Building and Using Tools to See.
UVA Architecture + Data Science. IT Director. Instructor.
<svg width="200" height="200" viewBox="0 0 200 200">
<style>
.radCircle {fill: none; stroke: #ddd;}
.radLine {stroke: black; stroke-witdh: 1px;}
</style>
</svg>
center = ({"x":100,"y":100})
innerRadius = 50
data = ([
{datetime:"2023-03-11 12:00:00",value: 10},
{datetime:"2023-12-24 22:11:00",value: 5.6},
{datetime:"2023-12-24 16:06:00",value: 2.3},
{datetime:"2023-12-26 20:32:00",value: 8.3},
{datetime:"2023-03-12 17:10:00",value: 9.2},
{datetime:"2023-03-15 19:33:00",value: 1.4}
])
radChart = {
// group to hold the entire set, and then move it to the center location (see above)
let radChart = d3.select(radialSVG).selectAll("radGroup")
.data([1])
.join("g")
.classed("radGroup",true)
.attr("transform","translate(" + center.x + "," + center.y + ")")
// add a reference circle
radChart.append("circle")
.attr("r",innerRadius)
.classed("radCircle",true);
// the lines, calculated using polar coordinates
let radLines = radChart.selectAll("radLines")
.data(data)
.join("line")
.attr("x1", d => polarXY(innerRadius, angleDeg_HMS(d.datetime)).x)
.attr("y1", d => polarXY(innerRadius, angleDeg_HMS(d.datetime)).y)
.attr("x2", d => polarXY(innerRadius+scaleRadius(d.value), angleDeg_HMS(d.datetime)).x)
.attr("y2", d => polarXY(innerRadius+scaleRadius(d.value) ,angleDeg_HMS(d.datetime)).y)
.classed("radLine",true);
return radChart;
}
scaleRadius = d3.scaleLinear().domain([0,10]).range([0,50])
angleDeg_HMS = (datetimeString) => {
let HMS = datetimeString.split(" ")[1];
let hour = Number(HMS.split(":")[0]);
let minute = Number(HMS.split(":")[1]);
let second = Number(HMS.split(":")[2]);
let clockAngleDeg = 90 - (hour*30 + minute*0.5 + second*0.00833); // 12 hour clock format, amend for 24-hour or calendar year
return clockAngleDeg;
}
angleDeg_HMS(data[0].datetime) // testing
polarXY(1,angleDeg_HMS(data[0].datetime)) // testing
scaleTime = d3.scaleTime().domain([new Date("2023-01-01 00:00:00"),new Date("2023-01-01 12:00:00")]).range([0,360])
scaleTime(new Date("2023-03-12 12:00:00"))/360 // should be an even multiple of 360 degrees
scaleTime(new Date("2023-03-11 12:00:00"))/360
polarXY = (magnitude,angle) => {
magnitude = +magnitude;
angle = +angle;
let x = magnitude * Math.cos(radiansFromDeg(angle));
let y = - magnitude * Math.sin(radiansFromDeg(angle)); //negative because 0,0 is at the top
return {"x":x, "y":y};
}
radiansFromDeg = (deg) => {
deg = +deg;
return deg * Math.PI / 180;
}
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
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