Created
July 19, 2017 16:41
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D3 V4 Line chart with draggable circles
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| <!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> |
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