3 Bar Swing

//+------------------------------------------------------------------+
//|                                 3_bar_swing.mq4 |
//|                                       Zen_Leow |
//|                                             |
//+------------------------------------------------------------------+
#property copyright Zen_Leow
#property link     

#property indicator_chart_window

// The number of buffers for calculation, up to 8
#property indicator_buffers 2

// The color for displaying arrows
#property indicator_color1 Green      // Long signal
#property indicator_color2 Red       // Short signal

// Width of the arrows
#property indicator_width1 1 // Long signal arrow
#property indicator_width2 1 // Short signal arrow

extern int ArrowDistance = 3;

// Buffers for the calculations
double Up_Arrow_Buffer[];    // Long buffer for display
double Down_Arrow_Buffer[];   // Short buffer for display
//+------------------------------------------------------------------+
//| Custom indicator initialization function                  |
//+------------------------------------------------------------------+
int init()
{
   // SetIndexStyle - sets the new type, style, width and color for a given indicator line
   // SetIndexBuffer - binds the array variable declared at a global level to the custom indicator pre-defined buffer
   // SetIndexArrow - sets an arrow symbol for indicators line of the DRAW_ARROW type.
   SetIndexStyle(0, DRAW_ARROW);
   SetIndexBuffer(0, Up_Arrow_Buffer);
   SetIndexArrow(0, 233); // Up arrow
   SetIndexStyle(1, DRAW_ARROW);
   SetIndexBuffer(1, Down_Arrow_Buffer);
   SetIndexArrow(1, 234); // Down arrow
//----
   return(0);
 }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function               |
//+------------------------------------------------------------------+
int deinit()
 {
//----
   
//----
   return(0);
 }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                     |
//+------------------------------------------------------------------+
int start()
{
   int i;                   // Bar index     
   int Counted_bars;            // Number of counted bars
   //--------------------------------------------------------------------   
   Counted_bars=IndicatorCounted(); // Number of counted bars   
   i=Bars-Counted_bars-1;       // Index of the first uncounted   
   if (i == 0)
   {
     i = 2; // the newest signal bar is suppose to be at index 2
   }
   while(i 1)                // Loop for uncounted bars   
   {     
     if (isUpSwingBar(i))
     {
       Up_Arrow_Buffer[i] = Low[i] - (ArrowDistance * Point);
       Down_Arrow_Buffer[i] = EMPTY_VALUE;
     }
     else if (isDownSwingBar(i))
     {
       Down_Arrow_Buffer[i] = High[i] + (ArrowDistance * Point);
       Up_Arrow_Buffer[i] = EMPTY_VALUE;
     }
     else
     {
       Up_Arrow_Buffer[i] = EMPTY_VALUE;
       Down_Arrow_Buffer[i] = EMPTY_VALUE;
     }
     i--;
   }
//----
   return(0);
}

bool isUpSwingBar(int i)
{
   if (Low[i] Low[i+1] Low[i] Low[i-1] High[i] High[i+1] High[i] High[i-1])
   {
     return (true);
   }
   return (false);
}

bool isDownSwingBar(int i)
{
   if (Low[i] Low[i+1] Low[i] Low[i-1] High[i] High[i+1] High[i] High[i-1])
   {
     return (true);
   }
   return (false);
}
//+------------------------------------------------------------------+复制代码

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