Flutter & Dart

Flutter & Dart

https://www.dartlang.org/install

https://flutter.dev/

https://flutter.dev/docs/get-started/install/macos

flutter_macos_v1.2.1-stable.zip & 464 MB

https://storage.googleapis.com/flutter_infra/releases/stable/macos/flutter_macos_v1.2.1-stable.zip

https://flutter.dev/docs/development/tools/sdk/archive

https://flutter.dev/community/china

https://flutter-io.cn/

https://codelabs.flutter-io.cn/

https://codelabs.flutter-io.cn/codelabs/first-flutter-app-pt1-cn/index.html#0

https://classroom.udacity.com/courses/ud905

---

https://flutter.dev/docs/get-started/install/macos#get-the-flutter-sdk

https://flutter.dev/docs/get-started/install/macos#update-your-path

# pwd
export PATH="$PATH:`pwd`/flutter/bin"
# export PATH="$PATH:[PATH_TO_FLUTTER_GIT_DIRECTORY]/flutter/bin"
# pwd === /Users/xgqfrms-mbp
 export PATH="$PATH:/Users/xgqfrms-mbp/Documents/Flutter/flutter/bin"

Flutter 1.2

https://flutter-io.cn/posts/launching-flutter-12-at-mobile-world.html

---

zsh bug

https://github.com/flutter/flutter/issues/29539#issuecomment-473825598

zsh !== native terminal

.zshrc !== .bash_profile

$ cat .zshrc
$ vim .zshrc
# flutter PATH & zsh
export PATH="$PATH:/Users/xgqfrms-mbp/Documents/Flutter/flutter/bin"
$ source $HOME/.zshrc

.zshrc path

current user path

---

https://mirrors.sjtug.sjtu.edu.cn/#/

https://github.com/sjtug

rss-parser

import axios from 'axios'
import Parser from 'rss-parser'
import _ from 'lodash'
// The type of the return value of getFeeds()
// for documenting purpose only
// eslint-disable-next-line
function getFeedsResult () {
  this.title = 'title of feed'
  this.pubDate = new Date()
  this.url = 'https://test.com'
}
/**
 * @param {string} url
 * @fulfill {getFeedsResult[]}
 * @reject {Error}
 * @return {Promise.<getFeedsResult[]>}
 */
async function getFeeds (url) {
  const parser = new Parser()
  return parser.parseURL(url)
    .then(({items}) => _.map(items, rssItem => ({
      title: rssItem.title,
      url: rssItem.link,
      pubDate: new Date(rssItem.pubDate)
    })))
}
/**
 *
 * @param {string} url
 * @return {Promise.<Object.<string, string>>} an object: name => desciption HTML
 */
async function getHelps (url) {
  const parser = new Parser()
  return parser.parseURL(url)
    .then(({items}) => _.fromPairs(_.map(items, item => [item.title, item.content])))
}
// eslint-disable-next-line
function getBackendSummarySingleResult () {
  this.name = 'name of this repo'
  this.idle = false
  this.result = true
  this.lastFinished = new Date()
}
/**
 * @param {string} url
 * @return {Promise.<getBackendSummarySingleResult[]>}
 */
async function getBackendSummary (url) {
  return axios.get(url)
    .then(({data}) => _.map(data.WorkerStatus, (val, key) => ({
      name: key,
      idle: val.Idle,
      result: val.Result,
      lastFinished: new Date(val.LastFinished)
    })))
    .then(data => _.sortBy(data, 'name'))
}
export {
  getFeeds,
  getBackendSummary,
  getHelps
}
// WEBPACK FOOTER //
// ./src/api/index.js

https://sjtug.org/js/rocket.js

https://github.com/sjtug/sjtug-mirror-frontend

https://github.com/sjtug/lug

var scene, camera, renderer, rocket, fire, mx, my;
var firescale = 1;
var rot_axis = new THREE.Vector3(0, 0, 1);
var trans_axis = new THREE.Vector3(-0.5, 0, 0.8);
var rot_lean = new THREE.Vector3(0, 1, 0);
var axis_c = new THREE.Vector3(0,0,0);
var axis_s = new THREE.Vector3(0,0,0);
var axis_h = (new THREE.Vector3(0,1,0)).applyAxisAngle(rot_axis, -0.02);
var axis_w = (new THREE.Vector3(1,0,0)).applyAxisAngle(rot_axis, -0.02);
var camera_pos = new THREE.Vector3(0, 0, 30);
var current_pos = new THREE.Vector3(0,0,0);
var delta = new THREE.Vector3(0,0,0);
var speedX = 0;
var speedY = 0;
var firel = 0.4;
var firer = 0.2;
var mx = 0;
var my = 0;
var xs = 0;
init();
function init(){
    //scene = new THREE.Scene();
    var WIDTH = 240;
    var HEIGHT = 240;
    renderer = new THREE.WebGLRenderer({'antialias':true});
    renderer.setSize(WIDTH, HEIGHT);
    camera = new THREE.PerspectiveCamera(45, WIDTH/HEIGHT, 0.1, 20000);
    camera.position = camera_pos;
    camera.lookAt(axis_c);
    var loader = new THREE.SceneLoader();
    loader.load("/js/rocket.json", function(s){
      scene = s.scene;
      rocket = s.objects['Rocket'];
      fire = s.objects['Fire'];
      rocket.rotateOnAxis(rot_axis, 1.508);
      rocket.translateOnAxis(trans_axis, -2)
      rocket.rotateOnAxis(rot_lean, -0.63);
      fire.rotateOnAxis(rot_axis, 1.508);
      fire.translateOnAxis(trans_axis, -2)
      fire.rotateOnAxis(rot_lean, -0.63);
      scene.add(camera);
      document.body.onmousemove = function(e){
        var w = document.body.clientWidth/2;
        mx = w-e.pageX;
        if(firel<0.7) my = 300-e.pageY;
        else {
          mx=mx*0.2+xs;
          my=300;
        }
      }
      if (window.DeviceMotionEvent) {
        deviceMotionHandler = function(e) {
          document.body.onmousemove = null;
          var ax = event.accelerationIncludingGravity.x;
          var ay = event.accelerationIncludingGravity.y;
          var orient = window.orientation;
          if (orient==0) {
            mx = -ax * 80;
            my = -ay * 80;
          }
          else if (orient==90) {
            mx = ay * 80;
            my = -ax * 80;
          }
          else if (orient==-90) {
            mx = -ay * 80;
            my = -ax * 80;
          }
          else if (orient==180) {
            mx = -ax * 80;
            my = ay * 80;
          }
        }
        window.ondevicemotion = function(e) {
          var acc = e.acceleration;
          if (acc.x != null || acc.y != null || acc.z != null) {
            document.body.onmousemove = null;
            window.ondevicemotion = deviceMotionHandler;
          } else {
            window.ondevicemotion = null;
          }
        }
      }
      var logo = document.getElementById('logo');
      logo.classList.add('ani');
      logo.appendChild(renderer.domElement);
      var joinLink = document.getElementById('join');
      if (joinLink) {
        joinLink.onmouseover = function(e){
          firel = 0.8;
          firer = 0.1;
          var w = document.body.clientWidth/2;
          xs = w - e.pageX;
          if (xs>80) xs=160;
          else if (xs<-80) xs=-160;
          else xs = 0;
        }
        joinLink.onmouseout = function(e){
          firel = 0.4;
          firer = 0.2;
        }
      } else { // support pages with no join link
          firel = 0.4;
          firer = 0.2;
      }
      animate();
    });
}
function step(camera) {
  if (mx > 1000) mx = 1000;
  else if (mx < -1000) mx = -1000;
  if (my > 1000) my = 1000
  else if (my < -1000) my = -1000;
  delta.set(-mx, my, 0).applyAxisAngle(rot_axis, -0.02).sub(current_pos);
  if (delta.x>20) delta.x=20;
  else if (delta.x<-20) delta.x=-20;
  if (delta.y>50) delta.y=50;
  else if (delta.y<-50) delta.y=-50;
  speedX += delta.x/2000;
  speedY += delta.y/8000;
  speedX *= 0.95;
  speedY *= 0.80;
  rocket.rotateOnAxis(rot_axis, speedX);
  camera.position.applyAxisAngle(axis_w, speedY);
  delta.x *= 0.5;
  current_pos.add(delta);
  if(firescale>=1) firescale = firel - firer*Math.random();
  else firescale = firel + firer*Math.random();
  fire.scale.z = firescale;
  if (firel>0.7) {
    axis_s.set(-Math.random(), -Math.random(), 0);
    axis_s.multiplyScalar(0.4);
    camera.lookAt(axis_s);
  }
  else camera.lookAt(axis_c);
}
function animate() {
  requestAnimationFrame(animate);
  step(camera);
  renderer.render(scene, camera);
}