maps

问题 I have a map with several areas denoted by a polygon. I want to enable some options and display some markers when the polygon is right in the middle of map and the right zoom level. How can I detect this. I can get the map bounds but have no idea how to use it to check if the polygon is in the map. Thanks for the help! 回答1: First, you'll need to get the bounds of your polygon. Use the getBounds function described here to get the bounds of your polygon. // This will return an L.LatLngBounds

问题 I have web content inside a UIWebView in my app. My goal is to have all links open normally inside the app, but any links starting with "http://maps", get opened in safari, so they can in turn be opened in the external iphone maps app. If you have a solution for this problem stop reading now, below I'm going to propose my solution. Currently all links are opened inside the app, so http://maps links open to m.google.com inside the app. The solution I'm thinking of involves this code which uses

问题 I want to make a map only with the external borders by groups of subregions. Bellow are plotted all the subregions and I want to make a map but only with the external borders of the regions which are in region column in the spain object. I have tried with several aes like fill and group or even grouping by before plotting it but can't find a proper way: library(rnaturalearth) library(tidyverse) spain <- ne_states(country = "spain", returnclass = "sf") spain %>% ggplot() + geom_sf() Created on

问题 In my app the admin can upload an adress from Google Maps and the user can open it by pressing a button (open). It is working perfectly on the emulator. The address from the Google Maps app in the emulator has this format : https://goo.gl/maps/7XN3foNbM2Ak9yNN9 , which works in both Activities. Problem is, when i am using the phone (Samsung S6 Edge Plus running Android 7), Google Maps gives me the address in this format instead: https://maps.app.goo.gl/eGPJ3Q2E7dXRbzvD8 , which is not working

问题 I have made a small map that I call BMW . It contains the keys Usage and Diesel , as shown below. #include <iostream> #include <bits/stdc++.h> #include <map> #include <vector> using namespace std; int main() { // initialize container std::map<string, std::tuple<string, string>> BMW; // insert elements BMW.insert({"Usage", {"1", "2"}}); BMW.insert({"Disel", {"2", "3"}}); std::cout << "Usage => " << BMW.find('Usage')->second << '\n'; return 0; } What I want to do is to find the key Usage in the

问题 I will need to push about 200 KML google maps to 200 people. The maps have each around 200-300 placemarks. Every placemark is either, an account, potential account, or past account. I am classifying each type of placemark with a different color pin. I would like to know how the user can see only one type of pins at a time. I know we can do this by using FOLDERS , but i think a better way would be to use LAYERS . The reason I think layers are better is because on mobile devices they are much

问题 I have tried to get the latitude and longitude position that was stored in MySQL. I want use the values to my Android map application. Here is my code: deskripsi.Java Button direction = (Button) findViewById (R.id.btnDir); direction.setOnClickListener(new OnClickListener(){ public void onClick(View arg0) { Intent z = getIntent(); des_lat = z.getExtras().getString("des_lat"); des_long = z.getExtras().getString("des_long"); Intent i = new Intent(android.content.Intent.ACTION_VIEW, Uri.parse(

问题 I want to use my image to replace the Compass image of MyLocationOverlay, how can i implement? 回答1: Subclass MyLocationOverlay, override the method drawCompass(Canvas canvas, float bearing), and draw your own bitmap(s) onto the canvas object: @Override protected void drawCompass(Canvas canvas, float bearing) { Resources res = _context.getResources(); Bitmap myCompassPointer = BitmapFactory.decodeResource(res, R.drawable.compass_pointer); float rotationAngle = -bearing + 360f; Matrix rotation

问题 I have a script that displays a bunch of addresses in a SQL database (They're all geocoded) and places them onto a google map. I can't seem to figure out how to have the map center on the user's location using their mobile device GPS. I have a script that does this but I can't figure out how to combine the two features. Anyone? Please help me, loosing sleep... Here is my code: <?php require_once('/home/session_data.php'); ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www

问题 When plotting map of USA, I get the map but with a big white triangle in the middle. Anyone sees the same? require(ggplot2) require(ggmap) require(maps) US <- map_data("usa", region=".") plot(ggplot(US, aes(x=long, y=lat)) + geom_polygon() + coord_map()) The above problem is fixed. Now I wan to mark cities on map with number of ads/calls/etc - a data frame of 4900 locations. However, google restricts usage to non-business users to 2500 per day. Do you know of a more elegant solution other