maps | 易学教程

Android googlemap Out of memory

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问题 I made an android application with googlemap api, and draw some 16x16 png (about 200 count) on overlay. When I move or zoom on/in mapview, "out of memory" error occurs very often. I also used the googlemap appication in my htc itself. Seams that it uses about 14+MB memmory, and never happens "out of memory". How to save memmory usage in a googlemap api, or how to enlarge android api memmory limit. Thanks a lot! 回答1: My own solution: Catching OutOfMemoryError when zoomin/zoomout, will prevent

How to create auto-scalling image lying on WP8 maps

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问题 I am trying to add multiple pushpins to the map, that disappear when you zoom out enough, to make the pushpins so little, that they are not rendered anymore. I managed to achieve this effect with the following code: MapPolygon shape = new MapPolygon(); GeoCoordinateCollection boundingLocations = CreateCircle(geoCoordinate, 0.1); shape.Path = boundingLocations; shape.FillColor = Color.FromArgb(0x55, 0xFF, 0xFF, 0x00); shape.StrokeColor = Color.FromArgb(0xFF, 0xFF, 0x00, 0xFF); shape

Using the pre-installed Google Maps instead of an own activity by using Intents?

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问题 I just wanted to know whether it is possible to pass geocoords to the google maps app bis intents or something similar. I wrote an app for displaying route, coordinations and so on by myself, but wouldn't it be more elegant to ask google maps itself for displaying this? I don't know if this is possible, but maybe, one of you can answer this question. IF THIS IS POSSIBLE, is it also possible to ask google maps to calculate the route by my CURRENT POSITION? It would be great if one of you can

readOGR (rgdal) fails to fetch polygon names from XML

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问题 I am trying to import an KML map of CCG boundaries in England (Available here, 200Kb) into R using readOGR function from package rgdal . My end-goal is to create a heat-map by colouring CCGs according to some associated value. I have a list with those values next to CCG names in one data frame. I need to match CCG names in that data frame with CCG names in the imported map object, and assign colours based on the value. However, I cannot see any CCG names imported in the map object, although

How to use BOOST_FOREACH with two std::maps?

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问题 I have code that looks essentially like this: std::map<int, int> map1, map2; BOOST_FOREACH(int i, map1) { // do steps 1-5 here... } BOOST_FOREACH(int i, map2) { // do steps 1-5 (identical to above) here... } Is there any way to concatenate the maps to eliminate the duplicate code in the second loop? Or a way to extend BOOST_FOREACH to iterate over two different maps in one go? Obviously I don't want to increase the time complexity of the program (otherwise I could just create a new map and

How can I get the polygon object in google maps, when a path changed?

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问题 I have a lot of polygons created dynamically on a Google Maps, using API v3. I don't have a global array of them. I assign event for each after creation, because I need to track the changes made to them by the user. Everything work fine, except one thing. path = polygon.getPath(); //Note, that polygon isn't a global variable //DragEnd google.maps.event.addListener(polygon, "dragend", function(){ SavePolygonToDb(this); }); //Edited google.maps.event.addListener(path, "set_at", function() { /

.Net windows application WebBrowser / Google Maps API v3

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问题 I'm developing an application in which the user will be able to enter a desired address and then press a button. This address will be found on the WebBrowser control in a .net windows application. I know that you can run javascripts on WebBrowser by using the WebBrowser1.DocumentText , and the calling the script by WebBrowser1.Document.InvokeScript ... I'm having little issues with this and I was wondering if someone could show me the right way in order to do it. CODE: Private Sub Button1

Determine if a string is a valid geographic location

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问题 I've got a bunch of "locations" - some are accurate (gaborone, botswana), some are geocodes (40.75,-73.997) and some are completely useless (#siliconcape). I need to find a way to run through the list and determine the City and Country of each string and geocode, and return nulls for the invalid locations. Is there some sort of library/service/api/method that can be used to determine whether or not a given string represents a valid geographical location? While accounting for typos, ordering

How can I prevent popup showing by clik on marker in Leaflet?

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问题 I want popup doesn't show itself when I click on Leaflet marker. I cannot use clickable : false because I it will make the markers "act as a part of the underlying map" and this is unacceptable for me. I tried the next code marker.on('click', function(event) { event.originalEvent.preventDefault(); }); without any results. What is the right way to prevent popup showing without using clickable : false property of marker object. Edit 1: All I need is to open all the popus on the map by clicking

Spring Boot配置文件

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配置文件 Spring Boot使用一个全局的配置文件，配置文件的名称是固定的：　　application.properties 　　application.yml 配置文件的作用，修改Spring Boot自动配置的默认值，Spring Boot在底层都给我们自动配置好。标记语言：　　以前的配置文件，都是以“xxx.xml”文件；　　YAML：以数据为中心，比json.xml更适合用作配置文件。　　YAML实例：　　 server: port: 8080 YAML语法：　　1、基本语法　　　　K:(空格)V：表示一对键值对（空格必须有）　　　　以空格的缩进来控制层级关系，只要左对齐的一列数据，都是同一层级的　　注：属性和值也是大小写敏感　　2、值得写法　　　　字面量：普通的值（数字、字符串、布尔）　　　　　　k: v 字面值直接写　　　　　　　　字符串不用加上单引号或双引号　　　　　　　　“”：双引号，不会转译特殊字符　　　　　　　　‘’：单引号，会转译特殊字符，以普通字符串输出　　　　对象、Map：属性和值（键值对）　　　　　　k: v 　　　　　　　　值还是k: v值的方式　　　　　　　　 person: lastName: zhangsan age: 20 boss: false 　　　　数组（List、Set）：　　　　　