optozorax / gesture-recognizer

Recognize gestures by touch events

Gesture Recognizer

This crate provides abstract API to recognize and handle simple gestures. At now three type of gestures are supported:

• Move by one finger
• Scale and move by two fingers
• Move by three fingers

To handle this gestures you need to

• implement GestureEvents trait
• has GestureRecognizer struct
• run process method of GestureRecognizer on each touch event, this process method will run methods of GestureEvents trait on object that you proceed to it

miniquad

This crate originally created for miniquad. So, the crate has miniquad as optional dependency. If you choose this optional dependency, you will get code to transform miniquad::TouchPhase to gesture_recognizer::TouchType by From trait.

TODO

Gestures

• long-tap (user need to provide own time method (because of wasm, android etc.))
  • long-tap by N fingers
  • recursive gestures by long-tap (e.g. long-tap by one finger + then scale by two fingers or also long-tap by one finger + ...)
• discrete gestures
  • double-tap (user time method again)
    • N-tap by M-fingers
  • swipe ???
• screen edge flag ???

Other

• add rotation to current two fingers gesture!
• add example on miniquad when all events are visualized and logged to screen and deploy it to wasm!
• stole ideas from https://developer.apple.com/documentation/uikit/uigesturerecognizer
• speed of gestures ???
• how to provide both powerful and easy interface ???
• think about point type,

Discarded

• recognize user images, eg smile, letters. Discarded because this need some machine learning and expensive computations