scratch-vm/src/util/math-util.js

class MathUtil {
    /**
     * Convert a value from degrees to radians.
     * @param {!number} deg Value in degrees.
     * @return {!number} Equivalent value in radians.
     */
    static degToRad (deg) {
        return deg * Math.PI / 180;
    }

    /**
     * Convert a value from radians to degrees.
     * @param {!number} rad Value in radians.
     * @return {!number} Equivalent value in degrees.
     */
    static radToDeg (rad) {
        return rad * 180 / Math.PI;
    }

    /**
     * Clamp a number between two limits.
     * If n < min, return min. If n > max, return max. Else, return n.
     * @param {!number} n Number to clamp.
     * @param {!number} min Minimum limit.
     * @param {!number} max Maximum limit.
     * @return {!number} Value of n clamped to min and max.
     */
    static clamp (n, min, max) {
        return Math.min(Math.max(n, min), max);
    }

    /**
     * Keep a number between two limits, wrapping "extra" into the range.
     * e.g., wrapClamp(7, 1, 5) == 2
     * wrapClamp(0, 1, 5) == 5
     * wrapClamp(-11, -10, 6) == 6, etc.
     * @param {!number} n Number to wrap.
     * @param {!number} min Minimum limit.
     * @param {!number} max Maximum limit.
     * @return {!number} Value of n wrapped between min and max.
     */
    static wrapClamp (n, min, max) {
        const range = (max - min) + 1;
        return n - (Math.floor((n - min) / range) * range);
    }


    /**
     * Convert a value from tan function in degrees.
     * @param {!number} angle in degrees
     * @return {!number} Correct tan value
     */
    static tan (angle) {
        angle = angle % 360;
        switch (angle) {
        case -270:
        case 90:
            return Infinity;
        case -90:
        case 270:
            return -Infinity;
        default:
            return parseFloat(Math.tan((Math.PI * angle) / 180).toFixed(10));
        }
    }
}

module.exports = MathUtil;