Prateeksha Singh pratu16x7

This example pulls together various examples of work with trees in D3.js.

The panning functionality can certainly be improved in my opinion and I would be thrilled to see better solutions contributed.

One can do all manner of housekeeping or server related calls on the drop event to manage a remote tree dataset for example.

Dragging can be performed on any node other than root (flare). Dropping can be done on any node.

Panning can either be done by dragging an empty part of the SVG around or dragging a node towards an edge.

Git Submodules - Basic Explanation

Why submodules?

In Git you can add a submodule to a repository. This is basically a repository embedded in your main repository. This can be very useful. A couple of usecases of submodules:

Separate big codebases into multiple repositories.

C++ Pointer Tutorial

Because pointers can be ugh

"Regular" variables (not pointers)

To understand a pointer, let's review "regular" variables first. If you're familiar with a programming language without pointers like JavaScript, this is what you think when you hear "variable".

When declaring a variable by identifier (or name), the variable is synonymous with its value.

Setting up flask app in heroku with a database

The below article will cover the intricacies of setting up databases and heroku in respect to a flask app. This is more like a memo and will have out of sequence instructions or solutions to errors so read thoroughly.

Setting up a database

You'll need the packages

	#include <iostream>
	#include <string>
	#include <curl/curl.h>


	static size_t WriteCallback(void contents, size_t size, size_t nmemb, void userp)
	{
	((std::string)userp)->append((char)contents, size * nmemb);
	return size * nmemb;
	}

	#include <curl/curl.h>
	#include <string>

	size_t writeFunction(void ptr, size_t size, size_t nmemb, std::string data) {
	data->append((char) ptr, size nmemb);
	return size * nmemb;
	}

	int main(int argc, char** argv) {
	auto curl = curl_easy_init();

	#!/bin/sh

	# ngrok's web interface is HTML, but configuration is bootstrapped as a JSON
	# string. We can hack out the forwarded hostname by extracting the next
	# `*.ngrok.io` string from the JSON
	#
	# Brittle as all get out--YMMV. If you're still reading, usage is:
	#
	# $ ./ngrok_hostname.sh <proto> <addr>
	#

	<meta name="description" content="{{ if .IsHome }}{{ .Site.Params.description }}{{ else }}{{ .Description }}{{ end }}"/>
	<meta name="robots" content="noodp"/>
	<link rel="canonical" href="{{ .Permalink }}" />

	<!-- Twitter Card -->
	<meta name="twitter:card" content="summary" />
	<meta name="twitter:description" content="{{ if .IsHome }}{{ .Site.Params.description }}{{ else }}{{ .Description }}{{ end }}" />
	<meta name="twitter:title" content="{{ .Title }}{{ if .IsHome }} - {{ .Site.Params.Tagline }}{{ else }} - {{ .Site.Title }}{{ end }}" />
	<meta name="twitter:site" content="{{ .Site.Params.twitter }}" />
	<meta name="twitter:creator" content="{{ .Site.Params.twitter }}" />

	<!DOCTYPE html>
	<html>
	<head>
	<script>
	var data
	var formId = 'form'

	function drawForm() {
	if (!data) return
	var outputEl = document.getElementById(formId);