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// Copyright 2012 The Closure Library 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.
/**
* @fileoverview A one dimensional linear interpolator.
*
*/
goog.provide('goog.math.interpolator.Linear1');
goog.require('goog.array');
goog.require('goog.math');
goog.require('goog.math.interpolator.Interpolator1');
/**
* A one dimensional linear interpolator.
* @implements {goog.math.interpolator.Interpolator1}
* @constructor
*/
goog.math.interpolator.Linear1 = function() {
/**
* The abscissa of the data points.
* @type {!Array.<number>}
* @private
*/
this.x_ = [];
/**
* The ordinate of the data points.
* @type {!Array.<number>}
* @private
*/
this.y_ = [];
};
/** @override */
goog.math.interpolator.Linear1.prototype.setData = function(x, y) {
goog.asserts.assert(x.length == y.length,
'input arrays to setData should have the same length');
if (x.length == 1) {
this.x_ = [x[0], x[0] + 1];
this.y_ = [y[0], y[0]];
} else {
this.x_ = x.slice();
this.y_ = y.slice();
}
};
/** @override */
goog.math.interpolator.Linear1.prototype.interpolate = function(x) {
var pos = goog.array.binarySearch(this.x_, x);
if (pos < 0) {
pos = -pos - 2;
}
pos = goog.math.clamp(pos, 0, this.x_.length - 2);
var progress = (x - this.x_[pos]) / (this.x_[pos + 1] - this.x_[pos]);
return goog.math.lerp(this.y_[pos], this.y_[pos + 1], progress);
};
/** @override */
goog.math.interpolator.Linear1.prototype.getInverse = function() {
var interpolator = new goog.math.interpolator.Linear1();
interpolator.setData(this.y_, this.x_);
return interpolator;
};
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