SetIndexDrawBegin Function HELP

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korhan.x
15
korhan.x  
Hello,
I'd really appreciate if someone can help me to understand the features of this function. It's especially burdensome in ichimoku kinko hyo coding. Here's the code part. (indise init function)

a_begin=Kijun; if(a_begin<Tenkan) a_begin=Tenkan;
   SetIndexStyle(2,DRAW_HISTOGRAM,STYLE_DOT);
   SetIndexBuffer(2,SpanA_Buffer);
   SetIndexDrawBegin(2,Kijun+a_begin-1);
   SetIndexShift(2,Kijun);
   SetIndexLabel(2,NULL);

and the second part:

   SetIndexStyle(3,DRAW_HISTOGRAM,STYLE_DOT);
   SetIndexBuffer(3,SpanB_Buffer);
   SetIndexDrawBegin(3,Kijun+Senkou-1);
   SetIndexShift(3,Kijun);
   SetIndexLabel(3,NULL);

As you see in drawing of Senkou Span A, drawing begins from 2*Kijun before the current bar, and for Senkou Span B it's far more behind, Kijun + Senkou . Why do we use such a function, what is its exact purpose? Is it necessary in the code part?


Thanks already for your help.
Korhan
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