material-motion
Version:
Makes it easy to add rich, interactive motion to your application.
42 lines • 1.72 kB
JavaScript
/** @license
* Copyright 2016 - present The Material Motion Authors. All Rights Reserved.
*
* 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 { isDefined, } from '../typeGuards';
export function withToPolar(superclass) {
return class extends superclass {
toPolar({ origin$ }) {
if (!isDefined(origin$)) {
origin$ = arguments[0];
}
return this._reactiveMap({
transform({ upstream, origin }) {
const deltaX = upstream.x - origin.x;
const deltaY = upstream.y - origin.y;
return {
// Inlining Pythagorean theorem instead of using `combineLatest` +
// `distanceFrom`, both for simplicity and to avoid emitting twice
// for each upstream emission.
distance: Math.sqrt(Math.pow(deltaX, 2) + Math.pow(deltaY, 2)),
angle: Math.atan2(deltaY, deltaX),
};
},
inputs: {
origin: origin$,
},
});
}
};
}
//# sourceMappingURL=toPolar.js.map