优化图片刷新

XHWK.WKTool/XHMicroLessonSystemWindow.xaml.cs

                             imgCanvas.Width = bitImg.Width;
                             imgCanvas.Height = bitImg.Height;
                             scroMain.ScrollToVerticalOffset(0);
-                            APP.PageDrawList[APP.pageData.currpage - 1].ImageSizes = new ScaleTransform
+                                imgCanvas.Margin = new Thickness(APP.PageDrawList[APP.pageData.currpage - 1].ImageLocation.X, APP.PageDrawList[APP.pageData.currpage - 1].ImageLocation.Y, 0, 0);
+                                APP.PageDrawList[APP.pageData.currpage - 1].ImageSizes = new ScaleTransform
                             {
                                 CenterX = imgCanvas.Width,
                                 CenterY = imgCanvas.Height