wjx

#Create your own map with OpenStreetMap

This is some note of me playing with OpenStreetMap and creating an Android app that renders the map drawn.

##Draw a map

###Get GPS trace

If you want to draw your own map, OpenStreetMap

	var http = require("http");
	var Promise = require("promise");

	function getAuthor(type) {
	return new Promise(function(resolve, reject) {
	var request = http.request({
	hostname: "eloquentjavascript.net",
	path: "/author",
	method: "GET",
	headers: {Accept: type}

	//http://www.geeksforgeeks.org/sorted-array-to-balanced-bst/
	//is the better solution(return created node, instead of a separated
	//insert operation).
	//Note here int mid = (int)Math.floor(n / 2); is used to get the middle
	//node instead of int mid = (start + end) / 2;, resulting right middle
	//node is selected when there is even number of nodes in the array.

	import java.util.*;
	import java.lang.*;
	import java.io.*;

	function all(promises) {
	return new Promise(function(success, fail) {
	// Your code here.
	function promiseThen(i) {
	return promises[i].then(function(res) {
	//we should return the res here.
	//push into results here won't work, since
	//promises here settles at different time
	//and elements in results will be out of order.
	return res;

	//Ref:
	//https://developers.google.com/web/fundamentals/getting-started/primers/promises

	function requestAuthor(type) {
	return new Promise(function(resolve, reject) {
	var req = new XMLHttpRequest();
	req.open("GET", "http://eloquentjavascript.net/author", true);
	req.setRequestHeader("accept", type);
	req.onload = function() {
	if(req.status == 200) {

	var playerSprites = document.createElement("img");

	var extraCanvas = document.createElement("canvas");
	var extraCx = extraCanvas.getContext("2d");
	playerSprites.src = "img/player.png";
	playerSprites.addEventListener("load", function(event) {
	var width = playerSprites.width;
	var height = playerSprites.height;
	extraCx.scale(-1, 1);
	extraCx.translate(-width, 0);

	<!doctype html>

	<style>
	.trail { /* className for the trail elements */
	position: absolute;
	height: 6px; width: 6px;
	border-radius: 3px;
	background: teal;
	}
	body {

	/*
	* Copyright (C) 2010 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software

	//bionic/libc/stdio/stdio.c
	int
	__sread(void cookie, char buf, int n)
	{
	FILE *fp = cookie;
	int ret;

	ret = TEMP_FAILURE_RETRY(read(fp->_file, buf, n));
	/* if the read succeeded, update the current offset */
	if (ret >= 0)

	#!/usr/bin/python

	'''
	Copyright 2009, The Android Open Source Project

	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0