MMMVelocityMeter

Objective-C

@interface MMMVelocityMeter : NSObject

Swift

class MMMVelocityMeter : NSObject

A little helper for velocity/acceleration calculations: you feed it values with timestamps and can get the most recent acceleration/velocity values.

  • Resets the state of the meter, all values added before are forgotten.

    Declaration

    Objective-C

    - (void)reset;

    Swift

    func reset()

  • Adds a coordinate and a corresponding timestamp.

    Declaration

    Objective-C

    - (void)addValue:(CGFloat)value timestamp:(NSTimeInterval)timestamp;

    Swift

    func addValue(_ value: CGFloat, timestamp: TimeInterval)

  • Adds a coordinate with the current timstamp.

    Declaration

    Objective-C

    - (void)addValue:(CGFloat)value;

    Swift

    func addValue(_ value: CGFloat)

  • Calculates velocity and acceleration based on recently added values.

    Declaration

    Objective-C

    - (void)calculateVelocity:(nonnull CGFloat *)velocity
             acceleration:(nonnull CGFloat *)acceleration;

    Swift

    func calculateVelocity(_ velocity: UnsafeMutablePointer<CGFloat>, acceleration: UnsafeMutablePointer<CGFloat>)