Based on the Delphi' s TSimpleGraph control similar to Google map zoom in and out need a picture for the system to operate with very useful

放大缩小\Project1.dpr
........\Project1.res
........\Road.bmp
........\Project1.dof
........\Project1.cfg
........\Unit1.dcu
........\Project1.exe
........\Unit1.~pas
........\Unit1.~dfm
........\Unit1.~ddp
........\Unit1.pas
........\Unit1.dfm
........\Unit1.ddp
放大缩小

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