for devices according to the current position of the smartphone.
The DeviceFinder should be able to register objects that want to be informed when the list of devices that the smartphone points to changes (Thus, implement an interface DeviceListDelegate that has a method delegateDeviceList(List devices) which is called by the DeviceFinder for every registered object on every change of the device list). The DeviceProxy class was implemented by Christoph and represents one device.
The position of the device is defined by the cardinal direction. Every device should store its cardinal direction, and its z-axis as an integer (which represent the spatial order of the devices in case one device is behind another). Feel free to implement this.
The device finder should be basically a thread that polls the compass every x ms and and iterates through every device and constructs the list of devices the smartphone points to. If the list has changed, it should push this information to every DeviceListDelegate.

Outcome of a user interview:

• optionally do not show values as text
  -> then target value ist only displayed for a short time
• add unit to the displayed value

Create interfaces for several devices which should be controlled by the app:

• Lights
• Computer
• TV
• Radio
• Shutters
• Speakers

Fix incorrect image scaling

Each widget should have an interface that allows for callbacks that are called on user input w.r.t. to the actions those widgets allow.

For example the device tv has 3 controlls: SwitchChannel, turn on and off, change volume.

Every device should have a list of controls.