Apple publishes the developer's documentation video, explaining how new complex types can be used in the new display of Apple Watch Series 4. These new complications are available on the Infograph and Infograph Modular watch faces.
Both Apple and third party developers can display custom bezel text with a new curved corner gauge in the middle of the Infograph modular watch, a full color graph and image, a dial of approximately 180 degrees.
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Apple calls a curved progress bar as a gauge. These can be updated rainbow colors with gradation, automatically based on the time interval used by the timer application. The range gauge uses the ring to indicate the current value.
Infograph Graphic Modular Face allows you to display arbitrary images in the center beyond simple text and icons. By this, for example, you can display rich graphs in the application.
Graphic corner templates are flexible. You can use text or image gauge, a set of texts of different colors, or a simple icon. These complications seem to be used only for the face of Infograph for the time being. The face of other wristwatches has hardly changed from the design point of view.
The open gauge is at the bottom of the infograph modular face and displays similar information in a corner style with different visual presentations.
Circular rings can be placed on the bottom of a new modular surface or in the middle of the analog surface of the Infograph. These circular complications are progressive value rings or simple images.
For text that is inline with dialing, third party applications may affect this text. The text is always displayed at the top center and you can close the upper half of the dial.