Chart_MAX_Price

ÿþ//+------------------------------------------------------------------+

//|                                                      ProjectName |

//|                                      Copyright 2020, CompanyName |

//|                                       http://www.companyname.net |

//+------------------------------------------------------------------+

#property copyright   "2009-2020, MetaQuotes Software Corp."

#property link        "http://www.mql5.com"

#property version     "1.0"

#property description "MAX_P"



#property indicator_chart_window

#property indicator_buffers 0

#property indicator_plots   0



#include <Canvas\Canvas.mqh>



CCanvas m_canvas;



//+------------------------------------------------------------------+

int OnInit()

  {

   if(!m_canvas.CreateBitmapLabel("MAX_P", 10, 60, 200, 60))

     {

      Alert("Error creating canvas: ", GetLastError());

      return (INIT_FAILED);

     }

   m_canvas.FontFlagsSet(FW_BOLD);

   m_canvas.FontSizeSet(45);



   return (INIT_SUCCEEDED);

  }



//+------------------------------------------------------------------+

//|                                                                  |

//+------------------------------------------------------------------+

void OnDeinit(const int reason)

  {

   m_canvas.Destroy(); // destroy canvas object

   ObjectDelete(0, "MAX_P"); // delete bitmap object from chart

   ChartRedraw(0);

  }









//+------------------------------------------------------------------+

//|                                                                  |

//+------------------------------------------------------------------+

void OnChartEvent(const int id,

                  const long& lparam,

                  const double& dparam,

                  const string& sparam

                 )

  {



   if(id==CHARTEVENT_CHART_CHANGE)

     {



      m_canvas.Erase(ColorToARGB(clrWhiteSmoke, 1)); // clear text



      long firstVisibleBar = ChartGetInteger(0,CHART_FIRST_VISIBLE_BAR,0); // first bar index on left border

      long allVisible = ChartGetInteger(0,CHART_VISIBLE_BARS,0); // number of visible bars on the screen

      int startBarIndex = (int)MathAbs(allVisible - firstVisibleBar); // an absolute number for the starting index 



      int highestI = iHighest(NULL, 0, MODE_HIGH, (int)allVisible, startBarIndex);

      int lowestI = iLowest(NULL, 0, MODE_LOW, (int)allVisible, startBarIndex);



      double a = (iHigh(NULL, 0, highestI) - iLow(NULL, 0, lowestI)) / _Point;



      m_canvas.TextOut(20, 10, DoubleToString(a, 0), clrRed);



      m_canvas.Update();

     }



  }



//+------------------------------------------------------------------+

//|                                                                  |

//+------------------------------------------------------------------+

int OnCalculate(const int rates_total,const int prev_calculated,

                const datetime &Time[],

                const double &Open[],

                const double &High[],

                const double &Low[],

                const double &Close[],

                const long &TickVolume[],

                const long &Volume[],

                const int &Spread[])

  {

// do nothng

   return(rates_total);

  }







//+------------------------------------------------------------------+