uē-tôo

Appearance

@ue-too/board / TouchOutputEvent

Type Alias: TouchOutputEvent ​

TouchOutputEvent = { delta: Point; type: "pan"; } | { anchorPointInViewPort: Point; delta: number; type: "zoom"; } | { type: "none"; }

Defined in: packages/board/src/input-interpretation/input-state-machine/touch-input-state-machine.ts:63

Output events produced by the touch state machine for the orchestrator.

Remarks ​

Touch gestures are recognized from two-finger interactions:

Pan Gesture:

  • Two fingers move in the same direction
  • Delta is calculated from the midpoint movement
  • Triggers when midpoint delta > distance delta

Zoom Gesture:

  • Two fingers move toward/away from each other (pinch)
  • Delta is calculated from distance change between fingers
  • Anchor point is the midpoint between fingers
  • Triggers when distance delta > midpoint delta

Coordinate Spaces:

  • Pan delta is in window pixels
  • Zoom anchor point is in viewport coordinates