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easing.v
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easing.v
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// Copyright (c) 2020 Leah Lundqvist. All rights reserved.
// Use of this source code is governed by a GPL license
// that can be found in the LICENSE file.
module ui
pub type EasingFunction fn(f32) f32
pub enum EasingType {
linear
ease_in_quad
ease_out_quad
ease_in_out_quad
ease_in_cubic
ease_out_cubic
ease_in_out_cubic
ease_in_quart
ease_out_quart
ease_in_out_quart
ease_in_quint
ease_out_quint
ease_in_out_quint
}
fn linear(x f32) f32 { return x }
fn ease_in_quad(x f32) f32 { return x * x }
fn ease_out_quad(x f32) f32 { return x*(2.0-x) }
fn ease_in_out_quad(x f32) f32 { return if x<.5 { 2.0*x*x } else { -1.0+(4.0-2.0*x)*x } }
fn ease_in_cubic(x f32) f32 { return x*x*x }
fn ease_out_cubic(x f32) f32 { return (x-1.0)*(x-1.0)*(x-1.0)+1 }
fn ease_in_out_cubic(x f32) f32 { return if x<.5 { 4.0*x*x*x } else { (x-1.0)*(2.0*x-2.0)*(2.0*x-2.0)+1.0 } }
fn ease_in_quart(x f32) f32 { return x*x*x*x }
fn ease_out_quart(x f32) f32 { return 1.0 - (x-1.0)*(x-1.0)*(x-1.0)*(x-1.0) }
fn ease_in_out_quart(x f32) f32 { return if x < 0.5 { 8.0*x*x*x*x } else { 1.0-8.0*(x-1.0)*(x-1.0)*(x-1.0)*(x-1.0) } }
fn ease_in_quint(x f32) f32 { return x*x*x*x*x }
fn ease_out_quint(x f32) f32 { return 1.0 + (x-1.0)*(x-1.0)*(x-1.0)*(x-1.0)*(x-1.0) }
fn ease_in_out_quint(x f32) f32 { return if x < 0.5 { 16.0*x*x*x*x*x } else { 1.0+16.0*(x-1.0)*(x-1.0)*(x-1.0)*(x-1.0)*(x-1.0) } }
pub fn easing(easingtype EasingType) EasingFunction {
match easingtype {
.linear { return linear }
.ease_in_quad { return ease_in_quad }
.ease_out_quad { return ease_out_quad }
.ease_in_out_quad { return ease_in_out_quad }
.ease_in_cubic { return ease_in_cubic }
.ease_out_cubic { return ease_out_cubic }
.ease_in_out_cubic { return ease_in_out_cubic }
.ease_in_quart { return ease_in_quart }
.ease_out_quart { return ease_out_quart }
.ease_in_out_quart { return ease_in_out_quart }
.ease_in_quint { return ease_in_quint }
.ease_out_quint { return ease_out_quint }
.ease_in_out_quint { return ease_in_out_quint }
else { return linear }
}
}