3 Price Break.afl
上传用户:shiqiang
上传日期:2009-06-12
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文件大小:6k
- //------------------------------------------------------------------------------
- //
- // Formula Name: 3 Price Break
- // Author/Uploader: Bhcombo
- // E-mail:
- // Date/Time Added: 2004-12-05 17:16:00
- // Origin:
- // Keywords: Three Price Break
- // Level: medium
- // Flags: indicator
- // Formula URL: http://www.amibroker.com/library/formula.php?id=413
- // Details URL: http://www.amibroker.com/library/detail.php?id=413
- //
- //------------------------------------------------------------------------------
- //
- // 3 Price Break can be used to verify trend and to set trailing stops.
- //
- // This is a work in progress. I pefer to see the 3PB lines graphed against a
- // candlestick chart versus the traditional 3PB representation. This will
- // graph the price break line as green in an uptrend and red in a down trend.
- // There are parameters for changing the number of price breaks (2 versus 3)
- // and the number of bars to use to begin the study. If you don't see a plot,
- // it is, probably because there are not enough bars to perform the study.
- //
- // To be corrected - the method used to determine the seed is not correct, but
- // it doesn't matter once the initial trend has been established.
- //
- //------------------------------------------------------------------------------
- Title = Name()+ " Price Break Indicator." ;
- //+ " Trend is " + Trend_Text + ". SEQUENCE IS " + Sequence_Text;
- Plot(C,Title,colorBlack,styleCandle);
- ///////// Parameters ////////
- nBars_To_Scan = Param("Number of bars to Scan",20, 10,480, 10); //Number of bars to include in scan
- PB_Interval = Param("Number of Bars for Price Break",3,2,3,1);
- ///////// Use Array of Prices and Price Breaks to Look Back and Determine What Price Break is For Current Bar
- Seedbar = nBars_To_Scan + 1; //Need an initial value to start the PB process
- if (BarCount > Seedbar) //Make sure there are enough bars available to evaluate
- {
-
- Price[0]= LastValue(Ref(C,-Seedbar)); //Seed the 0 Bar in the Array with Values
- Trend[0]=1; //1 = Long, 0=Short
- Sequence[0]=0; //Sequence counter - counts number of new price breaks
- Price_Break[0] = LastValue(Ref(C,-Seedbar));
- High_C1[0] = LastValue(Ref(C,-Seedbar)); //Highest Close 1 Ago
- High_C2[0]= LastValue(Ref(C,-Seedbar)); //Highest Close 2 Ago
- High_C3[0]= LastValue(Ref(C,-Seedbar)); //Highest Close 3 Ago
- Low_C1[0] = LastValue(Ref(C,-Seedbar)); //Lowest Close 1 Ago
- Low_C2[0] = LastValue(Ref(C,-Seedbar)); //Lowest Close 2 Ago
- Low_C3[0] = LastValue(Ref(C,-Seedbar)); //Lowest Close 3 Ago
-
- for ( i=1; i < Seedbar ; i++) //Cycle through prices filling in price array and caculating price breaks
- {
- Prior = i-1; //Index for Prior entry in array. Set the current array values to
- Trend[i]=Trend[Prior]; //prior values to make sure everything that isn't changed later
- Price_Break[i] = Price_Break[Prior]; //gets carried forward to the next row in the array.
- Low_C1[i] = Low_C1[Prior]; //Carryover current values
- Low_C2[i] = Low_C2[Prior];
- Low_C3[i] = Low_C3[Prior];
- High_C1[i] = High_C1[Prior]; //Carryover current values
- High_C2[i] = High_C2[Prior];
- High_C3[i] = High_C3[Prior];
- Sequence[i] = Sequence[Prior];
- Price[i] = LastValue (Ref (C,-(Seedbar-i))); //Seedbar is the bar just in front of where I start the method. Works since i starts at 1
- if (Price[i] >Price[Prior] AND Trend[Prior] == 1 ) // If Close is Greater than the prior close And the Trend is Long
- { if (Price[i] >High_C1[Prior]) //If the Close is greater than the last highest close
- { //Test For Price Break. The IIF is there to accomodate a 2 price or 3 price break option
- //based on the PB_Interval parameter
- Price_Break[i] = IIf(PB_Interval == 3,High_C3[Prior],IIf(PB_Interval == 2,High_C2[Prior],High_C3[Prior]));
- //The 3PB method says I take the highest close 4 ago as the new price break.
- Sequence[i] = Sequence[i] + 1; //Increment Sequence if Price Break
- High_C3[i] = High_C2[Prior]; //Stacking the higher closes like this avoids having to go back and iterate through the.
- High_C2[i] = High_C1[Prior]; //closes to find and count the higher closes. They are just carried forward in the stack.
- High_C1[i] = Price[i]; //When a higher close occurs, it is put on the top of the stack, each close below is
- } //pushed down in sequence, and the earliest (farthest back) close goes away.
- }
- if (Price[i] >Price[Prior] AND Trend[Prior] == 0 ) // If Close is Greater than the prior close And the Trend is Short
- { if (Price[i] >Price_Break[Prior]) //If Close > Price Break in trend is Short, Reverse and go Long
- {
- High_C1[i] = High_C2[i] = High_C3[i] = Price[i]; //Initialize sequence of new Highs
- Price_Break[i] = Price[i]; //Set new value for Price Break
- Trend[i] = 1; //Set the trend Long
- Sequence = 0;
- }
- }
- if (Price[i] <Price[Prior] AND Trend[Prior] ==0) // If The Close is less than the prior close And the Trend is Short
- { if (Price[i] <Low_C1[Prior]) //If the Close is less than the last lowest close
- {
- Price_Break[i] = IIf(PB_Interval == 3,Low_C3[Prior],IIf(PB_Interval == 2,Low_C2[Prior],Low_C3[Prior])); //Test For Price Break
- Sequence[i] = Sequence[i] + 1; //Increment Sequence if Price Break
- Low_C3[i] = Low_C2[Prior]; //Update sequence of new Lows
- Low_C2[i] = Low_C1[Prior];
- Low_C1[i] = Price [i];
- }
- }
- if (Price[i] <Price[Prior] AND Trend[Prior] ==1) // If The Close is less than the prior close And the Trend is Long
- { if (Price[i] < Price_Break[Prior]) //If Close < Price Break in Long Trend, reverse and go Short
- {
- Low_C1[i] = Low_C2[i] = Low_C3[i] = Price[i]; //Initialize sequence of new Lows
- Price_Break[i] = Price[i]; //Set new value for Price Break
- Trend[i] = 0; //Set Trend Short
- Sequence = 0;
- }
- }
- //// Plot the Price Breaks.
- Bar_x1=BarCount - (nBars_To_Scan - Prior );
- Bar_x2=BarCount - ( nBars_To_Scan - i);
- PB_Color = IIf(Trend[i] == 1,colorGreen, colorRed);
- Plot(LineArray(Bar_x1,Price_Break[i],Bar_x2,Price_Break[i],extend=0),"",PB_Color,styleThick);
- Sequence_Text = NumToStr(Sequence,format=1.0);
- Trend_Text = WriteIf(Trend[i] > 0, "Long","Short");
- } //Close the For Loop
- } //Close the first test for sufficient bars to do the study