# All files / fast-colors/src color-interpolation.ts

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     import {
        hslToRGB,
        hsvToRGB,
        labToRGB,
        lchToRGB,
        rgbToHSL,
        rgbToHSV,
        rgbToLAB,
        rgbToLCH,
        rgbToXYZ,
        xyzToRGB,
    } from "./color-converters";
    import { ColorHSL } from "./color-hsl";
    import { ColorHSV } from "./color-hsv";
    import { ColorLAB } from "./color-lab";
    import { ColorLCH } from "./color-lch";
    import { ColorRGBA64 } from "./color-rgba-64";
    import { ColorXYZ } from "./color-xyz";
    import { lerp, lerpAnglesInDegrees } from "./math-utilities";

    /**
     * Interpolate by RGB color space
     *
     * @public
     */
    export function interpolateRGB(
        position: number,
        left: ColorRGBA64,
        right: ColorRGBA64
    ): ColorRGBA64 {
        Iif (isNaN(position) || position <= 0) {
            return left;
        } else Iif (position >= 1) {
            return right;
        }
        return new ColorRGBA64(
            lerp(position, left.r, right.r),
            lerp(position, left.g, right.g),
            lerp(position, left.b, right.b),
            lerp(position, left.a, right.a)
        );
    }

    /**
     * Interpolate by HSL color space
     *
     * @public
     */
    export function interpolateHSL(
        position: number,
        left: ColorHSL,
        right: ColorHSL
    ): ColorHSL {
        if (isNaN(position) || position <= 0) {
            return left;
        } else if (position >= 1) {
            return right;
        }
        return new ColorHSL(
            lerpAnglesInDegrees(position, left.h, right.h),
            lerp(position, left.s, right.s),
            lerp(position, left.l, right.l)
        );
    }

    /**
     * Interpolate by HSV color space
     *
     * @public
     */
    export function interpolateHSV(
        position: number,
        left: ColorHSV,
        right: ColorHSV
    ): ColorHSV {
        if (isNaN(position) || position <= 0) {
            return left;
        } else if (position >= 1) {
            return right;
        }
        return new ColorHSV(
            lerpAnglesInDegrees(position, left.h, right.h),
            lerp(position, left.s, right.s),
            lerp(position, left.v, right.v)
        );
    }

    /**
     * Interpolate by XYZ color space
     *
     * @public
     */
    export function interpolateXYZ(
        position: number,
        left: ColorXYZ,
        right: ColorXYZ
    ): ColorXYZ {
        if (isNaN(position) || position <= 0) {
            return left;
        } else if (position >= 1) {
            return right;
        }
        return new ColorXYZ(
            lerp(position, left.x, right.x),
            lerp(position, left.y, right.y),
            lerp(position, left.z, right.z)
        );
    }

    /**
     * Interpolate by LAB color space
     *
     * @public
     */
    export function interpolateLAB(
        position: number,
        left: ColorLAB,
        right: ColorLAB
    ): ColorLAB {
        if (isNaN(position) || position <= 0) {
            return left;
        } else if (position >= 1) {
            return right;
        }
        return new ColorLAB(
            lerp(position, left.l, right.l),
            lerp(position, left.a, right.a),
            lerp(position, left.b, right.b)
        );
    }

    /**
     * Interpolate by LCH color space
     *
     * @public
     */
    export function interpolateLCH(
        position: number,
        left: ColorLCH,
        right: ColorLCH
    ): ColorLCH {
        if (isNaN(position) || position <= 0) {
            return left;
        } else if (position >= 1) {
            return right;
        }
        return new ColorLCH(
            lerp(position, left.l, right.l),
            lerp(position, left.c, right.c),
            lerpAnglesInDegrees(position, left.h, right.h)
        );
    }

    /**
     * Color interpolation spaces
     *
     * @public
     */
    export enum ColorInterpolationSpace {
        RGB,
        HSL,
        HSV,
        XYZ,
        LAB,
        LCH,
    }

    /**
     * Interpolate by color space
     *
     * @public
     */
    export function interpolateByColorSpace(
        position: number,
        space: ColorInterpolationSpace,
        left: ColorRGBA64,
        right: ColorRGBA64
    ): ColorRGBA64 {
        if (isNaN(position) || position <= 0) {
            return left;
        } else Iif (position >= 1) {
            return right;
        }
        switch (space) {
            case ColorInterpolationSpace.HSL:
                return hslToRGB(interpolateHSL(position, rgbToHSL(left), rgbToHSL(right)));
            case ColorInterpolationSpace.HSV:
                return hsvToRGB(interpolateHSV(position, rgbToHSV(left), rgbToHSV(right)));
            case ColorInterpolationSpace.XYZ:
                return xyzToRGB(interpolateXYZ(position, rgbToXYZ(left), rgbToXYZ(right)));
            case ColorInterpolationSpace.LAB:
                return labToRGB(interpolateLAB(position, rgbToLAB(left), rgbToLAB(right)));
            case ColorInterpolationSpace.LCH:
                return lchToRGB(interpolateLCH(position, rgbToLCH(left), rgbToLCH(right)));
            default:
                return interpolateRGB(position, left, right);
        }
    }