public static BezierCurve FromEllipse(Point center, Size radius)
{
var pt1 = new Point(0, radius.Height); // top
var pt2 = new Point(radius.Width, 0); // right
var pt3 = new Point(0, -radius.Height); // bottom
var pt4 = new Point(-radius.Width, 0); // left
double dx = radius.Width * 4.0 * (System.Math.Sqrt(2) - 1) / 3;
double dy = radius.Height * 4.0 * (System.Math.Sqrt(2) - 1) / 3;
var curve_control_points = new []
{
pt1,
pt1.Add(dx, 0),
pt2.Add(0, dy),
pt2,
pt2.Add(0, -dy),
pt3.Add(dx, 0),
pt3,
pt3.Add(-dx, 0),
pt4.Add(0, -dy),
pt4,
pt4.Add(0, dy),
pt1.Add(-dx, 0),
pt1
}
.Select(p => p + center).ToArray();
var curve_Degree = 3;
var curve = new BezierCurve(curve_control_points, curve_Degree);
return curve;
}
public IVisio.Shape DrawOval(Point center, double radius)
{
var A = center.Add(-radius, -radius);
var B = center.Add(radius, radius);
var rect = new Rectangle(A, B);
return this.DrawOval(rect);
}
