[crossfire] Re: Map Protocol Question

[alex_sch at telus.net]

Quoting Andreas Kirschbaum <
     
     kirschbaum at myrealbox.com
     
     >:

>
     
      Maybe I did use the wrong words here, but the client does not just
     
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      ignore the map_scroll command: I tried to say that the client currently
     
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      has an empty map. Now he receives the map_scroll command and properly
     
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      scrolls the map view. But since an empty map scrolled by one tile is
     
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      still an empty map I said it "basically ignores" the map_scroll command.
     
     Ok, I see what you mean now.

>
     
      (with S=Scorn, G=gatehouse, E=empty)
     
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      Therefore the client updates his map view as follows:
     
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      1. newmap: client clears his map view; it is now E.
     
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      2. diff S->G: client "patches" his map view (currently E) with a
     
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         difference S->G. This is not correct because that difference should
     
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         be applied to the map view S, but not to E.
     
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      3. diff E->G: client "patches" his map view (currently "E patched by
     
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         S->G", which is often "G with a few blank holes in it"). Again, this
     
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         is not correct because this difference should be applied to the map
     
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         view E but not to "G with holes".
     
     Ok, I see, and the problem is when the the map_scroll happens after the S->G
diff, and the diff E->G happens after the map_scroll. Now I think I understand.

   Alex Schultz