| // Copyright 2014 Google Inc. 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. |
| |
| (function(scope, testing) { |
| |
| function interpolate(from, to, f) { |
| if ((typeof from == 'number') && (typeof to == 'number')) { |
| return from * (1 - f) + to * f; |
| } |
| if ((typeof from == 'boolean') && (typeof to == 'boolean')) { |
| return f < 0.5 ? from : to; |
| } |
| |
| WEB_ANIMATIONS_TESTING && console.assert( |
| Array.isArray(from) && Array.isArray(to), |
| 'If interpolation arguments are not numbers or bools they must be arrays'); |
| |
| if (from.length == to.length) { |
| var r = []; |
| for (var i = 0; i < from.length; i++) { |
| r.push(interpolate(from[i], to[i], f)); |
| } |
| return r; |
| } |
| throw 'Mismatched interpolation arguments ' + from + ':' + to; |
| } |
| |
| scope.Interpolation = function(from, to, convertToString) { |
| return function(f) { |
| return convertToString(interpolate(from, to, f)); |
| } |
| }; |
| |
| if (WEB_ANIMATIONS_TESTING) { |
| testing.interpolate = interpolate; |
| } |
| |
| })(webAnimations1, webAnimationsTesting); |
