Drawing ruler from addon

[Powerbucker]

Hi,

I need draw the ruler clicking the mouse middle button.

On my addon, I've been implemented this

private DateTime startTime; // Para almacenar el tiempo inicial
private double startY; // Para almacenar el precio inicial

private void OnChartMouseDown(object sender, MouseButtonEventArgs e)
{
// Detecta si el botón del medio del ratón fue presionado
if (e.ChangedButton == MouseButton.Middle && sender is Chart chartWindow)
{
//Draw.Ruler_Isra
// chartControl te da el gráfico actual
outputLog(" Evento MouseDown en gráfico: " + chartWindow.Title);
//chartWindow. .AddDrawingTool<DrawingTools.Ruler>();

// Obtén la posición del ratón en el gráfico
Point mousePosition = e.GetPosition(chartWindow);

// Guarda el tiempo y el precio inicial
startTime = chartWindow.ActiveChartControl.GetTimeByX((int)mou sePosition.X); // Tiempo (DateTime)
startY = (int)mousePosition.Y;

outputLog($"Coordenadas MouseDown: Tiempo={startTime}, Precio={startY}");
}
}

private void OnChartMouseUp(object sender, MouseButtonEventArgs e)
{
// Detecta si el botón del medio del ratón fue presionado
if (e.ChangedButton == MouseButton.Middle && sender is Chart chartWindow)
{
outputLog("Evento MouseUp en gráfico: " + chartWindow.Title);

// Obtén la posición del ratón en el gráfico
Point mousePosition = e.GetPosition(chartWindow);

// Guarda el tiempo y el precio final
DateTime endTime = chartWindow.ActiveChartControl.GetTimeByX((int)mou sePosition.X); // Tiempo (DateTime)
int endY = (int)mousePosition.Y; // Precio (double)

outputLog($"Coordenadas MouseUp: Tiempo={endTime}, Precio={endY}");

// Dibuja el Ruler entre el punto de inicio y el punto final
Draw.Ruler(this, "RulerTool", true, startTime, startY, endTime, endY, endTime, endY);

outputLog("Ruler dibujado");
}

But I get an error on the line

Draw.Ruler(this, "RulerTool", true, startTime, startY, endTime, endY, endTime, endY);

Addon.cs	Argument 1: cannot convert from 'NinjaTrader.NinjaScript.AddOns.Addon' to 'NinjaTrader.NinjaScript.NinjaScriptBase'	CS1503	789	22

How can I fix it?

[NinjaTrader_Gaby]

Hello Powerbucker,

Thank you for your post.

Draw objects can only be called from indicators and strategies. If you want to use the ruler drawing tool from your AddOn script, you'll need to extract the OnRender code from the Ruler.cs DrawingTool script and reuse it.

Please let us know if you have any further questions.

[Powerbucker]

Hi,

Since I can't call the indicator from a strategy, I've thought about making an indicator and capturing the click event to draw the ruler.

But when I try to capture the event I get an error.

protected override void OnStateChange()
{
if (State == State.SetDefaults)
{
Description = @"Enter the description for your new custom Indicator here.";
Name = "RulerIndicator";
Calculate = Calculate.OnBarClose;
IsOverlay = false;
DisplayInDataBox = true;
DrawOnPricePanel = true;
DrawHorizontalGridLines = true;
DrawVerticalGridLines = true;
PaintPriceMarkers = true;
ScaleJustification = NinjaTrader.Gui.Chart.ScaleJustification.Right;
//Disable this property if your indicator requires custom values that cumulate with each new market data event.
//See Help Guide for additional information.
IsSuspendedWhileInactive = true;
}
else if (State == State.DataLoaded)
{
ChartControl.ChartPanels[0].MouseDown += OnChartMouseDown; //THIS LINE THROWS ERROR
}
else if (State == State.Terminated)
{
ChartControl.ChartPanels[0].MouseDown -= OnChartMouseDown;
}
}

private void OnChartMouseDown(object sender, MouseButtonEventArgs e)
{
// Detecta si el botón del medio del ratón fue presionado
if (e.ChangedButton == MouseButton.Middle && sender is Chart chartWindow)
{
...........
}
}


The error is:

12/09/2024 16:51:36	Default	Indicator 'RulerIndicator': Error on calling 'OnStateChange' method: Object reference not set to an instance of an object.

How should I do it?

[NinjaTrader_Gaby]

Hello Powerbucker,

The Help Guide states ChartControl should only be accessed when State is State.Historical. Likely it is null when you are trying to access it from State.DataLoaded.

"Warning: The ChartControl and its methods and properties should ONLY be access once the State has reached State.Historical"

https://ninjatrader.com/support/help...artcontrol.htm