Master

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s Thesis 2006 

FACHHOCHSCHULE

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STUTTGART

TECHNIK

The implementation 

        STUTTGART UNIVERSITY OF APPLIED 

SCIENCES 

But,  only  reduce  the  displaying  size  of  SVG  map  is  not  enough.  The  client  should 

select only the displaying area where the users want to view, not necessary to load the 

whole map file. 

View 

Space 

Fig. 16: 

Display area selection 

Supposed that the  user  has  input  the  coordinate  of  one  point:  pX  and  pY,  the  client 

should calculate the selected area around this point according to the map scale, using 

the same  formulary (List. 8) to decide the view box location  in the  full area of  map. 

After  those  transformation  and  calculation,  the  size  of  map  i.e.  width  and  height  of 

SVG  document  were  fixed  as  240  and  320  (pixels)  respectively,  and  the  width  and 

height of viewBox were also set as 24000m x 32000m with map scale 1: 400000. See 

Figure 17. 

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