_SECTION_BEGIN("Trend Lines");
p1 = Param("TL 1 Periods", 20, 5, 50, 1);
p2 = Param("TL 2 Periods", 5, 3, 25, 1);
TL1 = LinearReg(C, p1);
TL2 = EMA(TL1, p2);
Col1 = IIf(TL1 > TL2, ParamColor("TL Up Colour", colorGreen), ParamColor("TL Dn Colour", colorRed));
Plot(TL1, "TriggerLine 1", Col1, styleLine|styleThick|styleNoLabel);
Plot(TL2, "TriggerLine 2", Col1, styleLine|styleThick|styleNoLabel);
_SECTION_END();

_SECTION_BEGIN("Linear Regression Channel");
//CyberMan's Linear Regression Channel.

//Linear Regression Line with 2 Standard Deviation Channels Plotted Above and Below 
//The original was written by Patrick Hargus, with critical hints from Marcin Gorzynski, Amibroker Technical Support 
//Wysiwyg coded the angle in degrees part
//I modified the original Linear Regression code so that the line will change color based on the degree of the Linear Regression slope.
//I combine this with my trading system.
//When my system gives an entry signal I look at the Linear Regression Line and I will only take long positions if the Linear Regression line is green and the entry price is below the LR line.
//When my system gives an entry signal I look at the Linear Regression Line and I will only take short positions if the Linear Regression line is red and the entry price is above the LR line.
//It is usefull for filtering out lower probability trades.


//================================================Start Chart Configuration============================================================================

SetChartOptions(0,chartShowArrows|chartShowDates);
_N(Title = StrFormat("{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%) Vol " +WriteVal( V, 1.0 ) +" {{VALUES}}", O, H, L, C, SelectedValue( ROC( C, 1 )) ));
SetChartBkGradientFill(ParamColor("Top", colorTeal), ParamColor("Bottom", colorLightGrey), ParamColor("Title", colorTeal));
SetChartBkColor(colorTeal);


Plot( C, "Close", colorWhite, styleCandle, Zorder = 1);
SetChartOptions(0,chartShowArrows | chartShowDates);

//================================================End Chart Configuration===============================================================================


//====================================Start of Linear Regression Code==================================================================================

P = ParamField("Price field",-1);

Length = 150;

Daysback = Param("Period for Liner Regression Line",Length,1,240,1);
shift = Param("Look back period",0,0,240,1);

//=============================== Math Formula ========================================================================================================

x = Cum(1);
lastx = LastValue( x ) - shift;
aa = LastValue( Ref(LinRegIntercept( p, Daysback), -shift) );
bb = LastValue( Ref(LinRegSlope( p, Daysback ), -shift) );
y = Aa + bb * ( x - (Lastx - DaysBack +1 ) );

//==================Plot the Linear Regression Line ====================================================================================================

LRColor = ParamColor("LR Color", colorCycle ); 
LRStyle = ParamStyle("LR Style");

LRLine =  IIf( x > (lastx - Daysback) AND BarIndex() < Lastx, y, Null );

LRStyle = ParamStyle("LR Style");
Angle = Param("Angle", 0.05, 0, 1.5, 0.01);// A slope higher than 0.05 radians will turn green, less than -0.05 will turn red and anything in between will be white.

LRLine = IIf( x > (lastx - Daysback) AND BarIndex() < Lastx, y, Null );

Pi = 3.14159265 * atan(1); // Pi
SlopeAngle = atan(bb)*(180/Pi);

LineUp = SlopeAngle > Angle;
LineDn = SlopeAngle < - Angle;

if(LineUp)
{
Plot(LRLine, "Lin. Reg. Line Up", IIf(LineUp, colorBrightGreen, colorWhite), LRStyle);
}
else
{
Plot(LRLine, "Lin. Reg. Line Down", IIf(LineDn, colorDarkRed, colorWhite), LRStyle);
} 

//==========================  Plot 1st SD Channel ======================================================================================================

SDP = Param("Standard Deviation", 1.5, 0, 6, 0.1);
SD = SDP/2;

width = LastValue( Ref(SD*StDev(p, Daysback),-shift) ); //Set width of inside chanels here.
SDU = IIf( x > (lastx - Daysback) AND BarIndex() < Lastx, y+width , Null ) ;
SDL = IIf( x > (lastx - Daysback) AND BarIndex() < Lastx, y-width , Null ) ;

SDColor = ParamColor("SD Color", colorCycle );
SDStyle = ParamStyle("SD Style");

Plot( SDU , "Upper Lin Reg", colorWhite,SDStyle ); //Inside Regression Lines
Plot( SDL , "Lower Lin Reg", colorWhite,SDStyle ); //Inside Regression Lines

//==========================  Plot 2d SD Channel ========================================================================================================

SDP2 = Param("2d Standard Deviation", 2.0, 0, 6, 0.1);
SD2 = SDP2/2;

width2 = LastValue( Ref(SD2*StDev(p, Daysback),-shift) ); //Set width of outside chanels here. 
SDU2 = IIf( x > (lastx - Daysback) AND BarIndex() < Lastx, y+width2 , Null ) ;
SDL2 = IIf( x > (lastx - Daysback) AND BarIndex() < Lastx, y-width2 , Null ) ;

SDColor2 = ParamColor("2 SD Color", colorCycle );
SDStyle2 = ParamStyle("2 SD Style");

Plot( SDU2 , "Upper Lin Reg", colorWhite,SDStyle2 ); //OutSide Regression Lines
Plot( SDL2 , "Lower Lin Reg", colorWhite,SDStyle2 ); //OutSide Regression Lines

Trend = IIf(LRLine > Ref(LRLine,-1),colorGreen,colorRed);//Changes LR line to green if sloping up and red if sloping down.

Plot( LRLine , "LinReg", Trend, LRSTYLE );

//============================ End Indicator Code ========================================================================================================