//
//  MathHelpers.swift
//  SheetImagePicker
//
//  Created by Shadowfacts on 9/24/19.
//  Copyright © 2019 Shadowfacts. All rights reserved.
//

import UIKit

func clamp(_ value: CGFloat, from: CGFloat, to: CGFloat) -> CGFloat {
    if value < from {
        return from
    } else if value > to {
        return to
    } else {
        return value
    }
}

func smoothstep(value: CGFloat, from: CGFloat, to: CGFloat) -> CGFloat {
    let x = clamp((value - from) / (to - from), from: 0, to: 1)
    // 3x^2 - 2x^3
    return 3 * pow(x, 2) - 2 * pow(x, 3)
}

func lerp(_ value: CGFloat, min: CGFloat, max: CGFloat, from: CGFloat, to: CGFloat) -> CGFloat {
    let value = clamp((value - min) / (max - min), from: 0, to: 1)
    return value * (to - from) + from
}