Advanced - Straight Lines and Text in Paintbars
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. |
|
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;
}