Specify the coordinates of the timeline at the introduction

[Pearlaqua]

There's a schedule for a function like chart. We need to write a code to make a mouse at the point of schedule, show the location.

Implementation of the timetable:

int x = 0; 
for (double i = -Period; i <= Period; i += step) { 
    chart.Visible = true;
    chart.Series[0].ChartType = SeriesChartType.Spline; 
    mas_MyGraphic5[x] = FuncForGraphic5(i); 
    chart5.Series[0].Points.AddXY(i, FuncForGraphic5(i)); 
    x++;
} 

[emmalee]

I suggest that the following value should be established. Series.ToolTip:

chart.Series[0].ToolTip = "X = #VALX, Y = #VALY";

In this case, no additional code will have to be written.

---

We can still sign for the event. https://msdn.microsoft.com/en-us/library/system.windows.forms.datavisualization.charting.chart.gettooltiptext.aspx and using a class-transmitted copy to the processor https://msdn.microsoft.com/en-us/library/system.windows.forms.datavisualization.charting.tooltipeventargs.aspx I'm gonna figure out what to do with ToolTip.

chart.GetToolTipText += chart_GetToolTipText;

Processor:

private void chart_GetToolTipText(object sender, ToolTipEventArgs e)
{
    // Если текст в подсказке уже есть, то ничего не меняем.
    if (!String.IsNullOrWhiteSpace(e.Text))
        return;
Console.WriteLine(e.HitTestResult.ChartElementType);

switch (e.HitTestResult.ChartElementType)
{
    case ChartElementType.DataPoint:
    case ChartElementType.DataPointLabel:
    case ChartElementType.Gridlines:
    case ChartElementType.Axis:
    case ChartElementType.TickMarks:
    case ChartElementType.PlottingArea:
        // Первый ChartArea
        var area = chart.ChartAreas[0];

        // Его относительные координаты (в процентах от размеров Chart)
        var areaPosition = area.Position;

        // Переводим в абсолютные
        var areaRect = new RectangleF(areaPosition.X * chart.Width / 100, areaPosition.Y * chart.Height / 100,
            areaPosition.Width * chart.Width / 100, areaPosition.Height * chart.Height / 100);

        // Область построения (в процентах от размеров area)
        var innerPlot = area.InnerPlotPosition;

        double x = area.AxisX.Minimum +
                    (area.AxisX.Maximum - area.AxisX.Minimum) * (e.X - areaRect.Left - innerPlot.X * areaRect.Width / 100) /
                    (innerPlot.Width * areaRect.Width / 100);
        double y = area.AxisY.Maximum -
                    (area.AxisY.Maximum - area.AxisY.Minimum) * (e.Y - areaRect.Top - innerPlot.Y * areaRect.Height / 100) /
                    (innerPlot.Height * areaRect.Height / 100);

        Console.WriteLine("{0:F2} {1:F2}", x, y);
        e.Text = String.Format("{0:F2} {1:F2}", x, y);
        break;
}

}

Despite the fact that the coordinates are computed correctly and sent to e.TextI don't always have ToolTip. That's why I'm printing them to the console for loyalty. Instead, you can display them in some control.