zshell31

"""
Tested on Linux with python 3.7
Must have portaudio installed (e.g. dnf install portaudio-devel)

pip install pyqtgraph pyaudio PyQt5
"""
import numpy as np
import pyqtgraph as pg
import pyaudio
from PyQt5 import QtCore, QtGui

zshell31

/** Links:
 *  - http://stackoverflow.com/questions/36368919/scrollable-image-with-pinch-to-zoom
 *  - http://blog.lum.pe/gesture-detection-in-react-native-fixing-unexpected-panning/
 *
 */

import React, {Component, PropTypes} from 'react';
import { Text, View, PanResponder, Image } from 'react-native';

function calcDistance(x1, y1, x2, y2) {

zshell31

"changing dots" optical illusion w/ bg gradients😎😵

Creating another optical illusion with CSS.

As your eyes move around the page, the dots should change between white and black.

Simply made with a combination of background size and use of gradients.

Enjoy!

zshell31

function api(method, uri, body) {
    url = 'http://localhost:3000/' + uri;
    return fetch(url, {
        method: method,
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json'
        },
        body: JSON.stringify(body)
    })

zshell31

Links

• http://teropa.info/blog/2015/09/10/full-stack-redux-tutorial.html
• https://www.gitbook.com/book/maxfarseer/redux-course-ru
• https://survivejs.com/webpack_react

Creating package.json

npm init -y

zshell31

* For details: https://www.opennet.ru/base/sec/gpg_crypt.txt.html
* Also: http://f3arnil.blogspot.ru/2011/06/linux-apt-key.html

#!/bin/sh

KEY_SERVER=p80.pool.sks-keyservers.net

if [ -z $1 ]
then
    KEYS='sudo apt-get -qq update 2>&1 | awk '/NO_PUBKEY/ {print($NF)}' | uniq | tr '\n' '\ ''

zshell31

var DEBUG = false;

var debug = function(msg) {
    if (DEBUG) {
        console.log(msg);
    }
}

Function.prototype.curry = function() {
    this.argList || (this.argList = []);

zshell31

/* Copy a regular file from SRC_NAME to DST_NAME.
   If the source file contains holes, copies holes and blocks of zeros
   in the source file as holes in the destination file.
   (Holes are read as zeroes by the `read' system call.)
   When creating the destination, use DST_MODE & ~OMITTED_PERMISSIONS
   as the third argument in the call to open, adding
   OMITTED_PERMISSIONS after copying as needed.
   X provides many option settings.
   Return true if successful.
   *NEW_DST is as in copy_internal.

zshell31

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

zshell31

var next = function(p, $scope) {
    var create = function($scope, time) {
        var time = time || 1000;
        return new Promise(function(resolve, reject) {
            setTimeout(function() {
                console.log("Promise: " + $scope.val);
                $scope.val++;
                resolve($scope);
            }, time);
        });