/**
 * @license
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { Hct } from '../hct/hct.js';
/**
 * Design utilities using color temperature theory.
 *
 * Analogous colors, complementary color, and cache to efficiently, lazily,
 * generate data for calculations when needed.
 */
export declare class TemperatureCache {
    input: Hct;
    constructor(input: Hct);
    hctsByTempCache: Hct[];
    hctsByHueCache: Hct[];
    tempsByHctCache: Map<Hct, number>;
    inputRelativeTemperatureCache: number;
    complementCache: Hct | null;
    get hctsByTemp(): Hct[];
    get warmest(): Hct;
    get coldest(): Hct;
    /**
     * A set of colors with differing hues, equidistant in temperature.
     *
     * In art, this is usually described as a set of 5 colors on a color wheel
     * divided into 12 sections. This method allows provision of either of those
     * values.
     *
     * Behavior is undefined when [count] or [divisions] is 0.
     * When divisions < count, colors repeat.
     *
     * [count] The number of colors to return, includes the input color.
     * [divisions] The number of divisions on the color wheel.
     */
    analogous(count?: number, divisions?: number): Hct[];
    /**
     * A color that complements the input color aesthetically.
     *
     * In art, this is usually described as being across the color wheel.
     * History of this shows intent as a color that is just as cool-warm as the
     * input color is warm-cool.
     */
    get complement(): Hct;
    /**
     * Temperature relative to all colors with the same chroma and tone.
     * Value on a scale from 0 to 1.
     */
    relativeTemperature(hct: Hct): number;
    /** Relative temperature of the input color. See [relativeTemperature]. */
    get inputRelativeTemperature(): number;
    /** A Map with keys of HCTs in [hctsByTemp], values of raw temperature. */
    get tempsByHct(): Map<Hct, number>;
    /**
     * HCTs for all hues, with the same chroma/tone as the input.
     * Sorted ascending, hue 0 to 360.
     */
    get hctsByHue(): Hct[];
    /** Determines if an angle is between two other angles, rotating clockwise. */
    static isBetween(angle: number, a: number, b: number): boolean;
    /**
     * Value representing cool-warm factor of a color.
     * Values below 0 are considered cool, above, warm.
     *
     * Color science has researched emotion and harmony, which art uses to select
     * colors. Warm-cool is the foundation of analogous and complementary colors.
     * See:
     * - Li-Chen Ou's Chapter 19 in Handbook of Color Psychology (2015).
     * - Josef Albers' Interaction of Color chapters 19 and 21.
     *
     * Implementation of Ou, Woodcock and Wright's algorithm, which uses
     * L*a*b* / LCH color space.
     * Return value has these properties:
     * - Values below 0 are cool, above 0 are warm.
     * - Lower bound: -0.52 - (chroma ^ 1.07 / 20). L*a*b* chroma is infinite.
     *   Assuming max of 130 chroma, -9.66.
     * - Upper bound: -0.52 + (chroma ^ 1.07 / 20). L*a*b* chroma is infinite.
     *   Assuming max of 130 chroma, 8.61.
     */
    static rawTemperature(color: Hct): number;
}