优化

Common/system/BlackboardNew.cs

                         m_canvas.Strokes.Clear();
                     }
 
-                    m_canvas.Strokes.Add(page.lines.Last().lines_curr);
+                   
 
 
                     StrokeCollection strokes = new StrokeCollection();
                     stylusPoint.Y = 213;
                     stylusPoints.Add(stylusPoint);
                     stroke = new Stroke(stylusPoints);
-
+                    page.lines.Last().lines_curr.Add(stroke);
+                    m_canvas.Strokes.Add(page.lines.Last().lines_curr);
                     //stylusPoint.X = 586;
                     //stylusPoint.Y = 214;
                     //stylusPoints.Add(stylusPoint);
                     //drawingAttributes.FitToCurve = true;
                     //drawingAttributes.IgnorePressure = false;
                     //stroke.DrawingAttributes = drawingAttributes;
-                    m_canvas.Strokes.Add(stroke);
+                    //m_canvas.Strokes.Add(stroke);
                 }
             }
         }