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// 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);
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