The google maps API has a function for getting the bounds of a map, which adjusts at each level.
So, this is just a matter of calling on that function every time, so you get current bounds. I will look at the stack later today. Just be careful with bounds. They can cause confusion with changes in the orientation of the map. Sent from my iPhone > On Jun 30, 2017, at 10:10 AM, William Prothero via use-livecode > <use-livecode@lists.runrev.com> wrote: > > Jonathan: > Here is a link to my test stack and some files I found that have various code > to find the corners of the downloaded map. > https://www.dropbox.com/s/8xle2hrltx9ll0d/googleMapsAPiTests.zip?dl=0 > <https://www.dropbox.com/s/8xle2hrltx9ll0d/googleMapsAPiTests.zip?dl=0> > My start on a conversion is in the script of the “Get Corners” button. I can > get an xml file from the regular maps api, but the “bounds” property doesn’t > change with zoom, which makes it not obvious how to convert that to what is > being displayed, to get the corners. I have no problem converting pixels to > mercator lat/lon, but until I can figure out the relationship between pixels > and zoom levels, I’m stuck. > > Thanks for any help. I know your augmented Earth application uses these maps > too, and I’m also willing to share code when I get this working. > > Bill P > >> On Jun 30, 2017, at 3:50 AM, Jonathan Lynch via use-livecode >> <use-livecode@lists.runrev.com> wrote: >> >> Hi Bill, >> >> Can you share the LC code and JS you are using? >> >> Sent from my iPhone >> >>> On Jun 29, 2017, at 9:59 PM, William Prothero via use-livecode >>> <use-livecode@lists.runrev.com> wrote: >>> >>> Folks: >>> I’ve found a way to display an image of a google static map, in my app. >>> It’s quite easy and well-documented. However, I need to get the lat and lon >>> values of the corners of the map, at the displayed zoom level. There is a >>> simple-looking javascript example for doing this at: >>> https://stackoverflow.com/questions/12507274/how-to-get-bounds-of-a-google-static-map >>> >>> <https://stackoverflow.com/questions/12507274/how-to-get-bounds-of-a-google-static-map> >>> My javascript knowledge is totally minimal and I am loath to learn >>> javascript just to get this one handler into livecode script. >>> >>> What I have is an application that plots geophysical data on a world map. >>> The map kind of ugly at very high magnifications and I thought the google >>> map would give me a nice map image, with a wider range of magnifications, >>> and minimize local storage space. What I will do is display the map image >>> (centered on a particular lat/lon and magnification) in a rectangle, then >>> take a snapshot, then copy my data symbols and images into the resulting >>> snapshot. This works very will with my current map. I know that I can draw >>> symbols directly on a google map using the map api, but it will be much >>> more direct, and build on existing code, if I do it as described. >>> >>> So if anyone who is familiar with javascript has a few moments to give me >>> some pointers on how I might convert this to LCS, I’d very much appreciate >>> it. What I’m scratching my head over is how to access the parameters from >>> the Google API to do the needed calculations. The link above is to the >>> javascript example. >>> >>> Thanks in advance, >>> Bill P >>> >>> William A. Prothero >>> http://earthlearningsolution.org/ >>> >>> _______________________________________________ >>> use-livecode mailing list >>> use-livecode@lists.runrev.com >>> Please visit this url to subscribe, unsubscribe and manage your >>> subscription preferences: >>> http://lists.runrev.com/mailman/listinfo/use-livecode >> >> _______________________________________________ >> use-livecode mailing list >> use-livecode@lists.runrev.com >> Please visit this url to subscribe, unsubscribe and manage your subscription >> preferences: >> http://lists.runrev.com/mailman/listinfo/use-livecode > > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your subscription > preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
