The Design And Realization Of Embedded Gis Graphics Mid-ware Research On

The embedded equipments exist everywhere in the daily life,mobile phone,MP3,digital camera,washing machine,color television,refrigerator,telephone,the game machine and so on, may all have embedded software on the inside.Along with embedded system expands at higher layer apply,we have to face a great deal of problem of handing over with each other between system and users.And alternation according to the graphics is most effectively with each other and is also most approved by the customer.For this most embedded operate systems built up own graphics system,and released own graphics equipments interface.In the meantime of good satisfying this system graphics request,these graphics systems also brought inconvenience for the development of the applied software.Because not existing the graphics equipments unify interface norm,the graphics equipments of each system interface are greatly not same,this makes the applied software between the different operate systems being extremely inconvenient at transplantation.And the technique of the CG-GDI also put forward under this background.The CG-GDI is an general graphics concrete layer according to the thought of the Mid-Ware just for embedded GIS design.Its subject is that to sample common ground of hardware and operate system in each embedded system graphics,shields their difference, provides the simple and unify graphics function interface for the head layer GIS application procedure,reducing the development difficulty and the workload for personnel in developing different embedded GIS system.So the GIS system developed based on the CG-GDI,if uses pure C/C++ code,can attain"a set of code,circulate everywhere",this is the purpose that develops the CG-GDI.This article mainly discusses how to design and realize the CG-GDI We design the class structure of the Embedded GIS Graphics Mid-Ware,and realize it in VxWorks,embedded Linux, and WinCE operation system.Then we based on Embedded GIS Graphics Mid-Ware design a suit of GIS module,and experiment it in VxWorks,embedded Linux,and WinCE operation system.