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function Trend(maxPoints, stepSize) {
this.maxPoints = maxPoints;
this.trends = {};
this.times = new Array(maxPoints);
var i, t = (new Date()).getTime(), stepMs = stepSize * 1000;
for(i = maxPoints - 1; i >= 0; i--) { t -= stepMs; this.times[i] = t; }
}
Trend.prototype.addPoints = function(now,values) {
this.times.push(now);
var name, i;
for (name in values) {
var points = this.trends[name];
if(!points) {
points = new Array(this.maxPoints);
for(i = 0; i < this.maxPoints; i++) points[i] = 0;
this.trends[name] = points;
}
points.push(values[name]);
points.shift();
}
this.times.shift();
}
Trend.prototype.after = function(tval) {
var res = new Trend(0,0);
res.maxPoints = this.maxPoints;
for(var i = 0; i < this.times.length; i++) {
var t = this.times[i];
if(tval < t) {
res.times.push(t);
for (var name in this.trends) {
var val = this.trends[name][i];
var trend = res.trends[name];
if(!trend) {
trend = [];
res.trends[name] = trend;
}
trend.push(val);
}
}
}
return res;
}
Trend.prototype.remove = function(name) {
delete this.trends[name];
}
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