Get the index of the bar under the cursor

[bboyle1234]

Hi, How do I obtain the index of the bar under the mouse cursor, from within the MouseMove event? I've tried using the code below, but the results have been consistently wrong:

using System;
using NinjaTrader.Cbi;
using NinjaTrader.Gui;
using NinjaTrader.Gui.Chart;
using NinjaTrader.Gui.SuperDom;
using NinjaTrader.Gui.Tools;
using NinjaTrader.Data;
using NinjaTrader.NinjaScript;
using NinjaTrader.Core.FloatingPoint;
using NinjaTrader.NinjaScript.DrawingTools;
using System.Windows.Input;

namespace NinjaTrader.NinjaScript.Indicators
{
	public class MouseBarIndex : Indicator
	{
		protected override void OnStateChange()
		{
			switch (State) { 

				case State.SetDefaults:
					Description = @"MouseBarIndex";
					Name = "MouseBarIndex";
					IsChartOnly = true;
					Calculate = Calculate.OnBarClose;
					IsOverlay = true;
					break;
					
				case State.DataLoaded:
                    ChartControl.MouseMove += OnMouseMove;
					break;
					
				case State.Terminated:
                    ChartControl.MouseMove -= OnMouseMove;
					break;
			}
		}

        void OnMouseMove(object sender, MouseEventArgs e) {
			ChartControl.Dispatcher.Invoke(() => {
				TriggerCustomEvent((state) => {
					var x = (int)e.GetPosition(ChartControl).X;
		            var barIndex = ChartBars.GetBarIdxByX(ChartControl, x);
		            Print(string.Format("X: {0}, BarIndex: {1}", x, barIndex));
				}, 0, null);
			});
        }
	}
}

#region NinjaScript generated code. Neither change nor remove.

namespace NinjaTrader.NinjaScript.Indicators
{
	public partial class Indicator : NinjaTrader.Gui.NinjaScript.IndicatorRenderBase
	{
		private MouseBarIndex[] cacheMouseBarIndex;
		public MouseBarIndex MouseBarIndex()
		{
			return MouseBarIndex(Input);
		}

		public MouseBarIndex MouseBarIndex(ISeries<double> input)
		{
			if (cacheMouseBarIndex != null)
				for (int idx = 0; idx < cacheMouseBarIndex.Length; idx++)
					if (cacheMouseBarIndex[idx] != null &&  cacheMouseBarIndex[idx].EqualsInput(input))
						return cacheMouseBarIndex[idx];
			return CacheIndicator<MouseBarIndex>(new MouseBarIndex(), input, ref cacheMouseBarIndex);
		}
	}
}

namespace NinjaTrader.NinjaScript.MarketAnalyzerColumns
{
	public partial class MarketAnalyzerColumn : MarketAnalyzerColumnBase
	{
		public Indicators.MouseBarIndex MouseBarIndex()
		{
			return indicator.MouseBarIndex(Input);
		}

		public Indicators.MouseBarIndex MouseBarIndex(ISeries<double> input )
		{
			return indicator.MouseBarIndex(input);
		}
	}
}

namespace NinjaTrader.NinjaScript.Strategies
{
	public partial class Strategy : NinjaTrader.Gui.NinjaScript.StrategyRenderBase
	{
		public Indicators.MouseBarIndex MouseBarIndex()
		{
			return indicator.MouseBarIndex(Input);
		}

		public Indicators.MouseBarIndex MouseBarIndex(ISeries<double> input )
		{
			return indicator.MouseBarIndex(input);
		}
	}
}

#endregion

[NinjaTrader_ChelseaB]

Hello bboyle1234,

I've got a similar script that could likely be adapted very easily.

Below is a link to the forum thread where I have posted this example.

http://ninjatrader.com/support/forum/showthread.php?p=463838#post463838

This logic is added to the MouseLeftButtonDown event, you could likely change the method to OnMouseMove.

[bboyle1234]

Thanks ChelseaB,

Your suggestion helped. For the benefit of other readers, here is code I came up with:

Extension methods for MouseEventArgs:

using NinjaTrader.Gui.Chart;
using SharpDX;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;

namespace MyNamespace {
    public static class MouseEventArgsExtensions {

        public static Vector2 GetChartControlPixelsCoordinates(this MouseEventArgs e, ChartControl chartControl) {
            var position = e.GetPosition(chartControl);
            return new Vector2(ChartingExtensions.ConvertToHorizontalPixels(position.X, chartControl.PresentationSource), ChartingExtensions.ConvertToVerticalPixels(position.Y, chartControl.PresentationSource));
        }

        public static int GetBarIndex(this MouseEventArgs e, ChartControl chartControl, ChartBars chartBars) {
            return chartBars.GetBarIdxByX(chartControl, (int)e.GetChartControlPixelsCoordinates(chartControl).X);
        }

        public static void GetChartClickData(this MouseEventArgs e, ChartControl chartControl, ChartBars chartBars, ChartScale chartScale, out int barIndex, out DateTime timeLocal, out double price) {
            var position = e.GetChartControlPixelsCoordinates(chartControl);
            barIndex = chartBars.GetBarIdxByX(chartControl, (int)position.X);
            timeLocal = chartControl.GetTimeByX((int)position.X);
            price = chartScale.GetValueByY(position.Y);
        }
    }
}