SuperMap.WindowsPhone.Mapping.Map.Layers_LayersInitialized C# (CSharp) Method

        private void Layers_LayersInitialized(object sender, EventArgs args)
        {
            if (this.panHelper != null)
            {
                hasChanged = true;

                if (Point2D.IsNullOrEmpty(origin))
                {
                    Rectangle2D bounds = this.Bounds;
                    if (Rectangle2D.IsNullOrEmpty(bounds))
                    {
                        return;//只有一个图层的时候，要求必需有bounds
                    }
                    if (!Rectangle2D.IsNullOrEmpty(ViewBounds))
                    {
                        bounds = ViewBounds;
                    }
                    cacheViewBounds = bounds;//赋给cacheVB
                    if ((currentSize.Width == 0.0) || (currentSize.Height == 0.0))
                    {
                        base.Dispatcher.BeginInvoke(delegate { this.Layers_LayersInitialized(sender, args); });
                        return;
                    }
                }

                //比如用TiledDynamicLayer 也没设置scalse，却只设置了MaxScale和MinScale,那么也设下最大最小吧
                if (isMaxScaleSet && !isMinResolutionSet)
                {
                    this.MinResolution = ScaleHelper.ScaleConversion(this.MaxScale, this.Dpi, this.CRS);
                }

                if (isMinScaleSet && !isMaxResolutionSet)
                {
                    this.MaxResolution = ScaleHelper.ScaleConversion(this.MinScale, this.Dpi, this.CRS);
                }


                //放到scales的Set里? 在那里时，dpi基本为0，所以这里还得设置
                if (this.Scales != null)//不是后设的时候,优先级高
                {
                    fromLayers = false;//用了scales说明肯定不是从layer获取
                    if (this.Dpi != 0.0)    //TieldWMS用SuperMap时无法知道dpi，所以即便设置了scales也没用
                    {
                        this.Resolutions = ScaleHelper.ConversionBetweenScalesAndResulotions(this.Scales, this.Dpi, this.CRS);

                        if (isMaxScaleSet)
                        {
                            this.MinResolution = ScaleHelper.ScaleConversion(this.MaxScale, this.Dpi, this.CRS); ;
                        }

                        if (isMinScaleSet)
                        {
                            this.MaxResolution = ScaleHelper.ScaleConversion(this.MinScale, this.Dpi, this.CRS); ;
                        }
                    }
                }

                if (this.Resolutions != null)
                {
                    if (!this.isMinResolutionSet)
                    {
                        this.MinResolution = this.Resolutions[this.Resolutions.Length - 1];
                    }
                    if (!this.isMaxResolutionSet)
                    {
                        this.MaxResolution = this.Resolutions[0];
                    }
                }

                this.CalculateStartViewBounds(currentSize);

                foreach (Layer layer in this.Layers)
                {
                    this.AssignLayerContainer(layer);
                }

                if ((this.Resolutions != null) && (((this.Resolution < this.MinResolution) || (this.Resolution > this.MaxResolution))))
                {
                    double res = MathUtil.GetNearest(this.mapResolution, this.Resolutions, MinResolution, MaxResolution);
                    if (res != this.mapResolution)
                    {
                        this.ZoomToResolution(res);
                    }
                }
                else
                {
                    this.LoadLayersInView(false, this.GetFullViewBounds());
                }
                oldScales = this.Scales;
                oldResolutions = this.Resolutions;
            }

        }
        //旋转时，panning时，用到该函数，并不需要重新全部载入图片，有的tile可重用