A Redo/Undo Mechanism on Map Editing Based on VMP and SEH
Yan Zhou · 2013
Map editing is one of the most important works of map making.Based on VMP and SEH technologies,a map document save model has been built up in this paper.Through saving the document data and the changed data in virtual memory,the map editing transactions of the document change data are organized and managed,and the document state change is efficiently detected and the document is rebuilt.Then,the unlimited undo/redo operations of map editing are accomplished.and the map editing undo/redo operation efficiency is also improved.