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d3.js - How to stylize a pie chart - javascript

I have the following pie chart:
var data = [12,44,44];
var width = 300,
height = 300,
radius = Math.min(width, height) / 2;
var color = d3.scale.category20();
var pie = d3.layout.pie()
.sort(null);
var piedata = pie(data);
var arc = d3.svg.arc()
.innerRadius(radius - 100)
.outerRadius(radius - 50);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
var path = svg.selectAll("path")
.data(piedata)
.enter().append("path")
.attr("d", arc);
svg.selectAll("text").data(piedata)
.enter()
.append("text")
.attr("text-anchor", "middle")
.attr("x", function(d) {
var a = d.startAngle + (d.endAngle - d.startAngle)/2 - Math.PI/2;
d.cx = Math.cos(a) * (radius - 75);
return d.x = Math.cos(a) * (radius - 30);
})
.attr("y", function(d) {
var a = d.startAngle + (d.endAngle - d.startAngle)/2 - Math.PI/2;
d.cy = Math.sin(a) * (radius - 75);
return d.y = Math.sin(a) * (radius - 30);
})
.text(function(d) { return d.value + '%'; });
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
margin: auto;
position: relative;
width: 960px;
}
text {
font: 12px sans-serif;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
The chart data is passed through an array, but how can I pass the color to be used by the chat through the array?
This is my actual array:
var data = [12,44,44];
But I would like to pass the color of items like this:
var data = [
{
color: 'red',
value: 12
},
{
color: 'blue',
value: 44
},
{
color: 'green',
value: 44
}
];
How do I implement my code to achieve the result below?

Given the data structure in your question...
var data = [
{
color: 'red',
value: 12
},
{
color: 'blue',
value: 44
},
{
color: 'green',
value: 44
}
];
... you'll have to, firstly, tell the pie generator the correct property:
var pie = d3.layout.pie()
.value(function(d) {
return d.value
})
.sort(null);
That being done, this is the important part: set the fill of the paths using the color property, that the pie generator puts under the data object:
.style("fill", function(d) {
return d.data.color
})
Here is your code with those changes:
var data = [{
color: 'red',
value: 12
},
{
color: 'blue',
value: 44
},
{
color: 'green',
value: 44
}
];
var width = 300,
height = 300,
radius = Math.min(width, height) / 2;
var color = d3.scale.category20();
var pie = d3.layout.pie()
.value(function(d) {
return d.value
})
.sort(null);
var piedata = pie(data);
var arc = d3.svg.arc()
.innerRadius(radius - 100)
.outerRadius(radius - 50);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
var path = svg.selectAll("path")
.data(piedata)
.enter().append("path")
.style("fill", function(d) {
return d.data.color
})
.attr("d", arc);
svg.selectAll("text").data(piedata)
.enter()
.append("text")
.attr("text-anchor", "middle")
.attr("x", function(d) {
var a = d.startAngle + (d.endAngle - d.startAngle) / 2 - Math.PI / 2;
d.cx = Math.cos(a) * (radius - 75);
return d.x = Math.cos(a) * (radius - 30);
})
.attr("y", function(d) {
var a = d.startAngle + (d.endAngle - d.startAngle) / 2 - Math.PI / 2;
d.cy = Math.sin(a) * (radius - 75);
return d.y = Math.sin(a) * (radius - 30);
})
.text(function(d) {
return d.value + '%';
});
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
margin: auto;
position: relative;
width: 960px;
}
text {
font: 12px sans-serif;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>

Try this. I think it will give you the answer.
var colorScale = d3.scale.ordinal().domain(["banana", "cherry", "blueberry"])
.range(["#eeff00", "#ff0022", "#2200ff"]);
pie.colors(function(d){ return colorScale(d.fruitType); });
or you can directly give
var colorScale = d3.scale.ordinal().range([/*array of hex values */]);
pie.colors(colorScale);

Related

I found this working example how to create a polar plot with D3. What I can not figure out is how to add labels (compass labels like N, E, S , W) to the principal axes outside of the plot.
Also scale labels for the distance from the radius inside the plot. All I do is end up overlapping and rotated into seems arbitrary directions.

I'd just create a dummy data structure, with the key being the name, and the value being the angle I want it at. Then use some basic trigonometry to position the nodes correctly.
var width = 960,
height = 500,
radius = Math.min(width, height) / 2 - 30;
var r = d3.scale.linear()
.domain([0, 1])
.range([0, radius]);
var line = d3.svg.line.radial()
.radius(function(d) {
return r(d[1]);
})
.angle(function(d) {
return -d[0] + Math.PI / 2;
});
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
var gr = svg.append("g")
.attr("class", "r axis")
.selectAll("g")
.data(r.ticks(3).slice(1))
.enter().append("g");
gr.append("circle")
.attr("r", r);
var ga = svg.append("g")
.attr("class", "a axis")
.selectAll("g")
.data(d3.range(0, 360, 30))
.enter().append("g")
.attr("transform", function(d) {
return "rotate(" + -d + ")";
});
ga.append("line")
.attr("x2", radius);
var color = d3.scale.category20();
var line = d3.svg.line.radial()
.radius(function(d) {
return r(d[1]);
})
.angle(function(d) {
return -d[0] + Math.PI / 2;
});
var data = [
[Math.PI / 3, Math.random()],
[Math.PI / 6, Math.random()],
[0 * Math.PI, Math.random()],
[(11 * Math.PI) / 6, Math.random()],
[(5 * Math.PI / 3), Math.random()],
[(3 * Math.PI) / 2, Math.random()],
[(4 * Math.PI / 3), Math.random()],
[(7 * Math.PI) / 6, Math.random()],
[Math.PI, Math.random()],
[(5 * Math.PI) / 6, Math.random()],
[(2 * Math.PI) / 3, Math.random()],
[Math.PI / 2, Math.random()]
];
var angles = {
N: 0,
E: Math.PI / 2,
S: Math.PI,
W: 3 * Math.PI / 2,
};
svg.selectAll("point")
.data(data)
.enter()
.append("circle")
.attr("class", "point")
.attr("transform", function(d) {
var coors = line([d]).slice(1).slice(0, -1);
return "translate(" + coors + ")"
})
.attr("r", 8)
.attr("fill", function(d, i) {
return color(i);
});
svg.selectAll(".angle")
.data(Object.keys(angles))
.enter()
.append("text")
.attr("class", "angle")
.attr("text-anchor", "middle")
.attr("dominant-baseline", "middle")
.attr("transform", function(d) {
// Subtract because 0degrees is up at (0, 1) on the unit circle, but
// 0 radians is to the right, at (1, 0)
var angle = angles[d] - Math.PI / 2;
var textRadius = radius + 20;
var x = Math.cos(angle) * textRadius;
var y = Math.sin(angle) * textRadius;
return "translate(" + [x, y] + ")";
})
.text(function(d) { return d; })
.frame {
fill: none;
stroke: #000;
}
.axis text {
font: 10px sans-serif;
}
.axis line,
.axis circle {
fill: none;
stroke: steelblue;
stroke-dasharray: 4;
}
.axis:last-of-type circle {
stroke: steelblue;
stroke-dasharray: none;
}
.line {
fill: none;
stroke: orange;
stroke-width: 3px;
}
<script src="//d3js.org/d3.v3.min.js"></script>

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>

I just managed to convert the respective heatmap from SVG to canvas. (due to large dataset vs performance issue) However the position of the generated heatmap has goes to a new region. I not sure how am I going to do about this. By changing the transform does not change anything as well.
My code:
var units = [];
for(var unit_i = 0; unit_i<=101;){
if(unit_i==0){
units.push(1);
unit_i = unit_i + 5;
}
else{
units.push(unit_i);
unit_i = unit_i + 4;
}
}
var times = [];
for(var times_i = 0; times_i<=1440;){
if(times_i==0){
times.push(1);
times_i = times_i + 10;
}
else{
times.push(times_i);
times_i = times_i + 9;
}
}
var newSample = [{unit:null, timestamp: null, level: null}];
//by using below method we can observe the delay is not due to the data during insertion
for(var unit=1; unit<=99; unit++){
for(var timestamp = 1; timestamp<=100; timestamp++){
var i = Math.random() * 1400;
newSample.push({unit:unit, timestamp: timestamp, level:i});
}
}
var hours = 0;
var hoursIndicator = 0;
var margin = {
top: 170,
right: 100,
bottom: 70,
left: 100
};
var width = 2500,//optimized width
//gridSize = Math.floor(width / times.length),//optimized gridsize
gridSize = 10;//if 20 each interval will have 5
height = 50 * (units.length); //optimized, the greater the length, the greater the height
console.log("this is gridSize:" + gridSize +", this is height: " + height + ", and this is width: " + width);
//SVG container
var svg = d3.select('.trafficCongestions')
.append("svg")
//.style("position", "absolute")
.attr("width", width + margin.left + margin.right)//optimization
.attr("height", height + margin.top + margin.bottom)//optimization
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var canvas = d3.select('.trafficCongestions').append("canvas")
.attr("id", "canvas")
.attr("width", width + margin.left + margin.right)//optimization
.attr("height", height + margin.top + margin.bottom);//optimization
var context = canvas.node().getContext("2d");
context.clearRect(0, 0, width, height);
var detachedContainer = document.createElement("custom");
var dataContainer = d3.select(detachedContainer);
//Reset the overall font size
var newFontSize = width * 62.5 / 900;
//heatmap drawing starts from here
var colorScale = d3.scaleLinear()
.domain([0, d3.max(newSample, function(d, i) {return d.level; })/2, d3.max(newSample, function(d, i) {return d.level; })])
.range(["#009933", "#FFCC00", "#990000"])//obtain the max data value of count
//y-axis (solely based on data of days)
var dayLabels = svg.selectAll(".dayLabel")
.data(units)
.enter().append("text")
.text(function (d) { return d; })
.attr("x", 0)
.attr("y", function (d, i) {
return (i) * (gridSize * 4)/*adjusts the interval distance with (n - 1) concept*/; })
.style("text-anchor", "end")
.attr("transform", "translate(-6," + gridSize + ")");
//x-axis (solely based on data of times)
var timeLabels = svg.selectAll(".timeLabel")
.data(times)
.enter().append("text")
.text(function(d, i) {
var hrs = Math.floor(d/60);
var mins = d%60;
if(hrs<10){
if(mins<10){
return "0"+hrs + ":0" + mins;
}
return "0"+ hrs + ":" + mins;
}
return hrs +":"+ mins;
})
.attr("x", function(d, i) { return i * (gridSize * 9)/*adjusts the interval distance with (n - 1) concept*/; })
.attr("y", 0)
.style("text-anchor", "middle")
.attr("transform", "translate(" + 1 + ", -6)")
var heatMap = dataContainer.selectAll("custom.rect")
.data(newSample)
.enter().append("custom")
.attr("x", function(d) {
return (d.timestamp - 1) * (gridSize);
})
.attr("y", function(d) {
console.log(d.unit);
return (d.unit - 1) * (gridSize);
})
.classed("rect", true)
.attr("class", " rect bordered")
.attr("width", gridSize)
.attr("height", gridSize)
.attr("strokeStyle", "rgba(255,255,255, 0.6)")//to have the middle line or not
.attr("fillStyle", function(d,i){
return colorScale(d.level);
});
drawCanvas();
//Append title to the top
svg.append("text")
.attr("class", "title")
.attr("x", width/2)
.attr("y", -90)
.style("text-anchor", "middle")
.text("Sample Result");
svg.append("text")
.attr("class", "subtitle")
.attr("x", width/2)
.attr("y", -60)
.style("text-anchor", "middle")
.text("HEATMAP");
//Append credit at bottom
svg.append("text")
.attr("class", "credit")
.attr("x", width/2)
.attr("y", gridSize * (units.length+1) + 80)
.style("text-anchor", "middle");
//Extra scale since the color scale is interpolated
var countScale = d3.scaleLinear()
.domain([0, d3.max(newSample, function(d) {return d.level; })])
.range([0, width])
//Calculate the variables for the temp gradient
var numStops = 10;
countRange = countScale.domain();
countRange[2] = countRange[1] - countRange[0];
countPoint = [];
for(var i = 0; i < numStops; i++) {
countPoint.push(i * countRange[2]/(numStops-1) + countRange[0]);
}//for i
//Create the gradient
svg.append("defs")
.append("linearGradient")
.attr("id", "legendLevel")
.attr("x1", "0%").attr("y1", "0%")
.attr("x2", "100%").attr("y2", "0%")
.selectAll("stop")
.data(d3.range(numStops))
.enter().append("stop")
.attr("offset", function(d,i) {
return countScale( countPoint[i] )/width;
})
.attr("stop-color", function(d,i) {
return colorScale( countPoint[i] );
});
var legendWidth = Math.min(width, 400);//the width of the legend
console.log(width);
//Color Legend container
var legendsvg = svg.append("g")
.attr("class", "legendWrapper")
.attr("transform", "translate(" + (width/2) + "," + (gridSize * 100 + 40) + ")");
//Draw the Rectangle
legendsvg.append("rect")
.attr("class", "legendRect")
.attr("x", -legendWidth/2)
.attr("y", 0)
.attr("width", legendWidth)
.attr("height", 10)
.style("fill", "url(#legendLevel)");
//Append title
legendsvg.append("text")
.attr("class", "legendTitle")
.attr("x", 0)
.attr("y", -10)
.style("text-anchor", "middle")
.text("Level");
//Set scale for x-axis
var xScale = d3.scaleLinear()
.range([-legendWidth/2, legendWidth/2])
.domain([ 0, d3.max(newSample, function(d) { return d.level; })] );
//Define x-axis
var xAxis = d3.axisBottom()
.ticks(5)
.scale(xScale);
//Set up X axis
legendsvg.append("g")
.attr("class", "axis")
.attr("transform", "translate(0," + (10) + ")")
.call(xAxis);
function drawCanvas(){
var elements = dataContainer.selectAll("custom.rect");
elements.each(function(d){
var node = d3.select(this);
context.beginPath();
context.fillStyle = node.attr("fillStyle");
context.rect(node.attr("x"), node.attr("y"), node.attr("width"), node.attr("height"));
context.fill();
context.closePath();
});
}
html { font-size: 100%; }
.timeLabel, .dayLabel {
font-size: 1rem;
fill: #AAAAAA;
font-weight: 300;
}
.title {
font-size: 1.8rem;
fill: #4F4F4F;
font-weight: 300;
}
.subtitle {
font-size: 1.0rem;
fill: #AAAAAA;
font-weight: 300;
}
.credit {
font-size: 1.2rem;
fill: #AAAAAA;
font-weight: 400;
}
.axis path, .axis tick, .axis line {
fill: none;
stroke: none;
}
.legendTitle {
font-size: 1.3rem;
fill: #4F4F4F;
font-weight: 300;
<script src="https://d3js.org/d3.v4.min.js"></script>
<div id="trafficCongestions" class="trafficCongestions"></div>

As you're using svg to just show up the text and legend, I'd say you can absolute position the canvas on top of the SVG - by CSS.
Here are the CSS changes:
div#trafficCongestions {
position: relative;
}
canvas {
position: absolute;
top: 170px;
left: 100px;
}
You can do the above using d3 style as well `cause the margins are defined in the script. I just wanted to show that this is an option to use.
var units = [];
for(var unit_i = 0; unit_i<=101;){
if(unit_i==0){
units.push(1);
unit_i = unit_i + 5;
}
else{
units.push(unit_i);
unit_i = unit_i + 4;
}
}
var times = [];
for(var times_i = 0; times_i<=1440;){
if(times_i==0){
times.push(1);
times_i = times_i + 10;
}
else{
times.push(times_i);
times_i = times_i + 9;
}
}
var newSample = [{unit:null, timestamp: null, level: null}];
//by using below method we can observe the delay is not due to the data during insertion
for(var unit=1; unit<=99; unit++){
for(var timestamp = 1; timestamp<=100; timestamp++){
var i = Math.random() * 1400;
newSample.push({unit:unit, timestamp: timestamp, level:i});
}
}
var hours = 0;
var hoursIndicator = 0;
var margin = {
top: 170,
right: 100,
bottom: 70,
left: 100
};
var width = 2500,//optimized width
//gridSize = Math.floor(width / times.length),//optimized gridsize
gridSize = 10;//if 20 each interval will have 5
height = 50 * (units.length); //optimized, the greater the length, the greater the height
//console.log("this is gridSize:" + gridSize +", this is height: " + height + ", and this is width: " + width);
//SVG container
var svg = d3.select('.trafficCongestions')
.append("svg")
//.style("position", "absolute")
.attr("width", width + margin.left + margin.right)//optimization
.attr("height", height + margin.top + margin.bottom)//optimization
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
var canvas = d3.select('.trafficCongestions').append("canvas")
.attr("id", "canvas")
.attr("width", width + margin.left + margin.right)//optimization
.attr("height", height + margin.top + margin.bottom);//optimization
var context = canvas.node().getContext("2d");
context.clearRect(0, 0, width, height);
var detachedContainer = document.createElement("custom");
var dataContainer = d3.select(detachedContainer);
//Reset the overall font size
var newFontSize = width * 62.5 / 900;
//heatmap drawing starts from here
var colorScale = d3.scaleLinear()
.domain([0, d3.max(newSample, function(d, i) {return d.level; })/2, d3.max(newSample, function(d, i) {return d.level; })])
.range(["#009933", "#FFCC00", "#990000"])//obtain the max data value of count
//y-axis (solely based on data of days)
var dayLabels = svg.selectAll(".dayLabel")
.data(units)
.enter().append("text")
.text(function (d) { return d; })
.attr("x", 0)
.attr("y", function (d, i) {
return (i) * (gridSize * 4)/*adjusts the interval distance with (n - 1) concept*/; })
.style("text-anchor", "end")
.attr("transform", "translate(-6," + gridSize + ")");
//x-axis (solely based on data of times)
var timeLabels = svg.selectAll(".timeLabel")
.data(times)
.enter().append("text")
.text(function(d, i) {
var hrs = Math.floor(d/60);
var mins = d%60;
if(hrs<10){
if(mins<10){
return "0"+hrs + ":0" + mins;
}
return "0"+ hrs + ":" + mins;
}
return hrs +":"+ mins;
})
.attr("x", function(d, i) { return i * (gridSize * 9)/*adjusts the interval distance with (n - 1) concept*/; })
.attr("y", 0)
.style("text-anchor", "middle")
.attr("transform", "translate(" + 1 + ", -6)")
var heatMap = dataContainer.selectAll("custom.rect")
.data(newSample)
.enter().append("custom")
.attr("x", function(d) {
return (d.timestamp - 1) * (gridSize);
})
.attr("y", function(d) {
//console.log(d.unit);
return (d.unit - 1) * (gridSize);
})
.classed("rect", true)
.attr("class", " rect bordered")
.attr("width", gridSize)
.attr("height", gridSize)
.attr("strokeStyle", "rgba(255,255,255, 0.6)")//to have the middle line or not
.attr("fillStyle", function(d,i){
return colorScale(d.level);
});
drawCanvas();
//Append title to the top
svg.append("text")
.attr("class", "title")
.attr("x", width/2)
.attr("y", -90)
.style("text-anchor", "middle")
.text("Sample Result");
svg.append("text")
.attr("class", "subtitle")
.attr("x", width/2)
.attr("y", -60)
.style("text-anchor", "middle")
.text("HEATMAP");
//Append credit at bottom
svg.append("text")
.attr("class", "credit")
.attr("x", width/2)
.attr("y", gridSize * (units.length+1) + 80)
.style("text-anchor", "middle");
//Extra scale since the color scale is interpolated
var countScale = d3.scaleLinear()
.domain([0, d3.max(newSample, function(d) {return d.level; })])
.range([0, width])
//Calculate the variables for the temp gradient
var numStops = 10;
countRange = countScale.domain();
countRange[2] = countRange[1] - countRange[0];
countPoint = [];
for(var i = 0; i < numStops; i++) {
countPoint.push(i * countRange[2]/(numStops-1) + countRange[0]);
}//for i
//Create the gradient
svg.append("defs")
.append("linearGradient")
.attr("id", "legendLevel")
.attr("x1", "0%").attr("y1", "0%")
.attr("x2", "100%").attr("y2", "0%")
.selectAll("stop")
.data(d3.range(numStops))
.enter().append("stop")
.attr("offset", function(d,i) {
return countScale( countPoint[i] )/width;
})
.attr("stop-color", function(d,i) {
return colorScale( countPoint[i] );
});
var legendWidth = Math.min(width, 400);//the width of the legend
//console.log(width);
//Color Legend container
var legendsvg = svg.append("g")
.attr("class", "legendWrapper")
.attr("transform", "translate(" + (width/2) + "," + (gridSize * 100 + 40) + ")");
//Draw the Rectangle
legendsvg.append("rect")
.attr("class", "legendRect")
.attr("x", -legendWidth/2)
.attr("y", 0)
.attr("width", legendWidth)
.attr("height", 10)
.style("fill", "url(#legendLevel)");
//Append title
legendsvg.append("text")
.attr("class", "legendTitle")
.attr("x", 0)
.attr("y", -10)
.style("text-anchor", "middle")
.text("Level");
//Set scale for x-axis
var xScale = d3.scaleLinear()
.range([-legendWidth/2, legendWidth/2])
.domain([ 0, d3.max(newSample, function(d) { return d.level; })] );
//Define x-axis
var xAxis = d3.axisBottom()
.ticks(5)
.scale(xScale);
//Set up X axis
legendsvg.append("g")
.attr("class", "axis")
.attr("transform", "translate(0," + (10) + ")")
.call(xAxis);
function drawCanvas(){
var elements = dataContainer.selectAll("custom.rect");
elements.each(function(d){
var node = d3.select(this);
context.beginPath();
context.fillStyle = node.attr("fillStyle");
context.rect(node.attr("x"), node.attr("y"), node.attr("width"), node.attr("height"));
context.fill();
context.closePath();
});
}
html { font-size: 100%; }
div#trafficCongestions {
position: relative;
}
canvas {
position: absolute;
top: 170px;
left: 100px;
}
.timeLabel, .dayLabel {
font-size: 1rem;
fill: #AAAAAA;
font-weight: 300;
}
.title {
font-size: 1.8rem;
fill: #4F4F4F;
font-weight: 300;
}
.subtitle {
font-size: 1.0rem;
fill: #AAAAAA;
font-weight: 300;
}
.credit {
font-size: 1.2rem;
fill: #AAAAAA;
font-weight: 400;
}
.axis path, .axis tick, .axis line {
fill: none;
stroke: none;
}
.legendTitle {
font-size: 1.3rem;
fill: #4F4F4F;
font-weight: 300;
}
<script src="https://d3js.org/d3.v4.min.js"></script>
<div id="trafficCongestions" class="trafficCongestions"></div>
Let me know if this makes sense. If not, let's look for other approaches.
Edit as per comments: (visual studio didn't support the CSS styling added by above approach)
Added the style using d3:
canvas.style('position', 'absolute').style('top', margin.top+'px').style('left', margin.left+'px')
And this worked.

In their fitness monitoring app in Apple Watch they are displaying activity charts in the form of colorful concentric circles.
Is there a way to display my D3.js charts on Apple Watch?

You might find this helpful I guess. Apple Watch Activity
HTML
<head>
<meta charset="utf-8">
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet">
<link href='https://fonts.googleapis.com/css?family=Roboto' rel='stylesheet' type='text/css'>
</head>
<script src="https://cdn.rawgit.com/bm-w/d3/master/d3.js"></script>
CSS
html{
height: 100%;
}
body {
min-height: 100%;
background: #000000;
padding:0;
margin:0;
}
.icon{
font-family:fontawesome;
font-weight:bold;
font-size:30px;
}
.goal,.completed{
font-family: 'Roboto','Myriad Set Pro', 'Lucida Grande', 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif;
fill:white;
text-anchor:middle;
}
.goal{
font-size: 30px;
}
.completed{
font-size: 95px;
}
JS
//based on https://bl.ocks.org/mbostock/1096355
//apple design:https://images.apple.com/watch/features/images/fitness_large.jpg
"use strict";
(function(){
var gap = 2;
var ranDataset = function () {
var ran = Math.random();
return [
{index: 0, name: 'move', icon: "\uF105", percentage: ran * 60 + 30},
{index: 1, name: 'exercise', icon: "\uF101", percentage: ran * 60 + 30},
{index: 2, name: 'stand', icon: "\uF106", percentage: ran * 60 + 30}
];
};
var ranDataset2 = function () {
var ran = Math.random();
return [
{index: 0, name: 'move', icon: "\uF105", percentage: ran * 60 + 30}
];
};
var colors = ["#e90b3a", "#a0ff03", "#1ad5de"];
var width = 500,
height = 500,
τ = 2 * Math.PI;
function build(dataset,singleArcView){
var arc = d3.svg.arc()
.startAngle(0)
.endAngle(function (d) {
return d.percentage / 100 * τ;
})
.innerRadius(function (d) {
return 140 - d.index * (40 + gap)
})
.outerRadius(function (d) {
return 180 - d.index * (40 + gap)
})
.cornerRadius(20);//modified d3 api only
var background = d3.svg.arc()
.startAngle(0)
.endAngle(τ)
.innerRadius(function (d, i) {
return 140 - d.index * (40 + gap)
})
.outerRadius(function (d, i) {
return 180 - d.index * (40 + gap)
});
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
//add linear gradient, notice apple uses gradient alone the arc..
//meh, close enough...
var gradient = svg.append("svg:defs")
.append("svg:linearGradient")
.attr("id", "gradient")
.attr("x1", "0%")
.attr("y1", "100%")
.attr("x2", "50%")
.attr("y2", "0%")
.attr("spreadMethod", "pad");
gradient.append("svg:stop")
.attr("offset", "0%")
.attr("stop-color", "#fe08b5")
.attr("stop-opacity", 1);
gradient.append("svg:stop")
.attr("offset", "100%")
.attr("stop-color", "#ff1410")
.attr("stop-opacity", 1);
//add some shadows
var defs = svg.append("defs");
var filter = defs.append("filter")
.attr("id", "dropshadow")
filter.append("feGaussianBlur")
.attr("in", "SourceAlpha")
.attr("stdDeviation", 4)
.attr("result", "blur");
filter.append("feOffset")
.attr("in", "blur")
.attr("dx", 1)
.attr("dy", 1)
.attr("result", "offsetBlur");
var feMerge = filter.append("feMerge");
feMerge.append("feMergeNode")
.attr("in", "offsetBlur");
feMerge.append("feMergeNode")
.attr("in", "SourceGraphic");
var field = svg.selectAll("g")
.data(dataset)
.enter().append("g");
field.append("path").attr("class", "progress").attr("filter", "url(#dropshadow)");
field.append("path").attr("class", "bg")
.style("fill", function (d) {
return colors[d.index];
})
.style("opacity", 0.2)
.attr("d", background);
field.append("text").attr('class','icon');
if(singleArcView){
field.append("text").attr('class','goal').text("OF 600 CALS").attr("transform","translate(0,50)");
field.append("text").attr('class','completed').attr("transform","translate(0,0)");
}
d3.transition().duration(1750).each(update);
function update() {
field = field
.each(function (d) {
this._value = d.percentage;
})
.data(dataset)
.each(function (d) {
d.previousValue = this._value;
});
field.select("path.progress").transition().duration(1750).delay(function (d, i) {
return i * 200
})
.ease("elastic")
.attrTween("d", arcTween)
.style("fill", function (d) {
if(d.index===0){
return "url(#gradient)"
}
return colors[d.index];
});
field.select("text.icon").text(function (d) {
return d.icon;
}).attr("transform", function (d) {
return "translate(10," + -(150 - d.index * (40 + gap)) + ")"
});
field.select("text.completed").text(function (d) {
return Math.round(d.percentage /100 * 600);
});
setTimeout(update, 2000);
}
function arcTween(d) {
var i = d3.interpolateNumber(d.previousValue, d.percentage);
return function (t) {
d.percentage = i(t);
return arc(d);
};
}
}
build(ranDataset);
build(ranDataset2,true);
})()

I am having trouble getting a two-ring donut chart's labels to line up correctly. I think it has something to do with appending the labels to the gs var instead of the path var but if I make that switch, the labels are not visible at all. In the end, I would like each label to be centered on the angle and radius of each slice.
Code is here:
<html>
<body>
<meta charset="utf-8">
<style>
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
margin: auto;
position: relative;
width: 960px;
}
text {
font: 10px sans-serif;
}
form {
position: absolute;
right: 10px;
top: 10px;
}
</style>
<svg class="chart"></svg>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var dataset = {
bip: [.2, .1, .3, .05, .05, .2],
position: [0, 25, 35, 25, 15, 0]
};
var width = 450,
height = 450,
cwidth = 250;
var color = d3.scale.category10();
var pie = d3.layout.pie()
.sort(null)
.startAngle(Math.PI * -.25)
.endAngle(Math.PI * .25)
;
var arc = d3.svg.arc();
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.style("border", "1px solid black")
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height + ")")
;
var gs = svg.selectAll("g")
.data(d3.values(dataset))
.enter()
.append("g");
var path = gs.selectAll("path")
.data(function(d) { return pie(d); })
.enter()
.append("path")
.attr("fill", function(d,i,j) {
return "rgb(" + 255*(1-j) + "," + (166 + d3.round(89*d.value,0))*(1-j) + "," + d3.round(255*d.value,0)*(1-j) + ")" ;
})
.attr("d", function(d, i, j) {
return arc.innerRadius(cwidth*j).outerRadius(cwidth-5+50*j) (d);
})
.style('stroke', 'white')
.style('stroke-width', 5)
;
//Labels
gs.append("svg:text")
.attr("transform", function(d, i, j) {
d.startAngle = (Math.PI * -.75 + Math.PI*i/6);
d.endAngle = (Math.PI * .25 + Math.PI*i/6);
d.innerRadius = cwidth*j;
d.outerRadius = cwidth-5+50*j;
return "translate(" + arc.centroid(d) + ")";
})
.attr("text-anchor", "middle")
.style("fill", "white")
.style("font", "bold 12px Arial")
.text(function(d, i, j) { return d; });
</script>
</body>
</html>
Example is here:
http://jsfiddle.net/sgrossman/kzh7c8mn/
Appreciate the help.

I think that you are right about the problem being attaching to the gs vs. the path var.
I have a fiddle here that is working a bit like you want. It creates text and textPaths per arc element and links them via an ID. Centering is not perfect but could be tuned through trial and error.
//Add an id to the path
.attr("id", function(d, i, j){return 'path_' + i + '_'+ j;})
Add a svg:text and textPath per data point:
gs.selectAll("g").data(function (d, i, j) {
return d;
})
.enter().append('svg:text')
.attr("dx", function(d,i,j){
if(j==1) {return (d * 2) + 8;}
else {return (d * 250) - 15;}
})
.attr("dy", 25)
.append('textPath')
.attr("stroke","white")
//Link via xlink:href
.attr("xlink:href",function(d,i,j){
return '#path_' + i + '_' + j;
})
.text(function (d, i, j) {
return d;
});
JSFiddle