<!DOCTYPE html>
<meta charset="utf-8">
<style>
.active {
stroke: #000;
stroke-width: 2px;
}
</style>
<svg width="960" height="500"></svg>
<script src="//d3js.org/d3.v4.min.js"></script>
<script>
var svg = d3.select("svg"),
width = +svg.attr("width"),
height = +svg.attr("height"),
radius = 32;
var data = [{
x: 100,
y: 200
},
{
x: 200,
y: 300
},
{
x: 300,
y: 200
},
{
x: 400,
y: 300
}
];
var xScale = d3.scaleLinear()
.domain([0, d3.max(data, function(d) {
return d.x_pos
})]).range([0, width]);
svg.selectAll("circle")
.data(data)
.enter().append("circle")
.attr("cx", function(d) {
return d.x;
})
.attr("cy", function(d) {
return d.y;
})
.attr("r", radius)
.style("fill", "lightblue")
.attr('id', function(d, i) {
return 'rect_' + i;
})
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended))
.on("click", removeElement);
svg.on("click", function() {
var coords = d3.mouse(this);
var newData = {
x: d3.event.x,
y: d3.event.y
};
data.push(newData);
svg.selectAll("circle") // For new circle, go through the update process
.data(data)
.enter()
.append("circle")
.attr("cx", function(d) {
return d.x;
})
.attr("cy", function(d) {
return d.y;
})
.attr("r", radius)
.style("fill", "red")
.attr('id', function(d, i) {
return 'circle_' + i;
})
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended))
.on("click", removeElement);
})
function dragstarted(d) {
d3.select(this).raise().classed("active", true);
}
function dragged(d) {
d3.select(this)
.attr("cx", d.x = d3.event.x)
.attr("cy", d.y = d3.event.y);
}
function dragended(d) {
d3.select(this)
.classed("active", false);
}
function removeElement(d) {
// need to remove this object from data
d3.select(this)
.remove();
}
</script>
