SuperMap.WindowsPhone.Mapping.Map.CalculateStartViewBounds C# (CSharp) 메소드

        private void CalculateStartViewBounds(Size size)
        {
            if (!Rectangle2D.IsNullOrEmpty(cacheViewBounds) && Point2D.IsNullOrEmpty(origin))
            {
                Rectangle2D cacheBounds = cacheViewBounds;
                Point currentOffset = this.panHelper.GetCurrentOffset();
                double x = currentOffset.X;
                double y = currentOffset.Y;
                double width = size.Width;
                double height = size.Height;
                double resWidth = cacheBounds.Width / width;
                double resHeight = cacheBounds.Height / height;
                mapResolution = (resHeight > resWidth) ? resHeight : resWidth;

                double nearestLevelResolution = MathUtil.GetNearest(this.mapResolution, this.Resolutions, MinResolution, MaxResolution);
                mapResolution = nearestLevelResolution;
                targetResolution = this.mapResolution = MathUtil.MinMaxCheck(this.mapResolution, MinResolution, MaxResolution);
                //origin = new Point2D(bounds.Left + bounds.Width * 0.5 - width * 0.5 * mapResolution, bounds.Top - bounds.Height * 0.5 + height * 0.5 * mapResolution);
                origin = new Point2D(cacheBounds.Center.X - width * 0.5 * mapResolution, cacheBounds.Center.Y + height * 0.5 * mapResolution);
                //地图的中心 加 减 ViewSize大小乘以分辨率 即 初始化Origin
                cacheViewBounds = ViewBounds;//由origin和resolution重新算出来的VB赋给cacheVB，这是真正的VB
                RaiseViewBoundsChanged();
            }
        }