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Simple math equations and their applications on charts

  • #1
  • First Post: Oct 31, 2019 1:36am Oct 31, 2019 1:36am
Perpendicular Lines
if you are given any line (y − y1) = (m)(x − x1) on the chart, then its perpendicular equation is:
y − y1 = (-1/m)(x − x1)
Attached Image
each day 10%,,,, https://www.forexfactory.com/thread/1371538
  • #2
  • Nov 4, 2019 12:30pm Nov 4, 2019 12:30pm
Programmed example:
theory: FIBO is a linear equation with two anchors points b/w 100% drawn to 0%
we first draw Fibo, then draw perpendicular lines
each day 10%,,,, https://www.forexfactory.com/thread/1371538
  • #3
  • Nov 5, 2019 12:39pm Nov 5, 2019 12:39pm
Quoting Macd-rsi
Programmed example: theory: FIBO is a linear equation with two anchors points b/w 100% drawn to 0% we first draw Fibo, then draw perpendicular lines
if we use linear equations depending on price-time to determine the linear equation, it will not shown on chart correctly.
we have to assume chart in concept of "y-x" plane.

y = slope * x + intercept
y = m * x + b1
its perpendicular is y = - ( 1 / m ) * x + b2

how to convert from time-price domain to x-y domain using mt4 programming language?
each day 10%,,,, https://www.forexfactory.com/thread/1371538
  • #4
  • Last Post: Nov 5, 2019 4:14pm Nov 5, 2019 4:14pm
Quote
its perpendicular is y = - ( 1 / m ) * x + b2
sample:

Inserted Code
int OnInit()
 {
   EventSetTimer(2);
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
{
   EventKillTimer();
}
int x1=50;
int x0=10;
void OnTimer()
{
   ObjectDelete("FIBO");
   ObjectCreate(0,"FIBO",OBJ_TREND,0,Time[x1],a1,Time[x0],a0);
}
double slope=1;
void OnChartEvent(const int id, const long& lparam,   const double& dparam, const string& sparam)
{
   if(id==CHARTEVENT_OBJECT_DRAG)
   {
      int      x     =(int)lparam;
      int      y     =(int)dparam;
      int      X1     ;
      int      Y1     ;
      int      X0     ;
      int      Y0     ;
      datetime dt    =0;
      double   price =0;
      datetime dt1    =0;
      double   price1 =0;
      datetime dt2    =0;
      double   price2 =0;
      int      window=0;
      ChartXYToTimePrice(0,x,y,window,dt,price);
        {
      if(sparam=="FIBO")
      {
               double v1=ObjectGetDouble(0,"FIBO",OBJPROP_PRICE1,0);
               double v0=ObjectGetDouble(0,"FIBO",OBJPROP_PRICE2,0);
                datetime x1t=ObjectGetInteger(0,"FIBO",OBJPROP_TIME1,0);
                datetime x0t=ObjectGetInteger(0,"FIBO",OBJPROP_TIME2,0);
                x0=iBarShift(NULL,0,x0t);
                x1=iBarShift(NULL,0,x1t);
            if(v1>High[x1])
            {
               x1=iHighest(NULL,0,MODE_HIGH,10,x1-5);
               a1=High[x1];
            }
            if(v0>High[x0])
            {
               x0=iHighest(NULL,0,MODE_HIGH,10,x0-5);
               a0=High[x0];
            }
            if(v1<Low[x1])
            {
               x1=iLowest(NULL,0,MODE_LOW,10,x1-5);a1=Low[x1];
            }
            if(v0<Low[x0])
            {
               x0=iLowest(NULL,0,MODE_LOW,10,x0-5);
               a0=Low[x0];
            }
         }
         ObjectDelete("FIBO");
         ObjectCreate(0,"FIBO",OBJ_FIBO,0,Time[x1],a1,Time[x0],a0);
         v1=ObjectGetDouble(0,"FIBO",OBJPROP_PRICE1,x1);
         v0=ObjectGetDouble(0,"FIBO",OBJPROP_PRICE2,x0);
         x1t=ObjectGetInteger(0,"FIBO",OBJPROP_TIME1,x1);
         x0t=ObjectGetInteger(0,"FIBO",OBJPROP_TIME2,x0);
         ChartTimePriceToXY(0,0,x1t,v1,X1,Y1);
         ChartTimePriceToXY(0,0,x0t,v0,X0,Y0);
         Print(Y1-Y0);
         Print(X1-X0);
         x0=iBarShift(NULL,0,x0t);
         x1=iBarShift(NULL,0,x1t);
         if((Y1-Y0)!=0)
         double m1=-double(X1-X0)/double(Y1-Y0);
         if((X1-X0)!=0)
         double m0=double(Y1-Y0)/double(X1-X0);
         double b1=Y1-X1*m0;
         double b0=Y0-X0*m0;
         double p1=Y1-m1*X1;
         Print("slope=-(X1-X0)/(Y1-Y0)=("+DoubleToString(X1,0)+"-"+DoubleToString(X0,0)+")/("+DoubleToString(Y1,0)+"-"+DoubleToString(Y0,0)+")--> m1="+DoubleToString(m1,9)+" m0= "+(m0));
         int X2=X1+50;
         int Y2=m1*X2+p1;
         //y=m1*x+p1
         Print("b1="+DoubleToString(b1,9),"  p1=",DoubleToString(p1,9));
         ChartXYToTimePrice(0,X1,Y1,window,dt1,price1);
         ChartXYToTimePrice(0,X2,Y2,window,dt2,price2);
         ObjectDelete("gg");
         ObjectCreate(0,"gg",OBJ_TREND,0,dt1,price1,dt2,price2);
   }
}
//Print(TerminalInfoInteger(TERMINAL_SCREEN_DPI));
//Print(TerminalInfoInteger(TERMINAL_MQID));
}
double a1=High[44];
double a0=Low[11];
each day 10%,,,, https://www.forexfactory.com/thread/1371538
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