Scatterplot Overplotting / John Alexis Guerra Gómez

John Alexis Guerra Gómez

I love to build dataviz for insight discovery. I also love to put technology to the service of humanity

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Published

Edited

Jul 30, 2020

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6 stars

D3 Tutorials

d3.geoPath + Canvas + Zoom + Panning TopoJSON Simplifier and Filter attributes How to add a tooltip in D3 d3.stack with d3.group

Scatterplot Overplotting

Treemap from table d3.stack with d3.nest D3 data binding v3 to v5 D3 Network Visualization Playground Reusable charts d3@4 Intro to D3 Marks and Channels in D3

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Visualization Concepts

jitter= () => Math.random()*jitterValue

chart = {

const svg = d3.create("svg")

.attr("viewBox", [0, 0, iwidth, height]);

svg.append("g")

.call(xAxis);

svg.append("g")

.call(yAxis);

svg.append("g")

.attr("stroke-width", 1.5)

.attr("font-family", "sans-serif")

.attr("font-size", 10)

.selectAll("g")

.data(data)

.join("g")

.attr("transform", d => `translate(${x(d.x)+jitter()},${y(d.y)+jitter()})`)

.call(g => g.append("circle")

.attr("stroke", "steelblue")

.attr("fill", "steelblue")

.style("opacity", "0.3")

.attr("r", r))

.call(g => g.append("text")

.attr("dy", "0.35em")

.attr("x", 7)

.text(d => d.name));

return svg.node();

}

md`## Option 2. Use the force

You can create a forceSimulation that tries to send the circles to their desired locations, but then avoid collisions between them`

chartForce = {

const svg = d3.create("svg")

.attr("viewBox", [0, 0, iwidth, height]);

svg.append("g")

.call(xAxis);

svg.append("g")

.call(yAxis);

// d3.forceSimulation uses d.x and d.y, so we need to reformat the data

const dataFixed = data.map(d => ({px:d.x, py:d.y}));

console.log("before", dataFixed[0]);

const simulation = d3.forceSimulation(dataFixed)

.force("x", d3.forceX(d=> x(d.px)))

.force("y", d3.forceY(d=> y(d.py)))

.force("collide", d3.forceCollide(r + collisionR).iterations(4))

// Run the simulation for 100 steps

for(let i=0; i<100; i++)

simulation.tick();

simulation.stop();

console.log(dataFixed);

svg.append("g")

.attr("stroke-width", 1.5)

.attr("font-family", "sans-serif")

.attr("font-size", 10)

.selectAll("g")

.data(dataFixed)

.join("g")

.attr("transform", d => `translate(${d.x},${d.y})`)

.call(g => g.append("circle")

.attr("stroke", "steelblue")

.attr("fill", "steelblue")

.style("opacity", "0.3")

.attr("r", r))

.call(g => g.append("text")

.attr("dy", "0.35em")

.attr("x", 7)

.text(d => d.name));

return svg.node();

}

iwidth = width/2

height = iwidth*.7

margin = ({top: 20, right: 30, bottom: 30, left: 40})

x = d3.scaleLinear()

.domain([0, d3.max(data, d => d.x)]).nice()

.range([margin.left, iwidth - margin.right])

y = d3.scaleLinear()

.domain([0, d3.max(data, d => d.y)]).nice()

.range([height - margin.bottom, margin.top])

xAxis = g => g

.attr("transform", `translate(0,${height - margin.bottom})`)

.call(d3.axisBottom(x))

.call(g => g.select(".domain").remove())

.call(g => g.append("text")

.attr("x", width - margin.right)

.attr("y", -4)

.attr("fill", "#000")

.attr("font-weight", "bold")

.attr("text-anchor", "end")

.attr("font-size", "12pt")

.text(data.x))

yAxis = g => g

.attr("transform", `translate(${margin.left},0)`)

.call(d3.axisLeft(y))

.call(g => g.select(".domain").remove())

.call(g => g.select(".tick:last-of-type text").clone()

.attr("x", 4)

.attr("text-anchor", "start")

.attr("font-weight", "bold")

.attr("font-size", "12pt")

.text(data.y))

data = d3.range(250).map(d => ({

x: Math.floor(Math.random()*5)+1,

y: Math.floor(Math.random()*5)+1,

}))

d3 = require("d3@5")

import {slider} from "@jashkenas/inputs"

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