Dot-Marks-the-Spot-on-Equity-and-Drawdown-Curves

CODE:
using System.Windows.Forms.DataVisualization.Charting;

// Assume 'chart1' is your Chart control
private Annotation dotAnnotation;

public Form1()
{
    InitializeComponent();
    InitializeDotAnnotation();
    chart1.MouseMove += Chart1_MouseMove;
}

private void InitializeDotAnnotation()
{
    dotAnnotation = new EllipseAnnotation
    {
        AxisX = chart1.ChartAreas[0].AxisX,
        AxisY = chart1.ChartAreas[0].AxisY,
        Width = 6, // 3mm dot (adjust as needed)
        Height = 6,
        LineColor = Color.Red,
        BackColor = Color.FromArgb(128, Color.Red), // 50% opacity
        Visible = false
    };
    chart1.Annotations.Add(dotAnnotation);
}

private void Chart1_MouseMove(object sender, MouseEventArgs e)
{
    ChartArea chartArea = chart1.ChartAreas[0];
    Axis xAxis = chartArea.AxisX;
    Axis yAxis = chartArea.AxisY;

    // Convert mouse coordinates to chart values
    double xValue = xAxis.PixelPositionToValue(e.X);
    double yValue = yAxis.PixelPositionToValue(e.Y);

    // Update dot position
    dotAnnotation.X = xValue;
    dotAnnotation.Y = yValue;
    dotAnnotation.Visible = true;

    chart1.Invalidate(); // Redraw the chart
}

CODE:
using Steema.TeeChart;
using Steema.TeeChart.Tools;

private CursorTool cursorTool;
private AnnotationTool annotationTool;

public Form1()
{
    InitializeComponent();
    InitializeChartTools();
    tChart1.MouseMove += TChart1_MouseMove;
}

private void InitializeChartTools()
{
    cursorTool = new CursorTool(tChart1.Chart)
    {
        FollowMouse = true,
        Style = CursorToolStyles.Vertical
    };
    tChart1.Tools.Add(cursorTool);

    annotationTool = new AnnotationTool(tChart1.Chart)
    {
        Shape = { CustomPosition = true },
        TextAlign = StringAlignment.Center
    };
    tChart1.Tools.Add(annotationTool);
}

private void TChart1_MouseMove(object sender, MouseEventArgs e)
{
    if (tChart1.Series.Count == 0) return;

    double xValue = tChart1.Axes.Bottom.CalcPosPoint(e.X);
    double yValue = tChart1.Axes.Left.CalcPosPoint(e.Y);

    // Update annotation text and position
    annotationTool.Text = $"X: {xValue:F2}\nY: {yValue:F2}";
    annotationTool.Left = e.X + 10;
    annotationTool.Top = e.Y + 10;

    // Ensure annotation stays within chart bounds
    if (annotationTool.Left + annotationTool.Width > tChart1.Width)
        annotationTool.Left = e.X - annotationTool.Width - 10;
    if (annotationTool.Top + annotationTool.Height > tChart1.Height)
        annotationTool.Top = e.Y - annotationTool.Height - 10;

    // Show annotation only when mouse is over chart area
    annotationTool.Active = tChart1.ChartRect.Contains(e.Location);

    tChart1.Invalidate();
}

CODE:
using Steema.TeeChart;
using Steema.TeeChart.Tools;

private AnnotationTool dotTool;

public Form1()
{
    InitializeComponent();
    InitializeChartTools();
    tChart1.MouseMove += TChart1_MouseMove;
}

private void InitializeChartTools()
{
    dotTool = new AnnotationTool(tChart1.Chart)
    {
        Shape = { CustomPosition = true },
        TextAlign = StringAlignment.Center,
        Shape = { ShapeStyle = Drawing.ShapeStyles.Circle },
        Shape = { Color = Color.FromArgb(128, Color.Red) }, // Semi-transparent red
        Shape = { Size = new Size(6, 6) } // 3mm dot (adjust as needed)
    };
    tChart1.Tools.Add(dotTool);
}

private void TChart1_MouseMove(object sender, MouseEventArgs e)
{
    if (tChart1.Series.Count == 0) return;

    double xValue = tChart1.Axes.Bottom.CalcPosPoint(e.X);
    double yValue = tChart1.Axes.Left.CalcPosPoint(e.Y);

    // Update dot position
    dotTool.Left = e.X - dotTool.Shape.Size.Width / 2;
    dotTool.Top = e.Y - dotTool.Shape.Size.Height / 2;

    // Show dot only when mouse is over chart area
    dotTool.Active = tChart1.ChartRect.Contains(e.Location);

    tChart1.Invalidate();
}

CODE:
      private void Chart_MouseMove(object sender, MouseEventArgs e)
      {
         // Check if the mouse position is within the chart's boundaries
         if (chart.ClientRectangle.Contains(e.Location))
         {
            // Get the X position in the chart based on mouse position
            mouseXValue = chart.Axes.Bottom.Invert ?
               chart.Axes.Bottom.Maximum - chart.Axes.Bottom.CalcXPosValue(e.X) : chart.Axes.Bottom.CalcXPosValue(e.X);
            
            // Refresh the chart to draw the dot at the new price level
            chart.Refresh();
         }
      }

CODE:
      private void Chart_AfterDraw(object sender, EventArgs e)
      {
         // Create a Graphics object to draw on the chart
         using (Graphics g = chart.Graphics)
         {
            // Set the size of the dot
            int dotSize = 6;
            
            // Get mouseXValue
            int xCoord = chart.Axes.Bottom.CalcXPosValue(mouseXValue);
            
            // Get the price level corresponding to the mouse's X position
            float correspondingPrice = chart.Axes.Left.Maximum -
               (chart.Axes.Left.Maximum - chart.Axes.Left.Minimum) * mouseXValue /
               (chart.Axes.Bottom.Maximum - chart.Axes.Bottom.Minimum);
            
            // Calculate the Y position for the corresponding price level
            int yCoord = chart.Axes.Left.CalcYPosValue(correspondingPrice);
            
            // Create a semi-transparent red brush for the dot
            Color semiTransparentRed = Color.FromArgb(128, Color.Red);
            using (Brush brush = new SolidBrush(semiTransparentRed))
            {
               // Draw a filled ellipse (dot) on the chart at the calculated coordinates
               g.FillEllipse(brush, xCoord - dotSize / 2, yCoord - dotSize / 2,
               dotSize, dotSize);
            }
         }
      }

CODE:
      ...
      ...
      // Subscribe to the MouseMove event
      chart.MouseMove += Chart_MouseMove;

      // Subscribe to the AfterDraw event
      chart.AfterDraw += Chart_AfterDraw;