denisemauldin/index.html

## index.html
<!DOCTYPE html>
<!-- https://stackoverflow.com/questions/42720488/d3-v4-drag-line-chart-with-x-and-y-axes -->
<!-- Thanks to Mark - https://stackoverflow.com/users/16363/mark -->
<svg width="500" height="350"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

var svg = d3.select("svg"),
    margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom;


let points = d3.range(1, 10).map(function(i) {
    return [i * width / 10, 50 + Math.random() * (height - 100)];
});
var x = d3.scaleLinear()
    .rangeRound([0, width]);

var y = d3.scaleLinear()
    .rangeRound([height, 0]);

var xAxis = d3.axisBottom(x),
    yAxis = d3.axisLeft(y);

var line = d3.line()
    .x(function(d) { return x(d[0]); })
    .y(function(d) { return y(d[1]); });

let drag = d3.drag()
        .on('start', dragstarted)
        .on('drag', dragged)
        .on('end', dragended);

svg.append('rect')
    .attr('class', 'zoom')
    .attr('cursor', 'move')
    .attr('fill', 'none')
    .attr('pointer-events', 'all')
    .attr('width', width)
    .attr('height', height)
    .attr('transform', 'translate(' + margin.left + ',' + margin.top + ')')

 var focus = svg.append("g")
                .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

x.domain(d3.extent(points, function(d) { return d[0]; }));
y.domain(d3.extent(points, function(d) { return d[1]; }));

focus.append("path")
    .datum(points)
    .attr("fill", "none")
    .attr("stroke", "steelblue")
    .attr("stroke-linejoin", "round")
    .attr("stroke-linecap", "round")
    .attr("stroke-width", 1.5)
    .attr("d", line);

focus.selectAll('circle')
    .data(points)
    .enter()
    .append('circle')
    .attr('r', 5.0)
    .attr('cx', function(d) { return x(d[0]);  })
    .attr('cy', function(d) { return y(d[1]); })
    .style('cursor', 'pointer')
    .style('fill', 'steelblue');

focus.selectAll('circle')
        .call(drag);

focus.append('g')
    .attr('class', 'axis axis--x')
    .attr('transform', 'translate(0,' + height + ')')
    .call(xAxis);

focus.append('g')
    .attr('class', 'axis axis--y')
    .call(yAxis);

function dragstarted(d) {
    d3.select(this).raise().classed('active', true);
}

function dragged(d) {
    d[0] = x.invert(d3.event.x);
    d[1] = y.invert(d3.event.y);
    d3.select(this)
        .attr('cx', x(d[0]))
        .attr('cy', y(d[1]))
    focus.select('path').attr('d', line);
}

function dragended(d) {
    d3.select(this).classed('active', false);
}

</script>
	<!DOCTYPE html>
	<!-- https://stackoverflow.com/questions/42720488/d3-v4-drag-line-chart-with-x-and-y-axes -->
	<!-- Thanks to Mark - https://stackoverflow.com/users/16363/mark -->
	<svg width="500" height="350"></svg>
	<script src="https://d3js.org/d3.v4.min.js"></script>
	<script>

	var svg = d3.select("svg"),
	margin = {top: 20, right: 20, bottom: 30, left: 50},
	width = +svg.attr("width") - margin.left - margin.right,
	height = +svg.attr("height") - margin.top - margin.bottom;


	let points = d3.range(1, 10).map(function(i) {
	return [i * width / 10, 50 + Math.random() * (height - 100)];
	});
	var x = d3.scaleLinear()
	.rangeRound([0, width]);

	var y = d3.scaleLinear()
	.rangeRound([height, 0]);

	var xAxis = d3.axisBottom(x),
	yAxis = d3.axisLeft(y);

	var line = d3.line()
	.x(function(d) { return x(d[0]); })
	.y(function(d) { return y(d[1]); });

	let drag = d3.drag()
	.on('start', dragstarted)
	.on('drag', dragged)
	.on('end', dragended);

	svg.append('rect')
	.attr('class', 'zoom')
	.attr('cursor', 'move')
	.attr('fill', 'none')
	.attr('pointer-events', 'all')
	.attr('width', width)
	.attr('height', height)
	.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')')

	var focus = svg.append("g")
	.attr("transform", "translate(" + margin.left + "," + margin.top + ")");

	x.domain(d3.extent(points, function(d) { return d[0]; }));
	y.domain(d3.extent(points, function(d) { return d[1]; }));

	focus.append("path")
	.datum(points)
	.attr("fill", "none")
	.attr("stroke", "steelblue")
	.attr("stroke-linejoin", "round")
	.attr("stroke-linecap", "round")
	.attr("stroke-width", 1.5)
	.attr("d", line);

	focus.selectAll('circle')
	.data(points)
	.enter()
	.append('circle')
	.attr('r', 5.0)
	.attr('cx', function(d) { return x(d[0]); })
	.attr('cy', function(d) { return y(d[1]); })
	.style('cursor', 'pointer')
	.style('fill', 'steelblue');

	focus.selectAll('circle')
	.call(drag);

	focus.append('g')
	.attr('class', 'axis axis--x')
	.attr('transform', 'translate(0,' + height + ')')
	.call(xAxis);

	focus.append('g')
	.attr('class', 'axis axis--y')
	.call(yAxis);

	function dragstarted(d) {
	d3.select(this).raise().classed('active', true);
	}

	function dragged(d) {
	d[0] = x.invert(d3.event.x);
	d[1] = y.invert(d3.event.y);
	d3.select(this)
	.attr('cx', x(d[0]))
	.attr('cy', y(d[1]))
	focus.select('path').attr('d', line);
	}

	function dragended(d) {
	d3.select(this).classed('active', false);
	}

	</script>