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configurability

  • may now implement triggering of end gesture if start gesture exists and or the initial circle has been extended somewhat. This combated or enables the ability to cancel a gesture much better than current methods which only "cancel" in some direction by executing the opposite gesture. I believe this should be default behavior.

    messaging protocol

  • have main loop send updates as queues
  • three types
    • finger_start : called when a new finger verifies both its x and y coordinates (merged with finger_add : called when a new finger is touches to touchpad)
    • finger_update: called when a finger updates x and y after verification
    • finger_remove: called when a finger is removed from touchpad

event consequences

finger_start

  • end gesture
    • signify end of a started gesture
    • restart gesture params
    • restart debounce
  • initiate state for new finger
  • increment counter for number of fingers started which signifies current gesture level

finger_update

  • update state for updated finger
  • pick which type of gesture is currently executing after all figures have been verified
  • enqueue gesture to run

finger_remove

  • end gesture
    • signify end of a started gesture
    • restart gesture params
    • restart debounce
  • execute tap based gesture if any other gesture had not been started
  • update state to reflect removed finger

main run loop

  • get messages(dequeue from message queue) and do appropriate action
  • dequeue from gesture queue and execute after debounce times out

factor to run on all devices

  • can calculate the factor number from the size of the x and y, check how it scales down to touchpad
  • for now set manually

all guestures to implement

holy grail feature

  • finger/s specific tap, swipe and pinch while any number of fingers are resting on the touchpad which are used as modifiers

for now

  • swipe in the 8 different directions with all 3, 4 and 5 fingers
  • tap with all 4, and 5 fingers
  • maybe pinch clockwise and counterclockwise?
  • pin in and out with all 2,3, 4, 5 fingers
  • maybe pinch clockwise and counterclockwise?

to do

  • pinch guestures
  • HOLY GRAIL: finger/s specific tap, swipe and pinch while any number of fingers are resting on the touchpad which are used as modifiers

comments

  • the design was a success
    • big lesson is that you really need OS + window environment + window manager support to smoothly implement features