Day 178 of 180 Days of Data Viz Learning #jfdi #dataviz

I’m doing some form of data visualization learning for 180 days because I need to #JFDI.

See post explaining how and why I’m doing this.

Eljiah Meeks D3.js in Action

Chapter 4 General Charting Principles 

Three Takeways Today

// Callback function breakdowns

var n = 0 // counter to increment
for (x in data[0])
if (x != day) { //not drawing a line for day value of each object because this is giving x value of coordinate
var movieArea = d3.svg.area() // generator that iterates through each objet that corresponds to one of our movies using day vlaue for x coorindate but iterating through values for each movie for the y coordinates
.x(function(d) {
return xScale(
.y(function(d) {
return yScale(d,x))
.y0(function(d) {
return yScale(simpleStacking(d,x) – d[x])

// Stacking function. Takes incoming bound data and name of attr and loops throuhg the incoming data, adding each value until it reaches current named attribute. As a result, it returns the total value for every movie during this day up to the movie we’ve sent.

function simpleStacking(incomingData, incomingAttribute) {
var newHeight = 0
for (x in incomingData) {
if (x != “day”) {
newHeight += parseInt(incomingData[x]);
if (x == incomingAttribute) {
return newHeight;
// Stacking function that alternates vertical position of area drawn p 136


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