/// <summary>
/// Draws a quadratic Bezier curve from the current point to (x,y) using (xControl,yControl) as the control point.
/// </summary>
/// <param name="x1"></param>
/// <param name="y1"></param>
/// <param name="x2"></param>
/// <param name="y2"></param>
public void Curve3(double x1, double y1, double x2, double y2)
{
_latestSVGPathCmd = SvgPathCommand.QuadraticBezierCurve;
_myvxs.AddC3To(
_c1.x = x1, _c1.y = y1,
_latest_x = x2, _latest_y = y2);
}