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gioui.org/internal/fling

package fling

v0.0.0 (278e9bc)
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Published: Jun 3, 2020 | Licenses: MIT, Unlicense | Module: gioui.org

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type Animation

type Animation struct {
	// contains filtered or unexported fields
}

func (*Animation) Active

func (f *Animation) Active() bool

func (*Animation) Start

func (f *Animation) Start(c unit.Converter, now time.Time, velocity float32) bool

Start a fling given a starting velocity. Returns whether a fling was started.

func (*Animation) Tick

func (f *Animation) Tick(now time.Time) int

Tick computes and returns a fling distance since the last time Tick was called.

type Estimate

type Estimate struct {
	Velocity float32
	Distance float32
}

type Extrapolation

type Extrapolation struct {
	// contains filtered or unexported fields
}

Extrapolation computes a 1-dimensional velocity estimate for a set of timestamped points using the least squares fit of a 2nd order polynomial. The same method is used by Android.

func (*Extrapolation) Estimate

func (e *Extrapolation) Estimate() Estimate

Velocity returns an estimate of the implied velocity and distance for the points sampled, or zero if the estimation method failed.

func (*Extrapolation) Sample

func (e *Extrapolation) Sample(t time.Duration, val float32)

Sample adds an absolute sample to the estimation.

func (*Extrapolation) SampleDelta

func (e *Extrapolation) SampleDelta(t time.Duration, delta float32)

SampleDelta adds a relative sample to the estimation.

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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