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Javascript d3 pie chart doesn't pull data from JSON file with list of dictionaries

I have a .json file with data, and I'd like to make a d3 donut (pie) chart from it. I'm not especially fluent in javascript, and every example I can find either pulls from inline json data or the json file is structured differently than mine (mine is a list of dictionaries; theirs are often single dictionaries). I've been troubleshooting for a few days, and somehow can't land on anything that actually works. Any thoughts/tips?
The example at https://www.d3-graph-gallery.com/graph/donut_label.html uses inline json data to render a donut chart with labels. I've attempted to modify it that code by:
pulling json data from /data/all-facet-digitized.json
pull labels each dictionary's "facet" key ("true" and "false"), and values from each dictionary's "count" key (373977 and 55433).
change the color scale domain to match the facet keys ("true" and "false")
/data/all-facet-digitized.json looks like:
[
{
"count": "55433",
"facet": "true"
},
{
"count": "373977",
"facet": "false"
}
]
Code in the of my html file looks like:
<div id="chart"></div> <!-- div containing the donut chart -->
<script src="//d3js.org/d3.v4.min.js"></script>
<script>
// set the dimensions and margins of the graph
var width = 450
height = 450
margin = 40
// The radius of the pieplot is half the width or half the height (smallest one) minus margin.
var radius = Math.min(width, height) / 2 - margin
// append the svg object to the div called 'chart'
var svg = d3.select("#chart")
.append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
// Parse the Data
d3.json("/data/all-facet-digitized.json", function(data) {
// set the color scale
var color = d3.scaleOrdinal()
.domain(["true","false"])
.range(d3.schemeDark2);
// Compute the position of each group on the pie:
var pie = d3.pie()
.sort(null) // Do not sort group by size
.value(function(d) {return d.count; })
var data_ready = pie(d3.entries(data))
// The arc generator
var arc = d3.arc()
.innerRadius(radius * 0.5) // This is the size of the donut hole
.outerRadius(radius * 0.8)
// Another arc that won't be drawn. Just for labels positioning
var outerArc = d3.arc()
.innerRadius(radius * 0.9)
.outerRadius(radius * 0.9)
// Build the pie chart: Basically, each part of the pie is a path that we build using the arc function.
svg
.selectAll('allSlices')
.data(data_ready)
.enter()
.append('path')
.attr('d', arc)
.attr('fill', function(d){ return(color(d.facet)) })
.attr("stroke", "white")
.style("stroke-width", "2px")
.style("opacity", 0.7)
// Add the polylines between chart and labels:
svg
.selectAll('allPolylines')
.data(data_ready)
.enter()
.append('polyline')
.attr("stroke", "black")
.style("fill", "none")
.attr("stroke-width", 1)
.attr('points', function(d) {
var posA = arc.centroid(d) // line insertion in the slice
var posB = outerArc.centroid(d) // line break: we use the other arc generator that has been built only for that
var posC = outerArc.centroid(d); // Label position = almost the same as posB
var midangle = d.startAngle + (d.endAngle - d.startAngle) / 2 // we need the angle to see if the X position will be at the extreme right or extreme left
posC[0] = radius * 0.95 * (midangle < Math.PI ? 1 : -1); // multiply by 1 or -1 to put it on the right or on the left
return [posA, posB, posC]
})
// Add the polylines between chart and labels:
svg
.selectAll('allLabels')
.data(data_ready)
.enter()
.append('text')
.text( function(d) { console.log(d.facet) ; return d.facet} )
.attr('transform', function(d) {
var pos = outerArc.centroid(d);
var midangle = d.startAngle + (d.endAngle - d.startAngle) / 2
pos[0] = radius * 0.99 * (midangle < Math.PI ? 1 : -1);
return 'translate(' + pos + ')';
})
.style('text-anchor', function(d) {
var midangle = d.startAngle + (d.endAngle - d.startAngle) / 2
return (midangle < Math.PI ? 'start' : 'end')
})
})
</script>
My result renders as an empty space:
<div id="chart">
<svg width="450" height="450">
<g transform="translate(225,225)"></g>
</svg>
</div>

The schemeDark2 doens't exist in d3 v4. I've replaced it with schemeCategory10:
var color = d3.scaleOrdinal()
.domain(["true","false"])
.range(d3.schemeCategory10);
Since you have an array of objects, you don't need d3.entries. That takes an object and converts it to an array where each key is an item of the array. But since you already have an array here, you can put it directly in pie():
// Compute the position of each group on the pie:
var pie = d3.pie()
.sort(null) // Do not sort group by size
.value(function(d) {return d.count; })
var data_ready = pie(data)
Now that you've got the data, you can access it on any of the functions: try putting console.log(data_ready) to see what's available. You'll see that the data is bound for each object as the .data property. pie() takes an array and puts it in a format that's convenient to make pie charts with.
Say we want to access the facet property: we would access that as item.data.facet. So in your functions, to access, you can do:
svg
.selectAll('allSlices')
.data(data_ready)
.enter()
.append('path')
.attr('d', arc)
.attr('fill', function(d){ return(color(d.data.facet)) })
<head></head>
<div id="chart"></div> <!-- div containing the donut chart -->
<script src="//d3js.org/d3.v4.min.js"></script>
<script>
// set the dimensions and margins of the graph
var width = 450
height = 450
margin = 40
// The radius of the pieplot is half the width or half the height (smallest one) minus margin.
var radius = Math.min(width, height) / 2 - margin
// append the svg object to the div called 'chart'
var svg = d3.select("#chart")
.append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
// Parse the Data
var data = [
{
"count": "55433",
"facet": "true"
},
{
"count": "373977",
"facet": "false"
}
]
// set the color scale
var color = d3.scaleOrdinal()
.domain(["true","false"])
.range(d3.schemeCategory10);
// Compute the position of each group on the pie:
var pie = d3.pie()
.sort(null) // Do not sort group by size
.value(function(d) {return d.count; })
var data_ready = pie(data)
console.log('data_r', data_ready)
// The arc generator
var arc = d3.arc()
.innerRadius(radius * 0.5) // This is the size of the donut hole
.outerRadius(radius * 0.8)
// Another arc that won't be drawn. Just for labels positioning
var outerArc = d3.arc()
.innerRadius(radius * 0.9)
.outerRadius(radius * 0.9)
// Build the pie chart: Basically, each part of the pie is a path that we build using the arc function.
svg
.selectAll('allSlices')
.data(data_ready)
.enter()
.append('path')
.attr('d', arc)
.attr('fill', function(d){ return(color(d.data.facet)) })
.attr("stroke", "white")
.style("stroke-width", "2px")
.style("opacity", 0.7)
// Add the polylines between chart and labels:
svg
.selectAll('allPolylines')
.data(data_ready)
.enter()
.append('polyline')
.attr("stroke", "black")
.style("fill", "none")
.attr("stroke-width", 1)
.attr('points', function(d) {
var posA = arc.centroid(d) // line insertion in the slice
var posB = outerArc.centroid(d) // line break: we use the other arc generator that has been built only for that
var posC = outerArc.centroid(d); // Label position = almost the same as posB
var midangle = d.startAngle + (d.endAngle - d.startAngle) / 2 // we need the angle to see if the X position will be at the extreme right or extreme left
posC[0] = radius * 0.95 * (midangle < Math.PI ? 1 : -1); // multiply by 1 or -1 to put it on the right or on the left
return [posA, posB, posC]
})
// Add the polylines between chart and labels:
svg
.selectAll('allLabels')
.data(data_ready)
.enter()
.append('text')
.text( function(d) { return d.data.facet} )
.attr('transform', function(d) {
var pos = outerArc.centroid(d);
var midangle = d.startAngle + (d.endAngle - d.startAngle) / 2
pos[0] = radius * 0.99 * (midangle < Math.PI ? 1 : -1);
return 'translate(' + pos + ')';
})
.style('text-anchor', function(d) {
var midangle = d.startAngle + (d.endAngle - d.startAngle) / 2
return (midangle < Math.PI ? 'start' : 'end')
})
</script>

Ok, the issues here is that you've completely missed how data_ready is structured after converting the JSON response. You might want to add console.log(data_ready) just after you set data_ready and inspect it in the console for better understanding of the following fixes.
First a color fix:
.attr('fill', function(d){ return(color(d.data.value.facet)) })
Then a data fix:
.value(function(d) {return d.value.count; })
And lastly a label fix:
.text( function(d) { console.log(d.data.key) ; return d.data.value.facet } )
Your script should look like this:
// set the dimensions and margins of the graph
var width = 450
height = 450
margin = 40
// The radius of the pieplot is half the width or half the height (smallest one). I subtract a bit of margin.
var radius = Math.min(width, height) / 2 - margin
// append the svg object to the div called 'my_dataviz'
var svg = d3.select("#chart")
.append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
d3.json("/data/all-facet-digitized.json", function(data) {
// set the color scale
var color = d3.scaleOrdinal()
.domain(["true","false"])
.range(d3.schemeDark2);
// Compute the position of each group on the pie:
var pie = d3.pie()
.sort(null) // Do not sort group by size
.value(function(d) {return d.value.count; })
var data_ready = pie(d3.entries(data))
// The arc generator
var arc = d3.arc()
.innerRadius(radius * 0.5) // This is the size of the donut hole
.outerRadius(radius * 0.8)
// Another arc that won't be drawn. Just for labels positioning
var outerArc = d3.arc()
.innerRadius(radius * 0.9)
.outerRadius(radius * 0.9)
// Build the pie chart: Basically, each part of the pie is a path that we build using the arc function.
svg
.selectAll('allSlices')
.data(data_ready)
.enter()
.append('path')
.attr('d', arc)
.attr('fill', function(d){ return(color(d.data.value.facet)) })
.attr("stroke", "white")
.style("stroke-width", "2px")
.style("opacity", 0.7)
// Add the polylines between chart and labels:
svg
.selectAll('allPolylines')
.data(data_ready)
.enter()
.append('polyline')
.attr("stroke", "black")
.style("fill", "none")
.attr("stroke-width", 1)
.attr('points', function(d) {
var posA = arc.centroid(d) // line insertion in the slice
var posB = outerArc.centroid(d) // line break: we use the other arc generator that has been built only for that
var posC = outerArc.centroid(d); // Label position = almost the same as posB
var midangle = d.startAngle + (d.endAngle - d.startAngle) / 2 // we need the angle to see if the X position will be at the extreme right or extreme left
posC[0] = radius * 0.95 * (midangle < Math.PI ? 1 : -1); // multiply by 1 or -1 to put it on the right or on the left
return [posA, posB, posC]
})
// Add the polylines between chart and labels:
svg
.selectAll('allLabels')
.data(data_ready)
.enter()
.append('text')
.text( function(d) { console.log(d.data.key) ; return d.data.value.facet } )
.attr('transform', function(d) {
var pos = outerArc.centroid(d);
var midangle = d.startAngle + (d.endAngle - d.startAngle) / 2
pos[0] = radius * 0.99 * (midangle < Math.PI ? 1 : -1);
return 'translate(' + pos + ')';
})
.style('text-anchor', function(d) {
var midangle = d.startAngle + (d.endAngle - d.startAngle) / 2
return (midangle < Math.PI ? 'start' : 'end')
})
})

d3js : how to put circles at the end of an arc

I'm trying to create a donut chart in d3js where each arc has a circle at its end.
Circle's edge must fit on arc's one.
I tried both by appending a circle and a circle wrapped in marker but with no succes.
Trying to append a marker seems to be the closest solution to the desired one but I can't help the marker oveflowing the arc edges.
Code:
var data = [
{
name: "punti",
count: 3,
color: "#fff000"
},
{
name: "max",
count: 7,
color: "#f8b70a"
}
];
var totalCount = data.reduce((acc, el) => el.count + acc, 0);
var image_width = 32;
var image_height = 32;
var width = 540,
height = 540,
radius = 200,
outerRadius = radius - 10,
innerRadius = 100;
var cornerRadius = innerRadius;
var markerRadius = (outerRadius - innerRadius) / 2;
var arc = d3
.arc()
.outerRadius(outerRadius)
.innerRadius(innerRadius)
.cornerRadius(cornerRadius);
var pie = d3
.pie()
.sort(null)
.value(function(d) {
return d.count;
});
var svg = d3
.select("body")
.append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
var pieData = pie(data);
var g = svg
.selectAll(".arc")
.data(pieData)
.enter()
.append("g");
var path = g
.append("path")
.attr("d", arc)
.style("fill", function(d, i) {
return d.data.color;
});
var marker = svg
.append("defs")
.append("marker")
.attr("id", "endmarker")
.attr("overflow", "visible")
.append("circle")
.attr("cy", 0)
.attr("cx", 0)
.attr("r", markerRadius)
.attr("fill", "red");
g.attr("marker-end", "url(#endmarker)");
g
.append("circle")
.attr("cx", function(d) {
let path = d3.select(this.parentNode);
var x = arc.centroid(d)[0];
return x;
})
.attr("cy", function(d) {
var y = arc.centroid(d)[1];
console.log(d3.select(this).attr("cx"));
return y;
})
.attr("fill", d => d.data.color)
.attr("stroke", "black")
.attr("r", (outerRadius - innerRadius) / 2);
codepen here
Thanks to anyone who will help!

Assuming that you want your output like:
I found some code from Mike Bostock's Block here which shows how to add circles to rounded Arc Corners.
I adapted the following code for you which performs quite a bit of complex mathematics.
var cornerRadius = (outerRadius - innerRadius)/2;
svg.append("g")
.style("stroke", "#555")
.style("fill", "none")
.attr("class", "corner")
.selectAll("circle")
.data(d3.merge(pieData.map(function(d) {
return [
{angle: d.startAngle + d.padAngle / 2, radius: outerRadius - cornerRadius, start: +1},
{angle: d.endAngle - d.padAngle / 2, radius: outerRadius - cornerRadius, start: -1},
];
})))
.enter().append("circle")
.attr("cx", function(d) { return d.start * cornerRadius * Math.cos(d.angle) + Math.sqrt(d.radius * d.radius - cornerRadius * cornerRadius) * Math.sin(d.angle); })
.attr("cy", function(d) { return d.start * cornerRadius * Math.sin(d.angle) - Math.sqrt(d.radius * d.radius - cornerRadius * cornerRadius) * Math.cos(d.angle); })
.attr("r", cornerRadius);
Full snippet showing the output:
<div id="chart"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.12.0/d3.min.js"></script>
<script>
var data = [
{
name: "punti",
count: 3,
color: "#fff000"
},
{
name: "max",
count: 7,
color: "#f8b70a"
},
];
var totalCount = data.reduce((acc, el) => el.count + acc, 0);
var image_width = 32;
var image_height = 32;
var width = 540,
height = 540,
radius = 200,
outerRadius = radius - 10,
innerRadius = 100;
var cornerRadius = innerRadius;
var markerRadius = (outerRadius - innerRadius) / 2;
var arc = d3
.arc()
.outerRadius(outerRadius)
.innerRadius(innerRadius)
.cornerRadius(cornerRadius);
var pie = d3
.pie()
.sort(null)
.value(function(d) {
return d.count;
});
var svg = d3
.select("body")
.append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
var pieData = pie(data);
var g = svg
.selectAll(".arc")
.data(pieData)
.enter()
.append("g");
var path = g
.append("path")
.attr("d", arc)
.style("fill", function(d, i) {
return d.data.color;
});
var cornerRadius = (outerRadius - innerRadius)/2;
svg.append("g")
.style("stroke", "#555")
.style("fill", "none")
.attr("class", "corner")
.selectAll("circle")
.data(d3.merge(pieData.map(function(d) {
return [
{angle: d.startAngle + d.padAngle / 2, radius: outerRadius - cornerRadius, start: +1},
{angle: d.endAngle - d.padAngle / 2, radius: outerRadius - cornerRadius, start: -1},
];
})))
.enter().append("circle")
.attr("cx", function(d) { return d.start * cornerRadius * Math.cos(d.angle) + Math.sqrt(d.radius * d.radius - cornerRadius * cornerRadius) * Math.sin(d.angle); })
.attr("cy", function(d) { return d.start * cornerRadius * Math.sin(d.angle) - Math.sqrt(d.radius * d.radius - cornerRadius * cornerRadius) * Math.cos(d.angle); })
.attr("r", cornerRadius);
</script>

Round One Side of D3 Arc

I'm using D3.js's built-in arc function to generate SVG <path>s for my data.
.attr("d", function(element, index) {
var arc = d3.arc()
.innerRadius(iR)
.outerRadius(iR + 10)
.startAngle(element[1])
.endAngle(element[2])
.cornerRadius(isRounded ? cR : 0);
return arc();
});
This works perfectly, but I'd like to round one side (both corners) of certain arcs. When a corner radius is supplied with .cornerRadius(), however, it rounds all four corners.
I know there are various ways to selectively round the corners of rectangles, but I'm hoping there's some generic way to do this for arcs.
I also saw this question about rounding only some corners of an arc, but it has no answer (and D3 v4 has come out since it was posted).

Even with the v4 API, still no straight-forward way to do this. Looking at the source code, the cornerRadius becomes a fixed value for the calculation of the whole arc (all 4 corners). Easiest fix is to just append two arcs for every data point with the 2nd arc just filling in the corners.
Example, say we have this nicely rounded arcs:
var myArcs = [
[0, 45],
[180, 300]
];
var vis = d3.select('body')
.append('svg')
.attr('width', 400)
.attr('height', 400);
var arc = d3.arc()
.innerRadius(80)
.outerRadius(150)
var someArcs = vis.selectAll('path')
.data(myArcs)
.enter();
someArcs
.append("path")
.attr("transform", "translate(200,200)")
.attr("d", function(d) {
arc.startAngle(d[0] * (Math.PI / 180))
.endAngle(d[1] * (Math.PI / 180))
.cornerRadius(20);
return arc();
})
.attr("fill", function(d, i) {
return d3.schemeCategory10[i];
});
<script data-require="d3#4.0.0" data-semver="4.0.0" src="https://d3js.org/d3.v4.min.js"></script>
My fix would look like:
var myArcs = [
[0, 45],
[180, 300]
];
var vis = d3.select('body')
.append('svg')
.attr('width', 400)
.attr('height', 400);
var arc = d3.arc()
.innerRadius(80)
.outerRadius(150)
var someArcs = vis.selectAll('path')
.data(myArcs)
.enter();
someArcs
.append("path")
.attr("transform", "translate(200,200)")
.attr("d", function(d) {
arc.startAngle(d[0] * (Math.PI / 180))
.endAngle(d[1] * (Math.PI / 180))
.cornerRadius(20);
return arc();
})
.attr("fill", function(d, i) {
return d3.schemeCategory10[i];
});
someArcs
.append("path")
.attr("transform", "translate(200,200)")
.attr("d", function(d) {
arc.startAngle(d[0] * (Math.PI / 180))
.endAngle((d[0] + 10) * (Math.PI / 180))
.cornerRadius(0);
return arc();
})
.attr("fill", function(d, i) {
return d3.schemeCategory10[i];
});
<script data-require="d3#4.0.0" data-semver="4.0.0" src="https://d3js.org/d3.v4.min.js"></script>

d3 graticule with fill color?

I am trying to display a grid on a world map where each grid cell is filled with a color based on some data (e.g., temperature or humidity). I am trying to adapt the simple world map example here: http://techslides.com/demos/d3/d3-worldmap-boilerplate.html
I thought I might be able to use the built-in d3 graticule and add a fill color, like this:
g.append("path")
.datum(graticule)
.attr("class", "graticule")
.attr("d", path)
.style("fill", function(d, i) { return color(Math.floor((Math.random() * 20) + 1)); });
That doesn't work, though. Is there a way to fill in the grid cells generated by graticule? If not, what's the best way to go about overlaying a lat,long grid on the map with filled cells?

I created d3-grid-map to solve a specific problem of placing sparse global 0.5 degree grid cells on a d3 map by drawing on canvas layers. It should support other grid sizes with some effort. It handles a couple of forms of javascript typed array inputs, but it could use more generalization.

To do something like this, first create data set with all the N/S/E/W to define the limits.
var data set = [{W: -5.0, N: 50.0, E: 10.0, S: 40.0 }, {W: -95.0, N: 50.0, E: -40.0, S: 40.0 }];
Next post you load your world JSON add the path like this.
d3.json("http://techslides.com/demos/d3/data/world-topo.json", function(error, world) {
var countries = topojson.feature(world, world.objects.countries).features;
topo = countries;
draw(topo);
//iterate over the dataset created above for making paths.
dataset.forEach(function(bb){
var arc = d3.geo.graticule()
.majorExtent([[bb.W, bb.S], [bb.E, bb.N]])
//this will append the path to the g group so that it moves accordingly on translate/zoom
g.append("path")
.attr("class", "arc")
.attr("d", path(arc.outline()));
});
});
On Css add:
.arc {
fill: red;[![enter image description here][1]][1]
fill-opacity: 0.3;
stroke: black;
stroke-opacity: 0.5;
}
Full JS here:
d3.select(window).on("resize", throttle);
var zoom = d3.behavior.zoom()
.scaleExtent([1, 8])
.on("zoom", move);
var width = document.getElementById('container').offsetWidth-60;
var height = width / 2;
var dataset = [{W: -5.0, N: 50.0, E: 10.0, S: 40.0 }, {W: -95.0, N: 50.0, E: -40.0, S: 40.0 }];
var topo,projection,path,svg,g;
var tooltip = d3.select("#container").append("div").attr("class", "tooltip hidden");
setup(width,height);
function setup(width,height){
projection = d3.geo.mercator()
.translate([0, 0])
.scale(width / 2 / Math.PI);
path = d3.geo.path()
.projection(projection);
svg = d3.select("#container").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")")
.call(zoom);
g = svg.append("g");
}
d3.json("http://techslides.com/demos/d3/data/world-topo.json", function(error, world) {
var countries = topojson.feature(world, world.objects.countries).features;
topo = countries;
draw(topo);
dataset.forEach(function(bb){
var arc = d3.geo.graticule()
.majorExtent([[bb.W, bb.S], [bb.E, bb.N]])
g.append("path")
.attr("class", "arc")
.attr("d", path(arc.outline()));
});
});
function draw(topo) {
var country = g.selectAll(".country").data(topo);
country.enter().insert("path")
.attr("class", "country")
.attr("d", path)
.attr("id", function(d,i) { return d.id; })
.attr("title", function(d,i) { return d.properties.name; })
.style("fill", function(d, i) { return d.properties.color; });
//ofsets plus width/height of transform, plsu 20 px of padding, plus 20 extra for tooltip offset off mouse
var offsetL = document.getElementById('container').offsetLeft+(width/2)+40;
var offsetT =document.getElementById('container').offsetTop+(height/2)+20;
//tooltips
country
.on("mousemove", function(d,i) {
var mouse = d3.mouse(svg.node()).map( function(d) { return parseInt(d); } );
tooltip
.classed("hidden", false)
.attr("style", "left:"+(mouse[0]+offsetL)+"px;top:"+(mouse[1]+offsetT)+"px")
.html(d.properties.name)
})
.on("mouseout", function(d,i) {
tooltip.classed("hidden", true)
});
}
function redraw() {
width = document.getElementById('container').offsetWidth-60;
height = width / 2;
d3.select('svg').remove();
setup(width,height);
draw(topo);
}
function move() {
var t = d3.event.translate;
var s = d3.event.scale;
var h = height / 3;
t[0] = Math.min(width / 2 * (s - 1), Math.max(width / 2 * (1 - s), t[0]));
t[1] = Math.min(height / 2 * (s - 1) + h * s, Math.max(height / 2 * (1 - s) - h * s, t[1]));
zoom.translate(t);
g.style("stroke-width", 1 / s).attr("transform", "translate(" + t + ")scale(" + s + ")");
}
var throttleTimer;
function throttle() {
window.clearTimeout(throttleTimer);
throttleTimer = window.setTimeout(function() {
redraw();
}, 200);
}
Image:

Trying to incorporate svg circle within a d3 donut

I am trying to add a SVG circle within my d3 donut. My SVG circle displays the percentage as a fill of circle, for example, if the D3 donut is at 50%, the SVG will show 50% filled. I want to put the SVG circle within the inside of my D3 donut.
Here is my codepen for this. http://codepen.io/iamsok/pen/MwdPpx
class ProgressWheel {
constructor(patient, steps, container){
this._patient = patient;
this._steps = steps;
this.$container = $(container);
var τ = 2 * Math.PI,
width = this.$container.width(),
height = this.$container.height(),
innerRadius = Math.min(width,height)/4,
//innerRadius = (outerRadius/4)*3,
fontSize = (Math.min(width,height)/4);
var tooltip = d3.select(".tooltip");
var status = {
haveNot: 0,
taken: 1,
ignored: 2
}
var daysProgress = patient.progress
var percentComplete = Math.round(_.countBy(daysProgress)[status.taken] / daysProgress.length * 100);
var participation = 100;
var color = ["#CCC", "#FDAD42", "#EFD8B5"];
var pie = d3.layout.pie()
.value(function(d) { return 1; })
.sort(null);
var arc = d3.svg.arc();
var svg = d3.select(container).append("svg")
.attr("width", '100%')
.attr("height", '100%')
.attr('viewBox','0 0 '+Math.min(width,height) +' '+Math.min(width,height) )
.attr('preserveAspectRatio','xMinYMin')
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
var innerCircle = d3.select("svg")
.append("svg")
.attr("width", 250)
.attr("height", 250);
var grad = innerCircle.append("defs")
.append("linearGradient").attr("id", "grad")
.attr("x1", "0%").attr("x2", "0%").attr("y1", "100%").attr("y2", "0%");
grad.append("stop").attr("offset", percentComplete + "%").style("stop-color", "lightblue");
grad.append("stop").attr("offset", percentComplete + "%").style("stop-color", "white");
innerCircle.append("circle")
.attr("r", 40)
.attr("cx", 70)
.attr("cy", 70)
.style("stroke", "black")
.style("fill", "url(#grad)");
var gs = svg.selectAll(".arc")
.data(pie(daysProgress))
.enter().append("g")
.attr("class", "arc");
var path = gs.append("path")
.attr("fill", function(d, i) { return color[d.data]; })
.attr("d", function(d, i, j) { return arc.innerRadius(innerRadius+(20*j)).outerRadius(innerRadius+20+(20*j))(d); })
.attr("class", function(d, i, j) { if (i>=participation && j<1) return "passed" ; })
svg.append("text")
.attr("dy", "0.5em")
.style("text-anchor", "middle")
.attr("class", "inner-circle")
.attr("fill", "#36454f")
.text(Math.round(_.countBy(daysProgress)[status.taken] / daysProgress.length * 100) + "%");
}
}
var patient = {progress: [0, 2, 2, 1, 0, 0, 0, 1, 1, 0, 1, 1, 2, 2]}
var progressWheel = new ProgressWheel(patient, 14, '.chart-container' )

Simply put the d3 donut and inner circle under the same svg so that they have the same coordinate system.
Check out here http://codepen.io/anon/pen/ojbQNE
Modified code is on codepen