package animation

import "time"

// Material Design 3 easing curves.

//

// These match the exact values from M3 specification, Flutter's Easing class,

// and Android's MotionTokens.kt.

var (

// M3Standard is the standard M3 easing for utility animations that

// begin and end on screen.

M3Standard = CubicBezier(0.2, 0.0, 0.0, 1.0)

// M3StandardAccelerate is the M3 easing for utility animations

// exiting the screen.

M3StandardAccelerate = CubicBezier(0.3, 0.0, 1.0, 1.0)

// M3StandardDecelerate is the M3 easing for utility animations

// entering the screen.

M3StandardDecelerate = CubicBezier(0.0, 0.0, 0.0, 1.0)

// M3Emphasized is the primary M3 easing for common animations on screen.

// This is a two-segment curve (ThreePointCubic) matching Flutter's exact

// easeInOutCubicEmphasized definition.

M3Emphasized = ThreePointCubic(

[2]float32{0.05, 0},

[2]float32{0.133333, 0.06},

[2]float32{0.166666, 0.4},

[2]float32{0.208333, 0.82},

[2]float32{0.25, 1.0},

)

// M3EmphasizedAccelerate is the M3 easing for styled animations

// exiting the screen.

M3EmphasizedAccelerate = CubicBezier(0.3, 0.0, 0.8, 0.15)

// M3EmphasizedDecelerate is the M3 easing for styled animations

// entering the screen.

M3EmphasizedDecelerate = CubicBezier(0.05, 0.7, 0.1, 1.0)

// M3Linear is the M3 linear easing for simple, non-styled motion.

M3Linear = Linear

)

// Material Design 3 duration tokens.

//

// Duration increases with animation area and traversal distance.

// Values match M3 specification exactly.

const (

// DurationShort1 is for micro-interactions (icon state changes).

DurationShort1 = 50 * time.Millisecond

// DurationShort2 is for small element fades.

DurationShort2 = 100 * time.Millisecond

// DurationShort3 is for button press feedback.

DurationShort3 = 150 * time.Millisecond

// DurationShort4 is for checkbox and switch toggles.

DurationShort4 = 200 * time.Millisecond

// DurationMedium1 is for card expand and small transitions.

DurationMedium1 = 250 * time.Millisecond

// DurationMedium2 is for dialog appear and menu open.

DurationMedium2 = 300 * time.Millisecond

// DurationMedium3 is for medium area transitions.

DurationMedium3 = 350 * time.Millisecond

// DurationMedium4 is for navigation transitions.

DurationMedium4 = 400 * time.Millisecond

// DurationLong1 is for large area transitions.

DurationLong1 = 450 * time.Millisecond

// DurationLong2 is for full-screen transitions.

DurationLong2 = 500 * time.Millisecond

// DurationLong3 is for complex multi-element transitions.

DurationLong3 = 550 * time.Millisecond

// DurationLong4 is for large complex transitions.

DurationLong4 = 600 * time.Millisecond

// DurationExtraLong1 is for extended transitions.

DurationExtraLong1 = 700 * time.Millisecond

// DurationExtraLong2 is for extended complex transitions.

DurationExtraLong2 = 800 * time.Millisecond

// DurationExtraLong3 is for very large transitions.

DurationExtraLong3 = 900 * time.Millisecond

// DurationExtraLong4 is the maximum standard duration.

DurationExtraLong4 = 1000 * time.Millisecond

)

// Spring damping ratio presets (from Jetpack Compose).

const (

// DampingHighBouncy produces very bouncy springs with many oscillations.

DampingHighBouncy float32 = 0.2

// DampingMediumBouncy produces medium bounce springs.

DampingMediumBouncy float32 = 0.5

// DampingLowBouncy produces springs with slight bounce.

DampingLowBouncy float32 = 0.75

// DampingNoBouncy produces critically damped springs with no bounce.

DampingNoBouncy float32 = 1.0

)

// Spring stiffness presets (from Jetpack Compose).

const (

// StiffnessHigh produces very fast springs.

StiffnessHigh float32 = 10000

// StiffnessMedium is the default balanced stiffness.

StiffnessMedium float32 = 1500

// StiffnessLow produces slow, gentle springs.

StiffnessLow float32 = 200

// StiffnessVeryLow produces very slow, dramatic springs.

StiffnessVeryLow float32 = 50

)