@ue-too/board / index / TouchContext
Interface: TouchContext
Defined in: packages/board/src/input-interpretation/input-state-machine/touch-input-context.ts:47
Context interface for the touch input state machine.
Remarks
This context manages the state required for multi-touch gesture recognition:
Touch Point Tracking:
- Maintains a map of active touch points by identifier
- Stores initial positions to calculate deltas for pan gestures
- Stores initial distances to calculate zoom factors
Gesture Recognition:
- Single-finger: Not handled (reserved for UI interactions)
- Two-finger: Pan and pinch-to-zoom gestures
- Three+ fingers: Currently not handled
Coordinate System: Similar to KMT, the alignCoordinateSystem flag controls Y-axis orientation.
This interface extends BaseContext from the @ue-too/being state machine library.
Extends
BaseContext
Properties
addTouchPoints()
addTouchPoints: (
points) =>void
Defined in: packages/board/src/input-interpretation/input-state-machine/touch-input-context.ts:49
Adds new touch points to tracking
Parameters
points
Returns
void
alignCoordinateSystem
alignCoordinateSystem:
boolean
Defined in: packages/board/src/input-interpretation/input-state-machine/touch-input-context.ts:59
Whether to use standard screen coordinate system (vs inverted Y-axis)
canvas
canvas:
Canvas
Defined in: packages/board/src/input-interpretation/input-state-machine/touch-input-context.ts:61
Canvas accessor for dimensions and coordinate transformations
getCurrentTouchPointsCount()
getCurrentTouchPointsCount: () =>
number
Defined in: packages/board/src/input-interpretation/input-state-machine/touch-input-context.ts:53
Returns the current number of active touch points
Returns
number
getInitialTouchPointsPositions()
getInitialTouchPointsPositions: (
idents) =>TouchPoints[]
Defined in: packages/board/src/input-interpretation/input-state-machine/touch-input-context.ts:55
Retrieves the initial positions of specific touch points
Parameters
idents
number[]
Returns
removeTouchPoints()
removeTouchPoints: (
idents) =>void
Defined in: packages/board/src/input-interpretation/input-state-machine/touch-input-context.ts:51
Removes touch points from tracking by identifier
Parameters
idents
number[]
Returns
void
updateTouchPoints()
updateTouchPoints: (
pointsMoved) =>void
Defined in: packages/board/src/input-interpretation/input-state-machine/touch-input-context.ts:57
Updates the current positions of touch points
Parameters
pointsMoved
Returns
void
Methods
cleanup()
cleanup():
void
Defined in: packages/being/dist/interface.d.ts:31
Returns
void
Inherited from
BaseContext.cleanup
setup()
setup():
void
Defined in: packages/being/dist/interface.d.ts:30
Returns
void
Inherited from
BaseContext.setup