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MQL5 Reference
Constants, Enumerations and Structures
Indicator Constants
Custom Indicator Properties

Custom Indicator Properties

Custom Indicators Properties

The number of indicator buffers that can be used in a custom indicator is unlimited. But for each array, which is designated as the indicator buffer using the SetIndexBuffer() function, it’s necessary to specify the data type that it will store. This may be one of the values of the ENUM_INDEXBUFFER_TYPE enumeration.

ENUM_INDEXBUFFER_TYPE

IDDescription
INDICATOR_DATAData to draw
INDICATOR_COLOR_INDEXColor
INDICATOR_CALCULATIONSAuxiliary buffers for intermediate calculations

A custom indicator has a lot of settings to provide convenient displaying. These settings are made through the assignment of corresponding indicator properties using functions IndicatorSetDouble(), IndicatorSetInteger() and IndicatorSetString(). Identifiers of indicator properties are listed in the ENUM_CUSTOMIND_PROPERTY enumeration.

ENUM_CUSTOMIND_PROPERTY_INTEGER

IDDescriptionProperty type
INDICATOR_DIGITSAccuracy of drawing of indicator valuesint
INDICATOR_HEIGHTFixed height of the indicator’s window (the preprocessor command #property indicator_height)int
INDICATOR_LEVELSNumber of levels in the indicator windowint
INDICATOR_LEVELCOLORColor of the level linecolor modifier = level number
INDICATOR_LEVELSTYLEStyle of the level lineENUM_LINE_STYLE modifier = level number
INDICATOR_LEVELWIDTHThickness of the level lineint modifier = level number
INDICATOR_FIXED_MINIMUMFixed minimum for the indicator window. The property can only be written by the IndicatorSetInteger() functionbool
INDICATOR_FIXED_MAXIMUMFixed maximum for the indicator window. The property can only be written by the IndicatorSetInteger() functionbool

ENUM_CUSTOMIND_PROPERTY_DOUBLE

IDDescriptionProperty type
INDICATOR_MINIMUMMinimum of the indicator windowdouble
INDICATOR_MAXIMUMMaximum of the indicator windowdouble
INDICATOR_LEVELVALUELevel valuedouble modifier = level number

ENUM_CUSTOMIND_PROPERTY_STRING

IDDescriptionProperty type
INDICATOR_SHORTNAMEShort indicator namestring
INDICATOR_LEVELTEXTLevel descriptionstring modifier = level number

Examples:

//--- indicator settings
#property indicator_separate_window
#property indicator_buffers 4
#property indicator_plots   2
#property indicator_type1   DRAW_LINE
#property indicator_type2   DRAW_LINE
#property indicator_color1  clrLightSeaGreen
#property indicator_color2  clrRed
//--- input parameters
extern int KPeriod=5;
extern int DPeriod=3;
extern int Slowing=3;
//--- indicator buffers
double MainBuffer[];
double SignalBuffer[];
double HighesBuffer[];
double LowesBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
void OnInit()
  {
//--- indicator buffers mapping
   SetIndexBuffer(0,MainBuffer,INDICATOR_DATA);
   SetIndexBuffer(1,SignalBuffer,INDICATOR_DATA);
   SetIndexBuffer(2,HighesBuffer,INDICATOR_CALCULATIONS);
   SetIndexBuffer(3,LowesBuffer,INDICATOR_CALCULATIONS);
//--- set accuracy
   IndicatorSetInteger(INDICATOR_DIGITS,2);
//--- set levels
   IndicatorSetInteger(INDICATOR_LEVELS,2);
   IndicatorSetDouble(INDICATOR_LEVELVALUE,0,20);
   IndicatorSetDouble(INDICATOR_LEVELVALUE,1,80);
//--- set maximum and minimum for subwindow
   IndicatorSetDouble(INDICATOR_MINIMUM,0);
   IndicatorSetDouble(INDICATOR_MAXIMUM,100);
//--- sets first bar from which index will be drawn
   PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,KPeriod+Slowing-2);
   PlotIndexSetInteger(1,PLOT_DRAW_BEGIN,KPeriod+Slowing+DPeriod);
//--- set style STYLE_DOT for second line
   PlotIndexSetInteger(1,PLOT_LINE_STYLE,STYLE_DOT);
//--- name for DataWindow and indicator subwindow label
   IndicatorSetString(INDICATOR_SHORTNAME,"Stoch("+KPeriod+","+DPeriod+","+Slowing+")");
   PlotIndexSetString(0,PLOT_LABEL,"Main");
   PlotIndexSetString(1,PLOT_LABEL,"Signal");
//--- sets drawing line to empty value
   PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,0.0);
   PlotIndexSetDouble(1,PLOT_EMPTY_VALUE,0.0);
//--- initialization done
  }
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Drawing StylesIndicator Types