Advanced - Straight Lines and Text in Paintbars

Contents

A paintbar can draw straight lines on the chart and annotate them with text. It is done using the SetLine function in Advanced mode and RemoveLine if at a later point paintbar needs to remove it. RemoveAllLines would remove every line from the chart.

public void SetLine(double ID, Color color, double x1, double y1, double x2, double y2, int width = 1, string text = null, LineTextPosition textposition = LineTextPosition.RightAbove, double fontMult = 1)

public void SetLine(double ID, Color color, DateTime T1, double y1, DateTime T2, double y2, int width = 1, string text = null, LineTextPosition textposition = LineTextPosition.RightAbove, double fontMult = 1)

ID	a unique identifier for the line. This would vary depending on how you define the lines. For example, if you know that your lines will never start at the same X position on the left, you can just use the line's left anchor's X coordinate as an ID.
color	the line's color. Can be Color, SysColor or an hex representation of the color - same as with the SetColor function
x1 or T1	the X or Timestamp coordinate of the first anchor of the line. NOTE: the X coordinates of the line are in candle numbers' units. Each candle on the chart is numbered, so if you want the line to start at the current candle, you would use the CandleNumber property. If you want it to start 3 candles before the current one, set it to CandleNumber-3. The Timestamp coordinates are just the UTC (note: UTC!) date/timestamps of the line anchors
y1	the price Y coordinate of the first anchor of the line
x2,y2	the coordinates for the second anchor
width	width of the line, in pixels.
text	the text with which the line is annotated. If no text, specify null
textposition	where on the line the text goes.
fontMult	font size multiplier. If set to 1, the text will be same size as other text on the chart. 0.5 would make it half as big, etc.

Example - draw High/Low lines every X minutes

double PeriodHigh;

double PeriodLow;

double PrevPeriod;

int PeriodStart;

public void MainCalculation()

{

if (CandleNumber == 0) // just starting the paintbar

PrevPeriod = -1;

var MinFromSessionStart = (Timestamp - TradingDay.SessionStart).Ticks / TimeSpan.TicksPerMinute; // minutes from start of session

if (MinFromSessionStart < 0) return; // only do regular trading hours

DefinePaintbarParameter("Period", "Minutes", true, 5, 1000, 1, 30);

var min = Convert.ToInt32(GetPaintbarParameter("Period"));

var Period = MinFromSessionStart / min; // current period number

if (Period != PrevPeriod) // if period changed, reset the period values

{

PeriodHigh = High;

PeriodLow = Low;

PeriodStart = CandleNumber;

PrevPeriod = Period;

}

PeriodHigh = Math.Max(PeriodHigh, High); // update the period's high and low

PeriodLow = Math.Min(PeriodLow, Low);

Color HColor = GetNamedColor("High", SysColor.MainIndicator1);

// set the high line

SetLine(TradingDay.DayNumber * 1000 + Period, HColor, PeriodStart, PeriodHigh, CandleNumber + 1, PeriodHigh, 1, "H", LineTextPosition.RightAbove, 0.8);

Color LColor = GetNamedColor("Low", SysColor.MainIndicator2);

// set the low line

SetLine(TradingDay.DayNumber * 2000 + Period, LColor, PeriodStart, PeriodLow, CandleNumber + 1, PeriodLow, 1, "L", LineTextPosition.RightBelow, 0.8);

}

Example - draw Pivot Support/Resistance every X minutes

double PrevHigh;

double PrevLow;

double PrevClose;

double PrevPeriod;

int PeriodStart;

public void MainCalculation()

{

if (CandleNumber == 0) // just starting

{

PrevPeriod = -1; PrevHigh = 0;

}

var MinFromSessionStart = (Timestamp - TradingDay.SessionStart).Ticks / TimeSpan.TicksPerMinute;

if (MinFromSessionStart < 0) return;

DefinePaintbarParameter("Period", "Minutes", true, 5, 1000, 1, 30);

var min = Convert.ToInt32(GetPaintbarParameter("Period"));

var Period = MinFromSessionStart / min;

if (Period != PrevPeriod)

{

PrevHigh = High;

PrevLow = Low;

PrevClose = Close;

PeriodStart = CandleNumber;

PrevPeriod = Period;

}

if (Period != 0)

{

var Pivot = (PrevHigh + PrevLow + PrevClose) / 3;

Color R1Color = GetNamedColor("R1", SysColor.MainIndicator1);

SetLine(TradingDay.DayNumber * 1000 + Period, R1Color,

PeriodStart, 2 * Pivot - PrevLow,

CandleNumber + 1, 2 * Pivot - PrevLow,

1, "R1", LineTextPosition.RightAbove, 0.8);

Color S1Color = GetNamedColor("S1", SysColor.MainIndicator2);

SetLine(TradingDay.DayNumber * 2000 + Period, S1Color,

PeriodStart, 2 * Pivot - PrevHigh,

CandleNumber + 1, 2 * Pivot - PrevHigh,

1, "S1", LineTextPosition.RightBelow, 0.8);

}

PrevHigh = Math.Max(PrevHigh, High);

PrevLow = Math.Min(PrevLow, Low);

PrevClose = Close;

}