The avatar for @spattana
Sumant Pattanaik
Published
D3 Class
Edited
Apr 1, 2021
D3 Class
Useful Javascript Array functions.SVG cheat sheetD3: IntroducingScales and AxesUseful D3 Functions for Data handlingWeek 2, TuesdayclipPath and textPathUS Baby NamesData Fetch and Meta dataWeek 3Week 4: Getting Started With InteractionWeb Scraping Table data from HTML file.Fetch Covid-19 dataWeek 5Week 8: HierarchiesCircle PackingTreemapGraph LayoutWeek 6Week 7: TuesdayDrawing Axis in d3 CanvasInteraction in d3 Canvas based Scatter PlotsGeoVisualization using D3TopoJSON and GeoVisualizationMore d3 Scale functions and InterpolationsColor from Wavelength, Correlated Temperature and HTML color pickerHSV and HSL Color Models
More on d3 join()
Final Projects
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{
const [svgNode, svg] = getSVG(width, height, margin, true);

const circleGroup = svg
.append("g")
.style('fill', "steelblue")
.style('opacity', 0.5)
.style('stroke', "black");

const drawCircles = () => {
const t = circleGroup.transition().duration(750);
circleGroup
.selectAll("circle")
.data(getRandomizedData(), d => d.id)
.join(
enter =>
enter
.append("circle")
.attr("r", rad)
.attr("cx", d => d.x)
.attr("cy", d => d.y)
.style("fill", "black"),
update => {
update.call(selection =>
selection
.transition(t)
.attr("cx", d => d.x)
.attr("cy", d => d.y)
.style("fill", d => colorScale(d.id))
);
},
exit =>
exit.style("fill", "none").call(selection =>
selection
.transition(t)
.attr("cy", height)
.remove()
)
);
};
drawCircles(getRandomizedData());

d3.select("#update_3").on("click", drawCircles);
return svgNode;
}
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mutable feedback = []
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width = 600
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height = 300
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margin = 20
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rad = 10
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W = width - 2 * margin
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H = height - 2 * margin
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chars = "abcdefghij".split("");
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colorScale = d3
.scaleOrdinal()
.domain(chars)
.range(d3.schemeCategory10)
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getRandomizedData = () => {
const N = Math.ceil(Math.random() * 10);
const step = W / N;
const randomChars = d3.shuffle(chars.map(d => d)); //.sort(d3.ascending);
const data = d3.range(N).map((d, i) => ({
x: (i * W) / N,
y: Math.random() * H,
id: randomChars[i]
}));
mutable feedback = data.map(d => d.id);
return data;
}
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md `### External Libraries and Imports`
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import {getSVG} from "@spattana/topojson-and-geovisualization"
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import {Button, Checkbox, Toggle, Radio, Range, Select, Text, Textarea, Search, Table} from "@observablehq/inputs"
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import {columns} from "@bcardiff/observable-columns"
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d3 = require("d3@6")
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