Arrows/AdjustableArrowBezierCurve.cs

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namespace YiYan127.WPF.Arrows
{
    using System.Windows;
    using System.Windows.Input;
    using System.Windows.Media;

    /// <summary>
    /// 可调整的贝塞尔曲线
    /// </summary>
    public class AdjustableArrowBezierCurve : ArrowBezierCurve
    {
        #region Fields

        /// <summary>
        /// 是否显示控制的依赖属性
        /// </summary>
        public static readonly DependencyProperty ShowControlProperty = DependencyProperty.Register(
            "ShowControl",
            typeof(bool),
            typeof(AdjustableArrowBezierCurve),
            new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.AffectsRender));

        /// <summary>
        /// 控制点椭圆半径
        /// </summary>
        private const double EllipseRadius = 5;

        /// <summary>
        /// 连线画笔
        /// </summary>
        private readonly Pen linePen = new Pen(Brushes.Black, 1);

        /// <summary>
        /// 控制点画刷
        /// </summary>
        private readonly Brush ellipseBrush = Brushes.Black;

        /// <summary>
        /// 控制点椭圆画笔
        /// </summary>
        private readonly Pen ellipsePen = new Pen(Brushes.Black, 1);

        /// <summary>
        /// 是否按下控制点1
        /// </summary>
        private bool isPressedControlPoint1;

        /// <summary>
        /// 是否按下控制点2
        /// </summary>
        private bool isPressedControlPoint2;

        #endregion Fields

        #region Properties

        /// <summary>
        /// 是否显示控制
        /// </summary>
        public bool ShowControl