Modify ZigZak Function need

Dear Developer,

I need someone create for me zigzak function. I need a function that send me zigzak points price. function look like :

double ZikzakPrice(int ZigzakPoint, int InpDepth, int InpDeviation, int InpBackstep){
  
  //-------------------------------
    here the code
  //-------------------------------   
  
}

ZigzakPoint : number of zigzak point's price will return. see the picture. example if i set 2 then function will return number 2 zikzak points price.

InpDepth, InpDeviation,InpBackstep :  This is zigzak parameter. 

1. Let me told you function calculation start from latest bar to previous bar untill my define number point . because i need later points bar.

2. Original Zikzak indicator calculation start from previous to latest bars. i don't work like that.