Steema Central

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protected override void OnMouseMove(MouseEventArgs e)
{
	base.OnMouseMove(e);

	m_mouseXPos = e.X;
	m_mouseYPos = e.Y;
}

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int XIndex = series.Clicked(m_mouseXPos, m_mouseYPos);

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We are inside the MarksTip_GetText(...) event
(...)

// Get the index of the nearest X value in the series that triggered the tooltip
int nearestPointIndex = series.Clicked(m_mouseXPos, m_mouseYPos);
					
if (series is Line && nearestPointIndex >= 0)
{
	// Try to resolve more accurate nearest point value for Line series
	Line line = (Line)series;

	if (line.XValues.Count > 1 && (nearestPointIndex + 1) < line.XValues.Count)
	{
		// The nearest point as resolved by "series.Clicked(...)"
		// is ALWAYS the point to the left of the mouse even if very close to the point to the right.
		// Here we are measuring the distance in pixels between the mouse and the two potential neareast
		// points and adjusting the "real" nearest point if need be.

		double leftPointScreenValue = line.CalcXPos(nearestPointIndex);			// Point to the left of the mouse
		double rightPointScreenValue = line.CalcXPos(nearestPointIndex + 1);	// Point to the right of the mouse

		if (Math.Abs(m_mouseXPos - rightPointScreenValue) < Math.Abs(m_mouseXPos - leftPointScreenValue))
		{
			nearestPointIndex = nearestPointIndex + 1;
		}
	}
}