SHJX_GM/SHJX.Service.WorkFlowEdit/Controls/Ports/EllipsePort.cs

using System.Windows;

namespace SHJX.Service.WorkFlowEdit
{
    public class EllipsePort: PortBase
	{
		static EllipsePort()
		{
			FrameworkElement.DefaultStyleKeyProperty.OverrideMetadata(
				typeof(EllipsePort), new FrameworkPropertyMetadata(typeof(EllipsePort)));
		}

		public override Point GetEdgePoint(Point target)
		{
			var a = ActualWidth / 2;
			var b = ActualHeight / 2;
			var p = new Point(target.X - Center.X, target.Y - Center.Y);
			p = GeometryHelper.EllipseLineIntersection(a, b, p);
			return new Point(p.X + Center.X, p.Y + Center.Y);
		}

		public override bool IsNear(Point point)
		{
			var a = ActualWidth / 2 + Sensitivity;
			var b = ActualHeight / 2 + Sensitivity;
			return GeometryHelper.EllipseContains(Center, a, b, point);
		}
	}
}