Class VelocityTracker

Definition

Namespace:
Tizen.NUI.Utility
Assembly:
Tizen.NUI.dll

Calculates the velocity of touch movements over time.

public class VelocityTracker
Inheritance
object
VelocityTracker
Examples

private void OnPanGestureDetected(object source, PanGestureDetector.DetectedEventArgs e) { tracker.AddMovement(e.PanGesture.ScreenPosition, e.PanGesture.Time); if (e.PanGesture.State == Gesture.StateType.Started) { } else if (e.PanGesture.State == Gesture.StateType.Continuing) { } else if (e.PanGesture.State == Gesture.StateType.Finished || e.PanGesture.State == Gesture.StateType.Cancelled) { float panVelocity = (ScrollingDirection == Direction.Horizontal) ? tracker.GetVelocity().X : tracker.GetVelocity().Y; tracker.Clear(); } }

Constructors

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VelocityTracker(int)

Creates a velocity tracker using the specified strategy.

Declaration
public VelocityTracker(int degree = 2)
Parameters
Type Name Description
int degree
View Source

VelocityTracker(VelocityTrackerStrategy[])

Declaration
public VelocityTracker(VelocityTrackerStrategy[] strategy)
Parameters
Type Name Description
VelocityTrackerStrategy[] strategy
Examples

private void OnPanGestureDetected(object source, PanGestureDetector.DetectedEventArgs e) { tracker.AddMovement(e.PanGesture.ScreenPosition, e.PanGesture.Time); if (e.PanGesture.State == Gesture.StateType.Started) { } else if (e.PanGesture.State == Gesture.StateType.Continuing) { } else if (e.PanGesture.State == Gesture.StateType.Finished || e.PanGesture.State == Gesture.StateType.Cancelled) { float panVelocity = (ScrollingDirection == Direction.Horizontal) ? tracker.GetVelocity().X : tracker.GetVelocity().Y; tracker.Clear(); } }

Methods

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AddMovement(Vector2, uint)

Adds movement information

Declaration
public void AddMovement(Vector2 position, uint eventTime)
Parameters
Type Name Description
Vector2 position
uint eventTime
View Source

Clear()

Resets the velocity tracker state.

Declaration
public void Clear()
View Source

ComputeVelocity(int, float)

Compute the current velocity based on the points that have been collected.

Declaration
public void ComputeVelocity(int units, float maxVelocity)
Parameters
Type Name Description
int units

The units you would like the velocity in. A value of 1 provides units per millisecond, 1000 provides units per second.
float maxVelocity

The maximum velocity that can be computed by this method.
View Source

GetVelocity()

Retrieve the last computed velocity.

Declaration
public Vector2 GetVelocity()
Returns
Type Description
Vector2

Extension Methods