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How to calculate the diameter of TouchPoint on iPhone, iPad and Android device?

Now I understand that we can have 5 default touch points on the iPhone and have different touch points included for different SDKs. However, I did register the points of touch and get the distances, the actual number of points of touch. I would like to know if there is a way to execute and get the Diameter of a specific touch point, for example. calculating finger touch versus index finger, any ideas?

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I think Apple clearly states that they do not intend to provide third-party developers with access to low-level information with a few touches. From the Apple documentation on Event Handling in iOS :

A finger on the screen gives a completely different level of accuracy than the mouse pointer. When the user touches the screen, the contact area is actually elliptical and tends to move below the point where the user thinks he or she has touched. This “contact patch” also varies in size and shape based on which finger touches the screen, finger size, finger pressure on the screen, finger orientation and other factors. Highlights The Multi-Touch system analyzes all this information for you and calculates one touch point.

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Proof that this is possible within the permitted API. Another MultiTouch test Android application, indicated on Google Play, which for me shows the pressure of each touch of its own interface in it (therefore, it should be available in the standard API).

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