Public
Edited
Nov 16, 2023
horizon = 100
drag = circles => {
// Choose the circle that is closest to the pointer for dragging.
function dragsubject(event) {
let subject = null;
let distance = maxDistance;
for (const c of circles) {
let d = Math.hypot(event.x - c.x, event.y - c.y);
if (d < distance) {
distance = d;
subject = c;
}
}
return subject;
}
// When starting a drag gesture, move the subject to the top and mark it as active.
function dragstarted(event) {
//circles.splice(circles.indexOf(event.subject), 1);
//circles.push(event.subject);
event.subject.active = true;
}
// When dragging, update the subject’s position.
function dragged(event) {
const pos = event.subject.proj(event.x, event.y, circles);
event.subject.x = pos.x;
event.subject.y = pos.y;
if(event.subject.mag != undefined) {
event.subject.m = event.subject.mag(pos.x, pos.y, circles);
}
if(event.subject.update != undefined) {
event.subject.update(pos.x, pos.y, circles);
}
for(const circle of circles) {
if(circle == event.subject.circle) continue;
if(circle.m != undefined && circle.proj_mag != undefined) {
circle.x = circle.proj_mag(circle.m, circles).x;
circle.y = circle.proj_mag(circle.m, circles).y;
}
}
}
// When ending a drag gesture, mark the subject as inactive again.
function dragended(event) {
event.subject.active = false;
}
return d3.drag()
.subject(dragsubject)
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended);
}
height = 500
radius = 5
maxDistance = 500
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.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.