September 2012
Intermediate to advanced
552 pages
14h 48m
English
Content preview from Professional HTML5 Mobile Game DevelopmentBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Plotting a Location on a Map
The latitude and longitude don’t tell you a whole lot, so one of the first things you must do is plot the location on a map. To do this you need access to a map API. Google Maps is one of the most popular map APIs and provides two different APIs: a static map API and the traditional interactive map you are probably familiar with.
Generating static maps is easy. All it involves is sending a properly formed request in the form of an <img> tag src to Google, which returns an image to you. The API for static maps is available at https://developers.google.com/maps/documentation/staticmaps/.
If you want a map with a marker at a specific location, you need to generate a URL with the size of the output image, the marker, and a value for the sensor option, which lets Google know whether this application uses a sensor to determine the position. (This field is required.) You also need to pass a zoom value to control how zoomed in the resultant image is.
Markers are defined by a number of attributes separated by pipe characters (|), for example:
markers=color:red||label:A|lat,longBecause this needs to be encoded into a URL, the pipe character is URL encoded into the string %7C.
Listing 23-2 shows the first example modified to output a static map at your location. Desktop browsers have wildly varying levels of accuracy, so it may show a location that’s only a rough approximation of your actual location.
Listing 23-2: Static map
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.