Random walks p3 / Bill Mill

Published

Edited

Apr 21, 2021

md`# Random walks p3`

chart = {

const svg = d3.create("svg")

.attr("viewBox", [0, 0, 800, 800]);

let x=400,y=400,length=10,points=[JSON.stringify([400,400])];

svg.append("circle").attr("cx", x).attr("cy", y).attr("r", length * 0.75).attr("stroke", "blue").attr("fill", "none");

for (var i=0; i < 50; i++) {

let vord = Math.random() < 0.5,

dist = length * (Math.random() < 0.5 ? 1 : -1),

xp = vord ? x + dist : x,

yp = vord ? y : y + dist;

if (points.indexOf(JSON.stringify([xp,yp])) != -1) {

break

} else {

points.push(JSON.stringify([xp,yp]));

}

svg.append("line").attr("x1", x).attr("y1", y).attr("x2", xp).attr("y2", yp).attr("stroke", "black");

x = xp;

y = yp;

}

svg.append("circle").attr("cx", x).attr("cy", y).attr("r", length * 0.75).attr("stroke", "red").attr("fill", "none");

return svg.node();

}

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