-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=2920

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function Init()
    indicator:name(" Swing Oscillator");
    indicator:description("");
    indicator:requiredSource(core.Bar);
    indicator:type(core.Oscillator);
	
	

    indicator.parameters:addGroup("Style");
	indicator.parameters:addColor("strong_color_up", "Color of Strong Swing", "", core.rgb(0, 255, 0));
	 indicator.parameters:addColor("weak_color_up", "Color of  Weak Swing", "", core.rgb(255, 0, 0));
	 indicator.parameters:addColor("strong_color_down", "Color of Strong Swing", "", core.rgb(0, 255, 0));
	 indicator.parameters:addColor("weak_color_down", "Color of  Weak Swing", "", core.rgb(255, 0, 0));
	indicator.parameters:addColor("Neutral", "Neutral Color","", core.rgb(128, 128, 128));
 
   indicator.parameters:addDouble("HSpace", "Horizontal Spacing (%)","",5, 0, 50); 
   
   
end 

local HSpace;
local  Neutral;
local strong_color_up, weak_color_up, strong_color_down,weak_color_down;

local SWING;
local Up, Down;
local UpOne, DownOne;
local DownOld, UpOld;
local Signal;
function Prepare(nameOnly)
 
    source = instance.source;
     first = source:first();	
	HSpace=(instance.parameters.HSpace/100);
	
   strong_color_up=instance.parameters.strong_color_up;
	weak_color_up=instance.parameters.weak_color_up;
	strong_color_down=instance.parameters.strong_color_down;
	weak_color_down=instance.parameters.weak_color_down;
   
  
   Neutral=instance.parameters.Neutral;
   
   local name = profile:id() .. " " .. source:name()  .. " : " .. source:barSize();
   instance:name(name );
   	if nameOnly then
		return;
	end
  
   instance:setLabelColor(Neutral);
   instance:ownerDrawn(true);
   
    Signal = instance:addInternalStream(0, 0);
	
	 
	
		
end



function Update(period, mode)

     if period == first then
  
  
		  if source.close[period] > source.open[period] then
		  SWING = "UP";	
		  UpOne=period;
		  Down=period;
		  else
		  SWING = "DOWN";	
		  DownOne=period;
		   Up=period;
		  end  
  end

    if period < first+3 or  not source:hasData(period) then
	return;
	end
	
	 period = period -1;
	
	    if source.close[period] >= source.open[period] and source.close[period-1] < source.open[period-1] then 
		SWING = "UP";		
		UpOne=period;
		Down=period-1;
			if DownOne~= nil then
			DownOld=DownOne-1;
			end
	    elseif source.close[period] <= source.open[period] and source.close[period-1] > source.open[period-1] then 
		SWING = "DOWN";		
		DownOne=period;		
		Up=period-1;
			if UpOne~= nil then
			UpOld=UpOne-1;
			end
		end
	
        if Down== nil or  Up == nil then
		return;
		end
		
		if DownOne== nil or  DownOne == nil then
		return;
		end
		
		
		if UpOld== nil or  DownOld == nil then
		return;
		end
	
		
		
			
		if SWING == "DOWN"then
				if 	 source.high[Up] - 	 source.low[UpOne-1] >   source.high[DownOld] - source.low[Down] then
				Signal[Up] =2;			
				else
				Signal[Up] =1;	
				end
		elseif  SWING == "UP"   then	
		        if 	     source.high[DownOne-1] - source.low[Down] > source.high[Up] - source.low[UpOld]   then    
				Signal[Down] =-2;	
		        else
				Signal[Down] =-1;	
				end
		end
	   
	
end

local init = false;

function Draw (stage, context)

    if stage  ~= 0 then
	return;
	end
	 
    

    local style = context.SINGLELINE + context.CENTER + context.VCENTER;
	 
  
   context:setClipRectangle(context:left(), context:top(), context:right(), context:bottom());
   
        if not init then
		     context:createPen (1, context.SOLID, 1, strong_color_up)       
			context:createSolidBrush(2, strong_color_up);
			
			 context:createPen (3, context.SOLID, 1, weak_color_up)       
			context:createSolidBrush(4, weak_color_up);
			
			context:createPen (5, context.SOLID, 1, strong_color_down)       
			context:createSolidBrush(6, strong_color_down);
			
			 context:createPen (7, context.SOLID, 1, weak_color_down)       
			context:createSolidBrush(8, weak_color_down);
			
			context:createPen (9, context.SOLID, 1, Neutral)       
			context:createSolidBrush(10, Neutral);
	 
            init = true;
        end
     
        
        local first = math.max(source:first(), context:firstBar ());
        local last = math.min (context:lastBar (), source:size()-1);
		
    
	    X0, X1, X2 = context:positionOfBar (source:size()-1); 
		 HCellSize =((X2-X1)/100)*HSpace;
		 
	
        local period;
		
			 for period= first, last, 1 do	   
			   x0, x1, x2 = context:positionOfBar (period);
			   
			
						
								
									 
										
												 
									         	        if Signal[period]==2  then	
 														C1=1; C2=2;
														elseif Signal[period] ==1  then		
														C1=3; C2=4;
														elseif Signal[period]==-2  then	
														C1=5; C2=6;
														elseif Signal[period] ==-1  then	
														C1=7; C2=8;
														else
														C1=9; C2=10;		
														end		 
															
													 
												     
									  
									   
			          	X1= x1+HCellSize;
                        X2= x2-HCellSize;
						
						if X1> x0 then
						X1= x0; 
						end
						
						if X2< x0 then
						X2= x0; 
						end
						
			           context:drawRectangle (C1, C2, X1, context:top(), X2, context:bottom()  );
			end					
				 
				
	
end