map

问题 Please how do i get the value of "lat" and "lon" outside their function to use else where on the page. navigator.geolocation.getCurrentPosition(handle_geolocation_query,handle_errors); function handle_errors(error) { switch(error.code) { case error.PERMISSION_DENIED: alert("user did not share geolocation data"); break; case error.POSITION_UNAVAILABLE: alert("could not detect current position"); break; case error.TIMEOUT: alert("retrieving position timed out"); break; default: alert("unknown

问题 OK, so the task is this, I would be given (x, y) co-ordinates of points with both (x, y) ranging from -10^6 to 10^6 inclusive. I have to check whether a particular point e.g. (x, y) tuple was given to me or not. In simple words how do i answer the query whether a particular point(2D) is set or not. So far the best i could think of is maintaining a std::map<std::pair<int,int>, bool> and whenever a point is given I mark it 1. Although this must be running in logarithmic time and is fairly

问题 i have a small map of a town, i want to place it into the google map, any idea how to do it ? i am doing so because i need google map to point out user current location. 回答1: Checkout the TileMap example code from Apple 回答2: To display a custom map in MKMapView your custom map needs to be in Keyhole Markup Language (KML). KML is a file format used to display geographic data in an Earth browser such as Google Earth, Google Maps, and Google Maps for mobile. The file can include custom images

问题 I've been looking for a way to check if a point is part of a polygon; this polygon is loaded from a file. All the answers related to this question are solved with javascript, but I require to do this on server-side; this because the result does not need to be shown to the user as a webclient, it needs to be stored and later be used as a parameter to select a group of users (that use the system) inside that area (polygon). I looked for a Google Maps API for PHP but it looks like it does not

问题 Please excuse my bad English, I'm French ! I've got a question about my Android App... I hava to integrate a google map, so I've followed a tutorial (from Google developper website), but when I when to try the Google Demo I've got a blank map ! Nothing is displayed and I've got this error : 06-17 14:34:29.067: E/Google Maps Android API(29152): Authorization failure. Please see https://developers.google.com/maps/documentation/android/start for how to correctly set up the map. 06-17 14:34:29

问题 I'm developing a turn-by-turn navigation software and I'm using the following solution to make my lines of roads into 2.5D or 3D View Draw 2.5D or 3D Map with C# from lines However, above solution is quite okay for lines within the view port which is 0 < x < width and 0 < y < height . However there are lines that its points may have y < 0 or x < 0 or y > height or x > width and then the above solution gone crazy. Could anyone help me figure out how to solve the problem? vvvv With 3D algorithm

问题 I'm developing a turn-by-turn navigation software and I'm using the following solution to make my lines of roads into 2.5D or 3D View Draw 2.5D or 3D Map with C# from lines However, above solution is quite okay for lines within the view port which is 0 < x < width and 0 < y < height . However there are lines that its points may have y < 0 or x < 0 or y > height or x > width and then the above solution gone crazy. Could anyone help me figure out how to solve the problem? vvvv With 3D algorithm

问题 I'm developing a turn-by-turn navigation software and I'm using the following solution to make my lines of roads into 2.5D or 3D View Draw 2.5D or 3D Map with C# from lines However, above solution is quite okay for lines within the view port which is 0 < x < width and 0 < y < height . However there are lines that its points may have y < 0 or x < 0 or y > height or x > width and then the above solution gone crazy. Could anyone help me figure out how to solve the problem? vvvv With 3D algorithm

问题 I am initializing a map map<string,int> ex; in C++. I could not find contains_key or similar function in stl, hence I am just using ex[inputString]++; The debugger shows the int to be initialized to zero correctly, is it a good assumption? 回答1: Yes, values that do not exist when accessed with operator[] are default-constructed. For numeric values, this is 0. That said, you're looking for the count method: bool hasElement = ex.count("element"); 来源： https://stackoverflow.com/questions/2346481

问题 I have a sequential file which is the output of hadoop map-reduce job. In this file data is written in key value pairs ,and value itself is a map. I want to read the value as a MAP object so that i can process it further. Configuration config = new Configuration(); Path path = new Path("D:\\OSP\\sample_data\\data\\part-00000"); SequenceFile.Reader reader = new SequenceFile.Reader(FileSystem.get(config), path, config); WritableComparable key = (WritableComparable) reader.getKeyClass()