mlu @aws
circles = d3.range(20).map(i => ({
x: Math.random() * (width - radius * 2) + radius,
y: Math.random() * (height - radius * 2) + radius,
index: i
}));
chart = {
const svg = d3.create("svg")
.attr("viewBox", [0, 0, width, height])
.attr("stroke-width", 2)
.attr('id', 'chart')
svg.selectAll("circle.point")
.data(circles)
.join("circle")
.attr('class', 'point')
.attr("cx", d => d.x)
.attr("cy", d => d.y)
.attr("r", radius)
.attr("fill", d => d3.schemeCategory10[d.index % 10])
const line = svg.append('line')
.attr('x1', width / 2)
.attr('x2', width / 2)
.attr('y1', 0)
.attr('y1', height)
.attr('fill', 'none')
.attr('stroke', 'black')
.attr('stroke-width', 15)
.call(drag)
.on("click", clicked);
function clicked(event, d) {
if (event.defaultPrevented) return; // dragged
// d3.select(this).transition()
// .attr("stroke", "skyblue")
// .attr("stroke-width", 40)
// .transition()
// .attr("stroke", "black")
// .attr("stroke-width", 15)
}
return svg.node();
}
drag = {
function dragstarted() {
// d3.select(this).attr("stroke", "red").attr('stroke-width', 20);
}
function dragged(event, d) {
d3.select(this).raise().attr("x1", event.x).attr("x2",event.x)//.attr("y1", d.y = event.y);
}
function dragended(event, d) {
d3.select(this).attr("stroke", "black").attr('stroke-width', 15);
const bndryXPos = event.x;
console.log("x pos", bndryXPos);
// bind circle's position to data
d3.select('#chart')
.selectAll("circle.point")
.join(circles)
.each(function (d) {
d.group = d.x <= bndryXPos ? 0 : 1;
});
// recolor circles according to rel position to bndry
d3.select('#chart')
.selectAll('circle.point')
.transition()
.attr('fill', d => d.group === 0 ? 'red' : 'blue')
}
return d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended);
}
height = 600
radius = 20
d3 = require("d3@6")
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
