wuchengwei

https://stackoverflow.com/a/1165943

Some of the suggested methods will fail in the case of a non-convex polygon, such as a crescent. Here's a simple one that will work with non-convex polygons (it'll even work with a self-intersecting polygon like a figure-eight, telling you whether it's mostly clockwise).

Sum over the edges, (x2 − x1)(y2 + y1). If the result is positive the curve is clockwise, if it's negative the curve is counter-clockwise. (The result is twice the enclosed area, with a +/- convention.)

point[0] = (5,0)   edge[0]: (6-5)(4+0) =   4
point[1] = (6,4)   edge[1]: (4-6)(5+4) = -18
point[2] = (4,5)   edge[2]: (1-4)(5+5) = -30
point[3] = (1,5)   edge[3]: (1-1)(0+5) =   0

wuchengwei

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,

wuchengwei

var fs = require('fs');
var path = require('path');
var crypto = require('crypto');

function walk(dir, done) {
  var results = [];
  fs.readdir(dir, function(err, list) {
    if (err) return done(err);
    var pending = list.length;
    if (!pending) return done(null, results);

wuchengwei

//**dataURL to blob**
function dataURLtoBlob(dataurl) {
    var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],
        bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);
    while(n--){
        u8arr[n] = bstr.charCodeAt(n);
    }
    return new Blob([u8arr], {type:mime});
}

wuchengwei

#layout-main{
	left:0;
    top:0;
    margin:0;
    border-radius:0;
    box-shadow:none;
    display:flex;
    width:100%;
    height:100%;
    flex-flow: column nowrap;

wuchengwei

/*
 * @param {String} filepath
 * @param {function} callback function(err, data){}
 */
function readJsonFileAsync(filepath, callback) {
    var fs = require('fs');
    fs.readFile(filepath, 'utf-8', function(err, data) {
        if (err) { callback(err, null); }
        else {
            result = JSON.parse(data);

wuchengwei

//doHttpPost('localhost', 8000, '/TestPost', 'string' , 'TestTestTestTest', false);
//doHttpPost('localhost', 8000, '/TestPost', 'file' , '/Users/chengwei/Downloads/grid1.png', true);

function doHttpPost(_host, _port, _path, name, value, isFile, fileEncoding) {
	var http = require('http'),
	    fs = require('fs'),
	    path = require('path'),
	    boundary = Math.random(),
	    postData, postOptions, postRequest;