Makeover Monday - Valentines

readme.md

Entry for Makeover Monday week 7, How Much Do Americans Spend on Valentine’s Day? Uses https://bl.ocks.org/mbostock/6081914 suggested approach for chaining repeated transitions. Uses the easeElasticOut to achieve the heart beating effect, which updates the viewBox coordinates inversely based on the heart's desired area. See my blog post for more information: https://www.tomshanley.co.nz/blog/2017/3/1/be-still-my-beating-heart-svg-viewbox-transitions-to-animate-custom-shapes

d3.min.js

// https://d3js.org Version 4.1.0. Copyright 2016 Mike Bostock.
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pv=jt.prototype=Ht.prototype;pv.copy=function(){var t,n,e=new Ht(this._x,this._y,this._x0,this._y0,this._x1,this._y1),r=this._root;if(!r)return e;if(!r.length)return e._root=Xt(r),e;for(t=[{source:r,target:e._root=new Array(4)}];r=t.pop();)for(var i=0;i<4;++i)(n=r.source[i])&&(n.length?t.push({source:n,target:r.target[i]=new Array(4)}):r.target[i]=Xt(n));return e},pv.add=kt,pv.addAll=St,pv.cover=At,pv.data=Et,pv.extent=Ct,pv.find=Pt,pv.remove=qt,pv.removeAll=Lt,pv.root=Rt,pv.size=Ut,pv.visit=Dt,pv.visitAfter=Ot,pv.x=It,pv.y=Bt;var dv=[].slice,vv={};Vt.prototype=Qt.prototype={constructor:Vt,defer:function(t){if("function"!=typeof t||this._call)throw new Error;if(null!=this._error)return this;var n=dv.call(arguments,1);return n.push(t),++this._waiting,this._tasks.push(n),Wt(this),this},abort:function(){return null==this._error&&Gt(this,new Error("abort")),this},await:function(t){if("function"!=typeof t||this._call)throw new Error;return this._call=function(n,e){t.apply(null,[n].concat(e))},Jt(this),this},awaitAll:function(t){if("function"!=typeof t||this._call)throw new Error;return this._call=t,Jt(this),this}};var _v=1e-12,yv=Math.PI,gv=yv/2,mv=2*yv;fn.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._point=0},lineEnd:function(){(this._line||0!==this._line&&1===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1,this._line?this._context.lineTo(t,n):this._context.moveTo(t,n);break;case 1:this._point=2;default:this._context.lineTo(t,n)}}};var xv=xn(ln);mn.prototype={areaStart:function(){this._curve.areaStart()},areaEnd:function(){this._curve.areaEnd()},lineStart:function(){this._curve.lineStart()},
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e=Math.sqrt(n),r=-e/2;t.rect(r,r,e,e)}},Pv=Math.sqrt(3),qv={draw:function(t,n){var e=-Math.sqrt(n/(3*Pv));t.moveTo(0,2*e),t.lineTo(-Pv*e,-e),t.lineTo(Pv*e,-e),t.closePath()}},Lv=-.5,Rv=Math.sqrt(3)/2,Uv=1/Math.sqrt(12),Dv=3*(Uv/2+1),Ov={draw:function(t,n){var e=Math.sqrt(n/Dv),r=e/2,i=e*Uv,o=r,u=e*Uv+e,a=-o,c=u;t.moveTo(r,i),t.lineTo(o,u),t.lineTo(a,c),t.lineTo(Lv*r-Rv*i,Rv*r+Lv*i),t.lineTo(Lv*o-Rv*u,Rv*o+Lv*u),t.lineTo(Lv*a-Rv*c,Rv*a+Lv*c),t.lineTo(Lv*r+Rv*i,Lv*i-Rv*r),t.lineTo(Lv*o+Rv*u,Lv*u-Rv*o),t.lineTo(Lv*a+Rv*c,Lv*c-Rv*a),t.closePath()}},Fv=[bv,wv,kv,zv,Cv,qv,Ov];Sn.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._y0=this._y1=NaN,this._point=0},lineEnd:function(){switch(this._point){case 3:Nn(this,this._x1,this._y1);case 2:this._context.lineTo(this._x1,this._y1)}(this._line||0!==this._line&&1===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1,this._line?this._context.lineTo(t,n):this._context.moveTo(t,n);break;case 1:this._point=2;break;case 2:this._point=3,this._context.lineTo((5*this._x0+this._x1)/6,(5*this._y0+this._y1)/6);default:Nn(this,t,n)}this._x0=this._x1,this._x1=t,this._y0=this._y1,this._y1=n}},En.prototype={areaStart:kn,areaEnd:kn,lineStart:function(){this._x0=this._x1=this._x2=this._x3=this._x4=this._y0=this._y1=this._y2=this._y3=this._y4=NaN,this._point=0},lineEnd:function(){switch(this._point){case 1:this._context.moveTo(this._x2,this._y2),this._context.closePath();break;case 2:this._context.moveTo((this._x2+2*this._x3)/3,(this._y2+2*this._y3)/3),this._context.lineTo((this._x3+2*this._x2)/3,(this._y3+2*this._y2)/3),this._context.closePath();break;case 3:this.point(this._x2,this._y2),this.point(this._x3,this._y3),this.point(this._x4,this._y4)}},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1,this._x2=t,this._y2=n;break;case 1:this._point=2,this._x3=t,this._y3=n;break;case 2:this._point=3,this._x4=t,this._y4=n,this._context.moveTo((this._x0+4*this._x1+t)/6,(this._y0+4*this._y1+n)/6);break;default:Nn(this,t,n)}this._x0=this._x1,this._x1=t,this._y0=this._y1,this._y1=n}},zn.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._y0=this._y1=NaN,this._point=0},lineEnd:function(){(this._line||0!==this._line&&3===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){switch(t=+t,n=+n,this._point){case 0:this._point=1;break;case 1:this._point=2;break;case 2:this._point=3;var e=(this._x0+4*this._x1+t)/6,r=(this._y0+4*this._y1+n)/6;this._line?this._context.lineTo(e,r):this._context.moveTo(e,r);break;case 3:this._point=4;default:Nn(this,t,n)}this._x0=this._x1,this._x1=t,this._y0=this._y1,this._y1=n}},qn.prototype={lineStart:function(){this._x=[],this._y=[],this._basis.lineStart()},lineEnd:function(){var t=this._x,n=this._y,e=t.length-1;if(e>0)for(var r,i=t[0],o=n[0],u=t[e]-i,a=n[e]-o,c=-1;++c<=e;)r=c/e,this._basis.point(this._beta*t[c]+(1-this._beta)*(i+r*u),this._beta*n[c]+(1-this._beta)*(o+r*a));this._x=this._y=null,this._basis.lineEnd()},point:function(t,n){this._x.push(+t),this._y.push(+n)}};var Iv=function Tw(t){function n(n){return 1===t?new Sn(n):new qn(n,t)}return n.beta=function(t){return Tw(+t)},n}(.85);Rn.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._x2=this._y0=this._y1=this._y2=NaN,this._point=0},lineEnd:function(){switch(this._point){case 2:this._context.lineTo(this._x2,this._y2);break;case 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t?new Yn(n,t):new Dn(n,0)}return n.alpha=function(t){return Cw(+t)},n}(.5);Bn.prototype={areaStart:kn,areaEnd:kn,lineStart:function(){this._point=0},lineEnd:function(){this._point&&this._context.closePath()},point:function(t,n){t=+t,n=+n,this._point?this._context.lineTo(t,n):(this._point=1,this._context.moveTo(t,n))}},$n.prototype={areaStart:function(){this._line=0},areaEnd:function(){this._line=NaN},lineStart:function(){this._x0=this._x1=this._y0=this._y1=this._t0=NaN,this._point=0},lineEnd:function(){switch(this._point){case 2:this._context.lineTo(this._x1,this._y1);break;case 3:Wn(this,this._t0,Vn(this,this._t0))}(this._line||0!==this._line&&1===this._point)&&this._context.closePath(),this._line=1-this._line},point:function(t,n){var e=NaN;if(t=+t,n=+n,t!==this._x1||n!==this._y1){switch(this._point){case 0:this._point=1,this._line?this._context.lineTo(t,n):this._context.moveTo(t,n);break;case 1:this._point=2;break;case 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data.csv

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <title>Valentines #MakeoverMonday</title>

    <!-- CSS -->
    <link href='//fonts.googleapis.com/css?family=Sofia' rel='stylesheet'>

    <style>
      html, body, svg {
        font-family: 'Sofia', cursive;
        text-align: center;
      }
    </style>

    <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
      <script src="https://oss.maxcdn.com/html5shiv/3.7.3/html5shiv.min.js"></script>
      <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
  </head>
  <body>
    <div>
      <h1>Valentines #MakeoverMonday</h1>
      <h2 class="year-heading">
        The average spend in 2008
      </h2>
      <p>
        The hearts' size corresponds to the average spend per year. The colour increases in depth per year.
      </p>
    </div>
    <div class="hearts"></div>

    <p>
      Data source:
      <a href="https://nrf.com/sites/default/files/Valentine%27s%20Day%201-18-16%20press.pdf" target="_blank">National Retail Foundation</a>
    </p>

    <script src="d3.min.js"></script>
    <script src="valentines.js"></script>

  </body>
</html>

thumbnail.png

valentines.js

//const chartHeight = 600;
const margin = {top: 0 , bottom: 0, left: 0, right: 0};
var year = 2007;
const chartWidthHeight = 100;
const heartPath = "m-1.249995,-26.393731c19.790171,-56.111793 97.328709,0 0,72.143734c-97.328709,-72.143734 -19.790171,-128.255527 0,-72.143734z";

d3.csv("data.csv", convertTextToNumbers, function(error, data) {

  if (error) error ;

  var n = data.length;

  var heartDiv = d3.select(".hearts").selectAll(".heart")
  .data(data)
  .enter()
  .append("div");

  heartDiv.append("h2")
  .attr("class", "heading")
  .text(heading);

  var heartSVG = heartDiv.append("svg")
  .attr("width", chartWidthHeight)
  .attr("height", chartWidthHeight)
  .attr("viewBox", viewBox)
  .attr("preserveAspectRatio", "xMidYMid meet")
  .call(beat, 1000);

  heartSVG.append("path")
  .attr("id", function(d){ return d.objectOfAffection; })
  .attr("d", heartPath)
  .style("fill", "IndianRed")
  .style("stroke", "Crimson")
  .style("stroke-width", "3px")
  .style("opacity", opacity);

});

// https://bl.ocks.org/mbostock/6081914
function beat(selection, duration) {

  year = year === 2016 ? 2008 : year + 1;
  var amp = 1;
  var period = 0.2;

  selection.transition()
     .duration(duration)
     .ease(d3.easeElasticOut.amplitude(amp).period(period))
     .attr("viewBox", viewBox);

  selection.selectAll("path")
    .transition()
    .duration(duration)
    .ease(d3.easeElasticOut.amplitude(amp).period(period))
    .style("opacity", opacity);

  d3.selectAll(".heading").text(heading);

  var yearHeading = "The average spend in " + year;
  d3.select(".year-heading").text(yearHeading);

 setTimeout(function() { beat(selection, duration); }, duration);

};

function opacity(d) {
  return 1 - (2017-year)/10;
}

function viewBox(d) {
  var viewBoxWH = svgDimension(d);
  var viewBoxXY = -(svgDimension(d) / 2);
  return viewBoxXY + " " + viewBoxXY + " " + viewBoxWH + " " + viewBoxWH;
};

function svgDimension(d) {
  var yearCol = "y" + year;
  var proportion = chartWidthHeight / d[yearCol];
  var sqrtProp = Math.sqrt(proportion);
  return chartWidthHeight * sqrtProp;
  //return Math.sqrt(chartWidthHeight - d[yearCol]);
  //console.log(d[yearCol]/maxSpend);
  //return chartWidthHeight + (chartWidthHeight * (1/(chartWidthHeight - d[yearCol])));
}

function heading(d) {
  var yearCol = "y" + year;
  return d.objectOfAffection + " $" + d[yearCol];
};

function convertTextToNumbers(d) {
  d.y2008 = +d.y2008;
  d.y2009 = +d.y2009;
  d.y2010 = +d.y2010;
  d.y2011 = +d.y2011;
  d.y2012 = +d.y2012;
  d.y2013 = +d.y2013;
  d.y2014 = +d.y2014;
  d.y2015 = +d.y2015;
  d.y2016 = +d.y2016;
  return d;
};