seems to be a versatilbe body part you have there :-) Thanks for the input.
Stephan On 13 Jan., 18:10, TreKing <treking...@gmail.com> wrote: > On Thu, Jan 13, 2011 at 10:38 AM, Stephan Wiesner < > > testexpe...@googlemail.com> wrote: > > Thanks for your reply. I have thought about that, but can't find a good > > solution for that either. Sure, nobody needs them all at zoomed out level. > > But the user needs to see that there are at least some at a location (like I > > said, whole country). So I would have to, don't know, show only one in ten > > or something like that. They are clustered in the mountains and far between > > in other areas. Meaning I would have to calculate, what? The distance > > between all points? How would I decide which to display and which not to > > display? > > As MrChaz alluded to, you'll want to cluster your points at zoomed out > levels. > > One dumb implementation could, for each zoom level, define a "Cluster" which > is a collection of markers. You'll have a set of Clusters and a pivot point > in each cluster to compare to. > > For each of your markers, iterate over you set of clusters. For each cluster > compare the market against the pivot . If it's close enough (in screen > terms) you add it to that pivot's cluster, otherwise it starts it's own > cluster and becomes the pivot of that cluster. > > Once you're done you'll have a set of clusters for each zoom level and > that's all you'll have to display, either based on the pivot or the average > location of all markers in the cluster. You can cache this data structure so > you don't have to rebuild it each time and perhaps only load the cluster set > for a given zoom level when the user zooms to that level. > > I just pulled that out of my ass so no idea how practical it actually is, > but should give you some idea on how to proceed =). > > --------------------------------------------------------------------------- > ---------------------- > TreKing <http://sites.google.com/site/rezmobileapps/treking> - Chicago > transit tracking app for Android-powered devices -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
