Dynamic trend

// +------------------------------------------------------------------+ 
// | The percentage indicator basis on break | 
// | of the dynamic price channel | 
// | BDPC_Percent.mq4 | 
// | Copyright © 2004, OfficeFX Group | 
// | http: // officefx.nm.ru | 
// +------------------------------------------------------------------+ 
#property copyright " Copyright © 2004, OfficeFX Group " 
#property link " http:// officefx.nm.ru " 

#property indicator_chart_window 
#property indicator_buffers 3 
#property indicator_color1 Yellow // BUY signal 
#property indicator_color2 Blue // BUY signal 
#property indicator_color3 Red // SELL signal 
//----Indicator Buffers--------------------------------------------+ 
double DynamicLineTrend []; // Data buffer for dynamic line trend 
double BUYSignals []; // Data buffer for BUY signals 

double SELLSignals []; // Data buffer for SELL signals //----User defines-------------------------------------------------
+ extern int Percent=15; // Percent dynamic channel extern int MaxPeriod=50;
 // Maximal period for calculate trend 
 //----Variables----------------------------------------------------+ 
 int Sshift=0; 
 // Current bar for calculate trend // 
+------------------------------------------------------------------+ 
// | Custom indicator initialization function | // +
------------------------------------------------------------------+ int init () {
//----Indicators---------------------------------------------------+ 
SetIndexStyle (0, DRAW_LINE); SetIndexBuffer (0, DynamicLineTrend); 
SetIndexStyle 
(1, DRAW_ARROW); SetIndexArrow (1,233); SetIndexBuffer (1, BUYSignals); 
SetIndexStyle 
(2, DRAW_ARROW); SetIndexArrow (2,234); SetIndexBuffer (2, SELLSignals)
; //-
-----------------------------------------
-------------------------+
 return (0);} 
// +------------------------------------------------------------------+ 
// | Custom indicator iteration function |
 // +------------------------------------------------------------------+ 
 int start () 
 {  // Get digits of Symbol 
 double Point=MarketInfo (Symbol (), MODE_POINT); 
// Set count bars for calculate trend int Counted_Bars=IndicatorCounted ()-MaxPeriod; 
//----Calculation DynamicLineTrend---------------------------------+
 for ( Shift = Counted_Bars; Shift> =0; Shift-) {
// Calculate of maximal period 
if (Close [Shift] <DynamicLineTrend [Shift+1]) {

// Calculate Upper trend DynamicLineTrend [Shift] =Close [Highest (NULL, 0, MOD
E_CLOSE, MaxPeriod, Shift+1)]-Percent*Point;}; if (Close [Shift]> =DynamicLineTren
d [Shift+1]) {
// Calculate Down trend Dynamic
LineTrend [Shift] =Clo
se [Lowest (NULL, 0, MODE_
CLOSE, MaxPeriod, Shift+1)] +Percent*Point;}; 
// Check 
crosses DynamicLineTrend and Price if (Close [Shift+3]> DynamicLineTrend [Shift+2]) if (Close [Shift+2] <
DynamicLineTrend [Shift+3]) BUYSignals [Shift] =Low [Shift]-10*Point;
 else BUYSignals [Shift] =0; else BUYSignals [Shift] =0;
 if (Close [Shift+2] <DynamicLineTrend [Shift+1]) 
if (Close [Shift+2]> DynamicLineTrend [Shift+3]) SELLSignals [Shift
] =High [Shift]-10*Point; else SELLSignals [Shift] =0; else SELLSignals [Shift] =0;}; 
//-------------------------------------------------------------------+ 
return (0);} // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++