File: src\interpolator\class.interpolator.linear.js
/*
* Copyright (c) 2014 Gwennael Buchet
*
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* of the Software.
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/**
* Linear intepolation
* @module Animation
* @class CGSGInterpolatorLinear
* @extends {CGSGInterpolator}
* @constructor
* @author Gwennael buchet (gwennael.buchet@gmail.com)
*/
var CGSGInterpolatorLinear = CGSGInterpolator.extend(
{
initialize : function() {
},
/**
* @method compute
* @param keys {Array} Array of all the animation keys
* @param steps {Array} Array of steps between 2 keys. steps.length = keys.length - 1.
* @return {Array} Array of {x, y} object corresponding to all the points in the curve
*/
compute : function(keys, steps) {
var k, s, lenk = keys.length, lens, frame, key, nextKey, stepX, stepY;
var values = [];
for (k = 0 ; k < lenk - 1 ; k++) {
key = keys[k];
nextKey = keys[k + 1];
lens = steps[k];
stepX = (nextKey.value.x - key.value.x) / steps[k];
stepY = (nextKey.value.y - key.value.y) / steps[k];
for (s = 0 ; s < lens ; s++) {
frame = s;
if (frame === key.frame) {
values.push({x : key.value.x, y : key.value.y});
}
else if (frame === nextKey.frame) {
values.push({x : nextKey.value.x, y : nextKey.value.y});
}
else {
values.push({x : keys[k].value.x + s * stepX, y : keys[k].value.y + s * stepY});
}
}
}
var lk = keys[lenk - 1];
values.push({x : lk.value.x, y : lk.value.y});
return values;
}
}
);