Silverlight 2.5D RPG游戏技巧与特效处理：（二）纸娃娃系统

    /// <summary>
    /// 装备部件基类
    /// </summary>
    public abstract class EquipBase : ObjectBase {

        /// <summary>
        /// 加载完毕
        /// </summary>
        public event EventHandler Ready;

        /// <summary>
        /// 获取或设置部件名
        /// </summary>
        protected string partName { get; set; }

        long index = 0; // 异步加载与换装同步协调
        public override int Code {
            get { return base.Code; }
            set {
                index++;
                if (value == -1) { base.Code = value; return; }
                string key = string.Format("{0}{1}", partName, value);
                if (Res.ContainsKey(key)) {
                    base.Code = value;
                    loadConfig(key);
                } else {
                    Downloader downloader = new Downloader();
                    downloader.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
                    downloader.OpenReadAsync(string.Format("{0}{1}.xap", partName, value), string.Format("{0},{1}", index, value), 2000);
                }
            }
        }

        void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e) {
            Downloader downloader = sender as Downloader;
            downloader.OpenReadCompleted -= webClient_OpenReadCompleted;
            string[] str = e.UserState.ToString().Split(',');
            if (Convert.ToInt64(str[0]) == index) {
                int code = Convert.ToInt32(str[1]);
                string key = string.Format("{0}{1}", partName, str[1]);
                if (!Res.ContainsKey(key)) { Res.Add(key, new StreamResourceInfo(e.Result as Stream, "application/binary")); }
                base.Code = code;
                loadConfig(key);
            }
        }

        Dictionary<string, Point> frameOffset = new Dictionary& lt;string, Point>(); //各帧偏移
        /// <summary>
        /// 加载配置
        /// </summary>
        void loadConfig(string key) {
            XElement info = XElement.Load(Application.GetResourceStream(Res[key], new Uri("Info.xml", UriKind.Relative)).Stream).DescendantsAndSelf(partName).Single();
            FullName = info.Attribute("FullName").Value;
            // 解析各帧偏移
            IEnumerable<XElement> iFrame = info.Element("Frames").Elements();
            frameOffset.Clear();
            foreach (XElement element in iFrame) {
                frameOffset.Add(element.Attribute("ID").Value, new Point() {
                    X = (double)element.Attribute("OffsetX"),
                    Y = (double)element.Attribute("OffsetY"),
                });
            }
            if (Ready != null) { Ready(this, null); }
        }

        bool _IsTurn;
        /// <summary>
        /// 获取或设置是否水平翻转
        /// </summary>
        public bool IsTurn {
            get { return _IsTurn; }
            set {
                if (_IsTurn != value) {
                    Transform = (_IsTurn = value) ? scaleTransform : null;
                }
            }
        }

        bool _Flash;
        /// <summary>
        /// 获取或设置是否闪光
        /// </summary>
        public bool Flash {
            get { return _Flash; }
            set {
                if (_Flash != value) {
                    //if (_Flash = value) {
                    //    dispatcherTimer.Start();
                    //} else {
                    //    this.Opacity = 1;
                    //    dispatcherTimer.Stop();
                    //}
                    this.Opacity = (_Flash = value) ? 0.4 : 1;
                }
            }
        }

        bool order = false;
        DispatcherTimer dispatcherTimer = new DispatcherTimer() { Interval = TimeSpan.FromMilliseconds(100) }; // 换装时的闪光特效计时器
        public EquipBase() {
            dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick);
        }

        void dispatcherTimer_Tick(object sender, EventArgs e) {
            if (order) {
                this.Opacity = this.Opacity + 0.1;
                if (this.Opacity >= 1) { order = false; }
            } else {
                this.Opacity = this.Opacity - 0.1;
                if (this.Opacity <= 0.3) { order = true; }
            }
        }

        static Dictionary<string, Stream> equipRes = new Dictionary<string, Stream>();

        ScaleTransform scaleTransform = new ScaleTransform() { ScaleX = -1 };
        /// <summary>
        /// 呈现帧图
        /// </summary>
        public void Display(string key) {
            string resKey = string.Format("{0}{1}{2}", partName, Code, key);
            if (!equipRes.ContainsKey(resKey)) {
                equipRes.Add(resKey, Application.GetResourceStream(Res[string.Format("{0}{1}", partName, Code)], new Uri(string.Format("{0}.png", key), UriKind.Relative)).Stream);
            }
            this.StreamSource = equipRes[resKey];
            this.InternalOffset = frameOffset[key];
            if (IsTurn) { scaleTransform.CenterX = Center.X - frameOffset[key].X; }
        }

        public override void Dispose(object sender, EventArgs e) {
            dispatcherTimer.Stop();
            dispatcherTimer.Tick -= dispatcherTimer_Tick;
            base.Dispose(sender, e);
        }
    }