rxjs-create-tween/dist/index.js

Create observables that sample from easing functions on animation frames

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/***/ "./index.js":
/*!******************!*\
  !*** ./index.js ***!
  \******************/
/*! exports provided: createTween, default */
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "createTween", function() { return createTween; });
/* harmony import */ var rxjs__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! rxjs */ "rxjs");
/* harmony import */ var rxjs__WEBPACK_IMPORTED_MODULE_0___default = /*#__PURE__*/__webpack_require__.n(rxjs__WEBPACK_IMPORTED_MODULE_0__);
 // eslint-disable-line

/**
 * Creates an observable that emits samples from an easing function on every animation frame
 * for a duration `d` ms.
 *
 * The first value will be emitted on the next animation frame,
 * and is the value of the easing function at `t = 0`.
 * The final value is guaranteed to be the easing function at `t = d`.
 * The observable completes one frame after the final value was emitted.
 *
 * @param {function(t: number, b: number, c: number, d: number, [s]: number): number} easingFunction
 * - the easing fuction to sample from; can use any of Robert Penner's easing functions
     (without the `x` paramter)
 * @param {number} b - beginning value and 2nd parameter of the easing function
 * @param {number} c - change in value (or end value) and 3rd parameter of the easing function
 * @param {number} d - total duration of the tween in ms and 4th parameter of the easing function
 * @param {number} [s] - 5th parameter of the easing function (optional)
 * @return {Observable<number>} - an observable emitting samples of the easing function on
 *   animation frames for `d` ms.
 */

function createTween(easingFunction, b, c, d, s) {
  return rxjs__WEBPACK_IMPORTED_MODULE_0__["Observable"].create(function (observer) {
    var startTime;
    var id = requestAnimationFrame(function sample(time) {
      startTime = startTime || time;
      var t = time - startTime;

      if (t < d) {
        observer.next(easingFunction(t, b, c, d, s));
        id = requestAnimationFrame(sample);
      } else {
        observer.next(easingFunction(d, b, c, d, s));
        id = requestAnimationFrame(function () {
          return observer.complete();
        });
      }
    });
    return function () {
      if (id) {
        cancelAnimationFrame(id);
      }
    };
  });
}
/* harmony default export */ __webpack_exports__["default"] = (createTween);

/***/ }),

/***/ "rxjs":
/*!********************************************************************************!*\
  !*** external {"commonjs":"rxjs","commonjs2":"rxjs","amd":"rxjs","root":"Rx"} ***!
  \********************************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

module.exports = __WEBPACK_EXTERNAL_MODULE_rxjs__;

/***/ })

/******/ });
});
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