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50 lines
1.6 KiB
JavaScript
50 lines
1.6 KiB
JavaScript
// Copyright 2014 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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(function(scope, testing) {
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function interpolate(from, to, f) {
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if ((typeof from == 'number') && (typeof to == 'number')) {
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return from * (1 - f) + to * f;
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}
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if ((typeof from == 'boolean') && (typeof to == 'boolean')) {
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return f < 0.5 ? from : to;
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}
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WEB_ANIMATIONS_TESTING && console.assert(
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Array.isArray(from) && Array.isArray(to),
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'If interpolation arguments are not numbers or bools they must be arrays');
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if (from.length == to.length) {
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var r = [];
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for (var i = 0; i < from.length; i++) {
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r.push(interpolate(from[i], to[i], f));
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}
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return r;
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}
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throw 'Mismatched interpolation arguments ' + from + ':' + to;
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}
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scope.Interpolation = function(from, to, convertToString) {
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return function(f) {
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return convertToString(interpolate(from, to, f));
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}
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};
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if (WEB_ANIMATIONS_TESTING) {
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testing.interpolate = interpolate;
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}
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})(webAnimations1, webAnimationsTesting);
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