WPF-22：WPF绘制五角星改进版（增加半个五角星的绘制）-修改bug

之前用坐标画多边形的方法，绘制五角星。今天调试时发现当时写的时候有bug，修改一下。
原文：
http://blog.csdn.net/yysyangyangyangshan/article/details/9313421，当时没测试绑定的问题，一测试发现绑定有问题。原来是多颗五角星控件中，依赖属性的typeof写错了类。

SelectCount和ItemsCount的typeof(FivePointStar)应该为typeof(FivePointStarGroup)才对，顺便将属性的赋值里的代码改为在回调里调用。

修改后如下：

    /// <summary>
    /// FivePointStarGroup.xaml 的交互逻辑
    /// </summary>
    public partial class FivePointStarGroup : UserControl
    {
        //默认值
        private static double radius = 20;

        private static double itemsCount = 5;

        private static double selectCount = 5;

        private static Brush selectBackground = new SolidColorBrush(Colors.YellowGreen);

        private static Brush unselectBackgroud = new SolidColorBrush(Colors.DarkGray);

        private static event DependencyPropertyChangedEventHandler PropertyChangedEvent;

        private static ObservableCollection<FivePointStarModel> data = new ObservableCollection<FivePointStarModel>();

        public FivePointStarGroup()
        {
            InitializeComponent();

            this.Loaded += new RoutedEventHandler(FivePointStarGroup_Loaded);

            PropertyChangedEvent -= new DependencyPropertyChangedEventHandler(FivePointStarGroup_PropertyChangedEvent);

            PropertyChangedEvent += new DependencyPropertyChangedEventHandler(FivePointStarGroup_PropertyChangedEvent);

            this.lsbGroups.ItemsSource = data;
        }

          /// <summary>
        /// 五角星半径
        /// </summary>
        public double Radius
        {
            get
            {
               object result = GetValue(RadiusProperty);

                if(result==null)
                {
                    return radius;
                }

                return (double)result;
            }

            set { SetValue(RadiusProperty, value);}
        }

        public static  DependencyProperty RadiusProperty =
           DependencyProperty.Register("Radius", typeof(double),
           typeof(FivePointStarGroup), new UIPropertyMetadata(), new ValidateValueCallback(PaintRadiusElementControls));

        public static bool PaintRadiusElementControls(object value)
        {
            if (PropertyChangedEvent != null)
            {
                PropertyChangedEvent(1, new DependencyPropertyChangedEventArgs(SelectCountProperty, null, value));
            }

            return true;
        }

        /// <summary>
        /// 五角星个数
        /// </summary>
        public double ItemsCount
        {
            get
            {
                object result = GetValue(ItemsCountProperty);

                if (result == null || Convert.ToDouble(result )<=0)
                {
                    return  itemsCount;
                }

                return (double)result;
            }

            set { SetValue(ItemsCountProperty, value); }
        }

        public static  DependencyProperty ItemsCountProperty =
           DependencyProperty.Register("ItemsCount", typeof(double),
           typeof(FivePointStarGroup), new UIPropertyMetadata(), new ValidateValueCallback(PaintItemCountElementControls));

        public static bool PaintItemCountElementControls(object value)
        {
            if (PropertyChangedEvent != null)
            {
                PropertyChangedEvent(2, new DependencyPropertyChangedEventArgs(SelectCountProperty, null, value));
            }

            return true;
        }

        /// <summary>
        /// 选中的五角星个数
        /// </summary>
        public double SelectCount
        {
            get
            {
                object result = GetValue(SelectCountProperty);

                if (result == null || Convert.ToDouble(result) <= 0)
                {
                    return selectCount;
                }

                return (double)result;
            }

            set { SetValue(SelectCountProperty, value);}
        }

        public static  DependencyProperty SelectCountProperty =
           DependencyProperty.Register("SelectCount", typeof(double),
           typeof(FivePointStarGroup), new UIPropertyMetadata(), new ValidateValueCallback(PaintSelectCountElementControls));

        public static bool PaintSelectCountElementControls(object value)
        {
            if (PropertyChangedEvent != null)
            {
                PropertyChangedEvent(3, new DependencyPropertyChangedEventArgs(SelectCountProperty, null, value));
            }

            return true;
        }
        /// <summary>
        /// 鼠标点击选中事件
        /// </summary>
        public event RoutedEventHandler SelectCountChangeEvent
        {
            add { AddHandler(SelectCountChangePropertyEvent, value); }

            remove { RemoveHandler(SelectCountChangePropertyEvent, value); }
        }

        public static RoutedEvent SelectCountChangePropertyEvent =
          EventManager.RegisterRoutedEvent("SelectCountChangeEvent",
          RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(Control));

        /// <summary>
        /// 选中颜色
        /// </summary>
        public Brush SelectBackground
        {
            get
            {
                object result = GetValue(SelectBackgroundProperty);

                if (result == null)
                {
                    return selectBackground;
                }

                return (Brush)result;
            }

            set {  SetValue(SelectBackgroundProperty, value);  }
        }

        public static  DependencyProperty SelectBackgroundProperty =
           DependencyProperty.Register("SelectBackground", typeof(Brush),
           typeof(FivePointStarGroup), new UIPropertyMetadata(), new ValidateValueCallback(PaintSelectGroundElementControls));

        public static bool PaintSelectGroundElementControls(object value)
        {
            if (PropertyChangedEvent != null)
            {
                PropertyChangedEvent(4, new DependencyPropertyChangedEventArgs(SelectCountProperty, null, value));
            }

            return true;
        }

        /// <summary>
        /// 未选中颜色
        /// </summary>
        public Brush UnSelectBackground
        {
            get
            {
                object result = GetValue(UnSelectBackgroundProperty);

                if (result == null)
                {
                    return unselectBackgroud;
                }

                return (Brush)result;
            }

            set  {SetValue(UnSelectBackgroundProperty, value); }
        }

        public static  DependencyProperty UnSelectBackgroundProperty =
           DependencyProperty.Register("UnSelectBackground", typeof(Brush),
           typeof(FivePointStarGroup), new UIPropertyMetadata(), new ValidateValueCallback(PaintUnSelectGroundElementControls));

        public static bool PaintUnSelectGroundElementControls(object value)
        {
            if (PropertyChangedEvent != null)
            {
                PropertyChangedEvent(5, new DependencyPropertyChangedEventArgs(SelectCountProperty, null, value));
            }

            return true;
        }

        /// <summary>
        /// 回调时绘图事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void FivePointStarGroup_PropertyChangedEvent(object sender, DependencyPropertyChangedEventArgs e)
        {
            if (sender == null || e == null || e.NewValue == null)
            {
                return;
            }

            int flag = Convert.ToInt32(sender);

            switch (flag)
            {
                case 1:

                    InitialData(Convert.ToDouble(e.NewValue), this.ItemsCount, this.SelectCount, this.SelectBackground, this.UnSelectBackground);

                    break;

                case 2:

                    InitialData(this.Radius, Convert.ToDouble(e.NewValue), this.SelectCount, this.SelectBackground, this.UnSelectBackground);

                    break;

                case 3:

                    InitialData(this.Radius, this.ItemsCount, Convert.ToDouble(e.NewValue), this.SelectBackground, this.UnSelectBackground);

                    break;

                case 4:

                    InitialData(this.Radius, this.ItemsCount, this.SelectCount, e.NewValue as Brush, this.UnSelectBackground);

                    break;

                case 5:

                    InitialData(this.Radius, this.ItemsCount, this.SelectCount, this.SelectBackground, e.NewValue as Brush);

                    break;
            }

            InvalidateVisual();
        }

        void FivePointStarGroup_Loaded(object sender, RoutedEventArgs e)
        {
            InitialData(this.Radius,this.ItemsCount,this.SelectCount,this.SelectBackground,this.UnSelectBackground);
        }
        /// <summary>
        /// 绘图
        /// </summary>
        /// <param name="r"></param>
        /// <param name="itemcount"></param>
        /// <param name="selectcount"></param>
        /// <param name="selectbackground"></param>
        /// <param name="unselectbackground"></param>
        private static  void InitialData( double r,double itemcount,double selectcount,Brush selectbackground,Brush unselectbackground)
        {
            data.Clear();

            int count = Convert.ToInt32(itemcount);

            if (count <= 0)
            {
                count = Convert.ToInt32(itemsCount);
            }

            for (int i = 0; i < count; i++)
            {
                FivePointStarModel item = new FivePointStarModel();

                item.ID = i + 1;

                item.Radius = r;

                item.SelectBackground = selectbackground;

                item.UnselectBackgroud = unselectbackground;

                item.Margins = new Thickness(r, 0, r, 0);

                //在此设置星形显示的颜色
                if ((i + 1) > selectcount && ((i + 1 - selectcount) > 0) &&
                    (i + 1 - selectcount) < 1)
                {
                    item.CurrentValue = 0.5;
                }
                else if ((i + 1) > selectcount)
                {
                    item.CurrentValue = 0;
                }
                else
                {
                    item.CurrentValue = 1;
                }

                data.Add(item);
            }
        }

        /// <summary>
        /// 鼠标选中五角星
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void FivePointStar_MouseDown(object sender, MouseButtonEventArgs e)
        {
            FivePointStar m = sender as FivePointStar;

            if (m == null)
            {
                return;
            }

            int index = Convert.ToInt32(m.Tag);

            this.SelectCount = index;

            RaiseEvent(new RoutedEventArgs(SelectCountChangePropertyEvent, sender));
        }
    }

修改后工程下载（包括了绑定测试）： http://download.csdn.net/detail/yysyangyangyangshan/5782113