arcade-physics/lib/math/angle/ShortestBetween.js

Use Arcade Physics without Phaser.

"use strict";
/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2020 Photon Storm Ltd.
 * @license      {@link https://opensource.org/licenses/MIT|MIT License}
 */
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Gets the shortest angle between `angle1` and `angle2`.
 *
 * Both angles must be in the range -180 to 180, which is the same clamped
 * range that `sprite.angle` uses, so you can pass in two sprite angles to
 * this method and get the shortest angle back between the two of them.
 *
 * The angle returned will be in the same range. If the returned angle is
 * greater than 0 then it's a counter-clockwise rotation, if < 0 then it's
 * a clockwise rotation.
 *
 * @function Phaser.Math.Angle.ShortestBetween
 * @since 3.0.0
 *
 * @param {number} angle1 - The first angle in the range -180 to 180.
 * @param {number} angle2 - The second angle in the range -180 to 180.
 *
 * @return {number} The shortest angle, in degrees. If greater than zero it's a counter-clockwise rotation.
 */
const ShortestBetween = (angle1, angle2) => {
    const difference = angle2 - angle1;
    if (difference === 0) {
        return 0;
    }
    const times = Math.floor((difference - -180) / 360);
    return difference - times * 360;
};
exports.default = ShortestBetween;
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