How to get the time and price of mouse point clicked on chart?

[jjhou]

I though it's very easy and many people should've written about it, but after searching in forum, I found nothing useful in NT8. Help me please.

[NinjaTrader_JessicaP]

It may be that the reason you are unable to find many resources is because these features were not documented in NinjaTrader 7. Fortunately, NinjaTrader 8 has improved support for mouse events and treating charts both as pixel width by pixel height grids, and as time by price grids.

First, to capture mouse events, you should review this section, and then create code which prints to the New -> NinjaScript Output Window, which lets you know you are successfully capturing mouse events.

http://ninjatrader.com/support/helpGuides/nt8/en-us/onmousemove.htm?zoom_highlightsub=mousemove

Once you have done so, you can see that one of the objects you have available to you in your OnMouseMove event handler is a ChartPanel object. Documentation for retrieving time, price, x, and y coordinates for ChartPanels can be found here

http://ninjatrader.com/support/helpGuides/nt8/en-us/chartpanel.htm

http://ninjatrader.com/support/helpGuides/nt8/en-us/gettimebyx.htm

http://ninjatrader.com/support/helpGuides/nt8/en-us/getvaluebyy.htm

We are happy to help with any specific questions that come up.

[grose]

I only recently began writing indicators in NT8. I was looking to work with the price, time and bar index of the bar I clicked on with the mouse. Oddly enough, when I started working with the Time[] array, I happened to experience that, on a live chart, if I did a loop to print the last n Time values, it wouldn't go past 15 for the barsAgo parameter. In addition, the values were way off. The code is in a MouseClicked event handler that is added to the chart when the state is historical. Other values returned in the event are fine. There is the output - as of 16 bars ago, I get that the object is not set to a valid reference. Are the charts basic price and time arrays not available in a mouse handler? Thanks.

Bars ago: 32
Time test 0: 11/20/2019 6:00:00 PM
Time test 1: 11/20/2019 4:45:44 PM
Time test 2: 11/20/2019 4:45:44 PM
Time test 3: 11/20/2019 4:45:44 PM
...<snip>
Time test 14: 11/20/2019 4:45:44 PM
Time test 15: 11/20/2019 4:45:44 PM
Time test didn't work: Object reference not set to an instance of an object.

The code basically is:

protected override void OnStateChange()
{
if (State == State.SetDefaults)
{
<snip>
}
else if (State == State.Historical)
{
if (ChartControl != null)
{
foreach (ChartScale scale in ChartPanel.Scales)
if (scale.ScaleJustification == ScaleJustification)
chartScale = scale;

Print("Adding mouse event");
ChartControl.MouseLeftButtonDown += MouseClicked;
}
}
else if (State == State.Terminated)
{
if (ChartControl != null)
ChartControl.MouseLeftButtonDown -= MouseClicked;
}
}

and the handler

protected void MouseClicked(object sender, MouseButtonEventArgs e)
{
// convert e.GetPosition for different dpi settings
clickPoint.X = ChartingExtensions.ConvertToHorizontalPixels(e.Get Position(ChartControl as IInputElement).X, ChartControl.PresentationSource);
clickPoint.Y = ChartingExtensions.ConvertToVerticalPixels(e.GetPo sition(ChartControl as IInputElement).Y, ChartControl.PresentationSource);

// -- value is incorrect
convertedPrice = Instrument.MasterInstrument.RoundToTickSize(chartS cale.GetValueByY((float)clickPoint.Y));

// -- valoue is correct
convertedTime = ChartControl.GetTimeBySlotIndex((int)ChartControl. GetSlotIndexByX((int)clickPoint.X));

int barIdx = 0;
if (ChartControl != null)
{
ChartControl chart = ChartControl;
barIdx = ChartBars.GetBarIdxByX(chart, (int)clickPoint.X);
Print("barIdx: " + barIdx.ToString());

Print("Bars.Count(): " + Bars.Count.ToString());

if (ChartBars != null)
{
Print("From: " + ChartBars.FromIndex.ToString());
Print("To: " + ChartBars.ToIndex.ToString());
}

int barsAgo = (Bars.Count - barIdx - 1);
Print("Bars ago: " + barsAgo.ToString());

try
{
for (int c = 0; c < Bars.Count; c++)
{
Print("Time test " + c.ToString() + ": " + Time[c].ToString());
}
}
catch (Exception e3)
{
Print("Time test didn't work: " + e3.Message);
}


}

Thanks,

Gordon

[NinjaTrader_ChelseaB]

Hello grose,

Below is a link to an example of printing the price and time from mouse click points.

https://ninjatrader.com/support/forum/forum/ninjatrader-8/indicator-development/96421-draw-dot-from-indicator-owner-problem?p=792624#post792624

When accessing series information outside of a data driven method, TriggerCustomEvent() must be called, or the Bars.GetValueAt()/.GetClose()/etc must be used.

https://ninjatrader.com/support/helpGuides/nt8/triggercustomevent.htm

https://ninjatrader.com/support/helpGuides/nt8/getvalueat.htm

https://ninjatrader.com/support/helpGuides/nt8/getclose.htm

Please include the output from your prints. (Right-click the NinjaScript Output window -> select Save As -> give the text file a name -> click Save -> attach the text file to your next post)