johnwalley · August 26, 2020 12:20
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <meta charset="utf-8">
 <style>

 body {
  font: 16px sans-serif;
 }

 .axis path,
 .axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
 }

 .x.axis path {
  display: none;
 }

 .line {
  fill: none;
  stroke: steelblue;
  stroke-width: 5px;
 }

 div.tooltip { 
    position: absolute;     
    text-align: center;     
    width: 140px;          
    height: 40px;         
    padding: 2px;       
    font: 16px sans-serif;    
    background: lightsteelblue; 
    border: 0px;    
    border-radius: 8px;     
    pointer-events: none;     
 }

 </style>
 <body>
 <script src="https://d3js.org/d3.v3.js"></script>
 <script>

 function loess(xval, yval, bandwidth)
 {
    function tricube(x) {
        var tmp = 1 - x * x * x;
        return tmp * tmp * tmp;
    }
 
 	var res = [];
 
 	var left = 0;
 	var right = Math.floor(bandwidth * xval.length) - 1;
 
 	for(var i in xval)
 	{
 		var x = xval[i];
 
 		if (i > 0) {
 			if (right < xval.length - 1 &&
 				xval[right+1] - xval[i] < xval[i] - xval[left]) {
 					left++;
 					right++;
 			}
 		}
 
 		var edge;
 		if (xval[i] - xval[left] > xval[right] - xval[i])
 			edge = left;
 		else
 			edge = right;
 
 		var denom = Math.abs(1.0 / (xval[edge] - x));
 
 		var sumWeights = 0;
 		var sumX = 0, sumXSquared = 0, sumY = 0, sumXY = 0;
 
 		var k = left;
 		while(k <= right)
 		{
 			var xk = xval[k];
 			var yk = yval[k];
 			var dist;
 			if (k < i) {
 				dist = (x - xk);
 			} else {
 				dist = (xk - x);
 			}
 			var w = tricube(dist * denom);
 			var xkw = xk * w;
 			sumWeights += w;
 			sumX += xkw;
 			sumXSquared += xk * xkw;
 			sumY += yk * w;
 			sumXY += yk * xkw;
 			k++;
 		}
 
 		var meanX = sumX / sumWeights;
 		var meanY = sumY / sumWeights;
 		var meanXY = sumXY / sumWeights;
 		var meanXSquared = sumXSquared / sumWeights;
 
 		var beta;
 		if (meanXSquared == meanX * meanX)
 			beta = 0;
 		else
 			beta = (meanXY - meanX * meanY) / (meanXSquared - meanX * meanX);
 
 		var alpha = meanY - beta * meanX;
 
 		res[i] = beta * x + alpha;
 	}
 
 	return res;
 }

 var margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

 var parseDate = d3.time.format("%d/%m/%Y").parse;

 var formatTime = d3.time.format("%e %B %Y");

 var x = d3.time.scale()
    .range([0, width]);

 var y = d3.scale.linear()
    .range([height, 0]);

 var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

 var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

 var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

 var line = d3.svg.line()
    .interpolate("basis")
    .x(function(d) { return x(d.Date); })
    .y(function(d) { return y(d.Weight); });

 var div = d3.select("body").append("div") 
    .attr("class", "tooltip")       
    .style("opacity", 0);

 d3.csv("https://docs.google.com/spreadsheets/d/e/2PACX-1vSAJC6Bj_1ij2nPZarqpBmHL0xqd3W7iwKi3aqP-rR-Chf0o1QdqqZwBELTd-YaV7_bg4tTO8DXy0C-/pub?gid=1&single=true&output=csv", function(error, data) {
  data.forEach(function(d) {
    d.Date = parseDate(d.Date);
    d.Weight = +d.Weight;
  });

  

  x.domain(d3.extent(data, function(d) { return d.Date; }));
  y.domain(d3.extent(data, function(d) { return d.Weight; }));

  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Weight (kg)");
  
  var lx = [];
  var ly = [];
  
  for (var i = 0; i < data.length; i++) { lx[i] = data[i].Date / 1e12; ly[i] = data[i].Weight; }

  var yOut = loess(lx, ly, 0.2);
    
  var data2 = [];

  for (var i = 0; i < data.length; i++) { data2[i] = {}, data2[i].Date = data[i].Date, data2[i].Weight = yOut[i]; }
    
  svg.append("path")
      .datum(data2)
      .attr("class", "line")
      .attr("d", line);
      
  svg.selectAll("dot")
    .data(data)
    .enter().append("circle")
      .attr("r", 5)
      .attr("cx", function(d) { return x(d.Date); })
      .attr("cy", function(d) { return y(d.Weight); })   
       .on("mouseover", function(d) {   
          div.transition()    
              .duration(200)    
              .style("opacity", .9);    
          div .html(formatTime(d.Date) + "<br/>"  + d.Weight + "kg")  
              .style("left", (d3.event.pageX) + "px")   
              .style("top", (d3.event.pageY - 28) + "px");  
          })          
      .on("mouseout", function(d) {   
          div.transition()    
              .duration(500)    
              .style("opacity", 0); 
      });
 });

 </script>
diff --git a/thumbnail.png b/thumbnail.png
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	body {
	font: 16px sans-serif;
	}

	.axis path,
	.axis line {
	fill: none;
	stroke: #000;
	shape-rendering: crispEdges;
	}

	.x.axis path {
	display: none;
	}

	.line {
	fill: none;
	stroke: steelblue;
	stroke-width: 5px;
	}

	div.tooltip {
	position: absolute;
	text-align: center;
	width: 140px;
	height: 40px;
	padding: 2px;
	font: 16px sans-serif;
	background: lightsteelblue;
	border: 0px;
	border-radius: 8px;
	pointer-events: none;
	}

	</style>
	<body>
	<script src="https://d3js.org/d3.v3.js"></script>
	<script>

	function loess(xval, yval, bandwidth)
	{
	function tricube(x) {
	var tmp = 1 - x * x * x;
	return tmp * tmp * tmp;
	}

	var res = [];

	var left = 0;
	var right = Math.floor(bandwidth * xval.length) - 1;

	for(var i in xval)
	{
	var x = xval[i];

	if (i > 0) {
	if (right < xval.length - 1 &&
	xval[right+1] - xval[i] < xval[i] - xval[left]) {
	left++;
	right++;
	}
	}

	var edge;
	if (xval[i] - xval[left] > xval[right] - xval[i])
	edge = left;
	else
	edge = right;

	var denom = Math.abs(1.0 / (xval[edge] - x));

	var sumWeights = 0;
	var sumX = 0, sumXSquared = 0, sumY = 0, sumXY = 0;

	var k = left;
	while(k <= right)
	{
	var xk = xval[k];
	var yk = yval[k];
	var dist;
	if (k < i) {
	dist = (x - xk);
	} else {
	dist = (xk - x);
	}
	var w = tricube(dist * denom);
	var xkw = xk * w;
	sumWeights += w;
	sumX += xkw;
	sumXSquared += xk * xkw;
	sumY += yk * w;
	sumXY += yk * xkw;
	k++;
	}

	var meanX = sumX / sumWeights;
	var meanY = sumY / sumWeights;
	var meanXY = sumXY / sumWeights;
	var meanXSquared = sumXSquared / sumWeights;

	var beta;
	if (meanXSquared == meanX * meanX)
	beta = 0;
	else
	beta = (meanXY - meanX * meanY) / (meanXSquared - meanX * meanX);

	var alpha = meanY - beta * meanX;

	res[i] = beta * x + alpha;
	}

	return res;
	}

	var margin = {top: 20, right: 20, bottom: 30, left: 50},
	width = 960 - margin.left - margin.right,
	height = 500 - margin.top - margin.bottom;

	var parseDate = d3.time.format("%d/%m/%Y").parse;

	var formatTime = d3.time.format("%e %B %Y");

	var x = d3.time.scale()
	.range([0, width]);

	var y = d3.scale.linear()
	.range([height, 0]);

	var xAxis = d3.svg.axis()
	.scale(x)
	.orient("bottom");

	var yAxis = d3.svg.axis()
	.scale(y)
	.orient("left");

	var svg = d3.select("body").append("svg")
	.attr("width", width + margin.left + margin.right)
	.attr("height", height + margin.top + margin.bottom)
	.append("g")
	.attr("transform", "translate(" + margin.left + "," + margin.top + ")");

	var line = d3.svg.line()
	.interpolate("basis")
	.x(function(d) { return x(d.Date); })
	.y(function(d) { return y(d.Weight); });

	var div = d3.select("body").append("div")
	.attr("class", "tooltip")
	.style("opacity", 0);

	d3.csv("https://docs.google.com/spreadsheets/d/e/2PACX-1vSAJC6Bj_1ij2nPZarqpBmHL0xqd3W7iwKi3aqP-rR-Chf0o1QdqqZwBELTd-YaV7_bg4tTO8DXy0C-/pub?gid=1&single=true&output=csv", function(error, data) {
	data.forEach(function(d) {
	d.Date = parseDate(d.Date);
	d.Weight = +d.Weight;
	});



	x.domain(d3.extent(data, function(d) { return d.Date; }));
	y.domain(d3.extent(data, function(d) { return d.Weight; }));

	svg.append("g")
	.attr("class", "x axis")
	.attr("transform", "translate(0," + height + ")")
	.call(xAxis);

	svg.append("g")
	.attr("class", "y axis")
	.call(yAxis)
	.append("text")
	.attr("transform", "rotate(-90)")
	.attr("y", 6)
	.attr("dy", ".71em")
	.style("text-anchor", "end")
	.text("Weight (kg)");

	var lx = [];
	var ly = [];

	for (var i = 0; i < data.length; i++) { lx[i] = data[i].Date / 1e12; ly[i] = data[i].Weight; }

	var yOut = loess(lx, ly, 0.2);

	var data2 = [];

	for (var i = 0; i < data.length; i++) { data2[i] = {}, data2[i].Date = data[i].Date, data2[i].Weight = yOut[i]; }

	svg.append("path")
	.datum(data2)
	.attr("class", "line")
	.attr("d", line);

	svg.selectAll("dot")
	.data(data)
	.enter().append("circle")
	.attr("r", 5)
	.attr("cx", function(d) { return x(d.Date); })
	.attr("cy", function(d) { return y(d.Weight); })
	.on("mouseover", function(d) {
	div.transition()
	.duration(200)
	.style("opacity", .9);
	div .html(formatTime(d.Date) + "<br/>" + d.Weight + "kg")
	.style("left", (d3.event.pageX) + "px")
	.style("top", (d3.event.pageY - 28) + "px");
	})
	.on("mouseout", function(d) {
	div.transition()
	.duration(500)
	.style("opacity", 0);
	});
	});

	</script>