|
<!DOCTYPE html> |
|
<head> |
|
<meta charset="utf-8"> |
|
<script src="https://d3js.org/d3.v4.min.js"></script> |
|
<style> |
|
.dot { |
|
fill: white; |
|
stroke: black; |
|
} |
|
|
|
.active { |
|
stroke: red; |
|
} |
|
|
|
body { |
|
font-family: monospace; |
|
} |
|
|
|
a { |
|
position: absolute; |
|
top: 20px; |
|
left: 20px; |
|
} |
|
</style> |
|
</head> |
|
|
|
<body> |
|
<a href="#" class="reset-btn">Reset</a> |
|
<script> |
|
var margin = {top: 0, right: 0, bottom: 0, left: 0}; |
|
|
|
var width = 960 - margin.left - margin.right, |
|
height = 500 - margin.top - margin.bottom; |
|
|
|
var svg = d3.select("body").append("svg") |
|
.attr("width", width + margin.left + margin.right) |
|
.attr("height", height + margin.top + margin.bottom) |
|
.append("g") |
|
.attr("transform", "translate(" + margin.left + "," + margin.top + ")"); |
|
|
|
var radius = 20, |
|
strokewidth = 5; |
|
|
|
var te = d3.easeCubic; |
|
|
|
var dots = [ |
|
{ |
|
type: "min", |
|
colour: "white", |
|
x: width / 4, |
|
y: height / 2 |
|
}, |
|
{ |
|
type: "median", |
|
colour: "grey", |
|
x: width / 2, |
|
y: height / 2 |
|
}, |
|
{ |
|
type: "max", |
|
colour: "black", |
|
x: width * 3 / 4, |
|
y: height / 2 |
|
}]; |
|
|
|
var dotsoriginal = JSON.parse(JSON.stringify(dots)); |
|
|
|
var dragbehaviour = d3.drag() |
|
.on("start", dragstarted) |
|
.on("drag", dragged) |
|
.on("end", dragended); |
|
|
|
var labels = svg.selectAll("text") |
|
.data(dots) |
|
.enter().append("text") |
|
.attr("x", function(d) { return d.x }) |
|
.attr("y", function(d) { |
|
return height / 2 + (d.type == "min" || d.type == "max" ? 60 : -50) |
|
}) |
|
.attr("text-anchor", "middle") |
|
.text(function(d) { return "(" + d.x + ", " + d.y + ")" }); |
|
|
|
var lineGenerator = d3.line() |
|
.x(function(d) { return d.x + (d.type == "min" ? radius : -radius)}) |
|
.y(function(d) { return d.y }); |
|
|
|
var pathString = function() { return lineGenerator(dots) }; |
|
|
|
var line = svg.append("path") |
|
.attr("class", "line") |
|
.attr("d", pathString) |
|
.attr("stroke", "black") |
|
.style("stroke-width", strokewidth); |
|
|
|
var circles = svg.selectAll("circle") |
|
.data(dots) |
|
.enter().append("circle") |
|
.attr("class", "dot") |
|
.attr("cx", function(d) { return d.x; }) |
|
.attr("cy", function(d) { return d.y; }) |
|
.attr("r", radius) |
|
.style("fill", function(d) { return d.colour }) |
|
.style("stroke-width", strokewidth) |
|
.call(dragbehaviour); |
|
|
|
function dragstarted(d) { |
|
d3.select(this) |
|
.classed("active", true); |
|
} |
|
|
|
function dragged(d) { |
|
var minX, maxX; |
|
|
|
if (d.type == "min") { |
|
minX = radius + strokewidth; |
|
maxX = dots[1].x - (radius * 2) - strokewidth; |
|
} else if (d.type == "median") { |
|
minX = dots[0].x + (radius * 2) + strokewidth; |
|
maxX = dots[2].x - (radius * 2) - strokewidth; |
|
} else { |
|
minX = dots[1].x + (radius * 2) + strokewidth; |
|
maxX = width - radius - strokewidth; |
|
} |
|
|
|
d3.select(this) |
|
.attr("cx", d.x = Math.max(minX, Math.min(maxX, d3.event.x))); |
|
|
|
labels |
|
.attr("x", function(d) { return d.x }) |
|
.text(function(d) { return "(" + d.x + ", " + d.y + ")" }); |
|
|
|
line.attr("d", pathString); |
|
} |
|
|
|
function dragended(d) { |
|
d3.select(this) |
|
.classed("active", false); |
|
} |
|
|
|
d3.select(".reset-btn") |
|
.on("click", function(d) { |
|
d3.event.preventDefault(); |
|
dots = dotsoriginal; |
|
dotsoriginal = JSON.parse(JSON.stringify(dots)); |
|
|
|
line.transition() |
|
.duration(500) |
|
.ease(te) |
|
.attr("d", pathString); |
|
|
|
circles.data(dots).transition() |
|
.duration(500) |
|
.ease(te) |
|
.attr("cx", function(d) { return d.x; }); |
|
|
|
labels.data(dots).transition() |
|
.duration(500) |
|
.ease(te) |
|
.attr("x", function(d) { return d.x; }) |
|
.text(function(d) { return "(" + d.x + ", " + d.y + ")" }); |
|
}); |
|
|
|
</script> |
|
</body> |