VelocityTracker class
Computes a pointer's velocity based on data from PointerMoveEvents.
The input data is provided by calling addPosition. Adding data is cheap.
To obtain a velocity, call getVelocity or getVelocityEstimate. This will compute the velocity based on the data added so far. Only call these when you need to use the velocity, as they are comparatively expensive.
The quality of the velocity estimation will be better if more data points have been received.
- Implementers
Constructors
- VelocityTracker.withKind(PointerDeviceKind kind)
-
Create a new velocity tracker for a pointer
kind.
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- kind → PointerDeviceKind
-
The kind of pointer this tracker is for.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
addPosition(
Duration time, Offset position) → void - Adds a position as the given time to the tracker.
-
getVelocity(
) → Velocity - Computes the velocity of the pointer at the time of the last provided data point.
-
getVelocityEstimate(
) → VelocityEstimate? - Returns an estimate of the velocity of the object being tracked by the tracker given the current information available to the tracker.
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited