Steema Central

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var Chart1;
	  
function draw() {
  Chart1=new Tee.Chart("canvas1");
  
  candle1 = new Tee.Candle();
  Chart1.addSeries(candle1);
  candle1.addRandom(20);
  
  msecsInADay=86400000; //24*60*60*1000
  candle1.data.x=new Array(candle1.count());
  var now=new Date(), tmp;
  for (t=0; t<candle1.count(); t++) {
	  tmp=new Date(now.getTime() + t * msecsInADay);
	  candle1.data.x[t] = tmp;
  }
  
  Chart1.legend.visible = false;
  
  myLineFunc1 = new MyLineFunc();
  Chart1.addSeries(myLineFunc1);
  myLineFunc1.data.source = candle1;
  myLineFunc1.fillFromDataSource();
  
  Chart1.draw();
}

MyLineFunc=function(o,o2) {
    Tee.Line.call(this,o,o2);
    
    this.fillFromDataSource=function() {
        if (this.data.source instanceof Tee.Series) {
            s = this.data.source;
            sum = s.data.close.reduce((a, b) => a + b, 0);  //sum of close values in the candle
            mean = sum / s.count();
            this.data.values = [mean, mean];
            this.data.x = [s.data.x[0], s.data.x[s.count()-1]];
        }
    }
}

MyLineFunc.prototype=new Tee.Line();